A concrete contract needs a payment schedule tied to stages (deposit, progress, completion), a cracking clause that separates normal cracking from defects you will repair, and delay terms covering weather and access. AI can draft each clause from decisions you make first, but the decisions are yours and a lawyer should check the final text.
Contract rules differ from place to place, so treat every clause here as general information, not legal advice. The realistic aim is to reach your lawyer with a tight draft and your decisions already made, so their time goes on the questions that genuinely need a lawyer. Every figure is invented, and every bracketed number in a sample clause is a placeholder for you to choose.
Five decisions the AI cannot make for you
An assistant will write a confident clause for any position, including a bad one. So before any drafting, settle the five decisions that carry the risk. Write each answer in one sentence. That list becomes the first thing you give the assistant and, later, the first page you give your lawyer.
| Decision | Options to weigh | What should drive it |
|---|---|---|
| Deposit | A percentage on signing, a fixed sum, or none | Your real up-front costs (materials, pump booking, formwork), and any limit on deposits or cancellation window where you work. |
| Stage payments | Two to four stages tied to physical milestones | Keeping each payment roughly in line with work done and money spent at that point. |
| Cracking | What counts as normal, what counts as a defect, how it is measured, what you repair and for how long | Trade guidance on joints and curing, your insurer's view, and what you will genuinely repair. |
| Weather and delay | Right to postpone, notice, new dates, who pays when the customer causes a delay | What you actually do in frost, heat, wind and rain, and your supplier's and pump operator's cancellation terms. |
| Completion | A date, a walk-through, or customer acceptance | The moment your final payment falls due and your warranty clock starts. |
The earlier sections of a concrete job's paperwork supply the facts those decisions rest on: the quantities, the pump and the finishing lines come from your estimate, and the preparation, finish and weather lines come from your quote. The concrete quote template tutorial and the volume estimate tutorial cover those, and the contract should repeat their numbers exactly rather than restate them in new words.
Payment terms: a staged schedule for a $14,800 driveway
Take a residential driveway and apron with a contract price of $14,800. A schedule that follows the work has four stages, and each one is a physical event the customer can see.
| Stage | Trigger | Share | Amount |
|---|---|---|---|
| Deposit | Signing of the contract | 20% | $2,960 |
| Preparation | Excavation, base and formwork ready for inspection | 40% | $5,920 |
| Pour and finish | Concrete placed, finished and jointed | 30% | $4,440 |
| Completion | Walk-through held and recorded in writing | 10% | $1,480 |
| Total | $14,800 |
Check the sum: $2,960 plus $5,920 plus $4,440 plus $1,480 is $14,800. Tie the last payment to a walk-through, not to a calendar date, so that the customer cannot be asked to pay for work they have not seen and you cannot be kept waiting by a customer who never arranges the visit. A few lines in the clause cover the rest: payment is due within a stated number of days of each invoice, you may pause work if a stage payment is overdue, and the customer must sign off the walk-through or list defects within a set time.
Whether a deposit can be non-refundable, how large it can be, and whether the customer has a cancellation window after signing are rules that differ by place and by type of contract. Check them with a lawyer or with the body that licenses contractors where you work before you fix the first line of the table. Keep every payment roughly in step with the work done and the materials bought at that point. Schedules that take far more cash than the work completed tend to attract disputes and, in some places, rules.
To draft the clause, give the assistant your positions, not a request for "a standard payment clause". Here is a prompt built that way:
Draft a payment clause for a residential concrete contract using ONLY the positions below. Number the sub-clauses.
Do not add interest, fees, penalties, retention, or any right I have not listed. Mark anything that depends on
local law as [LAWYER TO CONFIRM]. Use plain English, short sentences, and the defined terms "Contractor", "Customer",
"Price" and "Stage Payment".
Positions:
Price $14,800 in four Stage Payments: 20% on signing, 40% when base and formwork are ready for inspection,
30% when concrete is placed and finished, 10% after the walk-through is recorded in writing.
Each invoice is due within 7 days. If a Stage Payment is overdue by more than 7 days, the Contractor may pause work
and tell the Customer in writing. The Customer must sign off the walk-through or list defects within 7 days.
Deposit covers materials and booking. If the Customer cancels before work starts, the unspent deposit is refunded
after the Contractor's costs already incurred.A sound reply produces five or six short sub-clauses and flags the deposit and cancellation lines for the lawyer. Look hard at what the assistant adds. The usual extras are a late-payment interest rate you did not choose, a "non-refundable deposit" that contradicts your own refund position, "time is of the essence" boilerplate, and a retention of 5% that nobody asked for. Each one changes the deal, so each one comes out unless you decide to keep it. Also check that the percentages in the clause match the table to the dollar, and that "7 days" means the same thing everywhere it appears: calendar days or working days. An assistant will happily mix them.
