Extending a house in Weston-super-Mare depends less on your architect and more on which house you buy. This is a town wrapped in heritage protection. There are getting on for three hundred listed buildings across the area. Ten conservation areas sit inside its boundary, along with more than twenty scheduled monuments. Land on the wrong address and the planning department becomes your most involved design partner.
Listing is the hardest constraint, and Weston has plenty of it. Around three hundred buildings carry a listing, fifteen of them the top grade and a couple of dozen the middle one, with the bulk in the standard grade. If your house is one of them, listed building consent is needed for the kind of work that is nobody's business on an ordinary home: new windows, internal walls, a rear extension, sometimes the paint and the front door as well. The protection follows the whole building, inside and out, so the loft conversion you sketched on the back of an envelope turns into a conversation with a conservation officer.
Conservation areas throw a wider net over far more houses. Ten of them fall within the town's boundary, taking in older cores such as Worle Village and Uphill, and they do not need your house to be listed to tie your hands. Inside one, the usual permitted-development freedoms are trimmed back. Demolition, cladding, some extensions and works to trees can all need consent that the identical job would not need two streets away. The purpose of the designation is to hold the character in place, which is a polite way of saying keep it looking roughly as it does now.
For most ordinary Weston homes, the practical answer is friendlier than the map first suggests. A post-war house on an estate outside the protected zones can usually extend under permitted development, within the normal size and height limits, without a full application. The trouble mainly starts when the house is listed, sits inside a conservation area, or backs onto something scheduled. The single most useful thing you can do before you buy is check the exact address against the listing and conservation-area maps rather than assume a whole town runs on one rulebook.
The verdict is a cautious one. Weston is a heavily designated place, and the freedom to knock through, build out or swap the windows is tighter here than in most towns of its size, so confirm what protects your particular house before you plan a single wall.