How to Read a Builder's Quote (Without Getting Lost)
A plain-English guide to understanding construction quotes - what each section means, red flags to watch for, and how to compare like-for-like.
You've requested quotes from three builders. They arrive as PDFs - different formats, different layouts, wildly different totals. How do you even begin to compare them?
In short: Check the scope of works covers everything you discussed, verify the price breakdown (labour vs materials), confirm start and end dates, review the payment schedule, and read the exclusions list carefully. If anything is missing, ask before you sign.
This guide breaks down the anatomy of a typical builder's quote so you can read each section with confidence and spot the gaps before you sign. For a full checklist of what should be there, see what a builder's quote should include.
What a quote should include
A professional quote is more than a single number. First, make sure you actually have a quote, not just an estimate - the legal difference matters. At minimum, expect:
- Scope of works - a written description of every task the builder will carry out
- Material specifications - brand, model, or at least grade (e.g. "softwood joists" vs "engineered I-joists")
- Labour and material costs - ideally separated, though lump-sum quotes are common
- Preliminaries - scaffolding, skip hire, site welfare, insurance
- Exclusions - what the quote does not cover (this is where surprises hide)
- Provisional sums - allowances for items not yet fully specified (common for kitchens, bathrooms, landscaping)
- Payment schedule - staged payments tied to milestones, not calendar dates
- Validity period - how long the price holds (typically 30–90 days)
Breaking down each section
Scope of works
This is the most important section. Read it line by line. If something you discussed during the site visit isn't listed, it's not included - no matter what was said verbally.
A quote is a legal document. If the scope says "install kitchen units" but doesn't mention plumbing or electrics, those are extras.
Preliminaries
Prelims typically run 8–15% of the project cost. They cover the boring-but-essential items:
| Item | Typical cost |
|---|---|
| Scaffolding | £800–£2,500 |
| Skip hire (per skip) | £250–£400 |
| Site toilet | £80–£120/week |
| Site insurance | £300–£800 |
| Temporary electrics | £200–£500 |
If prelims aren't listed, they're either buried in the labour rate or - worse - they'll appear as extras later.
Exclusions
Always check what's excluded. Common exclusions that catch homeowners out:
- Building regulations fees - the builder assumes you'll pay the council directly
- Party wall agreements - surveyor fees can run £700–£1,500 per neighbour
- VAT - if the builder is VAT-registered, 20% gets added on top
- Utility diversions - moving a gas main is expensive and slow
- Decoration - many builders exclude final painting and decorating
- Landscaping - reinstating the garden after an extension is rarely included
Red flags to watch for
- No written exclusions - if nothing is excluded, everything is "assumed included" which means disputes later (see our Red Flags in Builder Quotes for more)
- Vague material specs - "supply and fit bathroom" tells you nothing about quality
- Front-loaded payment schedule - if 50% is due before ground works finish, that's a risk
- No fixed price or validity date - a "budget estimate" is not a quote
- Dramatically lower than others - usually means a thinner scope, not a better deal. Check our guide on whether your quote is too high for benchmarks
Comparing quotes like-for-like
The trick is normalisation. When you have three quotes with different formats:
- List every work item from the most detailed quote - our Budget Planner can help structure this
- Check whether the other quotes cover the same items
- Mark gaps - these explain the price differences
- Ask builders to re-quote missing items so you can compare apples to apples
This is exactly what MyBuildAlly's AI analysis does automatically. Upload your quote and we'll flag scope gaps, check pricing against regional benchmarks, and highlight anything that looks unusual.
What to do next
When reviewing the scope, pay particular attention to any technical specifications. Our guide to key building regulations measurements lists the numbers your builder should be hitting - insulation thickness, foundation depth, DPC height - so you can check whether the quote matches what the regulations require.
If you'd rather not do this yourself, read our guide on free vs paid quote checking options. Or if you want a quick answer now, upload your quote for a free analysis and get an independent second opinion in minutes - not days.