THE SHORT ANSWER
Estimate a concrete patio by recording its area, specified thickness and resulting volume, then adding site preparation, forms, delivery and finishing. Geometry helps calculate quantities; it does not establish a suitable structural or drainage design.
This guide follows a fictional 12-by-20-foot patio example in Hamilton, Ontario. The linked concrete patio PDF example shows the scope and 7 separate costs in Canadian dollars. Treat it as a worked document, then use measurements, supplier quotes and labour inputs from your own project.
1. Keep geometry and design separate
Write down length, width and the thickness specified for the actual project. The example’s 4-inch thickness is an arithmetic input, not a recommendation for every site or use. Confirm the design and conditions before buying concrete.
2. Convert units before multiplying
The area is 12 × 20 = 240 sq. ft., approximately 22.3 m². Four inches is 0.1016 m, giving about 2.26 m³ of geometric volume. The 2.5 m³ supply line is a separate illustrative purchasing allowance; confirm the order with the supplier and the actual design.
3. Price the work around the concrete
Excavation, base, forming and access can be substantial even when concrete volume is modest. Identify what preparation is included and what conditions would require revision. Include supplier delivery charges or minimums when they apply to your actual quote.
4. Define finish and site handoff
Record the agreed surface finish and what cleanup means. Clarify removal of existing material, surrounding landscape restoration and access requirements. Keep drainage decisions and design approvals explicit rather than implying the sample resolves them.
Review the Canadian project address
For the 12-by-20-foot patio example in Hamilton, Ontario, the example uses the measured trade units shown in its PDF. Residential jobs may mix square feet, linear feet, counts and supplier units; keep each line’s measurement basis visible. Check access, grades, drainage and seasonal site conditions. Confirm any property-line, utility, design or municipal requirements that apply before committing to the work. The figures are fictional CAD inputs, not a local price survey.
Describe which products the customer supplies and which the contractor supplies. State how any site condition outside the visible scope will be assessed and priced. Do not copy an allowance from another city or assume a sample’s tax entry establishes the treatment for this client.
Work through the concrete patio quantities
The matching PDF lets the client check each extension of quantity and unit rate. For this example, two useful checks are:
- Basic site preparation: 240 sq. ft. × C$1.75 = C$420.00.
- Forms and stakes: 64 linear ft. × C$4.70 = C$300.80.
Adding all 7 lines gives a C$3,303.80 illustrative subtotal. The PDF records 0% tax and C$3,303.80 as its total, before any markup. These are chosen sample inputs, not prices observed in Hamilton, Ontario. The measurement basis matters as much as the rate: a material purchase allowance may be larger than the installed area, while a fixture count is not interchangeable with hours of labour.
Check the scope before sending
- Confirm dimensions and specified thickness.
- Check delivery access and supplier charges.
- Define preparation, base and finish scope.
- Resolve design and drainage requirements separately.
Outside the illustrated scope: No engineered design, difficult excavation, existing slab removal, pumping, retaining work or landscape restoration.
Check the business and client names, property location, dates, quantities, unit rates and notes. Confirm tax, markup and any required approvals for the actual job. If selections or site conditions are unresolved, label the line as an allowance and explain how it will be updated.
Common questions
How do I convert this patio quantity to cubic metres?
Convert the 240 sq. ft. area to about 22.3 m² and the 4-inch thickness to 0.1016 m; their product is about 2.26 m³. Order quantity is a separate project and supplier decision.
Does a patio estimate establish the correct slab thickness?
No. An estimate prices an agreed scope. Thickness, reinforcement and suitability need to be determined for the actual site and intended use.
Open the itemized concrete patio example and its app-exported PDF to see these decisions presented to a client. You can adapt the structure while replacing every fictional project input with your own.
