How to Get Builder Quotes: A Guide to Pricing
Get accurate, comparable builder quotes for your extension or renovation. How many to get, what to check, red flags, and comparing like for like.
Getting builder quotes is one of the most important - and most stressful - parts of any home improvement project. Get it right and you'll have a clear budget, a reliable builder, and a smooth build. Get it wrong and you'll face cost overruns, delays, and disputes.
This guide shows you how to get quotes that are accurate, comparable, and fair.
Before You Contact Any Builders
1. Know What You Want
The more detailed your brief, the more accurate your quotes will be. Before approaching builders, prepare:
- Drawings or sketches - ideally from an architect or architectural technologist (£1,500–£5,000). Even rough sketches with dimensions help.
- A written specification - materials, finishes, fixtures you want. "Standard white bathroom suite" is better than "a bathroom."
- A clear scope - what's included in the build and what's separate (kitchen supply, decoration, landscaping).
Without clear drawings and a spec, builders are guessing - and their guesses will vary wildly, making comparison impossible.
2. Get a Baseline Estimate
Before you speak to builders, get an independent cost estimate to calibrate your expectations. Our free quote calculator gives you an itemised breakdown based on your location, project type, and finish level. This isn't a builder's quote - it's a data-backed starting point so you know whether the quotes you receive are in the right ballpark.
How to Find Good Builders
Personal Recommendations
The single best source. Ask neighbours, friends, and family who've had similar work done recently. Visit the completed work if you can - photos don't tell the full story.
Trade Bodies
Members of recognised trade bodies have been vetted and must meet minimum standards:
| Organisation | What It Means |
|---|---|
| FMB (Federation of Master Builders) | Vetted, insured, inspected regularly |
| TrustMark | Government-endorsed quality scheme |
| NHBC | Primarily new builds, but indicates high standards |
| Checkatrade | Verified reviews and background checks |
| MyBuilder | Homeowner reviews, competitive quoting |
What to Check Before Inviting to Quote
- Public liability insurance - minimum £2 million (ask to see the certificate)
- Employer's liability insurance - if they have employees
- Examples of similar completed work - ideally with references you can contact
- A fixed business address - not just a mobile number
- Company registration - check Companies House for limited companies
Getting Comparable Quotes
The golden rule: every builder must quote against the same specification. If one builder is quoting for a flat roof and another for a pitched roof, the quotes aren't comparable.
What to Send to Each Builder
- Architectural drawings - floor plans, elevations, sections
- Written specification - materials, window types, heating, electrics, finishes
- Site visit - every builder should visit in person. Never accept a quote based solely on drawings.
- Clear exclusions - tell them what you're handling separately (kitchen units, decoration, landscaping)
What the Quote Should Contain
A professional quote includes:
- Itemised cost breakdown - foundations, structure, roof, windows/doors, electrics, plumbing, plastering, etc.
- Labour and materials split (or at least separated by trade)
- Clear scope description - what's included and what's not
- Provisional sums - allowances for items not yet specified (e.g. "£3,000 provisional for kitchen tiling")
- Start date and estimated completion date
- Payment schedule - tied to stages of work, not calendar dates
- Warranty/guarantee details - what's covered and for how long
- VAT status - inclusive or exclusive, and whether the builder is VAT-registered
Red Flag Quotes
Walk away from quotes that:
- Are a single figure with no breakdown
- Don't specify what's included or excluded
- Have no start or completion dates
- Don't mention VAT
- Arrive without a site visit
- Seem dramatically lower than others (often means they'll add extras during the build)
Comparing Quotes: A Practical Framework
Once you have 3+ quotes, create a comparison table:
| Item | Builder A | Builder B | Builder C |
|---|---|---|---|
| Foundations | £8,000 | £7,500 | £9,000 |
| Structural walls | £12,000 | £11,000 | £12,500 |
| Roof | £6,000 | £5,500 | £7,000 |
| Windows/doors | £4,000 | £3,800 | £5,500 |
| Electrics | £3,000 | £2,500 | £3,200 |
| Plumbing | £2,500 | £2,000 | £2,800 |
| Plastering | £2,000 | £1,800 | £2,200 |
| Decoration | Excluded | £1,500 | Excluded |
| Scaffolding | Included | £1,200 | Included |
| Skip hire | Included | £800 | £600 |
| Subtotal | £37,500 | £37,600 | £42,800 |
| VAT (20%) | £7,500 | £0 (not registered) | £8,560 |
| Total | £45,000 | £37,600 | £51,360 |
Notice how Builder B appears cheapest but isn't VAT-registered (turnover under £90,000 - potentially a less established business) and excludes scaffolding and skips. Once you normalise the comparison, the gap narrows.
Always compare total cost for the same scope of work, including VAT.
The Contract
Never start work without a written contract. It should include:
- Full scope of work (attach the drawings and specification)
- Total price (or schedule of rates if the scope may change)
- Payment schedule tied to milestones
- Start and completion dates, with provisions for delays
- Defects liability period (typically 6–12 months)
- Dispute resolution process
- Insurance requirements
The FMB and JCT (Joint Contracts Tribunal) both publish standard homeowner contracts that protect both parties. The JCT Homeowner Contract costs around £30 and is widely used.
Payment Schedule Best Practice
| Stage | % of Total | Trigger |
|---|---|---|
| Deposit | 10% | Contract signed |
| Foundations complete | 15% | Inspected by Building Control |
| Wall plate / structural frame | 20% | Walls up, steelwork in place |
| Roof watertight | 15% | Roof on, building weathertight |
| First fix complete | 15% | Electrics, plumbing, plastering done |
| Second fix and completion | 15% | Finished, snagged |
| Retention | 10% | Released after 3–6 months defects period |
Key rule: Never pay ahead of the work completed. If a builder asks for stage 3 payment before stage 2 is finished, something is wrong.
Negotiating
It's reasonable to negotiate, but do it respectfully and based on evidence:
- Point to specific line items where another builder is cheaper - "Builder B quoted £3,800 for windows; can you sharpen your £5,500?"
- Don't squeeze margins too hard - a builder working at cost will cut corners or walk off the job
- Negotiate scope, not just price - "Could we use a flat roof instead of pitched to save £2,000?"
- Ask about timing discounts - some builders offer lower rates for work starting in quieter months (January–March)
Next Steps
- Get a baseline estimate - use our free extension calculator or repair estimator
- Prepare drawings and a spec before contacting builders
- Get 3+ written quotes against the same specification
- Compare like for like - normalise for VAT, exclusions, and provisional sums
- Check references - visit a completed project if possible
- Use a proper contract - JCT Homeowner or FMB standard contract
- Read about hidden costs so you budget for everything outside the builder's quote
Frequently Asked Questions
Ready to Get a Quote?
Use our free calculator to get a personalised, itemised estimate for your project - tailored to your location and specification.