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339 preguntasB&P §7159(e) requires the cancellation notice to be accompanied by a completed form IN DUPLICATE, captioned 'Notice of Cancellation', on a separate and detachable page, in the same language as the sales presentation — two copies so the buyer can send one to the contractor and keep the other as proof of the date sent. Civil Code §1689.7 imposes the same duplicate requirement on home solicitation contracts generally. (b) leaves the buyer nothing to send; a notice printed only on the contract face defeats the mechanism. (a) and (c) import formalities from land records — a cancellation notice is delivered to the contractor, not notarized or recorded. If the form is missing, §7159(a)(6) lets the buyer complain to CSLB, and the cancellation period never starts to run.
Bus. & Prof. Code §7159(e), §7159(a)(6); Civil Code §1689.7Ten percent of $3,000 is $300, which is less than the $1,000 cap. Because the limit is the lesser of the two, the maximum down payment is $300.
B&P §7159(d)B&P §7159(d) requires the home improvement contract, and any change to it, to be in writing and signed before the work it covers begins, and §7159(e) puts the three-business-day cancellation notice next to the buyer's signature. The protection is sequencing: the buyer sees the price, the payment schedule, the completion date and the right to cancel while walking away still costs nothing. (a) inverts it — a compliant contract waives nothing, and B&P §7160 makes misrepresentation used to obtain a home improvement contract a separate offense. (c) confuses a consumer-protection formality with price regulation; California does not set contract prices. (d) confuses the contract with the permit; the building department's requirements are untouched by who signed what.
Bus. & Prof. Code §7159(d), §7159(e); §7160B&P §7159.10(a) makes this a checklist, not a judgment call: the service and repair form is available only when the contract amount is $750 or less, the buyer initiated contact to request the work, the contractor sells nothing beyond what is reasonably necessary for the particular problem that prompted the call, and no payment is due or accepted until the work is completed. Fail any one and §7159.10(b) applies the full §7159 home improvement requirements regardless of price, cancellation rights included. (a) drops every condition. (b) inverts the ceiling into a floor — $2,000 is above the limit, not inside it. (c) borrows the senior-citizen rule, which lengthens the cancellation period under Civil Code §1689.6 but says nothing about which contract form applies.
Bus. & Prof. Code §7159.10(a)-(b)B&P §7159(d) requires the contract to be legible and to clearly describe any other document to be incorporated into it, under the heading 'List of Documents to be Incorporated into the Contract'; §7159(d)(4) entitles the buyer to a completely filled in copy, signed by both parties, before any work may be started. A document the buyer has never seen cannot form part of what the buyer agreed to. §7164(c) says the same for a contract to build a single-family dwelling. (c) is the everyday violation — plans and specifications riding in the contractor's truck, referenced but never handed over. (a) states it as deliberate policy, which only compounds it. (b) confuses the contract with a recorded instrument; nothing about a home improvement contract is recorded, and CSLB neither reviews nor files it.
Bus. & Prof. Code §7159(d), §7159(d)(4); cf. §7164(c)An estimate is a price opinion: it binds nobody and creates no rights. A home improvement contract is a regulated instrument. B&P §7159(d) requires the 'Home Improvement' heading in 10-point boldface, the contract amount in dollars and cents, a description of the project and the significant materials, the 'Approximate Start Date' and the estimated completion date (§7159(d)(10)-(11)), the payment schedule, and both signatures before work begins; §7159(e) adds the cancellation notice and form, the Mechanics Lien Warning, the CSLB notice and the insurance notices. Handing the owner an estimate and starting work leaves the contractor with no enforceable change-order rights and exposure to discipline under §7159(a)(5). (b), (c) and (d) each invent a formality the statute does not impose — nothing in §7159 concerns colour, tax records or notarization.
