Check a Builder's Quote: Is the Price Fair Before You Sign?

You have finally received the quote for your extension, renovation, new roof or bathroom. You look at the total: £18,500. Or perhaps £47,000. Maybe £125,000. And one question immediately comes to mind: Is this builder’s quote reasonable?

It is one of the most difficult questions for a homeowner to answer. Building prices vary considerably across the UK. A quotation that looks expensive may actually be perfectly reasonable. Another quotation that looks like a bargain could be missing thousands of pounds of essential work.

Before signing anything or paying a deposit, it is worth taking the time to check your builder’s quote properly.

What Should a Builder’s Quote Include?

A professional building quote should be much more than a single price at the bottom of a page. Citizens Advice recommends obtaining written quotations and, where possible, comparing quotes from at least three different traders.

• the work being carried out
• the materials required
• separate costs where appropriate
• the total agreed price
• whether VAT is included
• how long the quotation remains valid
• circumstances in which the price could change

The Federation of Master Builders also recommends detailed written quotations and stresses the importance of comparing quotations on a like-for-like basis. If one builder quotes £32,000 and another £41,000, it does not necessarily mean that the second builder is £9,000 more expensive. They may simply be quoting for different things.

Quote or Estimate? There Is an Important Difference

British homeowners should understand the difference between a quote and an estimate. An estimate is an approximate prediction of what the work is likely to cost. Citizens Advice describes a quote as a promise to carry out the agreed work for an agreed price. Once accepted, a quote generally creates a binding agreement.

There can be legitimate reasons for additional charges—for example, if you request extra work or unforeseen work becomes necessary and you agree to pay for it. This is why checking exactly what is included before signing is so important.

How Much Should a Builder Cost in the UK in 2026?

There is no single correct builder price. Current UK market guides provide useful benchmarks. Typical market ranges can include approximately:

Trade

Indicative day rate

General builder

£150–£400

Bricklayer

£240–£320

Carpenter

£240–£360

Plasterer

£200–£350

Painter & decorator

£150–£350

Electrician

£250–£480

Plumber

£250–£480

Roofer

£200–£360

Labourer

£112–£360

These are guideline ranges, not fixed national tariffs. Location, qualifications, demand and complexity can all affect the price.

Building Costs per m² in the UK

House Renovation Cost per m²

Current UK market guidance places renovation costs broadly around £650–£2,800 per m² depending on the scale, specification and complexity of the project. A basic cosmetic renovation will cost far less than a full strip-out and rebuild.

Extension Cost per m² UK 2026

A typical single-storey extension can fall around £1,800–£3,500 per m². Foundations, structural steel, glazing, roofing, insulation, kitchens, plumbing, electrical work, access and finishes can move the figure significantly.

How Much Does a House Renovation Cost in 2026?

Recent UK cost guides place a typical three-bedroom house renovation in a very broad range of roughly £43,530–£110,350, depending on the work required.

Rewiring: £4,000–£8,500

New heating system: £3,000–£8,500

New kitchen: £7,000–£25,000

New roof: £6,500–£18,000

Painting walls and ceilings: £5,000–£7,000

Is My Builder Quote Too High?

Imagine that you receive three quotations for the same extension: Builder A: £48,000; Builder B: £57,500; Builder C: £69,000. Which builder is too expensive? You cannot answer that question from the totals alone.

Builder A may have excluded VAT, waste disposal, scaffolding, electrical work, painting, floor finishes, Building Control costs, structural steel or kitchen installation. Builder C may have included all of them. Suddenly the £69,000 quotation may actually be more competitive.

Is a Cheap Builder Quote a Good Sign?

Not necessarily. A quote significantly below competing quotations should be investigated just as carefully as an expensive quote. It may be legitimate, but it can also indicate missing work, underestimated labour, cheaper materials, excluded waste, VAT or subcontractor costs.

Check Whether VAT Is Included

Imagine two quotations: Quote A: £40,000 including VAT. Quote B: £36,000 + VAT. At first glance Quote B looks £4,000 cheaper. Adding 20% VAT gives £43,200. Quote A is actually cheaper. Never assume that the number at the bottom includes VAT.

Check Materials Carefully

The words “supply and install windows” are not enough. Which manufacturer? Which profile? Double or triple glazing? What thermal performance, hardware and installation method? The same principle applies to insulation, roof tiles, bricks, flooring, plasterboard, boilers, heat pumps, electrical equipment, sanitaryware and kitchens.

