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Builders in Hertfordshire

29 practices covering Hertfordshire. Listings are business information researched by Renovome; contact details and matching happen inside Workspace.

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Appointing a builder in Hertfordshire

Hertfordshire builders handle rear and wrap-around extensions, loft conversions and refurbishments, often for commuter households wanting a fixed programme. Ask for a written programme alongside the quote.

Property you'll be working with in Hertfordshire

Interwar and post-war semis and detached houses in St Albans, Watford and Hitchin, Victorian terraces in town centres, and period property in the villages.

Planning in Hertfordshire

Extensive Green Belt limits extension volumes, and St Albans, Hertford and many villages have conservation areas with roof and frontage controls.

What builders charge in Hertfordshire

£2,500 to £3,500 per square metre for a mid-finish extension shell in 2026, and £1,100 to £1,900 per square metre for a full refurbishment.

Indicative 2026 ranges and local context, not quotations or planning advice. Last reviewed: September 2026.

How to choose a builder in Hertfordshire

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.

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

What builders in Hertfordshire 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

ItemTypical 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.

Read next

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