Bus. & Prof. Code §7159(d)(10)-(11), (e), §7159(a)(5)Civil Code §1689.6(a) starts the clock on the buyer's receipt of an agreement 'which complies with Section 1689.7' — and §1689.7 is the section requiring the cancellation disclosure and the detachable Notice of Cancellation in duplicate, in the language of the sales presentation. A contract without them never starts the period, so the right to cancel stays open. (a) runs the clock off the signature regardless of the notice, which is exactly the shortcut the statute forecloses. (b) treats the signature as a waiver; these terms are mandatory under B&P §7159(d) and (e), and a buyer cannot waive them by signing a non-compliant form. (d) invents a 24-hour period that exists nowhere in California law.
Civil Code §1689.6(a), §1689.7; Bus. & Prof. Code §7159(e)B&P §7159.5(a)(5) forbids the contractor, downpayment aside, to request or accept any payment exceeding the value of the work performed or the material delivered — and here nothing has been performed and nothing delivered, so the permissible figure is zero. The $1,000 already taken was itself the maximum: §7159.5(a)(3) caps the downpayment at $1,000 or 10 percent of the contract amount, whichever is LESS, and on a $60,000 job that is $1,000, not $6,000. (a) treats the modest downpayment as head-room for a bigger second bite; the two rules are independent, and satisfying one does not relax the other. (b) and (c) treat the owner's means and the form of payment as though they mattered; neither appears in the statute. The lawful route to money up front is the §7159.5(a)(8) bond or registrar-approved joint control.
Bus. & Prof. Code §7159.5(a)(3), (5), (8)A $2,500 solicited patio cover exceeds the $750 service and repair limit and was not buyer-initiated, so it requires a full home improvement contract under §7159.
B&P §7159B&P §7159(d)(8) requires the contract to carry the heading 'Downpayment', a space where the actual downpayment appears, and this statement in at least 12-point boldface type: 'THE DOWNPAYMENT MAY NOT EXCEED $1,000 OR 10 PERCENT OF THE CONTRACT PRICE, WHICHEVER IS LESS.' Printing the figure beside the rule is what lets a buyer do the arithmetic on the spot — on a $60,000 job the ceiling is $1,000, not $6,000, because §7159.5(a)(3) takes the LESSER of the two. (b) is the opposite of the purpose; disclosure is how over-collection gets caught. (a) and (c) are invented — no lender sets the contract price, and CSLB's fees have nothing to do with the contract's terms. Note the exception: §7159.5(a)(8) lifts the cap for a contractor who furnishes a performance and payment bond or a registrar-approved joint control.
Bus. & Prof. Code §7159(d)(8); §7159.5(a)(3), (8)B&P §7159.10 requires that no payment be collected on a service and repair contract until the work is complete, so the plumber bills after finishing the repair.
B&P §7159.10B&P §7153(a) makes it a MISDEMEANOR to engage in the occupation of home improvement salesperson without a current and valid registration at the time of the sales transaction, and lets the registrar cite the salesperson under §7028.7. The contractor is not a bystander: §7154 requires him to notify the registrar in writing of the salesperson's employment before that person begins work, and §7155.5 makes the salesperson's violations cause for disciplinary action against the contractor 'whether or not the contractor had knowledge of or participated in' them. The paperwork gives it away too — §7159(d)(2) requires the salesperson's name and registration number in the contract itself. (a) invents a dollar threshold; the duty turns on the activity, not the price. (c) invents a family exemption. (d) treats the contractor's licence as covering the salesperson, which is precisely what a separate registration scheme exists to prevent.
Bus. & Prof. Code §7153, §7154, §7155.5; §7159(d)(2)Civil Code §1632 requires a person who negotiates a covered contract primarily in Spanish, Chinese, Tagalog, Vietnamese or Korean to deliver, before the buyer signs, a translation of the contract in that language. B&P §7159(e) carries the same principle into the Home Improvement article at the sharpest point: the Notice of Cancellation must be written 'in the same language, e.g., Spanish, as used in the contract', and the accompanying notice must be in the language principally used in the oral sales presentation. §7159.10(d)(1) says the same for a service and repair contract. (a) makes a consumer protection turn on the contractor's guess about the buyer's fluency, which is what a bright-line rule exists to avoid. (c) translates the label and leaves the obligations in a language the buyer never negotiated in. (d) is simply wrong on the law.