Check Quantities

One of the most overlooked parts of a builder quote is quantity. If the actual roof area is around 125 m² but the quotation charges for 158 m², the difference deserves an explanation. Check m², m³, linear metres, hours, days and units. A reasonable unit price can still produce a wrong total if the quantity is wrong.

Check the Price per m²

Breaking a quotation into unit prices can reveal anomalies. A roofing price of £325/m², tiling at £115/m², painting at £48/m² or insulation at £190/m² should not automatically be labelled expensive. First establish exactly what preparation, materials, labour, waste, scaffolding, finishing and VAT are included.

London Is Not Belfast

Location matters enormously. Indicative builder day rates published in UK market guides show substantial regional differences, with London and parts of the South East often sitting well above cheaper regions. Local labour availability, parking, transport, property prices and demand all influence quotations.

Example location

Indicative builder day rate

London

~£233/day

Edinburgh

~£232/day

Glasgow

~£223/day

Manchester

~£196/day

Birmingham

~£194/day

Cardiff

~£188/day

Belfast

~£136/day

Beware of Missing Costs

• Scaffolding and access equipment
• Waste removal and skip hire
• Structural steel and structural work
• Electrical installation and certification
• Plumbing fixtures and installation
• Decoration and final finishes
• Making good after electrical and plumbing work
• Building Control and professional fees
• VAT

How Much Contingency Should You Allow?

Renovation is vulnerable to unexpected discoveries such as rotten timber, damp, old wiring, damaged drainage, weak foundations, asbestos or structural problems. UK cost guides commonly suggest keeping a contingency of around 10–20%, depending on the project and its uncertainty.

Should You Compare Three Builder Quotes?

Yes. Citizens Advice recommends trying to obtain written quotations from at least three different traders. But comparison only works if the same specification is being priced.

• PRICE
• QUANTITIES
• MATERIALS
• LABOUR
• VAT
• TIMESCALE
• EXCLUSIONS
• PAYMENT TERMS
• INSURANCE
• GUARANTEES
• EXTRAS

Builder Quote Red Flags

• The quotation is extremely vague
• Materials are not properly specified
• There is no clear project description
• The builder refuses to provide a written quote
• VAT is unclear
• Payment terms are unclear
• An unusually large payment is requested upfront
• The price is dramatically lower than competing quotes
• Essential work appears to be missing
• No completion schedule is given
• Extras can apparently be charged without prior approval

Do Not Choose a Builder on Price Alone

The Federation of Master Builders advises homeowners not to choose purely on price. Experience, references, insurance, previous projects, qualifications, financial stability and reputation matter too. Saving £5,000 on a £100,000 renovation is not a saving if correcting defective work later costs £25,000.

What Happens if the Builder Wants More Money?

If you accepted a genuine quote, the trader generally cannot simply charge more than the quoted price without a valid reason. Additional charges may be legitimate when extra work becomes necessary and you agree to it, or when you request changes. Variations should ideally be documented and approved in writing before the additional work is carried out.

A £100,000 Quote Can Be Fair – and a £70,000 Quote Can Be Expensive

A builder’s quote cannot be properly judged from the final number alone. A £100,000 quotation can represent excellent value if it contains everything required. A £70,000 quotation can be expensive if another £40,000 of essential work will eventually be added.

The real question is: “Is this price reasonable for exactly what this builder is proposing to supply and build?”

Check Your Builder Quote Before You Sign

This is precisely the problem ECV – Euro Construct Verify is designed to address. A homeowner should be able to understand a building quotation before committing tens or even hundreds of thousands of pounds.

ECV analyses a quote to help identify points requiring attention, including the coherence of prices, quantities, technical descriptions and other elements of the proposed work. Checking a quote is not simply about finding the cheapest builder. It is about understanding what you are buying, whether the price makes sense and what may be missing before you commit.

UK References

• Citizens Advice – guidance on building work, written quotations, estimates, price changes and comparing traders.
• Federation of Master Builders (FMB) – guidance on choosing a builder, detailed quotations, scope, insurance and contractual terms.
• Checkatrade – 2026 cost guides for builder day rates and renovation benchmarks.
• MyBuilder – 2026 price guides for builder day rates, regional differences, renovation and extension costs.

Prices in this article are indicative UK market ranges rather than fixed tariffs. Actual prices vary according to location, specification, materials, property, access, complexity and contractor.

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