What Your Builder's Quote Isn't Telling You

A builder’s quote can look reassuringly professional. A logo at the top. Your address. A list of works. A total at the bottom. £24,850 + VAT. Everything looks fine. But here is the question homeowners should be asking: What isn’t written on the quote?

Because when a building project goes over budget, the problem is not always that the prices shown on the original quotation were excessive. Sometimes the real problem is everything that was missing, vague, provisional or open to interpretation.

In 2026, checking a builder’s quote should therefore mean much more than searching online to see whether £200 per m², £300 per day or £15,000 for a bathroom ‘sounds about right’. It means reading the quotation as if it were a map of the project — and looking carefully for the blank spaces.

The £38,000 Question

Imagine you are renovating part of your house. One builder sends you this: Kitchen extension and associated works – £38,000 + VAT. It sounds straightforward. But what exactly are you buying for £38,000? Are the foundations included? Structural steel? Insulation? Drainage? Electrics? Plumbing? Plastering? Flooring? Painting? Waste removal? Building Control requirements? Kitchen fitting? Making good? Suddenly, £38,000 tells you remarkably little. A quotation is only useful when the scope behind the number is clear. The Federation of Master Builders (FMB) recommends detailed written quotations and advises homeowners to check carefully what is and is not included rather than choosing a builder simply because their total is lower.

The Most Expensive Word in a Builder’s Quote Could Be ‘Extra’

Consider this sentence: ‘Any additional works will be charged as extras.’ It sounds harmless. But what counts as additional work? A subfloor needing attention, a pipe needing moving, additional electrical work or extra preparation can all become extras. Additional work is sometimes genuinely unavoidable. The important issue is how those surprises are dealt with financially. Before signing, ask how variations are priced, who must approve them, whether you receive the price before work starts and whether written approval is required. Citizens Advice explains that where a homeowner has accepted a genuine quote, a trader generally cannot simply charge more unless there is a legitimate reason, such as additional work agreed by the customer.

Quote or Estimate? One Word Can Change Everything

ESTIMATE – £52,000 and QUOTATION – £52,000 may look similar, but they are not necessarily the same financially. Citizens Advice distinguishes an estimate — the trader’s best assessment of likely cost — from a quote, which represents an agreed price for specified work. Citizens Advice recommends getting a quote rather than an estimate. So before asking whether the amount is fair, establish what document you have actually received.

The Missing Specification Test

Take one important item and ask: could another builder understand exactly what has to be supplied from this description alone? ‘Install insulation’ is not much of a specification. What insulation, thickness, location, thermal performance and manufacturer or equivalent standard? ‘Supply and install windows’ raises the same questions: PVC, aluminium or timber? Double or triple glazing? U-value? Security specification? Colour? Internal and external finishes? Removal and disposal? The fewer details a quotation contains, the more room there may be for disagreement later.

Beware of the Magic Word: ‘Allowance’

You might see ‘Bathroom sanitaryware allowance: £2,500’ or ‘Kitchen allowance: £8,000’. This is not necessarily wrong, but understand what it means. If the actual kitchen costs £13,500, the additional £5,500 comes from your pocket. Allowances can make the initial total look attractive while leaving significant expenditure unresolved. Identify every allowance and ask whether it is realistic for the quality you expect.

‘By Client’ – Two Innocent Words Worth Thousands

Search your quotation for ‘by client’. Sanitaryware, tiles, kitchens, light fittings or decoration listed this way may not be included in the builder’s total. A £70,000 quotation containing £25,000 of client-supplied items is very different from a £78,000 quotation that includes everything. The lowest total is not necessarily the lowest final project cost.

Provisional Sums Deserve a Highlighter

A provisional sum may be necessary when the precise scope cannot yet be determined, but it introduces uncertainty. If drainage works carry a provisional sum of £2,500 and the final work costs £6,800, that one line adds £4,300. A quotation containing many provisional sums deserves closer analysis because a significant proportion of the supposedly agreed budget may not really be fixed.

Compare Exclusions Before Comparing Prices

Most homeowners compare what builders include. Try the opposite: compare what they exclude. Builder A: £61,000. Builder B: £68,000. Builder C: £73,000. If A excludes decorating, waste, flooring and final electrical fittings, B excludes flooring, and C includes all of them, the ranking changes. The FMB recommends like-for-like comparisons and querying anything you do not understand. A useful rule: the shorter the price, the longer your questions should be.

A Builder Quote Is Also a Test of the Builder

A detailed quotation may indicate that the contractor has thought carefully about labour, quantities, materials, sequencing, subcontractors, waste, access, timings, payment and complications. A three-line quotation with a £90,000 total provides less evidence of planning. That does not automatically make the builder unreliable, but clarification is reasonable. The FMB says professional quotation documentation should set out labour, materials, costs, timelines, payment terms and inclusions and exclusions.

Don’t Just Check the Builder. Check the Quote.

