THE ESTIMATING ANSWER
For one detached garden shed pad, start with a defined scope and measurement basis. Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness. Keep excavation, granular base, reinforcement allowance and concrete supply separate. Price the listed tasks separately and state the condition that would require a revision: Unexpected fill or poor bearing ground changes excavation and base design.
This guide uses a fictional project in Moncton, New Brunswick: One detached garden shed pad. Its matching estimate and PDF give each scope decision a visible CAD cost line. Use the document to understand the structure; verify the actual building, product schedule, labour and supplier inputs before preparing a client quote.
1. Define the measured job
Build a level concrete base for a selected garden shed footprint with excavation, compacted base, edge forms and specified slab thickness. Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness. Record the measurements and existing condition in the estimate before turning quantities into line items. The scope should make clear why this is a separate project from a broader renovation or maintenance quote.
Measurement basis: Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness.
2. Build a product and labour schedule
Keep excavation, granular base, reinforcement allowance and concrete supply separate. This example has 7 distinct lines, including setting-out and protection, excavation, base aggregate allowance. Use actual supplier prices and labour inputs for a customer job; the displayed amounts are fictional document inputs.
Selections to confirm: Keep excavation, granular base, reinforcement allowance and concrete supply separate.
3. Sequence the work and handoffs
Confirm shed supplier base requirements and drainage before pour day. Show which task depends on access, a selected product or another trade. If that dependency is still open, label the price preliminary and identify the information needed before a firm quote.
Work sequence: Confirm shed supplier base requirements and drainage before pour day.
4. Set a change boundary
Unexpected fill or poor bearing ground changes excavation and base design. The example excludes shed assembly, electrical supply or engineered foundation. Record the discovery, agree the revised work and update the estimate before adding it to the job.
If the job changes: Unexpected fill or poor bearing ground changes excavation and base design.
Review the Canadian job address
Review access, grades, drainage and seasonal conditions at the property. Check utility locations, product availability and any local design or municipal requirements that apply to the real scope.
The concrete supply line is measured as 1.53 m³. Confirm design volume and supplier order quantity separately; the purchase allowance is only an illustrative input. The example amounts are fictional CAD document inputs, not current rates for Moncton, New Brunswick or another community. A site visit and current supplier information are needed to replace them.
Work through the itemized calculation
Check each extension of quantity and rate in the paired PDF. Two lines from this project are:
- Excavation: 120 sq. ft. × C$6.90 = C$828.00.
- Formwork: 44 linear ft. × C$9.65 = C$424.60.
Adding all 7 rounded line amounts gives C$4,360.50. The PDF shows 0% tax and the same total before any markup. The sample shows 0% tax only to make the arithmetic visible. Determine any applicable GST, HST or PST and markup for the actual work before sharing a quote.
| Work item | Quantity | Unit rate | Amount |
|---|---|---|---|
| Setting-out and protection | 1 job | C$225.00 | C$225.00 |
| Excavation | 120 sq. ft. | C$6.90 | C$828.00 |
| Base aggregate allowance | 1 job | C$425.00 | C$425.00 |
| Formwork | 44 linear ft. | C$9.65 | C$424.60 |
| Reinforcement allowance | 1 job | C$360.00 | C$360.00 |
| Concrete supply | 1.53 m³ | C$430.00 | C$657.90 |
| Place and finish | 120 sq. ft. | C$12.00 | C$1,440.00 |
| Illustrative subtotal | C$4,360.50 | ||
Scope and pricing boundaries
Build a level concrete base for a selected garden shed footprint with excavation, compacted base, edge forms and specified slab thickness.
Outside this example: No shed assembly, electrical supply or engineered foundation.
Keep the product allowance, installation work and any unresolved condition visible as separate decisions. If access or the selected product changes, update the affected quantity or rate and explain the revision before the client relies on the estimate.
Before you send the estimate
- Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness.
- Keep excavation, granular base, reinforcement allowance and concrete supply separate.
- Confirm shed supplier base requirements and drainage before pour day.
- Unexpected fill or poor bearing ground changes excavation and base design.
Check the business, client, property, dates, line extensions and notes. The concrete shed base installation PDF example shows one way to present them. Its short PDF note lists the brief's scope exclusions; the fuller project limits above should guide your own scope.
Questions about this estimate
Which quantity controls this concrete shed base installation estimate?
Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness.
When should this concrete shed base installation quote be revised?
Unexpected fill or poor bearing ground changes excavation and base design. No shed assembly, electrical supply or engineered foundation.
MAKE THE NEXT ESTIMATE YOUR OWN
Build a concrete shed base installation estimate.
Enter the job scope in Estimates on iPhone or Android or start from an AI-assisted draft. Check every quantity, rate, allowance, client detail and note before exporting the PDF. Some app features may require an in-app purchase.
