Yes, in most cases, and the assumption that a Cornish fishing village is one continuous preservation order is wrong. Twenty-five listed buildings across the area, none of them at the top grade. One conservation area, carrying the village's own name. Hundreds of planning applications have gone through the local system in the past two years. Heritage here is a hard constraint on a minority of houses and a paperwork tax on everybody else.
The listing register for the area carries 25 buildings. None are grade one. Two are grade two star and 23 are grade two, which is the ordinary end of the scale and by far the most common. Buying one changes the job entirely: listing covers the whole building inside and out, along with things attached to it, so windows, internal walls, staircases, chimneys and the outbuilding leaning on the gable all fall inside it. Listed building consent is a separate application from planning permission, and plenty of schemes need both. Buy any of the other houses and none of that applies to you, because 25 buildings does not stretch far across a village.
One conservation area covers Gorran Haven, and designation is the constraint most owners here will actually meet. It does not freeze the place. It changes who gets a say. Some permitted development rights are trimmed, demolition needs consent, work to trees requires notice, and the choice of materials and window frames stops being entirely yours. The test being applied is whether a change harms the character of the area, which is a judgement rather than a measurement, and judgements take longer than measurements.
For evidence that people do alter houses around here rather than admiring them in aspic, the planning register logged 811 applications across the local planning area between April 2024 and June 2026, with 348 of those in the most recent twelve months. That is a system in constant use. What those counts cannot tell you is what happened to any individual application, so read the volume as proof of activity and draw no conclusions about your own odds from it.
In practice the order of work is simple. Establish whether the house is listed, establish whether it sits inside the conservation area boundary, then find out whether your specific idea survives both. Most houses here are not listed, so the standard permitted development rules apply, narrowed where work is visible from the street or involves demolition or trees. A pre-application conversation with the council costs less than a full set of drawings for a scheme that was never going anywhere, and the people who skip that step are the ones who end up telling the story at length in the pub.
Freedom to alter a home here is middling: better than the cottage-and-harbour aesthetic suggests, worse than a modern estate where nobody cares what happens at the back. Check the listing and the boundary before you offer, and what remains is the ordinary negotiation with a planning officer that the whole country is having.