Concrete Patio Cost: New Slab Installation and Site Preparation
Key points
Start with the slab and site conditions
“Concrete patio” can describe a basic broom-finished slab, a coloured or patterned surface, a slab with steps and walls, or a replacement over a difficult subgrade. The material choice is only one part of the budget. Excavation, disposal, base preparation, forming, reinforcement if specified, joints, placement access, finishing, curing, sealing, drainage, and restoration should be visible in the proposal.
| Scope question | Why it matters |
|---|---|
| Is the existing surface removed? | Demolition, hauling, dust control, and disposal are different from a new build on open soil. |
| What is beneath the slab? | Soft fill, roots, buried debris, or wet soil can require correction before concrete is placed. |
| How will the slab drain? | Finished slope and edges must keep water from ponding at the home or flowing toward a wall. |
| How will concrete reach the site? | Truck access, pumping, wheelbarrow distance, gates, and steps affect placement logistics. |
| What finish is specified? | Broom, exposed aggregate, colour, stamping, borders, and sealer change labour and future repair expectations. |
Joints, reinforcement, and finish should be explicit
Ask the contractor to show the planned control joints, isolation joints at fixed structures, slab thickness assumptions, and any reinforcement or thickened edges. These details are project-specific; a generic promise that a slab will never crack is not realistic. Joints can influence where cracking is encouraged, but they do not eliminate movement from soil, moisture, roots, or other site conditions.
Finishes also create different repair questions. A basic broom finish may be easier to reproduce than a custom colour or stamped pattern. Sealer is a maintenance decision, not a substitute for a sound slab and drainage. Confirm whether colour variation, hairline cracking, efflorescence, or minor surface changes are addressed in the contract and warranty.
Finished elevation is a drainage decision
Before forming begins, confirm the patio elevation at doors, steps, vents, window wells, siding, and adjacent paving. A patio that is too high can direct water toward the building; one that is too low can create a step, trap runoff, or require a drain. The proposal should explain the fall and the outlet rather than simply stating a percentage without reference to fixed features.
If the patio sits below a slope, ask whether an upslope swale, channel drain, or other diversion is needed. If it meets a retaining wall, ask who owns the drainage interface and how inspection or future repair remains possible. Local grading, discharge, utility-locate, and permit questions require verification with the responsible authority.
Repair economics are part of the choice
A continuous slab can be efficient for a simple, accessible layout, but localized utility or drainage work may require cutting and patching. Settlement, structural cracking, heaving, or persistent water can make resurfacing a poor substitute for correcting the base or drainage. A decorative overlay can hide a symptom while leaving movement beneath it. Ask the contractor to identify the mechanism being repaired and the evidence supporting the recommendation.
For a replacement, compare removal and disposal with the cost of retaining a sound slab. For a new pour, keep the mix, finish, joint layout, reinforcement, sealer, and curing instructions with the project record. The next contractor will need more than the colour name to make a compatible repair.
Ask for a complete proposal
Require measured dimensions, excavation and base assumptions, forms, reinforcement, joints, finish, drainage, access, utility locating, concrete placement method, curing, sealing, restoration, taxes, exclusions, and warranty. Ask what happens if rain, groundwater, rock, buried services, or unsuitable soil delays placement. A proposal that identifies those decisions is more useful than an unexplained square-foot price.
- A concrete patio price assumes a particular site and assembly.
- Drainage, elevation, preparation, access, and restoration can dominate.
- Canadian retail bag prices are not installed project prices.
- Avoid universal reinforcement, thickness, slope, or freeze-thaw claims without site-specific support.
The slab is the visible result of site preparation
Before concrete is ordered, the contractor must account for the ground and the route to the pour. Excavation, unsuitable soil, imported or exported material, base preparation, forms, reinforcement where the design calls for it, concrete delivery, pumping, finishing, joints, curing, and restoration can all affect the price. A small patio with difficult access can be a different budget from a larger patio beside a truck-accessible driveway.
Ask how the proposed finished elevation relates to doors, steps, windows, foundations, adjoining paving, and drainage. A patio should not simply be made flat if that traps water or directs it toward the building. Changes in grade may also alter an adjacent retaining wall, fence, planting area, or property boundary. Include the route for water and the restoration boundary in the written scope.
Choose finish and performance together
Broom, exposed aggregate, stamped, colored, and other finishes change labor, materials, appearance, and future matching. They do not eliminate the need for a suitable base, joints, drainage, and curing. Ask what maintenance and sealing are expected and whether the warranty covers only workmanship at the surface or also cracking, settlement, and water-related conditions.
Cold weather, deicing exposure, soil movement, and repeated wetting can be important, but a generic statement about freeze-thaw performance is not a design for the property. Request the contractor’s assumptions and verify any material or specification claims against the applicable product and local practice.
Compare a new slab with other surfaces
Concrete creates a continuous surface, so a future utility repair or localized settlement may require cutting, patching, matching, or replacement. Pavers may offer a different access and reinstatement path. Stone and gravel change the joint, edge, delivery, and maintenance decisions. Compare complete assemblies on the same area, finished grades, drainage, access, and restoration rather than comparing surface-only allowances.
Keep photographs, joint layout, finish information, product details, and final elevations. Those records help a future owner decide whether a defect is localized or whether the base and drainage need a broader review.
Make the estimate easy to audit
Before comparing totals, ask for the measured area, proposed thickness or section, base assumptions, reinforcement or joints, finished elevations, and the boundary of restoration. The proposal should identify demolition and disposal separately from new concrete, and it should say whether access, forms, edge restraints, curing protection, sealing, and cleanup are included. If the contractor cannot see the subgrade, request a stated allowance and a change process rather than treating an unknown condition as included.
Also record the decisions that are not visible in a square-foot price. Note where downspouts discharge, how the patio meets doors and steps, which surfaces must remain in service, and what finish variation is acceptable. A complete scope lets a homeowner compare a simple replacement with a project that also corrects grade or drainage. It also creates a useful baseline if cracking, settlement, or water movement appears later.