A brick built family home in St Albans, Hertfordshire

Hertfordshire, Welwyn Garden City

Bespoke home builders inWelwyn Garden City

Garden City design codes, generous plots and careful extension design.

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

Building in Welwyn Garden City

What working in Welwyn Garden City actually involves

Welwyn Garden City is unlike anywhere else we work. The original Garden City layout, with its consistent materials, set-backs and street planting, is protected in detail, and extensions have to be designed with that in mind.

Outside the original estate, the surrounding roads and nearby Welwyn village offer larger plots where more substantial extensions and replacement dwellings are achievable.

Local detail

Planning authority
Welwyn Hatfield Borough Council
County
Hertfordshire
Also covering
Welwyn, Hatfield, Digswell, Hertford, Ayot St Lawrence
Check your planning route

Planning

Planning policy in Welwyn Garden City

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

  • Welwyn Hatfield Borough Council determines applications and applies specific Garden City design guidance to the original estate.
  • Conservation area coverage across much of the original town controls materials, window design, roof form and front boundary treatment.
  • Article 4 directions remove some permitted development rights in the estate area, so even modest changes can need consent.
  • Green Belt surrounds the town, which shapes where new homes are achievable.
  • Rear extensions are usually the practical route to more space, with depth set by neighbour amenity tests.

What we build here

The projects that suit Welwyn Garden City

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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Guidance

Useful reading before you start

Planning

Do You Need Planning Permission for an Extension?

Read the guide

Costs

How Much Does a House Extension Cost in 2026?

Read the guide

Planning

Party Wall Agreements for Extensions: The Complete UK Guide

Read the guide

FAQs

Welwyn Garden City questions, answered

Yes, but the design has to respect the original character, and permitted development rights may have been removed by an Article 4 direction. We check your exact position before design work begins.

Next step

Planning a project in Welwyn Garden City?

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