Civil Code §1632; Bus. & Prof. Code §7159(e), §7159.10(d)(1)Ten percent of $5,000 is $500, which is less than the $1,000 cap, so the maximum lawful down payment is $500 even though the owner offers to prepay in full.
B&P §7159(d)B&P §7161 lists departing from or disregarding the plans and specifications without the owner's written consent among prohibited acts and causes for disciplinary action.
B&P §7161Full prepayment before work begins is exactly what §7159 forbids; the statute limits down payments and ties progress payments to work performed while requiring the written contract and notices.
B&P §7159A purported acceptance that changes a material term of the offer is not an acceptance at all; it is a counteroffer that terminates the original offer. Because the contractor changed the price from $8,000 to $9,500, the parties have not reached mutual assent, and no contract is formed until someone accepts the new $9,500 terms. Price is a material term, so courts do not split the difference, and the original $8,000 offer is dead once rejected by the counteroffer.
The essential elements of a contract are competent (capable) parties, mutual consent, a lawful object, and consideration. Notarization is not an essential element; most contracts are fully enforceable without a notary. A notary merely verifies identity for certain recorded documents. Many valid contracts, including most construction contracts, are enforceable when signed without any notarization.
Civil Code §1550 lists a sufficient cause or consideration among the essential elements of a contract, and §1605 defines it: a benefit conferred on the promisor, or a prejudice suffered by the promisee, that the party is not already lawfully bound to give. The word doing the work is 'bargained' — each side must give something BECAUSE the other gave something. (c) plays on the everyday sense; deliberation is not consideration. (d) confuses the price with the exchange — consideration may be a promise, an act, or a forbearance, and a contract with no money in it at all is perfectly good. (a) names one common form consideration takes rather than the definition; a deposit is part performance, and the contract binds before any deposit is paid. Note §1614: a written instrument is presumptive evidence of consideration, which shifts the burden to the party denying it.
Civil Code §1550, §1605, §1614Minors generally lack the legal capacity to be bound by contracts, so a contract signed by a minor is voidable at the minor's option, not automatically void. The minor may disaffirm the contract, but an adult party is generally bound if the minor chooses to enforce it. Capacity, not the writing requirement, is the issue here, and voidable is different from void: a void contract has no legal effect at all, while a voidable one remains valid unless the protected party rescinds it.
A contract must have a lawful object. A contract to perform an illegal act, such as knowingly installing dangerous, code-violating work, is illegal and therefore unenforceable by either party; courts generally leave the parties where they find them. Mutual agreement cannot cure illegality. This is not merely voidable by one party; illegality makes the entire bargain unenforceable as against public policy.
Courts apply the objective theory of contracts: mutual assent is judged by the parties' outward expressions, words and conduct, as a reasonable person would interpret them, not by unexpressed private intentions. A party's secret intent not to be bound is irrelevant if their outward conduct manifests agreement. This protects reasonable reliance on what people actually say and do.
Civil Code §1586 lets a proposal be revoked at any time before its acceptance is communicated, and §1587 lists how revocation happens — communication to the offeree, lapse of the stated or a reasonable time, failure of a prescribed condition, or the death or incapacity of the offeror. The facts in this question describe the EXCEPTION rather than the rule: an offer held open by a signed promise is an option, and in construction a subcontractor's bid can be made irrevocable by the general contractor's reasonable reliance under Drennan v. Star Paving Co. (1958) 51 Cal.2d 409. (a) confuses lapse with irrevocability — a reasonable time limits how long an offer lasts, it does not stop the offeror withdrawing it sooner. (b) states the option rule as though it were the general rule. (c) invents a form distinction; revocability does not turn on whether the offer was written.
Civil Code §1586, §1587; Drennan v. Star Paving Co. (1958) 51 Cal.2d 409Under the traditional mailbox rule, an acceptance sent by an authorized or reasonable means is effective upon dispatch, that is, when properly mailed, not when received or read by the offeror. Revocations, by contrast, are effective only on receipt. This rule allocates the risk of transmission delay to the offeror who chose to make the offer.
