Yes, and with less trouble than the county's reputation implies. The protected buildings here are mostly churches and old manor houses rather than whole streets of them. There is one conservation area in the wider area, and it sits over towards the neighbouring seaside town. Applications go in steadily, month after month, from people doing exactly what you are thinking of doing. Heritage is not what stands between a Highbridge house and a bigger kitchen.
Across the wider area there are 112 listed buildings: 5 at Grade I, 1 at Grade II*, and 106 at Grade II. Spread across a town and a ring of Levels villages, that is a thin scattering rather than a blanket, and it is weighted heavily towards churches, churchyard crosses and the occasional manor. If your house is one of them, listed building consent applies to anything affecting its character, inside as much as out, and it covers the whole structure rather than just the pretty front. Replacement windows, internal walls and roof coverings all fall inside that. If your house is not one of them, and the arithmetic says it almost certainly is not, listing has no bearing on your plans whatsoever.
There is one conservation area in the wider area, at Burnham-on-Sea. Falling inside a conservation area brings additional control, typically over demolition, over work to trees, and sometimes over alterations that would be automatic elsewhere. It applies by boundary rather than by street name, and boundaries in these designations have a habit of running down the middle of a road and treating two identical houses differently. Check the specific address rather than the general area, because nobody involved in the sale will volunteer it.
Three scheduled monuments sit within the area, including the hillfort on Brent Knoll and a scattering of moated sites and prehistoric trackway remains out on the moors. Scheduling is the strictest protection there is, and it bites on the land itself rather than on buildings nearby. For anyone not buying a field with archaeology under it, this is context rather than constraint.
The evidence that people do alter houses here is straightforward. Across the window from April 2024 to June 2026, 248 planning applications were lodged in the area, 100 of them in the last twelve months. That is a steady stream of extensions, conversions and outbuildings from a place where the housing stock is mostly post-war and the plots are mostly generous. It is not a town where an application is an event.
One listed building in the area sits on Historic England's Heritage at Risk register. That means a protected building in poor condition, which usually attracts both scrutiny and the possibility of grant support for repair. It is a project for somebody with patience and a specialist builder, not a warning to anyone buying an ordinary house down the road from it.
Practically, the question for most buyers here is not heritage but the everyday one: whether the work falls within permitted development or needs a full application, and that turns on size, height, position and what it does to next door. The county's planners are the ones to ask, and they will answer the same question the same way whether the house is Georgian or from 1974. What you will not be doing is arguing about the colour of your window frames with a preservation group.
Freedom to alter a home here lands in the middle, which in planning terms is a decent place to be. The protections are real but concentrated on a small number of buildings, so unless you have deliberately bought history, the constraint on your extension will be the ground it stands on rather than the centuries behind it.