You can extend a house in West Norwood, but planning rules apply across much of it. There are more than a hundred listed buildings in and around it. Large parts fall within conservation areas. The clay underneath makes foundations a job for an engineer. Most homes are flats, and flats have far fewer automatic extension rights than houses. Plenty of neighbours have still got their extensions through.
There are 115 listed buildings in and around West Norwood. One is Grade I, 11 are Grade II* and 103 are Grade II. Listing covers the inside of a building as well as the outside, so almost any change to a listed building, from a window to an internal wall, needs listed building consent on top of any planning permission. Lambeth can refuse it even when planning permission alone would have gone through.
There are 12 conservation areas in and around West Norwood, among them Lancaster Avenue, Park Hall Road, Elderwood, Rosendale Road and Norwood Grove. In a conservation area, the council looks harder at changes to the outside of a house, especially anything visible from the street, and some work that would normally go ahead without an application needs one. On Park Hall Road, your front elevation is partly the street's business as well as yours.
Neighbours are still extending. Lambeth received 504 planning applications in West Norwood between April 2024 and June 2026, 200 of them in the last twelve months. Search the council's planning register for your street, because the applications are public and somebody nearby has probably already found out what Lambeth will accept on houses like yours.
The British Geological Survey puts shrink-swell clay at class 3 across every postcode in West Norwood. Shrink-swell clay expands when it's wet and shrinks when it dries, which can move shallow foundations. An extension here will usually need deeper foundations than on firmer ground, and a structural engineer's view, particularly near large trees. The clay is the same in every conservation area.
Three listed buildings in the area are on Historic England's Heritage at Risk register. That means those buildings are in poor condition and their owners get extra scrutiny and possibly grant money. It doesn't put any extra restriction on an ordinary house nearby.
About 62% of West Norwood's homes are flats, and flats don't get the permitted development rights that houses get. A loft room, a new window or a rear extension on a flat usually needs a planning application. A house outside a conservation area and off the listed register has the most freedom. A house inside one of the 12 conservation areas has less, and a listed house needs consent for almost everything.
On the whole, West Norwood is restrictive about alterations. A house outside a conservation area can usually be extended, but most other homes here need an application, or two, for the work you have in mind.