Yes, and with less argument than most of Cornwall puts up. Five listed buildings in the entire village, every one of them at the bottom grade. No conservation area. No scheduled monument. The thing most likely to complicate an extension here is not the planning officer, it is what somebody left under the garden a century ago.
Sticker carries 5 listed buildings. None are grade one, none are grade two star, and all 5 sit at grade two, which is the base tier. Owning one of those means listed building consent applies to alterations inside as well as out, which is a slower and costlier conversation than a straightforward rear extension. Owning any of the other houses in the village means none of that applies to you. There is no conservation area and no scheduled monument recorded here either, so the heritage layer that flattens ambitions in prettier Cornish villages simply is not present. Worth identifying which 5 before you offer, because the constraint attaches to the building, not to the postcode.
People do alter homes around here, continuously. The planning register carries 811 applications across this area between April 2024 and June 2026, with 348 of those in the most recent twelve months. That is a working answer to whether extensions happen in this part of Cornwall. What the volume does not tell you is how any individual application landed, so read it as evidence that the queue exists rather than as a hint about your odds in it.
The ground is the genuine constraint, and unlike the listings it applies to every address in the village. Recorded mine workings sit close to 100% of Sticker's postcodes, the nearest averaging about 14 metres away, and 18 postcodes have a working directly beneath them. In practice that means a mining search on purchase and, quite possibly, a specialist report before anyone digs foundations for an extension. A lender or an insurer may want that paperwork in front of them before committing. None of this predicts subsidence and none of it says the houses are unsound. It says the file is thicker here than in a village that never mined anything. None of the area sits within a coalfield consultation zone, so the coal-specific checks are not the ones in play. On the wider ground hazards the readings are calm: shrink-swell sits at the lowest class, landslide potential reaches class two, and nothing anywhere in the village reaches class three or above.
For an ordinary house here, permitted development is the starting point and there is no heritage layer stacked on top of it. Anything beyond that goes to Cornwall Council for consent in the usual way, on the usual grounds of scale, overlooking and what the plot can absorb. The document most likely to redraw your plans is the ground report, not the planning decision, and it is the one people leave until last.
Freedom to alter a house is one of the better things Sticker offers, with a heritage constraint that runs to 5 buildings and stops there. The village will let you build. It would just like a word about the trench first.