In Camden, external work starts with reading the direction: 39 of the 40 conservation areas have an Article 4 direction, but the data does not show what exactly it removes. Clarity exists only for the tiny Hanway Street, with 36 houses: there, permitted development rights for windows, roofs, panels or pumps are removed. What you can do without an application is set out in the general rules for conservation areas.
Old walls and listed buildings
Uninsulated solid walls in 67.1% of houses in the borough's areas, against 48.7% across England's conservation areas; 1,798 listed buildings. Bloomsbury has 501 among 7,517 houses, Hampstead 429, with a gas boiler in 86% there. Alexandra Road stands apart: solid walls at 3% of its 407 houses.
Heat pumps
The EPC register for November 2026 counts 426 heat pumps in Camden's areas, 89 of them in Bloomsbury. The page for your area or the council will show the boundary near your street. The rules on the site are national, as at 21 October 2026, and are not a planning decision; for your own house, the question is one for Camden council.