You can apply, and plenty of people do, but extending a home in Covent Garden means getting through more heritage protection than almost anywhere in the country. Thousands of listed buildings. Dozens of conservation areas. Almost no houses to extend in the first place. Most homes here are flats in old buildings, so an extension is usually a conversation with the council and the freeholder before it gets anywhere near a builder.
Covent Garden has 2,390 listed buildings: 173 at Grade I, 307 at Grade II* and 1,910 at Grade II. Listing protects the whole building, inside and out, so replacing windows, moving internal walls or changing a staircase can all need listed building consent on top of any planning permission. Carrying out work on a listed building without consent is a criminal offence, so the paperwork does matter.
There are 58 conservation areas in the wider map area drawn around the district. In a conservation area, changes to a building's exterior, its roofline and the trees around it are watched more closely, and demolishing even part of an unlisted building can need consent. Where the listed buildings end, the conservation areas take over.
Four scheduled monuments also lie within that wider area. Scheduling is the strictest level of protection, and it matters mostly for digging or building on land next to one.
Neighbours do get work done. Westminster City Council received 1,879 planning applications for the area between April 2024 and June 2026, 820 of them in the last twelve months. That is a lot of paperwork for a district this size. Whatever change you have in mind, a Westminster planning officer has almost certainly read a version of it this year.
The ground is a factor too. The British Geological Survey puts the whole area in class 3 for shrink-swell, meaning clay that expands when wet and shrinks when dry enough to move shallow foundations. For any extension or basement, that means deeper foundations and a structural engineer's assessment at the start. It isn't a reason to panic, but it does need to be in the budget from day one.
Seventeen listed buildings in the area are on Historic England's Heritage at Risk register. These are buildings in poor condition. Their repair may qualify for grant support and will certainly be closely watched. If you buy into one, expect the repair to come with scrutiny, and possibly some money.
In practice, most of the small changes a house owner elsewhere could make without asking need some form of consent here, and with about 94% of homes being flats, few owners have a house to extend at all. A flat owner usually needs the freeholder's permission as well as the council's. So the first step is to get the lease and the building's listing entry, then book a pre-application meeting with Westminster's planning team. A good architect matters less than knowing what the building's listing actually protects.
Freedom to alter a home in Covent Garden is about as limited as it gets: if your plans include a bigger kitchen, buy one that is already big.