Yes for most houses here, and no for a stubborn minority of them. Almost every protected building in the village sits at the lowest grade of listing. The old core falls inside a conservation area, so the rules follow the street rather than the individual house. Plenty of applications go in locally every year, which tells you people do alter homes here and get on with it. What you give up is the right to do it quietly.
The area carries 29 listed buildings: one at Grade I, one at Grade II star, and 27 at Grade II. That split matters more than the headline. Grade II is the workaday tier, covering houses people actually live in, and it means listed building consent is needed for anything affecting the building's character inside or out, including work that would be nobody's business on an ordinary house. Windows are the usual collision point, followed by internal walls, then anything involving insulation on a solid-walled property. The two higher-graded buildings operate in a different world again, where the answer to most proposals starts at no and has to be argued upwards.
One conservation area covers the historic part of the village, named for Tregony itself. Inside it, permitted development rights are trimmed: cladding, roof alterations, outbuildings and anything facing a public road can need consent that the same work would not need on a house half a mile outside the boundary, and trees come with their own notification regime. The practical test is not how old your house is but which side of an invisible line on a council map it sits on. Check the line before you make an offer, not after you have booked a builder.
There is also one scheduled monument in the surrounding area, which sits at the strictest protection tier in the system. It matters only if you are buying land near it, in which case the constraint applies to the ground rather than to a building, and it is not negotiable in the way planning policy sometimes is.
None of which has stopped anybody. Planning records show 578 applications across this area between April 2024 and June 2026, including 243 in the most recent twelve months. That is a steady stream of people putting in for extensions, alterations and outbuildings rather than a place where nobody bothers trying. The outcomes are not consistently recorded, so nobody should read an approval rate into the volume, but the volume itself is the reassurance: this is a working planning environment, not a museum with a postcode.
One listed building in the area sits on Historic England's Heritage at Risk register, meaning a protected structure in poor condition. For anyone buying it, that can open doors to grant support alongside a great deal of scrutiny. For anyone buying an ordinary house down the road, it is context rather than a problem.
The practical summary is straightforward. If your house is unlisted and outside the conservation area, normal permitted development rights apply and a rear extension is the routine job it would be anywhere. If it is inside the conservation area, assume anything visible needs asking about. If it is listed, assume everything needs asking about, budget for a heritage statement and an architect who has done it before, and accept that period glazing is a permanent condition rather than a phase.
Freedom to alter a home here lands somewhere in the middle: not a village of untouchable facades, but not a blank sheet either, with the answer depending almost entirely on which street you buy in.