Yes, and heritage rules will rarely be what stops you. Only nine buildings are listed. None of them are in the top grades. There's no conservation area. The neighbours are already extending. If a project gets stuck here, it'll more likely be over the fence than over history.
Three Mile Cross has nine listed buildings. None are Grade I and none are Grade II*, so all nine are Grade II, the standard grade for buildings of special interest. Owning one of those nine changes everything: listed building consent covers works inside as well as out, and changes that would be routine elsewhere, such as windows, walls or a new opening, need approval first. If your house isn't one of them, and in a village made up mostly of modern homes most aren't, listing doesn't affect you. There's also no conservation area and no scheduled monument in the area, so you won't find a hidden heritage zone setting rules for your street.
The planning records show that people here apply to alter their homes all the time. There were 1,437 applications between April 2024 and June 2026, and 632 of them came in the last twelve months. Those are submissions, not results, and they say nothing about how many were approved. What they do show is that altering a home here is common, and a scaffold on your drive won't make you stand out.
In practice, most homes that aren't listed are likely to rely on permitted development rights for smaller projects, such as modest rear extensions and loft conversions within set limits, with anything larger going through a standard planning application. The catch in a village built mostly in recent decades is that the heritage list isn't always the only constraint. Some estates had permitted development rights removed by a condition when the original permission was granted, and some titles carry covenants that limit alterations. Check both before paying an architect for drawings. The nine listed buildings aren't the problem here. The small print on a newer house can be.
Your freedom to extend in Three Mile Cross is one of its real strengths: very few listed buildings, no conservation area, and a planning register full of neighbours who have already made their homes bigger.