How to Price Planning Works Profitably: A Builder's Estimating Guide
2026-08-25 · 8 min read
Pricing building work so you win the job and protect your margin - building an estimate from first principles, handling the price conversation, and the mistakes that quietly destroy builder margins.
The estimate is the business plan for the job
A building estimate is not a number you hope will cover the job - it is a plan for how you will make money on it. Every line item represents a cost you have priced, a risk you have considered, and margin you have protected. The builders who go bust usually do so on profitable-looking jobs that were underestimated.
Pricing well is what lets you win planning leads confidently: when you know exactly what a job costs, you can quote fast and stand behind the number.
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Build the estimate from first principles
Start from the drawings and specification, not from last time. Break the job into its real parts and price each one from your records:
- Labour - real crew days at your full cost, not a daily rate that excludes overheads
- Materials - with a sensible waste allowance
- Plant, hire and delivery
- Subcontractors - priced from written quotes
- Skip, waste and access
- Statutory fees and insurance
- Contingency - typically 5-10%
- Your overheads and target profit
The discipline of itemising every part is what catches the costs that quietly destroy margins.
Use benchmarks to quote faster
Track your own benchmarks so future quotes are faster and more accurate. After each job, note the price per square metre, per crew day, and per project type. Over time you build a reliable reference for extensions, conversions and new builds that lets you estimate in minutes, not days.
| Project type | Typical price per m² (rough build) | Key cost drivers |
|---|---|---|
| Single-storey extension | £2,000 - £3,500 / m² | Groundworks, roof, finishes |
| Two-storey extension | £2,200 - £3,800 / m² | Structure, scaffolding, services |
| Loft conversion | £35,000 - £60,000 fixed | Dormer, stairs, fire safety |
| Kitchen extension / refurb | £1,800 - £2,800 / m² | Fittings, plumbing, electrics |
Benchmarks are a starting point - every job is priced from its own details.
Handle the price conversation with confidence
Present the quote clearly and stand behind it. Explain what is included, what is not, and how variations will be handled. When a customer pushes back, invite comparison rather than discounting: "what did the other quote include?" More often than not, the difference is scope, not price.
A confident, transparent price is a competitive advantage. It signals a professional who has thought the job through - exactly the builder a homeowner wants on their extension.
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Protect your margin through the project
The estimate sets the price, but margin is protected during delivery. Agree variations in writing before doing extra work, keep a change log, and invoice against a clear schedule. The builders who lose margin rarely lose it at pricing - they lose it on uncontrolled extras and variations.
Combine disciplined pricing with disciplined delivery and the projects you win on planning leads become the projects that grow your business.
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Frequently Asked Questions
How do I price a building job I have never done before?
Break it into known parts - labour, materials, plant, subbies, overheads, contingency - and price each from your records. Unknown tasks deserve a line item and a contingency, not a hopeful number. If you cannot price a part, that is a reason to get a quote, not a guess.
What is a healthy margin on building work?
Net profit of 15-25% on well-run projects is a realistic target after all costs and overheads. Many builders quote on cost-plus-a-small-markup and discover too late that overheads and variations ate the margin. Price the job to make the business sustainable.
How do I handle "the other builder is cheaper"?
Stay calm, explain what your price includes, and ask what theirs covers. Quality builders win on clarity and completeness, not on matching the lowest number. Offer to adjust scope rather than price if needed.
What should I always include in a quote?
Labour, materials with a small allowance for waste, plant hire, skip and waste removal, statutory fees, access and protection, and a contingency. Itemise clearly so the customer sees value - and so variations are easy to agree later.