Civil Code §1550 makes a sufficient cause or consideration an essential element of a contract, and §1605 defines it as a benefit conferred on the promisor, or a prejudice suffered by the promisee, that neither is already lawfully bound to give. A gift promise has neither, so there is nothing to enforce. (c) reaches for the Statute of Frauds, which is a rule about FORM — writing down an unenforceable promise does not supply the consideration it lacks, though Civil Code §1614 does make a written instrument presumptive evidence of consideration, which shifts the burden rather than creating the element. (d) invents a witness rule California does not have. The genuine escape is promissory estoppel: where the promisee justifiably and substantially relies to their detriment, the promise can be enforced despite the missing consideration.
Civil Code §1550, §1605, §1614A promise to pay more for exactly what the other party is already bound to do has no consideration behind it: Civil Code §1605 requires a benefit conferred, or a prejudice suffered, that the party is 'not lawfully bound' to give, and the framer already owed the framing. Two lawful routes exist — §1698(b) enforces an oral modification to the extent it has been executed, and §1698(c) a written one supported by new consideration, so a genuine change in scope or an agreed acceleration would support the increase. (b) is the trap: a signature makes a document, not consideration, and a change order that adds no work adds no obligation — which is also why B&P §7159(e)(3) requires the change order to state the added scope. (c) invents a threshold found nowhere. (d) mistakes assent for consideration, which is precisely the distinction the pre-existing duty rule draws.
Civil Code §1605, §1698(b)-(c); Bus. & Prof. Code §7159(e)(3)The Statute of Frauds (Civil Code §1624) requires certain contracts to be in writing and signed, including agreements that by their terms cannot be performed within one year, contracts for the sale of real property, and suretyship promises to answer for another's debt. Short-term, quickly performed jobs like a next-week fence painting or same-day debris hauling need not be written. The statute targets specific categories, not every contract.
California Civil Code §1624The Statute of Frauds requires a writing for specific categories such as sales of land, promises to answer for the debt of another (guaranties), and contracts not performable within one year. A simple, fully performable-within-days job like installing a water heater tomorrow falls outside those categories and can be enforceable orally, though other laws (like home improvement contract rules) may separately require a writing.
California Civil Code §1624Civil Code §1624(a)(3) makes an agreement for the sale of real property, or an interest in it, invalid unless it or some memorandum of it is in writing and subscribed by the party to be charged. A handshake is not a subscription, so the landowner has a complete defense — subject to part performance or estoppel, which take more than a handshake. (c) misreads consideration: the exchanged promises ARE consideration; the defect is the FORM of the agreement, not its substance. (b) raises capacity, which under Civil Code §1556 turns on minority, unsound mind or deprivation of civil rights, none of which appears in the facts. (a) raises illegality under §1667; selling a vacant lot is entirely lawful.
Civil Code §1624(a)(3); cf. §1556, §1667Civil Code §1624 lists the agreements that are invalid unless in writing and subscribed by the party to be charged: those that cannot be performed within a year, promises to answer for another's debt, agreements for the sale of real property or a lease longer than a year, an agreement authorizing a broker's commission, and a few others. The purpose is evidentiary — to stop a court enforcing an important promise on nothing but one side's recollection. (c) confuses the Statute of Frauds with fraud itself; it punishes nobody and bites on perfectly honest parties who simply failed to write it down. (d) inflates the requirement: a signature by the party to be charged is enough, and §1624 requires notarization nowhere. (b) invents price regulation.
Civil Code §1624A material breach goes to the root of the bargain: it deprives the other party of what it principally contracted for, and it therefore excuses that party's own further performance and lets it terminate. An immaterial breach entitles the injured party to damages but not to walk away — which is why 'the grout is the wrong shade' does not license an owner to stop paying. (d) is exactly that error; substantial performance with minor defects is compensated by the cost of correction, and Civil Code §3358 caps recovery at what full performance would have given. (b) sets the bar far too high: abandonment is one material breach among many, and B&P §7107 makes it separately disciplinable. (c) inverts the remedy — every breach, material or not, sounds in damages.
