Worked example
The notes
Mr & Mrs Okafor, Whitley Bay: “Rear kitchen extension 4m × 5m, strip foundations, cavity walls, flat roof with 2 rooflights, steel for knock through, first fix, plaster. 10 weeks.”
| Item | Qty | Unit price | Total |
|---|---|---|---|
| Groundworks and foundations | 1 stage | £6,200.00 | £6,200.00 |
| Superstructure: cavity walls to wall plate | 1 stage | £9,400.00 | £9,400.00 |
| Flat roof and 2 rooflights | 1 stage | £5,600.00 | £5,600.00 |
| Steel and knock through | 1 stage | £3,200.00 | £3,200.00 |
| First fix electrics and plumbing | 1 stage | £3,600.00 | £3,600.00 |
| Plastering | 1 stage | £2,400.00 | £2,400.00 |
- Subtotal
- £30,400.00
- VAT at 20%
- £6,080.00
- Total
- £36,480.00
Example prices for illustration only. Your prices depend on your area, the spec and access, so set your own.
Turn your own notes into a quote like this
Type the job how you'd say it. Workscribe lays it out, prices each line and works out the VAT. Free to try, no account.
Try it freeWhat a single storey extension quote should include
- Stages in build order with a price each
- Size, specification and what the client supplies
- Exclusions: planning, building control fees, engineer, party wall
- Programme in weeks
- Staged payments tied to completed work
- Contingency and how variations are handled
Common mistakes
No stage payments
Never fund a client's extension yourself. Tie payments to completed stages.
Thin exclusions
Ground conditions, services and building control fees should be listed so they don't land on you.
Questions
How do I break down an extension quote?
+
Stage it in build order: groundworks, superstructure, roof, first fix, plastering, second fix, finishes. Price each.
Should I include a contingency?
+
Many builders add a stated percentage for unknowns, especially below ground. Explain what it covers.
What's commonly excluded?
+
Planning and building control fees, structural engineer, party wall costs and anything the client supplies.
General guidance, not legal or technical advice. Check current regulations for your job.
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