Yes, and the planning department is unlikely to be the thing that stops you. Listed buildings here number a few dozen in total. One conservation area covers part of the town. Well over a thousand planning applications have gone in across the wider area in a little over two years. The obstacle in Midsomer Norton is not the heritage officer. It is what is underneath the house.
There are 41 listed buildings across the area, and none of them are grade one. Seven are grade two star, the middle tier, and the remaining 34 are grade two. Listing applies to the whole building inside and out, so if you own one, everything from a rear extension to replacing the windows needs listed building consent alongside any planning permission, and the answer is frequently a conversation rather than a form. For the overwhelming majority of houses here, that entire paragraph is irrelevant, because 41 buildings across a town of this size is a rounding error in the housing stock.
There is a single conservation area, covering Midsomer Norton and Welton. Inside that boundary the usual pattern applies: permitted development rights are typically narrowed, external alterations get looked at more carefully, and trees get protection they would not otherwise have. Whether any particular restriction bites on your address is a question for the council rather than an assumption, so check the boundary before you commission drawings, not after.
The live evidence says people alter their homes here constantly. Across the window from April 2024 to June 2026, 1,209 planning applications were submitted in the area, 544 of them in the last twelve months, with 41 withdrawn. That is not a town where extensions are exotic. That is a town where somebody on your street is currently arguing with a builder about a rear return.
The actual constraint is geological, and it applies to everyone. Every postcode in this area falls within a coal mining consultation zone, which is what you get for building a town on the Somerset coalfield and then digging it out from underneath yourselves. More pointedly, 319 postcodes sit directly over a recorded mine working. In practice that means a coal mining search on purchase, potentially a specialist report if the search flags anything, and a lender or insurer who wants to see the paperwork before committing. It does not mean the house is falling down, and it does not predict anything about any particular plot. It means the question gets asked, and the answer needs to exist in writing. Anyone planning foundations for a substantial extension should expect their engineer to want that information early rather than late.
For most houses here, the practical position is straightforward. The dominant stock is post-war semi-detached and detached housing on plots with room either side, which is precisely the shape that permitted development was written for: single-storey rear extensions, side returns, loft conversions and outbuildings that never trouble a planning committee. Permitted development has size and position limits that vary with the property, and a house that has already been extended once has less headroom than one that has not. The heritage constraints that would complicate all this apply to a small minority of addresses. The mining searches apply to everyone.
Freedom to alter a home here sits in the middle: not the free hand you get on a modern estate with no history, not the paperwork ordeal of a properly protected town. The council will mostly leave you alone. The coalfield will not.