Homeowners often research Google reviews, social media, photographs, recommendations and previous customers. All useful. But a builder with excellent reviews can still produce a quotation that does not suit your project. The questions ‘Can I trust this builder?’ and ‘Is this quotation technically and financially coherent?’ are different. You need an answer to both. The FMB recommends checking relevant experience, references, credentials and insurance as well as obtaining detailed quotations.

The Payment Schedule Can Reveal Risk

Suppose a £100,000 project requires £40,000 before work begins, £40,000 after week two and £20,000 on completion. By week two you may have paid 80% of the contract value. Has 80% of the work actually been completed? A milestone-based structure can link money more closely to progress. There is no universal schedule for every project, but payments and the value of completed work should not become dangerously disconnected. The FMB recommends agreeing payment terms in advance and warns against handing over the entire project cost at the outset.

Cash Is Not a Discount if You Lose the Evidence

A builder might offer £18,000 by bank transfer or £16,500 cash. The apparent saving may be attractive, but consider what evidence remains. Keep quotations, invoices, bank records, emails, messages, variations and photographs. If a disagreement arises months later, evidence is more useful than memory.

Is the Builder Actually Responsible for Everything in the Quote?

Many projects involve builders, electricians, plumbers, roofers, engineers, architects, kitchen fitters, window companies and scaffolders. Who is contracting with whom? If a subcontractor does not turn up or costs rise, who is responsible? The FMB recommends written contracts that clearly identify responsibilities, project documents, payment arrangements, warranties, timescales and relevant subcontracting issues. A quotation may look like a price document; in reality, it begins a chain of responsibilities.

‘Approximately 8 Weeks’ – Starting When?

‘Duration: approximately 8 weeks.’ Eight weeks from signing, deposit, material delivery, approvals or the first day on site? What happens if it becomes 16 weeks? Before signing, establish the expected start date, duration, milestones and circumstances that can extend the programme. The FMB recommends agreeing project timelines and including relevant timing provisions in the written contract.

The VAT Trap

A quotation of £50,000 + VAT is not a £50,000 project where the standard 20% VAT rate applies. It is £60,000. Always establish whether VAT is included, excluded or not applicable. Citizens Advice specifically recommends checking whether VAT is included in the quoted price.

What if There Is No Fixed Price?

Sometimes a builder proposes labour at £300 per day plus materials. This can be appropriate where scope is difficult to predict, but it transfers more uncertainty to the homeowner. Citizens Advice advises establishing in writing how many days are expected, what constitutes a working day and when permission is required for additional days. For a large project, £300 per day is not a budget. You still need to know how many days.

Your Consumer Rights Do Not Disappear When Building Work Starts

The UK Consumer Rights Act 2015 provides important protection for consumers purchasing services. Government guidance explains that services must be carried out with reasonable care and skill. Where no exact price has been agreed, statutory principles concerning a reasonable charge can apply. Consumer law can also provide remedies when services do not meet agreed standards. Prevention, however, is usually preferable to solving a dispute after your home has become a building site.

The 60-Second Builder Quote Test

Before signing, see whether you can quickly answer: What exactly is being built? What materials are supplied? What is excluded? Is VAT included? Which amounts are provisional? Who pays for waste and scaffolding? Who supplies fixtures? How are extras authorised? When do I pay? When should the project start and finish? What happens if something changes? If several answers are unclear, the quotation deserves another look.

The Cheapest Quote Can Be the Most Expensive Decision

Imagine quotations of £74,000, £82,000 and £91,000. The natural reaction is to focus on £74,000. But if final costs become £104,000, £86,000 and £93,000, the cheapest quote was never the cheapest project. Stop asking only which builder quoted the lowest price. Ask which quotation gives the clearest and most realistic picture of what the project will actually cost.

Why ECV Checks the Quote Before the Signature

This is the idea behind ECV – Euro Construct Verify. By the time a dispute starts, the homeowner may already have signed, transferred a deposit, ordered materials and allowed work to begin. The best moment to identify questions is before the signature. ECV is designed to help analyse construction and renovation quotations and identify elements that deserve closer attention — such as prices, quantities, descriptions, technical coherence and potentially unclear aspects of the proposed work. It is not simply about finding the cheapest builder. It is about helping homeowners understand the document before it becomes a financial commitment.

UK Sources

• Citizens Advice – Before you get work done on your home. Guidance on written quotations, quotes versus estimates, VAT, comparing traders, insurance, contracts and additional charges.
• Citizens Advice – Problem with building work, decorating or home improvements. Guidance concerning agreed quotations and circumstances in which additional charges may be justified.
• Federation of Master Builders (FMB) – How to choose a trusted builder in the UK. Guidance on detailed written quotations, like-for-like comparison, credentials, insurance, contracts, payment schedules and project responsibilities.
• Federation of Master Builders – Building contracts and quotation templates. Guidance on documenting scope, labour, materials, costs, timescales, payment terms, inclusions and exclusions.
• UK Government – Consumer Rights Act 2015 and consumer protection guidance. Consumer rights concerning services, reasonable care and skill and remedies where services do not meet agreed standards.

Already have a quote? Don’t sign it before checking it on ecvcheck.com.