Yes, unless your house happens to be one of the fifty-two the state has taken a formal interest in. Two of those carry the highest grade. One conservation area covers part of the town. Hundreds of planning applications have gone in over the past two years. Extending here is ordinary, right up until the moment your address turns out to be historic, at which point it becomes a project with a paperwork phase.
The heritage register lists 52 listed buildings in and around the town. Two are Grade One, three are Grade Two Star, and the remaining 47 are Grade Two. Listing is not a plaque and a pat on the head. It means listed building consent is needed for alterations that affect the building's special interest, and that protection runs to the inside as well as the outside, so a staircase, a fireplace or a run of original panelling can be as much of an obstacle as the front elevation. Owners who discover this after signing the contract tend to describe the experience in language this page cannot reproduce.
There is one conservation area here. Designation brings a second layer of control on top of whatever applies to the individual building: demolition, work to trees and the appearance of alterations all come under closer scrutiny, and permitted development rights that would be automatic elsewhere can be restricted within the boundary. The practical effect is that things which are a weekend job on the edge of town become an application in the middle of it.
The volume of applications says people get on with it anyway. Planning records carry 356 applications across the area between April 2024 and June 2026, with 158 of those in the last twelve months. That is a steady flow of extensions, conversions, outbuildings and alterations from people who worked out what applied to their property and then went ahead. Whether they were granted is a separate question and not one this figure answers, but nobody is submitting that many applications into a town that says no to everything on principle.
For most buyers the practical position is straightforward. The council-tax valuation list carries 4,010 dwellings here, and with 52 listings across the area, the overwhelming likelihood is that your house is not one of them. Outside a listing and outside the conservation area, the usual permitted development rules apply and a rear extension or a loft conversion is a normal conversation with a normal builder. Inside either, assume you need consent, assume the design will be argued over, and get an architect who has done it here before rather than one who has done it somewhere flat and modern. About a quarter of the dwellings on the valuation list were built before 1930, so period construction is common even where formal protection is not, and old walls have their own opinions about what you can bolt onto them.
Freedom to alter a home here sits in the middle: better than a village where every roof tile is spoken for, worse than a post-war estate where nobody looks twice. Find out which category your specific address falls into before you fall in love with a floorplan, because in Ottery that single fact decides whether your extension is a builder's quote or a campaign.