For most houses here, yes, and with less argument than you would get in a prettier village. The listed stock is small and concentrated. No conservation area covers the village. Plenty of neighbours are already at it. The heritage constraint in Uffculme is a specific problem for a specific set of houses rather than a blanket condition on the postcode.
Twenty-seven buildings in the area are listed. One holds grade one, four are grade two star, and the remaining 22 are grade two. If yours is one of them, the rules change completely: listed building consent covers alterations inside as well as out, it applies to things most people would not think of as building work, including windows, internal walls and sometimes fittings, and doing it without consent is a criminal matter rather than a paperwork one. That is why the grade split matters. The five at grade one and grade two star are the properties where even a modest scheme becomes a specialist project with a specialist budget.
For everything else, the constraint is ordinary planning rather than heritage. Mid Devon District Council recorded 575 planning applications across the area between April 2024 and June 2026, with 272 of those in the last twelve months. That is a village where somebody is always applying for something, which tells you two useful things: the process is well trodden here, and the neighbours will already know what the local approach to a rear extension looks like.
In practice, an unlisted house with no conservation area over it sits under the national permitted development rules, which cover a fair amount of what people actually want: a modest rear extension, a loft conversion within the existing roof shape, outbuildings in the garden. Beyond those limits, or where the house has had permitted development rights removed by a previous condition, you are into a full application. The two things worth checking before you fall in love with a floor plan are whether the property is listed and whether any earlier consent attached conditions to it, both of which the council's own records answer faster than an architect will.
Freedom to alter a house is one of Uffculme's quieter advantages. Unless you buy one of the 27, the only real obstacle is the standard one everybody faces.