Mostly yes, and the planning environment is not as protective as a coastal-village postcode might suggest. There are sixty-one listed buildings in the area, all Grade II. There is one conservation area, covering the centre of the town. There are no scheduled monuments inside the Selsey boundary. For most properties on most streets, planning permission is reachable without an exceptional case, and permitted development rights still apply in the usual way for the usual extensions. The exceptions matter, and they are the buildings and the streets the Council has put a marker on.
The sixty-one listed buildings all carry the Grade II designation. Grade II is the working end of the listing scale, covering buildings of special interest that the system wants to keep, but with more practical flexibility than the Grade I or Grade II-star categories that protect rarer historic stock. None of those higher categories appears in the local total, which says something about the kind of historic fabric Selsey actually carries: parish churches, a windmill, a scattering of older cottages, not a high concentration of significant historic houses. St Peter's Church and Medmerry Mill are the named Grade II entries that most people will already have walked past. If you own one of the sixty-one and you do not know it yet, your conveyancer will tell you before exchange. Every change to a listed property, from window frames to internal partitions, needs listed building consent in its own right, on top of any planning permission. The wider point is that the majority of houses in Selsey are not listed, and the listing burden does not weigh on the average Selsey street.
One conservation area sits inside the Selsey boundary, and it covers the centre of the town. A conservation area adds a layer of planning consent on top of standard permission for the work that affects the look of a property from the public realm. Replacing windows in original materials, extending the visible footprint, or removing boundary walls become consent matters rather than free-choice ones. The default presumption is that the Council will want to be consulted on anything visible from the street. Outside the conservation area, which is most of Selsey by area, the standard planning regime applies and the design choices stop being a planning conversation.
For the great majority of Selsey houses, which is to say the post-war and mid-century bungalow-and-detached stock outside the conservation area, the planning environment is broadly permissive. Permitted development rights cover the standard rear extension, the loft conversion, the porch, and the outbuilding inside the usual size and height limits. Permission becomes necessary when the work goes beyond those limits, when the property is listed, when it sits inside the conservation area, or when the site is close enough to the coast that flood or environmental considerations come into play. The local planning department's recent published workload runs at around six hundred applications a year across the post town area, which suggests there is no particular bottleneck in the system and no shortage of owners going through it.
Selsey lands at three out of five for the freedom to extend or alter a home. Most owners can do most things, with a permission round if the work is significant. The minority who own listed buildings or sit inside the conservation area need to budget for the consent process and the patience that goes with it.