Yes, and with less heritage friction than the town's stone frontages suggest. Only a small number of buildings here are listed. A single conservation area covers the centre. Hundreds of applications have gone in over the past couple of years, which is not the behaviour of a town where people have given up asking. The thing most likely to complicate your extension is not a conservation officer. It is what previous generations dug out from under the garden.
The area holds 32 listed buildings. None are grade one, one is grade two star, and the remaining 31 are grade two. Listing is not a rule about the front elevation. It covers the whole building, interiors included, and any alteration affecting its character needs consent in its own right on top of ordinary planning permission. If you buy one, the sash windows are part of the deal rather than a starting position for negotiation. The compensation is arithmetic: with 32 listed buildings across an area this size, the odds are heavily that yours is not one of them.
There is one conservation area, covering Radstock itself. Inside a conservation area the council takes a view on how alterations read from the street, demolition and tree work come under tighter control, and some permitted development rights can be restricted. Outside it, which is most of the town, you are working under the ordinary national rules like everyone else. The boundary matters far more than the postcode, and it is worth checking which side of it a house sits on before the architect starts drawing.
One scheduled monument sits within the area. That is the strictest protection tier in the system, and it bites on ground disturbance near the monument rather than on what a homeowner does to a semi half a mile away. For nearly every buyer here it is a line on a map rather than a constraint.
The planning register shows what the neighbours are actually up to. Between April 2024 and June 2026 the area saw 778 applications, of which 339 were lodged in the last twelve months. That is a town where people extend, convert lofts, replace windows and build over the side return in reasonable numbers. Whether any given application succeeded is a question for the individual case file, but nobody here is waiting for permission to become fashionable.
The ground is the genuine local complication, and it is universal rather than patchy. Every postcode in Radstock sits inside a coal-mining consultation area, and all 324 of them sit over at least one recorded mine working. On average there are about 56 recorded workings within 500 metres of a postcode, the densest has 33 directly beneath it, and the busiest 500-metre radius contains 106. This is the legacy of a coalfield that ran until 1973, and it is entirely normal here. In practice it means a mining search on purchase, sometimes a specialist report before building work, and occasionally a lender or insurer asking a question they would not ask in a town with nothing underneath it. It is a process, not a verdict on the house.
Most extensions here will follow the same route as anywhere else in England: check whether the work falls under permitted development, and if it does not, apply. What Radstock adds is a second question about the ground rather than a second question about the aesthetics. Budget for the search and the possible report, get them done early, and the planning side is unlikely to be the part that keeps you awake.
Freedom to alter a house here is middling, which for a town this old is a decent outcome. The heritage constraints are narrow enough to sidestep by choosing the right street, and the mining legacy is broad enough that it cannot be sidestepped at all, only surveyed.