Key points
- A complete slab price includes preparation, placement access, joints, finish, drainage, and restoration.
- Agree on elevation and water route before forms and concrete arrive.
- Specify assumptions for subgrade, placement, finish, curing, and later repairs.
- Canadian retail materials do not establish installed project prices.
U.S. concrete-patio price signal
HomeGuide’s patio cost guide reports about $5–$15 per square foot installed for a concrete patio on existing compacted, level, well-draining ground. This is a broad U.S. planning range for that starting condition, not a quote or a Canadian rate. Demolition, substantial excavation, soil correction, grade changes, drainage, access for placement, finish choices, and restoration may add cost; compare written proposals with the same preparation and slab assumptions.
Price the site preparation and the pour
The slab is the visible result of several operations: excavation, handling unsuitable soil, base preparation, forms, reinforcement if specified, delivery, placement, finishing, joints, curing, and restoration. A small patio with difficult access can cost differently from a larger area beside truck access. Ask whether concrete can be discharged at the work area or must be pumped or carried, and who protects doors, siding, landscaping, and existing paving.
State the measured area and what the contractor assumes about subgrade and base. If unknown soil or buried material could change the scope, ask for a written allowance and approval process. Demolition, hauling, disposal, imported fill, and restoration should not be hidden inside an unexplained square-foot price.
Make the design assumptions visible
“Concrete patio” can mean a basic broom-finished slab, colored or stamped concrete, a slab with steps or walls, or a replacement over a difficult base. Specify the finish, color or pattern, edges, steps, and any sealer. Custom colors and stamped patterns can make later repairs harder to match. Ask what variation the contract considers acceptable and what the warranty covers.
Request the contractor’s assumptions for thickness, reinforcement, joints, and curing. Control joints influence where cracking may occur but cannot guarantee a crack-free slab. Reinforcement and thickened edges should be tied to the project design rather than a universal rule. Sealer is a maintenance choice, not a substitute for suitable preparation or drainage.
Set elevation and drainage before forming
Confirm the patio elevation at doors, steps, vents, window wells, siding, and adjacent paving before forms are set. A slab that is too high can direct water toward the building; one that is too low can create a step or trap runoff. Ask how runoff will leave the patio and where it will be received. If a slope drains toward the slab, the estimate may need a swale, channel drain, or other diversion.
A patio beside a retaining wall, fence, or property line has an interface that should be assigned in the proposal. Local grading, discharge, utility-locate, and permit questions need confirmation with the responsible authority. Do not accept an unexplained slope number as a complete water-management plan.
Compare future repair paths
A continuous slab can be efficient for a simple layout, but later utility or drainage work may require cutting, patching, or replacing a section. Matching an aged finish can be difficult. Settlement, structural movement, or persistent water may make a surface coating an incomplete repair if the cause remains below the slab. Compare removal and disposal with retaining a sound slab, and ask what evidence supports any repair recommendation.
Pavers, stone, and gravel have different edges, joints, access, and maintenance. Compare complete assemblies with the same area, preparation, elevation, drainage, access, and restoration assumptions. Canadian retail bag prices are material observations, not an installed patio quote.
Make the estimate auditable
Ask the proposal to show measured dimensions, excavation and base assumptions, forms, reinforcement or joints, finish, drainage, access, concrete delivery, curing, restoration, taxes, exclusions, and warranty. Clarify what happens if rain, groundwater, rock, buried services, or unsuitable soil delays placement. Keep photos, joint layout, finish information, product details, and final elevations for future maintenance or repair.
Confirm delivery and placement logistics
Concrete is delivered in a time-sensitive sequence, so access and staging can affect labor and the planned pour. Ask whether the truck can reach the forms, a pump is expected, or material must be carried through a gate or occupied area. Confirm who protects adjacent finishes and landscaping, where equipment can stand, and how the crew handles weather or a delayed delivery. These questions are especially useful when the patio is behind a home, on a slope, or separated from street access.
The estimate should also state how the prepared base will be accepted before concrete placement and what happens if it is wet, soft, or inconsistent with the assumed condition. Coordinate concrete work with drain lines, downspout routes, utilities, steps, and retaining-wall interfaces before the pour. Once the slab is placed, changing those items may require cutting or replacing concrete and matching the finish.