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Buy nowWhat a cracking clause must admit, and what trade guidance supports
Start from the facts, because a clause that denies them will not survive a dispute. A ready-mixed concrete trade association's practice sheet on cracking in concrete surfaces states that all concrete has a tendency to crack and that completely crack-free concrete cannot be produced. It adds that most random early cracks, although unsightly, rarely affect structural integrity or service life. Its companion sheet on joints in slabs on grade explains that joints are planned cracks: grooves that give shrinkage a place to happen. It recommends a maximum joint spacing of 24 to 36 times the slab thickness, about 10 feet (3 m) for a 4-inch (100 mm) slab, with 15 feet (4.5 m) as the recommended upper limit, and panels that are square or nearly so, never more than 1.5 times as long as they are wide. It also says wire mesh will not prevent cracking.
The cracking sheet is just as clear that most cracks come from design and construction practice. It lists the usual causes: missing or badly made joints, poor subgrade preparation, high-slump concrete or water added on site, poor finishing, fast moisture loss in dry conditions, and weak or absent curing. So an honest clause does two things at once. It tells the customer that some cracking is normal and cannot be promised away. It also commits you to the practices that reduce it, and to repairing cracks that come from the causes you control. A contract that blames every crack on "natural shrinkage" is easy for a customer's adviser to pick apart.
Separate the causes by who controls them, and let the clause follow:
| Cause | Who controls it | How the contract usually treats it |
|---|---|---|
| Poor subgrade preparation or compaction | Contractor | Repaired under warranty |
| Missing, late or badly placed joints | Contractor | Repaired under warranty, and the joint layout is shown on the quote or drawing |
| Extra water in the mix, poor finishing, weak curing | Contractor | Repaired under warranty |
| Fill or ground the Customer supplied or specified, or conditions outside your scope | Customer or ground | Excluded, if the contract says so and you recorded the condition |
| Tree roots, leaking pipes, drainage changes after handover | Customer or third parties | Excluded |
| Vehicles or loads on the slab before the agreed cure period | Customer | Excluded, if the handover sheet told them when it was safe |
| Ordinary shrinkage cracks within the stated tolerance, at planned joints | Nobody | Normal, acknowledged, not a defect |
The exclusions in rows four to six only protect you if the contract says them in plain words and if your records show the condition or the instruction. A customer who supplies the fill, or who is told in writing not to drive on the slab for a stated period, can be held to that. A customer who was told nothing cannot. The preparation and finish lines that sit behind these causes belong in the quote, so write them there first and reference them here.
Tolerance wording you can measure on the day
Cracking disputes rarely turn on whether a crack exists. They turn on whether it is "normal", and the contract that fails is the one that uses a word like "hairline" without saying how wide that is or who measures. The fix is to replace each soft word with something both sides can check with a tape or a gauge on the walk-through.
| Soft wording | Why it fails | Measurable replacement |
|---|---|---|
| "Hairline cracks are normal" | "Hairline" is undefined, so each side picks its own width. | "Cracks narrower than [X] mm, measured at the widest point with a crack-width gauge." |
| "No structural cracking" | Neither side can say what structural means on a driveway. | "Cracks wider than [Y] mm, or where one edge sits more than [Z] mm above the other." |
| "We will repair within a reasonable time" | Reasonable to whom? | "Within [30] days of written notice, weather permitting." |
| "Repairs will match" | Repairs to concrete rarely match in colour or texture. | "Repairs restore the surface to a sound condition. Colour and texture may differ from the original." |
| "One-year warranty" | It is not clear when the year starts. | "[12] months from the date of the recorded walk-through." |
The numbers in square brackets are yours to choose, with your supplier, your trade body's guidance, your insurer or an engineer. An assistant does not know which figures suit your work, and its first suggestion for a crack width will sound authoritative whether or not it is right. Pick the figures first, write them in your positions list, and ask the assistant only to put them into sentences. A crack-width gauge is a small printed card or ruler with lines of known width, and carrying one to the walk-through lets both sides measure rather than argue.
Here is a cracking clause built that way, with the placeholders left in so you can see where your decisions go:
8.1 Concrete naturally shrinks and may crack. The Contractor does not warrant a crack-free surface. Joints are placed as shown on the joint layout attached to the Price, to control where cracking occurs.
8.2 A crack is a Defect only if it is wider than [Y] mm, or if one edge sits more than [Z] mm above the other, measured at the walk-through or within the Warranty Period. Narrower cracks, including those at joints, are normal and are not a Defect.
