You can extend a house in Putney, but you will rarely do it without asking first, and some houses can hardly be altered at all. Close to three hundred buildings are listed. Dozens of conservation areas cover the district and its surroundings. The neighbours file planning applications at a rate of several a day. Freedom to change a house here is something the council grants. Ownership does not come with it.
Historic England lists 284 buildings in Putney: 5 at Grade I, 27 at Grade II* and 252 at Grade II. Listing covers the inside as well as the outside, so on any of them a new window, an internal wall or a change of roof covering needs listed building consent on top of any planning permission, and carrying out work without it is a criminal offence. Buying a listed house and extending it later is entirely possible. It takes longer and costs more, and the conservation officer takes part in every decision.
The patch drawn around Putney contains 47 conservation areas, among them Putney Embankment, Putney Heath, Putney Lower Common, East Putney and West Putney. Inside a conservation area, demolition, some extensions and changes to the front of a house can need permission that would not be required elsewhere, and the council looks harder at materials and appearance. Ask Wandsworth's planning team whether the specific house sits in a conservation area and whether any extra restrictions apply on that street, because the boundaries follow the streets themselves and pay no attention to how far a house is from the river. "Scope to extend, subject to consents" is the phrase that tends to appear in sales particulars here, and the part after the comma is where the work is.
Two scheduled monuments fall in the wider area. That is the strictest tier of protection in England, and it matters mainly to anyone whose land adjoins one.
None of this has stopped Putney altering its homes. Wandsworth's planning register logged 2,076 applications for the area between April 2024 and June 2026, 937 of them in the most recent twelve months. That is evidence of a district that keeps asking, and a buyer planning a rear extension will be joining a very long queue of neighbours with the same idea.
The ground is the other planning conversation. The British Geological Survey puts the whole of Putney in shrink-swell class 3, which describes clay that swells when wet and shrinks when dry. That is a published hazard class, and for an extension it means deeper foundations and a structural engineer's view on trees and drainage near the new walls. It is a design point for the builders and nothing more alarming.
Seven listed buildings in the area are on Historic England's Heritage at Risk register. Those buildings are in poor condition, and their repair may attract grant money and will certainly attract scrutiny. For the owner of an ordinary house down the road, they are mainly a sign of how closely the area's old buildings are watched.
Most Putney homes are flats, and flats do not carry the permitted development rights that let a house owner add certain extensions without applying. A house outside a conservation area and off the listed register still has those rights. A flat, a listed building or a house in a conservation area should assume that an application is needed until Wandsworth confirms in writing that it is not.
Freedom to change a home is Putney's weakest point, and planning consent here is part of the cost of ownership. Anyone who wants to buy a house and redesign it at will should look somewhere with fewer listed buildings and conservation areas.