Builders in the UK

Main contractors and building companies delivering extensions, refurbishments and conversions for homeowners.

1,993 listings across 32 areas.

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How to choose a builder

You appoint a builder once the scope is defined. If you invite builders before the drawings and specification are settled, every quote prices a different job and you cannot compare them.

Give every builder the same drawings, specification and programme, then compare line by line.
Check the company at Companies House, and ask how long the team has worked together.
Visit a current site, not just a finished photo.
Ask for public liability insurance and, where relevant, a warranty or guarantee.
Agree a payment schedule tied to stages completed, never a large payment up front.

What builders typically work on

Single and two-storey extensions
Loft conversions and garage conversions
Kitchen and bathroom refits
Structural openings and knock-throughs
Whole-house refurbishments

Typical 2026 fees for builders

Item	Typical 2026 cost
Extension shell, per square metre	£2,300 - £3,400
Single-storey rear extension, 20 sq m	£52,000 - £86,000
Loft conversion, rear dormer	£48,000 - £78,000
Structural opening with flush beam	£4,500 - £12,000
Day rate, two-person team	£380 - £620

Indicative 2026 UK ranges, not quotations. London and the South East usually sit at the top of each range. Last reviewed: September 2026.

Common questions

How many builders should I ask to quote?: Three is enough, provided all three price the same written scope. More quotes on a vague brief produce a wider spread, not better information.
Why do quotes for the same job differ so much?: Usually because they include different work. Compare the inclusions, exclusions and provisional sums before you compare the totals.

Let Renovome shortlist builders for you

Set up your project and Renovome matches you to suitable practices near you, then helps you brief them consistently and compare what comes back.

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