8.3 The Contractor will repair a Defect caused by the Contractor's work, including preparation, jointing, mix, finishing or curing, within [30] days of written notice, weather permitting. The repair restores a sound surface. Colour and texture may differ.
8.4 The Warranty Period is [12] months from the walk-through. The Contractor is not responsible for cracks caused by fill or ground supplied or specified by the Customer, tree roots, leaking pipes, changes to drainage, or loads placed on the slab before [number] days after the pour.
Ask a lawyer whether limiting the warranty this way is allowed where you work, and whether any wording in 8.1 or 8.4 conflicts with consumer protection rules that cannot be waived. This clause is not a template to copy. It is the shape your own decisions should take.
Once the clause exists, ask the assistant to attack it. A critique prompt from the customer's side is a cheap way to find the holes before a real customer or a lawyer does:
Read clause 8 of this concrete contract as a customer's adviser who wants to challenge it. List every phrase
that is vague, every undefined term, every way a customer could argue a crack is a Defect that the clause does
not clearly exclude, and every way I could be accused of overreaching. Then read it as my insurer and list
anything that promises more than a contractor should. Do not rewrite it. Do not say whether it is legal.
Clause 8:
[paste]A sample reply to that critique says that "sound surface" is undefined, "Warranty Period" starts at a walk-through but no clause says what happens if no walk-through takes place, the list of excluded causes is an exhaustive list but "ground supplied or specified" is ambiguous when the customer only approved your suggestion, and "weather permitting" is not defined in clause 8, so a customer could say you are using it to delay. From the insurer's side it flags that "restores a sound surface" is a performance promise that could be read more broadly than intended.
Each of those becomes a decision. You might add "if no walk-through is held within 14 days of the pour, it is treated as held on day 14", define "weather permitting" by cross-reference to the delay clause, and replace "sound surface" with a description of the repair method you actually use. The assistant found the gaps. You and your lawyer choose the fixes.
Weather and delay terms that keep payments moving
Concrete work cannot always go ahead on the planned day, and the contract should say so before it happens. The trade guidance supports the main reasons. The cracking sheet quoted earlier advises not placing concrete on a frozen subgrade, and it recommends wind breaks, fog sprays or wet coverings when conditions dry fresh concrete quickly, because that is when surface cracking is most likely. Both are good reasons to postpone, and your clause should give you the right to do so.
A delay clause has four parts. The first is the right to postpone: you may move a pour for weather or ground conditions you judge unsuitable, without penalty. The second is notice: you tell the customer as soon as you decide, by a stated channel, and propose a new date. The third is customer-caused delay: if the customer changes the design, blocks access or fails to pay a stage, the dates move and you may charge stated amounts for costs such as a rebooked pump or a second mobilisation. The fourth is the long stop: if the work cannot be done within a stated number of days of the planned date, either side may discuss a new plan or end the contract, with the unspent deposit refunded after costs you have already incurred.
Make payments follow the work, not the calendar. Stage payments fall due when the stage is reached. A weather delay then moves both the completion date and the payment dates together, and nobody is billed for a stage that has not happened. State that the postponement does not entitle either side to damages or a refund unless the long stop is reached.
Here is a delay clause assembled from those four parts. The bracketed numbers are placeholders:
9.1 The Contractor may postpone any stage of the work, including the pour, if weather or ground conditions are unsuitable in the Contractor's judgement, including frozen ground, heavy rain, or heat or wind that would dry fresh concrete too quickly. The Contractor will tell the Customer by [phone call and message] as soon as the decision is made and will propose a new date.
9.2 A postponement under 9.1 moves the dates of the work and of the related Stage Payments. It does not entitle either party to damages or a refund.
9.3 If the Customer changes the work, delays access, or does not pay a Stage Payment when due, the dates move accordingly, and the Contractor may charge the costs listed in Schedule [B], such as rebooking the pump and an additional visit.
9.4 If the work has not started within [30] days of the planned date because of postponements under 9.1, either party may give written notice to discuss a new plan or end the contract. If the contract ends, the Contractor refunds the unspent part of the deposit after deducting costs already incurred.
When you ask an assistant to draft a clause like this from a bare request, the common failure is to import a one-sided or unrequested term. A typical first draft adds a line such as "the Contractor shall pay liquidated damages of $500 for each day of delay" because that phrase is common in construction contracts. It also tends to use "force majeure" with no definition, which invites an argument about whether a wet week counts. If you did not decide on a daily penalty, strike it. If a customer asks for one, keep it modest, put a cap on the total, and list the delays that do not count: weather, customer changes, late access and unpaid stages. Whether a clause like that is enforceable varies by place, which is a question for your lawyer rather than for the assistant.
