Usually yes, but the older the house, the more people get a say. There are nearly six hundred listed buildings across the wider area. There's a conservation area. The neighbours submit planning applications all the time. A new-build semi gets a conservatory, and a listed farmhouse gets a meeting with the council.
The wider Headcorn area has 590 listed buildings. Nine are Grade I, 30 are Grade II* and 551 are Grade II. Grade II is the everyday tier, but it still means listed building consent for works that affect the building's character, and that covers the inside as well as the outside. Windows, doors, roof coverings, internal walls, chimney breasts and old joinery are all protected. Grade II* and Grade I buildings are protected more strictly still, with the council's case officers and heritage bodies looking closely at anything that touches the historic fabric. Buyers who assume listing only covers the front of the house tend to find out otherwise when they want to move a wall.
There's one conservation area in the area. Inside a conservation area, permitted development rights are narrower. Demolition, some cladding, some roof changes and alterations facing the street can all need permission that the same work elsewhere wouldn't. Councils can also remove further rights in specific streets. Whether a particular house is inside the boundary is the first thing to check, and it takes five minutes on the council's map.
There are five scheduled monuments in and around the area. Scheduling is the strictest protection there is, and it mainly matters to anyone buying land next to one, where groundworks near the monument need their own consent.
None of this stops people building. Across the area, 3,751 planning applications were submitted between April 2024 and June 2026, with 1,613 of them in the last twelve months. That's a steady flow of extensions, loft conversions, outbuildings and alterations going through the system. People here do extend. They just go through the council to do it, and they wait for an answer.
In practice, an unlisted house outside the conservation area can often use permitted development rights for a modest rear extension or a loft conversion, subject to the usual size limits and a check with the council. A listed house needs listed building consent on top of any planning permission, and doing works without it is a criminal offence, not an administrative slip. Before you buy, look up the property's listing entry, check whether it's inside the conservation area, and search the council's planning register for what the house and its neighbours have already applied for. "Potential to extend, subject to planning permission" are the four most expensive words in a property listing, and the council's register tells you what they're worth for a particular house.
You have limited freedom to extend or alter a home in Headcorn. A modern house gives you room to do what you like, a listed one means asking permission at every step, and it's worth knowing which kind you're buying before you pay for it.