Yes, you can extend in Burwash, but the paperwork gets a vote. Dozens of buildings are listed. The whole village sits inside protected countryside. The neighbours apply for planning permission all the time. Extending here is normal, as long as you ask first.
Historic England lists 72 buildings in Burwash. None is Grade I, 5 are Grade II* and the other 67 are Grade II. Listing covers the whole building, inside and out, not just the pretty front, so almost any change that affects its character needs listed building consent on top of any planning permission. That includes things owners assume are their own business, like replacing windows, taking out an internal wall or changing the roof. Doing the work first and asking afterwards isn't a shortcut. With a listed building, unauthorised works can be a criminal offence, and the conveyancer on your eventual sale will ask. Rother District Council has also designated the High Street a conservation area, specifically to control building there.
The good news is that people here do get on with it. Between March 2024 and June 2026, 159 planning applications were lodged in the area, 69 of them in the last twelve months. For a village this size, that's a steady flow of kitchen extensions, garden rooms and loft plans heading to the council. Nobody in Burwash is short of ambition. What they're short of is the right to skip the queue.
In practice, it depends which house you buy. Most homes here aren't listed, and for those the ordinary permitted development rights apply, letting some extensions go ahead without a full application. Burwash sits entirely within the High Weald Area of Outstanding Natural Beauty, though, and that designation trims some of those rights, so an extension that would be permitted development in a suburb may need an application here. A listed home needs consent for almost anything. A home on the High Street has conservation-area rules layered on top. Before you buy with a two-storey extension already planned, check the listing, check the conservation area boundary and ask the council what it would expect. The cheapest planning advice is the kind you get before exchange.
Your freedom to extend in Burwash is middling. Unlisted homes leave room to grow if you file the forms, while the listed stock and the protected countryside mean the council has a say in the shape of most ambitious plans.