A brick built family home in St Albans, Hertfordshire

Hertfordshire, Harpenden

Bespoke home builders inHarpenden

Large plots, strong ceiling prices and a steady demand for serious extensions.

Federation of Master Builders
25 years, 100+ homes
Working in Harpenden and nearby
10 year structural warranty

Building in Harpenden

What working in Harpenden actually involves

Harpenden has been one of our busiest towns for years. Generous plots on the roads off Luton Road, Southdown and Kinsbourne Green support the kind of extension and renovation work that changes a house permanently rather than cosmetically.

Ceiling prices here justify proper specification, which is why so many Harpenden projects end up as whole-house reinventions: extension, remodel, new services and landscaping in one programme.

Local detail

Planning authority
St Albans City and District Council
County
Hertfordshire
Also covering
St Albans, Wheathampstead, Redbourn, Luton, Kinsbourne Green
Check your planning route

Planning

Planning policy in Harpenden

The constraints we test before design begins, not after a refusal.

  • Applications are determined by St Albans City and District Council, and Harpenden has its own conservation areas including the town centre and East Common.
  • Green Belt surrounds the town, so most new homes come through replacement dwellings rather than new plots.
  • Large rear extensions are common and generally supported, with depth usually set by the 45 degree test from neighbouring windows.
  • Verges, street trees and generous front gardens mean frontage changes and new crossovers are assessed carefully.
  • Neighbour consultation is active here, so we plan early engagement into the programme.

What we build here

The projects that suit Harpenden

Guide costs, planning routes and worked examples for each.

Wrap-Around Extensions

£2,300 to £3,100 typical cost per m²

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Double Storey Extensions

£2,400 to £3,000 typical cost per m²

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New Build Homes

£2,600 to £4,000 typical build cost per m²

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Guidance

Useful reading before you start

Costs

How Much Does a House Extension Cost in 2026?

Read the guide

Costs

Cost of Renovating a House in Hertfordshire: What to Budget in 2026

Read the guide

Extensions

Double Storey Extensions: Costs, Planning and What to Expect

Read the guide

FAQs

Harpenden questions, answered

Typically £2,200 to £3,200 per square metre, with wrap-arounds and two storey work towards the middle of that range and basements above it. Remodelling the existing house is usually part of the budget too.

Next step

Planning a project in Harpenden?

Answer four questions and see an indicative range for your project. It takes under a minute and it is always step one.