The weather decisions themselves belong in your pour planning, not in the contract alone. The pour schedule tutorial covers planning pours around forecasts and crews, so that the clause describes how you already work.
A drafting workflow in six steps
The method behind all of this is a sequence you can repeat for any contract. It uses AI for what it does well, which is structuring, wording and finding gaps, and leaves the choices with you.
- Write the positions sheet. One sentence per decision from the table above, with the numbers filled in.
- Draft one clause at a time. Give the assistant the relevant positions, define the terms once ("Contractor", "Customer", "Price", "Stage Payment", "Defect", "Warranty Period"), and forbid additions. Short prompts with narrow tasks beat one request for "a full contract".
- Ask for a plain-English summary of each clause in two sentences. If the summary does not match your intent, the clause does not either.
- Run the critique from the customer's side, then from your insurer's. List the findings as decisions, not edits.
- Check consistency. Paste the clauses, the payment table and your quote and ask for any difference in numbers, dates, defined terms, or the meaning of "days".
- Prepare the lawyer pack. The draft, the positions sheet, and a list of questions.
The last step is where the assistant is most useful. Ask it to produce the list of questions your lawyer should answer, based on the draft and the places where it flagged local law:
Based on the draft contract and my positions sheet below, list the questions I should put to a lawyer.
Group them under Payment, Cracking and warranty, Delay and cancellation, and General.
Include every place where the draft depends on local rules, and every place where my position could be unenforceable.
Do not answer the questions.The list that comes back usually includes whether the deposit size and any non-refundable element are allowed for this type of work, whether the customer has a cancellation window, whether the warranty limits can be enforced against a consumer, whether the weather clause conflicts with any rule on completion dates, and whether the long-stop refund wording is safe. A lawyer who starts from that list is working on your actual decisions. The tutorial on whether AI can review a contract and the terms of business tutorial explain what to hand over and what to keep.
Three jobs, three versions of the same terms
Build the full set of clauses once, then trim and adjust for each kind of job. The adjustments matter more than the shared text.
| Job | Payment | Cracking | Delay |
|---|---|---|---|
| Residential driveway | Four stages, as in the $14,800 example | Appearance matters most. Show the joint layout to the customer and measure at the walk-through. | Weather, plus customer access: parked cars, gates, a neighbour's drive. |
| Garage slab or shed base | Two stages: deposit, then balance on completion | Fewer joints and a smaller panel count. If the floor will be covered, say so and say what that changes. | Weather and the timing of any inspection. |
| Commercial loading apron | Monthly claims against measured work, perhaps with a holdback | Heavy vehicles change the design, so the designer specifies the joints and load details. Fix the hold period before traffic returns. | Access windows, traffic arrangements and permits, with costs for blocked access and a firm long stop. |
For the commercial case, the customer's own paper may override yours. Paste their conditions next to your clauses and run the consistency check from step five of the workflow, because two documents that disagree on payment days or defect periods will be read in whichever way suits the reader. The stage payment invoice tutorial shows how to turn each stage into an invoice once the contract is signed.
The paper trail that settles cracking disputes
When a customer rings about a crack six months later, the contract tells you what you promised, and your records tell you what you did. Keep, for every job: the joint layout, photos of the prepared subgrade and formwork before the pour, the delivery tickets, a pour log, the curing method and dates, a handover sheet, and the walk-through photos with a crack-gauge reading for any crack you noticed. The cracking sheet cited earlier recommends starting curing as soon as possible, with a curing compound or with damp hessian (burlap) kept moist for at least three days, so the log should show what you did and when.
The pour log is where an assistant helps with the tedious part. Dictate or type rough notes on the day, then have the assistant turn them into a tidy record and a customer handover note. The rule is the usual one: only facts you gave it.
Turn these pour-day notes into (1) a pour log table with Time, Activity, Notes, and (2) a short handover note for
the customer in plain English. Use only the notes. Do not invent temperatures, times, products or advice.
If something is missing, list it under "Missing".
Notes:
Tue. Started 7.15 after subgrade check, compacted base ok. Delivery 1 arrived 7.40, delivery 2 at 9.00.
Cool, light wind, dry. Broom finish. Joints cut 6 hours after finish, spacing about 10 ft on 4 in slab.
