Yes, you can extend a house in Istead Rise, and almost nothing stands in the way beyond ordinary planning rules. Only three buildings are listed. None is above the lowest grade. There is no conservation area at all. The village has spent the last two years proving it, one planning application at a time.
Historic England lists 3 buildings in Istead Rise. All 3 are Grade II, with none at Grade II* and none at Grade I. Listing means any change that affects a building's character, inside or out, needs listed building consent on top of any planning permission, so for the owners of those three it is a slower and more expensive business. For everyone else it doesn't apply. There are no conservation areas and no scheduled monuments inside the area either. A village built mostly after the war has had little time to produce anything a heritage inspector would cross the road for.
The planning records show what the neighbours are up to. Between April 2024 and June 2026, 694 planning applications were logged for the Istead Rise area, 364 of them in the last 12 months. Residents are plainly changing their houses rather than just thinking about it. In a village where nearly everyone owns their home and three bedrooms is the standard size, the builder's van is about as common as the postman.
In practice, that leaves most homes here working under the normal national rules. Some smaller extensions, loft work and outbuildings can go ahead as permitted development without a full application, while anything larger or closer to a boundary needs planning permission from Gravesham Borough Council. Building regulations apply either way. The catch to look for is on the estate itself. Permitted development rights can be removed by a condition on the original planning consent or restricted by a covenant in the title, so ask the council for the property's planning history and have your solicitor read the title for any restriction on alterations. A clean heritage record does not stop a 1960s planning condition from saying no.
Freedom to change your house is close to the top of what Istead Rise offers. If the house you buy turns out too small, the village will mostly let you put that right.