Yes, and people do it constantly, but the older and prettier your house, the more of the project happens in a planning officer's inbox. There are 183 listed buildings in the area and a conservation area sitting over the town. Hundreds of applications have gone in over the past couple of years. The difference between an easy extension and a two-year negotiation is mostly a matter of which street you bought on. Nobody here gets to skip the paperwork on charm.
Listing is the first thing to check. Historic England's register holds 183 listed buildings across the area: one at Grade I, two at Grade II star and 180 at Grade II. Grade II is the workaday tier and it is where almost all of the town's protected homes sit, which matters because listing applies to the whole building inside and out, not just the bit facing the street. Listed building consent is needed for alterations that affect its character, and that can include internal walls, staircases, windows and rooflights. Replacing like with like is usually the path of least resistance. Replacing timber sashes with plastic ones is the conversation nobody wins.
Beyond the listed buildings themselves, one conservation area covers the town, and that changes the rules for unlisted homes inside it too. Conservation area status typically narrows what can be done without consent, particularly demolition, cladding, and work to trees, and it puts the appearance of the street into the decision in a way that does not happen elsewhere. What a neighbour got through five years ago is a guide to local taste, not a precedent you can cite.
Two scheduled monuments also sit within the area. That is the strictest protection tier in the system, and it matters mainly if your plot happens to sit near one, in which case the works consent process is a separate and less forgiving one.
The reassuring part is the volume of activity. Cornwall Council's planning register recorded 552 applications across this area between April 2024 and June 2026, including 208 in the most recent twelve months. Whatever the constraints look like on paper, people here are extending, converting and reroofing at a steady clip. This is not a town where the planning system has frozen everyone in place.
Ground conditions add one more step that catches incomers out. Every postcode in the area sits within the footprint of recorded mining, with an average of about five abandoned workings within 500 metres and the nearest averaging around 120 metres away. In 158 postcodes a recorded working passes directly beneath, with as many as seven under a single postcode. In practice that means a mining search on purchase, sometimes a specialist report, and occasionally a lender or insurer asking for one before they proceed. It is a process to budget time for, not a verdict on any individual house.
The practical summary is this: on an unlisted house outside the conservation area, ordinary permitted development rights do much of the work, and a modest rear extension or loft conversion is a normal project. Inside the conservation area, or on anything listed, assume consent is needed and design for the answer rather than against it. Getting a pre-application view from the council before an architect gets expensive is the cheapest hour anyone spends here.
Freedom to alter a home here lands in the middle: real constraints across a compact historic core, real and regular consent being granted, and a clear divide between the houses where you design around the rules and the houses where you barely notice them.