# Builders in Hampstead Garden Suburb

Canonical URL: https://mirion.uk/areas/barnet/hampstead-garden-suburb/

> Renovations, extensions and loft conversions in Hampstead Garden Suburb, NW11 and N2: how Trust consent, Barnet planning and Article 4 rules work together.

Work in Hampstead Garden Suburb needs two separate consents and careful design, so we plan renovations, extensions and loft conversions here around the Suburb Trust's design guidance from the start.

Hampstead Garden Suburb was founded by Henrietta Barnett. In 1906 she set up the Hampstead Garden Suburb Trust, which bought 243 acres of land from Eton College and appointed Raymond Unwin as architect, with Edwin Lutyens also involved. The Trust describes its houses and flats as representing the best of English domestic architecture of the early twentieth century, with undivided houses, individual gardens and hedges rather than walls. The Suburb expanded north of the A1 in the 1930s.

At the 2021 Census, 63% of households in the Hampstead Garden Suburb statistical area lived in houses: 32% semi-detached and 26% detached. The median semi-detached sale there was about £1.67 million in the year to March 2026.

Projects here are usually high-specification renovations, rear extensions designed to suit the original architect's work, and loft conversions, all of which must follow the Suburb's design guidance.

Two separate consents usually apply. The Suburb is a conservation area with an Article 4 direction, so permitted development rights don't apply and external alterations generally need planning permission from Barnet. In addition, freehold houses are subject to a Scheme of Management under the Leasehold Reform Act 1967, approved by the High Court in 1974, and the Trust's consent is needed for any external change, including loft conversions.

Trust consent is applied for separately from planning permission, and listed buildings also need listed building consent from Barnet. Some repairs need the Trust's prior consent even without a formal application, so we contact the Trust's architectural team early and follow its [published guidance](https://www.hgstrust.org/your-property/faqs.shtml).

Building work in Hampstead Garden Suburb: common questions

Do I need Trust consent for a loft conversion in Hampstead Garden Suburb?

Yes. The Trust says internal works to freehold houses don't need its consent, with the exception of loft and garage conversions, because they almost always change the outside. Planning permission from Barnet is a separate requirement.

Does permitted development apply in Hampstead Garden Suburb?

No. The Trust notes that the Suburb is a conservation area with an Article 4 direction, so permitted development rights don't apply and external alterations may need planning permission.

- Local planning authority: London Borough of Barnet
- Postcode districts: NW11, N2
- Work Mirion has carried out here: Extensions, loft conversions and renovations