How to Compare Builder Quotes: A Practical Checklist
Three builders can return three different totals without pricing the same job. One includes demolition and waste, another leaves decorating out, and the third uses provisional allowances for key materials. Choosing from the bottom line alone can turn the cheapest quotation into the most expensive project.
The solution is to send every builder the same clear brief, then compare scope, assumptions and risk before price. This guide uses consumer guidance for England and Wales as its main example. Contract and building rules vary elsewhere in the UK, so check the guidance where your property is located.
Give every builder the same brief
Write the scope before requesting prices. Include drawings, photographs and dimensions where they help. State what is changing, what must remain, the quality you expect and your preferred timing.
Your pricing brief should cover:
- the room, dimensions and current condition
- drawings and photographs of the existing space
- the exact work required and anything specifically excluded
- named products or a measurable quality level for important materials
- who buys, receives and stores materials
- protection, access, cleaning, skips and waste removal
- target start and completion dates
- approvals, inspections and handover documents expected
Send the same version to everyone. If one builder has more information than another, the results are not a fair comparison.
Compare these lines, not just the total
Citizens Advice recommends written quotations and says the document should identify the work, materials, separate costs, validity period, VAT treatment and circumstances in which the price can change.
| Check | What you need to find |
|---|---|
| Price type | Fixed quotation, estimate, day rate or cost-plus arrangement |
| Total | Whether VAT, fees and delivery are included |
| Scope | A clear list of every operation being priced |
| Materials | Product, quantity, quality and who supplies it |
| Enabling work | Demolition, protection, scaffolding, skips and cleaning |
| Other trades | Electrician, plumber, designer and subcontractors |
| Allowances | Provisional sums and what happens if they are exceeded |
| Programme | Start date, duration, completion date and dependencies |
| Payment | Deposit, stage payments and the milestone for each payment |
| Handover | Snagging, certificates, warranties, manuals and photographs |
Ask for missing information in writing. The answer may become part of the agreement, so store it with the original quotation.
Quote or estimate: know the difference
A quotation is an offer to carry out the described work for an agreed price. Citizens Advice explains that a trader generally cannot increase it merely because their own costs rise. The price can change where you agree extra work, where an unforeseen item is identified and you agree to pay for it, or in limited circumstances such as an obvious genuine mistake.
An estimate is a best guess, not a fixed total. It can be appropriate when the condition behind a wall or floor cannot be known in advance, but the uncertainty should be named and bounded as far as possible.
For a day-rate job, ask how many hours count as a day, the expected number of days, rates for different people, material mark-ups and when the builder must obtain approval before using more time.
Do not compare a fixed quotation directly with an open estimate without accounting for the different risk you are accepting.
Normalise the quotations
Create one comparison sheet with each builder in a separate column:
- Enter the quoted total.
- Add every necessary item that is missing from that quotation.
- Keep firm prices separate from provisional allowances.
- Highlight assumptions that could materially change the final cost.
- Record work you must buy, coordinate or complete yourself.
A £34,000 quotation can represent better value than a £30,000 quotation if the first includes electrics, waste, decorating and completion certificates while the second excludes all four. The point is not to invent a perfectly adjusted price. It is to make uncertainty visible before you commit.
Look for gaps and vague wording
Ask a follow-up question when you see wording such as:
- “all necessary work” without a defined list
- “standard fittings” without products or allowances
- “electrics extra” without a budget or responsible contractor
- “subject to site conditions” without an approval process
- “completion to be agreed” without a programme
- a large upfront payment unrelated to ordered materials or completed work
A very low quotation is not automatically wrong. It is a prompt to check whether the scope, material quality and trade involvement genuinely match the others.
Check the builder behind the quotation
Ask for two or three recent examples of similar work and contact the clients where possible. Verify memberships, competent-person registrations and trade credentials directly with the scheme named, rather than relying on a logo in a document.
Ask which insurance policies apply and check that the cover will remain current for the project. Depending on the work and business, relevant cover can include public liability, employers' liability and professional indemnity for design services. Speak to your own buildings insurer before substantial work begins too.
Clarify who will actually attend site. If subcontractors are involved, the contract should say who coordinates them, who you communicate with and who remains responsible for the finished work.
Score value, confidence and communication
Use a simple score from 1 to 5 for each area:
- complete understanding of the scope
- clear price with few unexplained allowances
- realistic programme
- relevant experience, references and registrations
- precise, timely communication
- sensible payment, variation and handover process
Weight the categories for your project. Price may dominate a simple decorating job. For a bathroom, structural alteration or whole-house renovation, coordination, controlled work and documentation deserve greater weight.
Before accepting a quotation
Put the final scope into a written contract. Include start and finish dates, payment stages, site responsibilities, the process for delay and variations, and the documents due at completion.
Agree that variations require a written description, price and effect on the completion date before the extra work proceeds. Avoid paying the whole project upfront. Where a deposit is genuinely needed for ordered materials, document what it covers and obtain a receipt.
Keep the accepted quotation, contract and every approved variation together. At completion, use our renovation documentation checklist to close the project properly.
Frequently asked questions
How many builder quotes should I get?
Citizens Advice recommends trying to obtain at least three written quotations. For a specialist job the available pool may be smaller, but every bidder should still receive the same brief.
Is the cheapest builder quote usually best?
No. First check that scope, materials, VAT, other trades, waste, decorating and handover documents are comparable. A low price can be good value, but only when the omissions and risks are understood.
Can a builder charge more than a quotation?
Not simply because their own costs increased. The price can change if you request extra work, if additional necessary work is explained and you agree to pay for it, or in limited cases such as an obvious genuine error. Record every change in writing.
What should a builder quote include?
It should clearly identify the work and materials, separate costs where useful, the total and VAT treatment, how long the price remains valid, the programme, payment terms, exclusions and the circumstances in which the price may change.
Sources
- Citizens Advice: Before you get work done on your home
- GOV.UK: Use a competent person scheme
- GOV.UK: Buying green heating and insulation products