Yes, for almost every house in the village. Only a handful of buildings are listed. No conservation area covers Warlingham. The neighbours put in planning applications all the time. The main thing standing in your way is next door, and they're busy with their own extension.
Historic England lists 17 buildings in Warlingham. None is Grade I, 2 are Grade II* and 15 are Grade II. Listing means any change to the fabric of the building, inside or out, needs listed building consent from the council as well as any ordinary planning permission, and the bar for that is high. With 17 listed buildings in a village of thousands of homes, nearly every buyer will be dealing with an unlisted house. The manor here passed through priories, courtiers and brewers from 1144 onwards, and left very little red tape behind.
The neighbours prove the point. Tandridge's planning register shows 1,274 applications in the Warlingham area between April 2024 and June 2026, 570 of them in the last twelve months. That is evidence that people here alter their homes as a matter of routine. It says nothing about how many were approved, and nobody should read an approval rate into it. Up here, scaffolding is about the only crop the Green Belt doesn't object to.
In practice, most unlisted houses outside a conservation area can take a modest rear extension, a loft conversion or an outbuilding under permitted development, without a full application, within national size limits. Anything bigger, closer to a boundary, or on a house that has already used its allowance goes to Tandridge District Council as a normal application. Warlingham is in the Green Belt, so homes on the village edge can expect more scrutiny of anything that adds bulk. A previous owner's extension or a planning condition from when the house was built can also remove some of those rights. Search the council's planning history for the exact address while you can still renegotiate, so you know what the last owner used up.
For extending or altering a home, Warlingham is about as easy as Surrey gets, with listed-building rules touching only a handful of properties. For most buyers the extension is a question of budget and the neighbours' patience, and the planners are rarely the problem.