Building work in Hendon: area guide

This is our area guide to building work in Hendon (NW4, Barnet): the housing, the council rules that apply (Barnet Council for planning) and every service we offer here. For whole-house refurbishment go to Home renovation in Hendon.

Two quite different kinds of home sit minutes apart in Hendon, and most are the first kind. Purpose-built blocks of flats line the wider roads near Hendon Central and towards Brent Cross, while the streets running back towards Sunny Hill Park and the RAF Museum are filled with interwar houses on regular plots. Work in a flat is governed by a lease and a freeholder. In a house it is governed by an engineer and a party wall. GS Renovation works across both in NW4 and the first conversation is which set of rules your address falls under.

Hendon has around 16,060 homes on the Council Tax list: 43% post-war, 37% interwar and 20% predate 1919, with 62% flats and 38% houses. VOA Council Tax stock of properties, March 2025, for Hendon Central, Hendon Park, North Hendon & Sunny Hill and West Hendon. Counts rounded by the VOA.

A flat in a purpose-built Hendon block starts with the freeholder

Leasehold changes the order of operations. Before a design is finalised, the freeholder's licence to alter has to be obtained for anything affecting structure, layout, floor construction, drainage or the services shared with other flats, and that process takes time you should build into the programme. Permitted development rights do not apply to flats at all, so nothing about external alterations should be assumed either. We assemble the drawings and information the managing agent asks for, provide our insurance details, and wait for consent in writing before structural work begins.

The construction itself sets the rest of the limits. The soil stack position decides where a kitchen renovation or bathroom renovation can realistically put things, and a bathroom over another household means full tanking of walls and floor before tiling. Sound transmission to the flat below is worth addressing while the floor is up, using resilient layers rather than hoping a thicker carpet compensates. Materials and waste move through the communal stair or a single lift, so they are protected at the outset and the route is agreed with the managing agent before the first delivery.

Interwar houses on the streets behind: stacks, spine walls and party walls

The houses towards Sunny Hill Park share a familiar arrangement: a hipped roof, small separate rooms downstairs, chimney stacks sitting on the flank and party walls, and a rear kitchen too narrow for how families live now. Reclaiming a bedroom wall is one of the more common requests, and it is a chimney breast removal job, structural every time. What remains above still needs carrying, so an engineer designs the support, usually a steel beam, or gallows brackets only where the engineer and building control accept them, and we fit whatever the drawing shows, with the redundant flue capped and ventilated to keep condensation out.

On a semi-detached pair, work against the shared wall brings duties under the Party Wall Act, and notice goes to the neighbour before anything is cut. Opening up the ground floor is a load-bearing wall removal job on the same terms: the spine wall carries load, the beam and its bearings are designed rather than estimated, and Barnet Council building control inspects the steel and its supports while still visible. We book those visits when the work is exposed, because covering bearings and reopening them later wastes everybody's week. The same holds for drainage alterations and insulation, both of which have to be seen before they disappear.

Where to go next for work in Hendon: kitchen renovation in Hendon, house extensions in Hendon, the Barnet area guide, building work in Golders Green, building work in Finchley and Renovation Budget & Contingency.