THE ESTIMATING ANSWER
Estimate concrete shed base installation by measuring the defined one detached garden shed pad, separating product allowances from labour and setting out the work sequence and exclusions. This fictional Leicester example uses 7 itemised lines totalling £2,549.23; its exact quantities and rates appear in the paired app PDF.
The worked job is one detached garden shed pad in Leicester. The written scope is: Build a level concrete base for a selected garden shed footprint with excavation, compacted base, edge forms and specified slab thickness. Its matching itemised example shows how that description becomes quantities, allowances and a PDF. These figures are fictional inputs for learning the method, so check the real site, specification and supplier or subcontractor costs before quoting.
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.
Measure for this job: Measure shed footprint plus required edge clearance; calculate concrete volume from area and design thickness. Record the measured basis next to the relevant cost lines, since a room count, fitted length and purchased product quantity may each use a different unit.
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.
Choose before pricing: Keep excavation, granular base, reinforcement allowance and concrete supply separate. Keep a named allowance when the selection is open, and replace it once the actual product and delivery terms are known.
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.
Plan the handoffs: Confirm shed supplier base requirements and drainage before pour day. State which stage needs access or inspection before the next can begin, especially if a concealed condition might stop the work.
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.
Change trigger: Unexpected fill or poor bearing ground changes excavation and base design. If this happens, write down the revised quantity and responsibility before adding an item to the customer estimate.
Worked project calculation
The paired PDF has 7 cost lines. For example, Excavation is 11.1 sq m × £43.10 = £478.41; Formwork is 13.4 metres × £18.35 = £245.89. Each amount is the stated quantity multiplied by its unit rate. Recheck whether a line describes installed work, a material purchase allowance or a distinct visit before changing its quantity.
| Work item | Quantity | Unit rate | Amount |
|---|---|---|---|
| Setting-out and protection | 1 lump sum | £132.00 | £132.00 |
| Excavation | 11.1 sq m | £43.10 | £478.41 |
| Base aggregate allowance | 1 lump sum | £248.00 | £248.00 |
| Formwork | 13.4 metres | £18.35 | £245.89 |
| Reinforcement allowance | 1 lump sum | £208.00 | £208.00 |
| Concrete supply | 1.5 cubic metres | £251.12 | £376.68 |
| Place and finish | 11.1 sq m | £77.50 | £860.25 |
| Illustrative total | £2,549.23 | ||
Adding the 7 exact line amounts gives £2,549.23. The PDF uses a 0% tax input and no markup solely to display this arithmetic. Decide the appropriate tax, overhead and profit treatment for an actual job; the fictional rates are not local averages or price recommendations.
Scope and price 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.
The role in this brief is general contractor. Confirm who supplies the selected products, makes the site safe, removes waste and signs off the work. Where opening up reveals a different condition, document it and issue a revised scope and price rather than silently extending the base estimate. Also check access, drying or curing time, and the client handoff described in the work sequence.
Before you send
- 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.
Compare the written scope with every line in the concrete shed base installation PDF example. The preview below is the first page of the actual app export; open the PDF to inspect its full scope, notes and amounts.
Questions about this job
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.
FROM SITE NOTES TO AN ITEMISED PDF
Build your own concrete shed base installation estimate
Enter the project boundary and your measured lines in Estimates on iPhone or Android. Edit the fictional quantities and rates, add the actual business and client details, then inspect the PDF before sharing it.
