You can extend a house in Melbourn, but for many homes you will need permission first. The area has hundreds of listed buildings. Six conservation areas lie in and around it. A dozen scheduled monuments are scattered across the fields. The neighbours keep applying anyway, which suggests the process is slow but survivable.
Historic England's list puts 234 listed buildings in the Melbourn area, which on this page also covers Meldreth, Shepreth and Fowlmere. Two are Grade I, seven are Grade II* and 225 are Grade II. Listing protects the whole building, inside and out, so changes that affect its character need listed building consent as well as any planning permission, and that includes work a homeowner might think of as purely internal. Melbourn appears in Domesday Book, and its older buildings have been protected one listing at a time ever since the system began.
Six conservation areas lie in and around the patch: Melbourn, Meldreth and Shepreth, with Bassingbourn, Foxton and Royston nearby. Inside a conservation area the council looks harder at anything visible from the street, and some of the building work that would normally go ahead without an application needs one here. That applies even when the house itself isn't listed.
There are 12 scheduled monuments in and around the area, the strictest tier of protection, and any works affecting one need separate consent. The parish has Bronze Age finds, a Roman settlement on the village edge and an early Christian burial site, so land near a scheduled site is worth taking seriously long before any digging starts.
None of that stops people from trying. South Cambridgeshire's planning records for the area show 1,709 applications between April 2024 and June 2026, 773 of them in the last twelve months. That is a lot of paperwork from people who decided a bigger kitchen was worth the wait.
The ground matters as well. The British Geological Survey's published hazard class for shrink-swell clay reaches class 3 in the Melbourn area, and about 27% of postcodes hit that level. Clay that swells when wet and shrinks when dry can move shallow foundations, so an extension on affected ground may need deeper footings than the builder first quotes, especially near trees. A structural engineer should look at the plot early, and the extra cost belongs in the budget from the start.
In practice, a post-war semi outside the conservation areas can often use permitted development rights for a modest rear extension without a full application. A listed cottage or a house inside a conservation area starts from the other end and needs consent for most visible changes. Historic England's list will show whether a particular house is listed, and the council's conservation area maps will show whether it is inside a boundary. Those two checks decide which kind of project you are buying.
Freedom to extend in Melbourn is below average. Newer houses on the edges have a reasonable chance, and the older houses in the middle of the village need consent for almost any change.