Yes, for most houses, because Aldershot's heritage rulebook is thin. There is no Grade I building anywhere in town. No conservation area sits inside it. The neighbours put in planning applications constantly. The obstacle to your extension is usually the house next door, not the history books.
Aldershot has 68 listed buildings. None is Grade I, 3 are Grade II* and 65 are Grade II. Listing covers the whole building, inside and out, so any change that affects its character needs listed building consent on top of any planning permission, and doing the work without it is a criminal offence, not a paperwork slip. For a town this size, 68 is a short list, and the odds that the semi you are viewing is on it are low. Check anyway, because "probably not listed" is not a phrase a conveyancer accepts.
The strongest evidence that people alter homes here is the planning register. Between April 2024 and June 2026, 1,724 planning applications were lodged across the area, 715 of them in the last twelve months. That is a town busy with loft conversions, rear extensions and the other projects people start when moving costs more than building. Volume says nothing about how many were approved, so treat it as proof that people try, not proof that everyone gets what they asked for.
One listed building in the area sits on Historic England's Heritage at Risk register. That means a building in poor condition whose repair may attract grant support and will certainly attract scrutiny. It is a matter for whoever owns that building. For anyone buying an ordinary house nearby, it changes nothing.
In practice, most Aldershot houses sit outside both listing and conservation controls, so many smaller extensions and loft conversions can go ahead under permitted development rights without a full planning application. The limits depend on the type of house and the work, and permitted development rights can be removed on individual properties or estates by planning condition, which is the detail a seller rarely volunteers. Before paying for plans, ask whichever council covers the address for a lawful development certificate: Rushmoor on the Hampshire side, Guildford for Ash, Ash Vale and Ash Green. Anything bigger goes through ordinary planning, where the arguments are about your neighbour's light and privacy.
Your freedom to extend in Aldershot is middling: heritage rarely gets in the way, but ordinary planning still does, and the neighbours have a say.