Civil Code §3358; Bus. & Prof. Code §7107Civil Code §3300 sets the measure for breach of contract: the amount that will compensate the aggrieved party for all the detriment proximately caused, or which in the ordinary course of things would be likely to result — the benefit of the bargain, no more. (b) is punishment, which Civil Code §3294 reserves for obligations NOT arising from contract; a deliberate breach is compensated, not punished. (c) is restitution, a different measure that returns what was conferred, and it is the right one when a contract is rescinded rather than enforced. (d) states what §3358 forbids outright: no one may recover a greater amount than he would have gained by full performance.
Civil Code §3300, §3358; cf. §3294The duty to mitigate requires the injured party to take reasonable steps to limit their losses after a breach, such as hiring a reasonable replacement contractor. Damages that could have been reasonably avoided are not recoverable. The owner need not act unreasonably or incur great expense, but sitting idle and letting losses pile up, or refusing reasonable replacements, can reduce the damages a court will award.
An unequivocal statement, before performance is due, that a party will not perform is an anticipatory repudiation. Civil Code §1440 provides that where a party gives notice before the other is in default that he will not perform, and does not retract it, the other party may enforce the obligation without first performing or offering to perform. The owner need not wait for the start date: he can treat the contract as breached now, engage a replacement and sue for the excess cost, or wait a reasonable time and see. (b) understates it — refusing the entire project goes to the essence of the bargain, which is what makes a breach material. (c) confuses repudiation with a lawful exit; rescission needs a ground under Civil Code §1689, and 'we changed our minds' is not one. (d) confuses a refusal to perform with an agreed change, which takes both signatures.
Civil Code §1440; cf. §1689Under the substantial performance doctrine, a contractor who performs in good faith and completes the essential purpose of the contract, leaving only minor, non-material defects, may recover the contract price minus the cost to correct or complete those defects. Perfection is not required to recover. The owner is protected by the offset for the deficiencies rather than being able to escape paying anything at all.
Specific performance is an equitable remedy ordering a party to perform, granted only where money damages are inadequate, typically because the subject matter is unique, as with real estate, since each parcel of land is considered one of a kind. Courts rarely order specific performance of personal-service or ordinary construction work, both because money damages usually suffice and because supervising forced labor is impractical.
Rescission unmakes the contract. Civil Code §1689 lists the grounds — mistake, fraud, undue influence, duress or menace, failure of consideration, illegality — and Civil Code §1692 requires the rescinding party to restore everything of value received, so far as it can. It is an alternative to enforcing the bargain, not a way of winning it. (d) is specific performance, which does the opposite: it keeps the contract alive and compels performance. (c) is modification, governed by Civil Code §1698. (a) invents a doubling; contract damages under §3300 compensate, and §3358 forbids recovering more than full performance would have given. One consumer instance is worth holding onto: a timely cancellation under Civil Code §1689.6 is a statutory right of rescission that needs no ground at all.
Civil Code §1689, §1692; cf. §3300, §3358, §1689.6A change order is a written amendment: it states the added or deleted scope, the amount added to or subtracted from the contract, and the effect on the payment schedule and the completion date. B&P §7159(c)(5) puts it plainly — a change-order form 'shall become part of the contract only if it is in writing and signed by the parties prior to the commencement of any work covered by a change order' — and §7159(e)(3) requires the contract itself to warn the buyer that an extra is unenforceable against him unless the change order identified all of that in advance. (c) is the practice the statute displaced, and the version that loses in a dispute. (a) is a termination or an abandonment, and abandonment without legal excuse is separately disciplinable under B&P §7107. (b) confuses the document that prevents a dispute with the proceeding that follows when there is none.