Curing compound sprayed straight after finishing. Customer asked about driving on it.A sample reply gives a four-line log and a handover note that thanks the customer, describes the curing compound and the joints, explains that some cracking at joints is normal, and lists "Missing: temperature readings; agreed no-traffic period; final walk-through date". That last list is the useful part. The assistant noticed that the customer asked about driving on the slab and that the notes say nothing about the answer. Fill in the period from your supplier's or trade body's guidance, not from the assistant, and put it in writing before the customer drives anywhere. The same note should say how to contact you, and what the walk-through will check. Check the timings against the guidance too: the joints sheet gives 4 to 12 hours after finishing for conventional saw-cut joints, so a cut at 6 hours sits inside that window and is worth recording exactly as it happened.
Review the handover note against the contract before it goes out. If the note says anything about warranty, tolerance or weather, it must match clauses 8 and 9, and if it promises something the contract does not, the customer will rely on the note.
Checks before the first customer signs
Run through this list on the finished contract, and tick every line yourself instead of asking the assistant to confirm it.
- Every square bracket has been replaced by a real number, and no placeholder text survives anywhere, including the schedule and the handover sheet.
- The Stage Payments add up to the Price, and the percentages in the clause match the table to the dollar.
- "Days" means calendar days or working days, and it means the same in the payment, cracking and delay clauses.
- The crack widths, height difference, repair period and warranty length in the contract match the handover sheet and the walk-through form.
- The joint layout is attached, and the weather clause refers to the same conditions your pour planning uses.
- Your lawyer has reviewed the template once, and your insurer or broker knows what warranty you are offering.
- You have tried to break it. Read the draft as a customer who is angry about a crack, and as one who is angry about a delay, and see what each of them could point to.
Keep the signed contract, the attachments and your pour records together in one folder per job, so that the answer to a customer's question six months later is a two-minute search and not an afternoon of reconstruction.
Questions about concrete contract terms
Can I refuse to warrant against cracking?
You can state that concrete cracks and that you do not warrant a crack-free surface, and industry guidance supports the first point. What customers, and in many places the law, will expect is that you stand behind defects in your own work, such as poor jointing, preparation or curing. A clause that blames every crack on shrinkage tends to fail in a dispute. Ask a lawyer how far you can limit liability.
Is a deposit refundable if weather delays the job?
That depends on your contract and the rules where you work, so decide it in advance and write it down. A common approach is that weather moves the date but does not let either side cancel unless the delay passes a stated limit, when the unspent part of the deposit is refunded after costs already incurred. A lawyer should confirm what is allowed.
How large a deposit can I ask for?
There is no universal figure. Some places cap deposits on home-improvement work or give customers a short window to cancel after signing, and others do not. Base the deposit on real up-front costs such as materials and booking a pump, and ask a lawyer or the body that licenses contractors where you work what limits apply before you set it.
Should the contract include a delay penalty?
Customers sometimes ask for a daily penalty if you finish late. If you agree to one, keep it modest, cap the total and list the delays that do not count, such as weather, customer changes and late access. Never accept an open-ended penalty. A lawyer should draft or review it, because whether penalty clauses are enforceable varies by place.
Further reads
- How to Bid Concrete Jobs: Quantities, Pump Costs and AI Checks — Price the job before the contract: quantities, pump and finishing.
- AI for Concrete Contractors: Estimating, Pour Scheduling and Weather Calls — The wider picture of AI in a concrete firm.
- Paving Contract Template: Payment, Base and Weather Clauses With AI — A related contract for paving, with its own base and weather terms.
- Construction Retainage: Track It and Chase Release With AI Reminders — If a customer or main contractor holds back part of the payment.
- AI Contract Review for Small Firms: What It Catches and Misses — What AI contract review catches and misses.
- Asphalt Paving Proposal Template: Scope, Exclusions and Weather Terms — Scope, exclusions and weather terms for a paving proposal.
- Foundation Repair Leads: Screen Crack Photos With AI Before the Visit — Six intake questions, a four-photo request, an AI summary that describes but never diagnoses, an engineer-referral rule, reply scripts and the lead-cost sums.
- Tile Installation Contract: Substrate and Warranty Clauses With AI — Five clauses carry most of the risk in a tile contract. Here is how to have AI draft them from your own numbers, then fix what it gets wrong.
- Can AI Draft Flooring Contract Clauses for Subfloor and Moisture? — The subfloor, moisture, acclimatisation and warranty clauses a flooring contract should carry, with a prompt to draft them and the checks to make before use.
- AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.
Sources: NRMCA Concrete in Practice sheets CIP 4 (Cracking Concrete Surfaces) and CIP 6 (Joints in Concrete Slabs on Grade), fetched November 2026. General information, not legal advice; all sums are illustrative.