Concrete Contract Template: How to Write a Concrete Work Agreement

A concrete job lives or dies on the details that never make it into a verbal quote. How thick is the slab? What PSI? Who pays when the customer decides mid-project that the patio should be 200 square feet bigger? A written concrete contract answers those questions before the truck shows up, and it keeps a routine driveway pour from turning into an unpaid dispute.

This guide walks through how to write a concrete work agreement that protects you as the contractor: what to put in the scope, how to price by the square foot without losing money on change orders, and the clauses that decide who pays when concrete cracks.

What is a concrete contract?

A concrete contract is a written agreement between a concrete contractor and a property owner (or a general contractor) that sets the scope, price, and terms for a specific pour. It covers flatwork like driveways, sidewalks, patios, and garage floors, as well as structural work like footings, foundations, and retaining walls.

The agreement does three jobs at once. It tells the customer exactly what they are buying, it tells you exactly what you are obligated to deliver, and it gives both sides a document to point to when memory and expectations diverge. On a $400 sidewalk that hardly matters. On a $15,000 stamped patio with a decorative finish, it is the difference between getting paid and eating the cost of a misunderstanding.

Concrete work also carries risks that other trades don't. The material is unforgiving once it sets, weather can shut down a pour for a week, and cracking is a normal property of concrete that customers often read as a defect. A good contract addresses all three before they become arguments.

Key clauses every concrete contract needs

1. Scope of work

Write the scope so a stranger could read it and know what you are pouring. Vague scopes ("pour driveway") invite disputes; specific ones end them.

Include:

• The exact area and dimensions (for example, "24 ft x 40 ft driveway, 960 sq ft")
• Slab thickness (4 inches for most residential flatwork, 5 to 6 inches for heavy vehicle loading)
• The finish: broom, smooth trowel, exposed aggregate, stamped, or stained
• Reinforcement: rebar grid, wire mesh, or fiber-reinforced mix
• Subgrade and base prep: grading, gravel base depth, compaction
• Control joints and expansion joints, and their spacing
• What is excluded (demolition of old concrete, hauling, landscaping repair)

Spelling out exclusions is as important as the inclusions. If you are not removing the existing slab or fixing the lawn the truck drove over, say so in writing.

2. Materials and specifications

Concrete is not generic. Name the mix so there is no argument later about what you delivered.

• PSI (compressive strength): 3,000 to 4,000 PSI for residential flatwork; higher for structural or commercial pours
• Slump: the workability of the mix, typically specified by the ready-mix supplier
• Admixtures: air entrainment for freeze-thaw climates, fiber for crack control, accelerators or retarders as needed
• Aggregate and color for decorative finishes

State that the ready-mix delivery tickets serve as proof of the mix supplied. Those tickets are your evidence if a customer later claims you used a weaker mix than agreed.

3. Pricing and payment schedule

Most concrete work is priced per square foot, with the rate driven by thickness, finish, and reinforcement. Your contract should make the math transparent:

• The unit price (for example, "$8.50 per sq ft for a 4-inch broom-finished slab")
• The estimated square footage and resulting estimate
• How the final price adjusts if measured square footage differs from the estimate
• A deposit (commonly 25 to 50 percent) due before the pour to cover material orders
• The balance due on completion, or a milestone schedule for larger jobs

Material costs, especially ready-mix and rebar, move with the market. For jobs scheduled weeks out, add a clause letting you adjust the price if supplier costs rise above a stated threshold before the pour date.

4. Change orders

The single most common way concrete contractors lose money is doing extra work for free. A customer asks you to extend the patio while you are already on site, you say sure, and now there is no paper trail for the extra 150 square feet.

Require that any change to the scope, square footage, finish, or thickness be documented in a written change order signed by both parties before the work proceeds, with the added cost stated. This protects your margin and protects the customer from surprise charges.

5. Weather and delays

Concrete cannot be placed safely in freezing temperatures or steady rain. Build in a weather clause that lets you reschedule without penalty when conditions fall outside safe placement limits. Define those limits (for example, ambient temperature below 40°F, active precipitation, or a frozen subgrade), state that the pour moves to the next available working day, and make clear that weather delays are not grounds for a refund or discount. The same logic applies to delays caused by the customer not having the site ready.

6. Cure time and access

Fresh concrete needs time. Tell the customer how long to stay off it: typically 24 to 48 hours for foot traffic and 7 days before driving on it, with full cure strength at around 28 days. Put it in writing so that when someone parks a truck on a two-day-old driveway and cracks it, the damage is on them, not your warranty.

