You can extend in Faringdon, as long as the house is not old and the ground is dug deep enough. Over a hundred buildings are listed. The town centre sits inside a conservation area. Every part of the area sits on ground that shrinks and swells. The planners are only half the conversation. The soil wants a say too.
Faringdon has 125 listed buildings. Two are Grade I, two are Grade II* and the other 121 are Grade II. Listing covers the whole building, inside and out, so changes that would be routine elsewhere, such as new windows, a knocked-through wall or a rear extension, need listed building consent on top of any planning permission. Grade II is the most common grade and the least restrictive, but still means a conversation with the council's conservation officer before anyone picks up a hammer. Doing the work first and asking later is a criminal offence for listed buildings, not a paperwork issue.
There is one conservation area, the Faringdon conservation area, covering the historic centre. Inside it, the rules tighten for everyone, listed or not: demolition, some extensions and changes visible from the street can need permission that would not be required outside the boundary. Whether any extra direction removes further householder rights is something the council's planning pages will confirm for a specific address. Outside the boundary, most of the town's post-war and later housing sits under ordinary planning rules.
The local planning record is too thin to read much into. The records held here show a single application in the area, lodged in September 2025, and that is the only one in the twelve months covered. One application is a sample size, not a trend. It says nothing about what the council approves and should not be treated as evidence either way. The Vale of White Horse's own planning register is the place to look for what neighbours have built.
The ground is the part buyers overlook. The British Geological Survey puts the area's shrink-swell hazard at class 3, and 100% of the area reaches that class. Shrink-swell ground expands when wet and contracts when dry, which moves foundations that are too shallow. For an extension, that means deeper foundations than a builder might quote on sight, and a structural engineer's view before the plans are drawn. Trees near the proposed footprint matter too, because roots draw moisture from the ground and make the movement worse. None of this stops an extension. It changes the budget.
In practice, a post-war semi on the edge of town can often use permitted development rights for a modest rear extension or loft conversion, subject to the national size limits and a prior-approval check where required. A listed house, or anything inside the conservation area, needs formal consent before work starts. Either way, check the exact address against the council's records before buying with an extension already spent in your head.
Your freedom to extend in Faringdon is middling: straightforward on most of the newer housing, tightly controlled in the old centre, and more expensive underground than on paper everywhere.