Yes, for most houses, with the usual paperwork and a proper look at the foundations. The heritage controls cover a small corner of the village. The planning office is busy with people doing exactly this. The ground asks for a deeper hole than you might budget for. The old waterside is guarded; the estates are open for business.
Historic England's list records 27 listed buildings in the area: none at Grade I, 2 at Grade II* and 25 at Grade II. If you own one, almost any change that affects its character, inside or out, needs listed building consent on top of any planning permission, and doing the work first and asking later is a criminal offence, not an admin error. For everyone else, 27 listings spread across a village of several thousand homes is a light touch.
There are three conservation areas: Bursledon Windmill, Old Bursledon and Swanwick Shore. Inside them, the council takes a closer interest in anything visible from the street, from extensions and roof changes to replacement windows, and some changes that would sail through elsewhere need a formal application. Buyers who fell for the old part of the village should expect the old part of the village to have opinions about their plans.
The neighbours are not waiting for permission to dream. Between April 2024 and July 2026, the planning register recorded 1,333 applications, 493 of them in the last twelve months. That is a steady queue of kitchen extensions, loft conversions and new garages, and it answers the question more honestly than any brochure: people here alter their homes, and do so often.
The ground deserves more thought than the planners. The British Geological Survey classes the area at 3 for shrink-swell clay, and every postcode reaches that class. Clay that swells when wet and shrinks when dry moves foundations, particularly near trees. For an extension it usually means deeper foundations than a standard design assumes and a structural engineer's view before the builder quotes. It is a cost line, not a reason to abandon the plan, and the extension that skips it is the one that cracks away from the house a few summers later.
In practice, a late-twentieth-century semi or detached house outside the conservation areas is likely to have permitted development rights for modest rear extensions and many loft conversions, subject to the national limits and a check that earlier owners or the original planning consent have not removed them. Inside a conservation area, or on a listed building, assume you need consent and talk to the council before paying an architect for anything ambitious.
Bursledon's freedom to extend is middling: easy for the bulk of the housing, tight in the historic pockets, and everywhere dependent on digging deep enough. Check the map, then check the clay.