In Belsize Park (NW3) the split is 93% flats to 7% houses over 3,000 households, and the stock is mainly Victorian.
The renter-heavy mix here (39% owned, 51% privately rented) means a NW3 diary swings between short-notice tenancy deadlines and appointments set a fortnight out.
Walls are lath and plaster over timber studs; locally that also means with solid brick on the party and external walls, and with 45% one-person households in Belsize Park, one adult is usually the only pair of hands on site, so the fixing that matters in Belsize Park is chosen on site — the usual failure here is a plasterboard plug spun into lime plaster in NW3, which crumbles the key and drops the panel, the reality on the streets around Belsize Village.
Stucco villas and mansion blocks on the slope between Hampstead and Chalk Farm. That character decides the practical detail of shed assembly here far more than the borough boundary does. Belsize Park sits inside the Congestion Charge zone as well as ULEZ, so both are itemised on the quote rather than absorbed into an hourly rate.
On access, resident-permit streets, hill gradients and conversion flats up three or four flights — one reason one fitter for a small shed on a ready base; two for anything over 8x6ft or where roof panels need lifting together. Fitters travelling in use Belsize Park (Northern).