7. Warranty

A clear warranty manages expectations and limits your exposure. Address cracking head-on, because it is the issue that generates the most callbacks. Hairline shrinkage cracks are normal and should be excluded. Structural failures from bad subgrade prep, wrong mix, or missing control joints are yours to fix. State the warranty length (one to two years is common for workmanship), require written notice of problems within the window, and exclude damage from misuse, ground movement, de-icing salts, and acts of nature.

8. Lien rights and waivers

Mechanics lien rules vary by state, but most customers and general contractors will want assurance you and your suppliers are paid. Agree to provide conditional lien waivers as payments are made and a final unconditional waiver once the job is paid in full. If you use subcontractors or buy materials on account, this clause protects the owner and keeps you in good standing for the next job.

9. Insurance and licensing

State that you carry general liability insurance and workers' compensation, and that you hold any license your state or municipality requires for concrete work. Customers increasingly ask for proof, and naming it in the contract signals you run a legitimate operation.

How to write a concrete contract: step by step

Step 1: Identify the parties. Use full legal names and business entities. If you are a sub working under a general contractor, name the GC and reference the prime contract.

Step 2: Describe the site and scope. Address, dimensions, thickness, finish, reinforcement, and base prep. Attach a simple drawing or site plan for anything beyond a basic rectangle.

Step 3: Specify the materials. PSI, slump, admixtures, and joint layout. Note that delivery tickets confirm the mix.

Step 4: Set the price and payment schedule. Unit price, estimated square footage, deposit, and balance terms. Add the price-adjustment and square-footage-reconciliation language.

Step 5: Add the protective clauses. Change orders, weather, cure time, warranty, lien waivers, insurance.

Step 6: State timeline and access. Target start date, expected duration, and what site access and utilities the customer must provide.

Step 7: Sign and date. Both parties sign. Collect the deposit before ordering material.

Decorative and stamped concrete: extra terms to include

Stamped, stained, and exposed-aggregate work carries higher margins and higher expectations, so the contract needs more detail than a plain gray slab. Color is the usual flashpoint. Cured concrete rarely matches the sample chip exactly, and color can vary across a pour because of moisture, temperature, and batch differences. Say so in writing: state that minor color variation is inherent to decorative concrete and is not a defect, and that the customer approved the color and pattern from a physical sample before the pour.

Spell out the sealer, too. Decorative finishes need periodic resealing to hold their look, and that maintenance is the owner's job, not a warranty item. Note the sealer type, the initial application included in your price, and the recommended resealing interval. Add that the warranty does not cover wear, fading, or efflorescence (the white powdery residue that surfaces as concrete cures) on decorative surfaces.

For stamped jobs, attach a photo or reference number for the chosen pattern and color so there is no argument about what "Ashlar slate, weathered tan" was supposed to look like.

Common mistakes concrete contractors make

Quoting a lump sum with no square-footage basis. When the customer expands the job, you have no agreed unit price to bill the extra against. Always tie the price to a rate and a measured area.

Saying nothing about cracking. Customers expect a perfect, crack-free slab forever. Concrete shrinks and cracks. If your contract is silent, every hairline becomes a warranty fight. Define what is normal up front.

Skipping the change-order requirement. Verbal "while you're here" additions are unpaid work waiting to happen. No written change order, no extra pour.

Ignoring subgrade responsibility. If the customer's site is unstable or full of organic fill, that affects the slab. Specify the base prep you are providing and disclaim failures caused by ground conditions outside your scope.

No weather clause. Pour a slab the night before a hard freeze with no protective language and you own every spall and surface defect that follows.

Concrete contracts and the broader construction picture

A concrete pour rarely happens in isolation. It sits inside a larger build, which is why a clean concrete agreement should align with the documents around it. If you are working under a general contractor, your terms should mesh with the construction contract governing the project. Site work often starts with grading and digging, so coordinate your scope with whoever holds the excavation contract to avoid overlapping liability for the base.

The protective clauses in a concrete agreement mirror those used across the trades. The weather and warranty language reads much like a roofing contract, where conditions outside the contractor's control routinely push the schedule. And if your concrete work ties into hardscaping or grounds, it pays to read how a landscaping agreement handles site access and seasonal timing so the two scopes don't collide.

Generate Your Concrete Contract with Contractable

A solid concrete work agreement is mostly about anticipating the predictable problems: scope creep, weather, cracking, and payment. Once you know the clauses to include, drafting one is straightforward. Contractable builds a customized concrete contract in seconds, with the scope, pricing, and warranty terms set for your specific job. No legal background required, just answer a few questions and get an agreement ready to sign.