Yes, and half your street has probably beaten you to it. Only a handful of buildings are listed. No conservation area covers the village. Hundreds of planning applications go in every year. The only thing standing between most owners and a kitchen extension is the builder's quote.
Historic England lists 8 buildings in Crowthorne. None is Grade I, one is Grade II* and seven are Grade II. Listing means any change that affects a building's character, inside or out, needs listed building consent on top of any planning permission, and that covers windows, walls, roofs and sometimes the paint. For eight addresses in a village of thousands of homes, that's a rule that bites a small number of owners hard and leaves everyone else alone. If your house isn't one of the eight, listing isn't your problem. If it is, the surveyor will tell you before the estate agent does.
The more telling figure is what everyone else is doing. Between April 2024 and June 2026, 1,920 planning applications were lodged in the area, and 854 of them in the most recent twelve months. That's a village in a permanent state of loft conversion. Rear extensions, side returns, garage conversions, dormers: the detached houses that make up so much of Crowthorne were built on plots with room to grow, and their owners have noticed. Anyone who buys here expecting a quiet first year should factor in a skip on the neighbour's drive.
With no conservation area covering the village, most ordinary homes carry the standard national permitted development rights, which allow certain extensions and alterations without a full application, within size and position limits. Anything bigger, closer to a boundary or taller needs planning permission from Bracknell Forest. The sensible first step is checking whether a previous owner or an estate-wide condition has already removed those rights, because some newer estates carry restrictions in their original consent. A lawful development certificate from the council settles the question before the builder turns up, and costs less than finding out the hard way.
Crowthorne gives owners plenty of freedom to extend. The limits here come from the size of your plot and your neighbour's patience, not from heritage rules.