In most of Sharpness you can extend without much heritage paperwork. Only three buildings are listed, all at the lowest grade. There is one conservation area, and it covers the old dock. Neighbours apply for planning permission all the time. For most houses here, the usual planning rules are the only ones that apply.
Historic England lists three buildings in Sharpness, all at Grade II. None are Grade I or Grade II*. Listing means almost any change that affects a building's character, inside or out, needs listed building consent on top of any planning permission, and that includes windows, doors and internal walls. Owners of those three buildings face that process. The rest of the village's houses do not.
Sharpness has one conservation area, Sharpness Old Dock. Inside a conservation area the council takes a closer interest in changes to the outside of a building, and some work that would normally go ahead without an application can need one. Stroud District Council publishes the boundary, so check whether a particular house falls inside it. For most of the village it does not. The protected part of Sharpness is the working waterfront, and the houses that grew up around it have far fewer rules.
People here do alter their homes. The area had 225 planning applications between April 2024 and June 2026, and 101 of them came in the last twelve months. That is plenty of extensions, alterations and other proposals for a place this size. The volume says nothing about how many were approved. It only shows that people keep asking.
Mining is a small issue here. About 3% of postcodes have a recorded mine working within 500 metres, none have one directly underneath, and the nearest recorded working is about 285 metres away. Sharpness is outside the coalfield consultation area. A conveyancer may still run a mining search, and a lender may ask about the result. Most buyers will find nothing worth worrying about.
In practice, a terrace or semi outside the Old Dock area is usually governed by the national permitted development rules plus whatever Stroud District Council decides on an application. Small rear extensions and some loft work can often go ahead without a full planning application, and bigger or more visible changes need one. If the house is listed or inside the conservation area, the rules tighten. For most houses in Sharpness, extending is a matter of ordinary planning, not heritage permission.
Your freedom to extend in Sharpness is one of its stronger points. Outside three listed buildings and the old dock, the paperwork is the ordinary kind.