Yes, you can extend most houses in Fairford, but the older the house, the more people have a say in it. The historic centre is heavily protected, with more than a hundred listed buildings and a conservation area across the old town. The post-war estates around it are much more relaxed. Plenty of residents are getting permission for work all the time. Whether your plans go smoothly depends far more on the house you buy than on the town.
Historic England lists 119 buildings in Fairford. One is Grade I, four are Grade II* and 114 are Grade II. Listing covers the whole building, inside and out, so even replacing windows, moving an internal wall or changing a roof covering needs listed building consent as well as any planning permission. Doing the work without consent is a criminal offence, and the owner at the time is liable, including an owner who bought the house after someone else did the work. Find out whether a house is listed early on. A listed cottage costs more to change than it does to buy.
There is one conservation area, Fairford's own. Inside it the council looks harder at anything visible from the street, and some work that would be routine elsewhere, such as demolition, some cladding and work to trees, needs consent. Two houses a street apart can face very different rules, depending on which side of the boundary they fall.
There are also two scheduled monuments in the area, the strictest tier of protection. They mostly matter for land next to one, where even digging foundations can need separate consent.
Fairford is far from frozen, though. The planning records for the area show 2,829 applications between April 2024 and June 2026, and 1,311 in the last twelve months. Those applications cover everything from loft conversions to new houses. Clearly plenty of people here still get around to building something.
The ground needs some thought too. The British Geological Survey's shrink-swell hazard reaches class 3 in parts of Fairford, covering about 7% of the area. Class 3 is a moderate rating: some clay in those spots swells when wet and shrinks in a dry summer. For an extension that usually means deeper foundations and a structural engineer's view before the builder starts, plus some thought about nearby trees. It is a cost to plan for, and no reason to give up on the idea.
In practice, a post-war semi on the edge of town can usually take a rear extension or a loft conversion under permitted development rights, or with a straightforward planning application. A listed house, or one inside the conservation area, goes through consent for nearly everything visible. Check which kind of house you are looking at early, with the council's conservation area map and the national list of listed buildings. Wool merchants paid for Fairford's Grade I church, and their buildings still decide how much freedom the house next door gets.
Fairford is middling for freedom to build. Most homes can be extended with ordinary planning steps, but a historic centre and a stretch of clay mean the nicest old houses carry the most paperwork.