Yes, for most houses, provided the plans survive the view. Most homes here are not listed. There is no conservation area in the village. The whole place sits inside a protected landscape, and that is the one that bites. The listed buildings get the attention; the hillside does the vetoing.
Speldhurst has 52 listed buildings: none at Grade I, 3 at Grade II* and 49 at Grade II. Listing covers the whole building, inside and out, so changing a listed home means listed building consent as well as any planning permission, and that applies to replacement windows and knocked-through walls as much as to a new wing. The three Grade II* entries are the ones where the heritage officer will read every line of the application. For the other 49, the scrutiny is a notch lower and still a great deal more than a new-build owner ever meets. Buyers who fell for the beams should budget for the paperwork that comes with them.
The good news is that there is no conservation area recorded here, so an ordinary unlisted house is not caught by the extra controls that come with one. The catch is that the entire village sits within the High Weald Area of Outstanding Natural Beauty, and designated landscapes carry tighter rules on how far a house can grow before it needs a full application, and closer attention to how the result looks from across the valley.
Nobody is being put off. The planning register logged 934 applications for the area between April 2024 and June 2026, and 399 in the most recent twelve months. That is a lot of households drawing up plans, and a lot of neighbours reading them. In a village this settled, the consultation letter through the door is the local newspaper.
In practice, the rules split by house. An unlisted post-war detached house can often do modest work under permitted development, though the protected-landscape rules mean it is worth confirming with the council before assuming a side extension or loft dormer comes free. A listed cottage needs consent for almost anything visible and a fair amount that is not. Either way, the sensible order is to check the listing status and the council's view first, then fall in love with the architect's drawings, rather than the other way round.
Freedom to extend in Speldhurst is middling: most houses can grow, a few are tightly bound, and the landscape reviews every plan whatever the house.