Bus. & Prof. Code §7159(c)(5), §7159(d), §7159(e)(3); cf. §7107B&P §7159(d) requires a home improvement contract 'and any changes to the contract' to be in writing and signed by the parties BEFORE the work covered by the change order begins, and §7159(e)(3) requires the change order to identify, in advance and in writing, the scope of the work, the amount added to or subtracted from the contract, and the effect on the progress payments and the completion date. (d) is the most common real-world answer and the most expensive: an unsigned extra billed at the end is unenforceable against the buyer, and it is a standard way for a CSLB complaint to start. (a) leaves the contractor proving an oral agreement he was required to put in writing. (b) is the opposite error — contracts change constantly, and §7159 regulates how, not whether.
Bus. & Prof. Code §7159(d), §7159(e)(3)Quantum meruit is a restitutionary theory: where the owner requested and accepted a benefit, the contractor may recover the reasonable value of the work even with no enforceable agreement on price. On a home improvement job it is a fallback, not a substitute — B&P §7159(d) still requires a signed written change order before the changed work begins, and §7160 makes misrepresentation in obtaining the work a separate offense. (a) Specific performance compels a party to perform a promise already made; it cannot create a payment obligation where no enforceable price term exists. (b) Reformation corrects a writing that fails to reflect what the parties actually agreed — here there is no writing to correct. (d) Liquidated damages is a sum the parties fix IN the contract in advance as the measure of a breach; it cannot be invented afterwards for unbilled extras.
Civil Code §1611; cf. Bus. & Prof. Code §7159(d)Between commercial parties an oral change order may still be enforceable — Civil Code §1698(b) lets an oral agreement modify a written contract to the extent it has been executed — but proving what was agreed is the whole problem, and the party carrying that burden usually loses. On HOME IMPROVEMENT work the rule is harder than 'risky': B&P §7159(d) requires the change to be in writing and signed BEFORE the changed work begins, and §7159(e)(3) makes the contract warn the buyer that an extra without such an order is unenforceable against him. (a) ignores both the proof problem and the statute. (c) confuses modification with novation, which requires everyone's intent to extinguish the old contract (Civil Code §1530). (d) is invented: public works status depends on public funds and a public awarding body, not on how a change was written down.
Bus. & Prof. Code §7159(d), §7159(e)(3); Civil Code §1698(b)An express warranty is a promise or affirmation of fact the contractor actually makes about the work or the materials — 'this roof will be watertight for ten years' — and it binds because it was said, not because the law supplied it. (a) is the IMPLIED warranty, which arises by operation of law: on residential construction Civil Code §896 sets the standards a builder must meet, and §900 requires a one-year express written warranty on fit and finish. The relationship is the point — express warranties add to implied ones rather than replacing them, and Civil Code §1668 limits how far either can be disclaimed. (c) confuses a warranty with a perpetual guarantee; every warranty has a term, and the periods in §896 and §941 run regardless. (d) confuses a contractor's warranty with a manufacturer's product warranty; both can cover the same installed item.
Civil Code §896, §900; cf. §1668Every construction contract carries an implied promise that the work will be done in a good and workmanlike manner — to the standard of a reasonably skilled contractor in that trade — whether or not anyone wrote it down. On residential construction the legislature made much of this explicit: Civil Code §896 sets specific standards covering everything from water intrusion to soils to noise transmission, and §900 adds a one-year express written warranty on fit and finish. (a) inverts the word 'implied'; a warranty that needed a separate signature would be an express one. (b) sets the bar at the owner's personal satisfaction, a taste standard the law does not import into ordinary construction. (c) confuses a quality warranty with a financial one — nothing guarantees the contractor's margin, or the owner's.
Civil Code §896, §900A statement of fact about the goods or the work — 'pressure-treated and rated for ground contact' — becomes an express warranty once the buyer relies on it; it binds because the contractor said it. (a) reaches for an implied warranty, which arises by operation of law rather than from anything anyone said, and it is wrong here precisely because there WAS a statement. (d) inverts the parol evidence rule: Code of Civil Procedure §1856(g) preserves evidence of fraud and misrepresentation, and a warranty the contractor actually gave is not outside evidence contradicting the writing. (b) misapplies the Statute of Frauds, which decides which contracts need a writing (Civil Code §1624), not whether a spoken warranty binds. Where the misstatement was knowing, B&P §7160 adds a $500 penalty and attorney's fees on top of the warranty claim.
Code Civ. Proc. §1856(g); Civil Code §1624; Bus. & Prof. Code §7160A lump sum buys a result, not an accounting: the contractor names one price for a defined scope, keeps whatever it saves and absorbs whatever it overspends. That is why the scope clause matters more here than anywhere else, and why work outside it is a compensable extra rather than part of the deal. (b) is cost-plus, which puts the cost risk on the owner — which is exactly why a real cost-plus contract normally adds a guaranteed maximum price and an audit right. (c) is unit pricing, which shifts quantity risk to the owner but leaves productivity risk with the contractor. (d) is time and materials, which moves both. On residential work B&P §7159(d)(5) requires the contract amount in dollars and cents whichever structure is chosen.
Bus. & Prof. Code §7159(d)(5)A cost-plus contract reimburses documented cost and adds a fee — a percentage of cost, or a fixed fee that does not grow when the cost does. It shifts cost risk to the owner, which is why it normally arrives with a guaranteed maximum price, an audit right, and a defined list of what counts as cost and what the fee already covers. (c) is the lump-sum contract, the opposite allocation: the contractor keeps the saving and absorbs the overrun. (d) is unit pricing, which pays measured quantities rather than actual cost. (a) describes a developer's profit split rather than a construction contract; a contractor paid only when the project sells is financing the owner, and on residential work B&P §7159.5(a)(4)-(5) requires a payment schedule tied to the work as it is actually performed.
Bus. & Prof. Code §7159.5(a)(4)-(5)A guaranteed maximum price is cost-plus with a ceiling: the contractor bills documented cost plus its fee, the owner sees the books, and the owner never pays more than the guaranteed maximum however the cost runs. Savings below the cap are usually shared on an agreed split. (a) removes the mechanism that makes it work — a GMP without open-book cost tracking is a lump sum with extra paperwork, because neither party can tell where the cost stands against the cap. (c) inverts whose protection it is: the contractor's fee is what is at risk above the cap, and that pressure is the point of the structure. (b) confuses two pricing methods; unit pricing measures quantities, and nothing turns one into the other at completion.
Unit pricing answers 'how much per cubic yard?' and leaves 'how many cubic yards?' to be measured as the work is done — exactly right for excavation, grading, paving and undergrounding, where the quantity is not knowable until the ground is open. The owner carries quantity risk; the contractor carries productivity risk. (c) states the condition for a LUMP SUM: where scope and quantities are fixed, one price is cheaper to administer because nobody has to measure anything. (a) is lump sum again, from the owner's side. (b) is time and materials, which pays hours rather than quantities in place and so removes the contractor's incentive to work efficiently. Note that on residential work B&P §7159(d)(5) still requires a contract amount in dollars and cents, so a unit-price home improvement contract must state a total.
Bus. & Prof. Code §7159(d)(5)A time-and-materials contract prices inputs: hours actually worked at a rate the contract sets, plus materials at cost, usually with a stated markup. That is why the record-keeping carries the whole risk, and why B&P §7159.10(e)(7) requires a service-and-repair contract estimated this way to disclose the set rate, the estimated cost of materials, how time will be computed — in quarter hours, half hours or hours — and the statement that the actual amount may not exceed the estimate without the buyer's written authorization. (c) is a lump-sum contract, where the contractor carries the cost risk instead. (a) is a unit-price contract, which prices measured quantities, not hours. (b) describes a guaranteed maximum price with the open-book cost accounting removed, and a GMP without cost tracking is a lump sum wearing the wrong name.
Bus. & Prof. Code §7159.10(e)(7)A fixed-price or lump-sum contract puts the greatest cost-overrun risk on the contractor because the price is set regardless of actual costs; if costs exceed the estimate, the contractor absorbs the loss. Cost-plus and time-and-materials arrangements shift much of that risk to the owner, who reimburses actual costs. This is why accurate estimating and scope control are critical to profitability on fixed-price work.