Yes, for most homes in Coleford, as long as the ground underneath gets the same attention as the drawings. The town has a couple of dozen listed buildings and none of them in the top grades. There is one conservation area. The neighbours have been sending in planning applications steadily. Old mine workings lie under every postcode.
Historic England lists 23 buildings in Coleford, and all 23 are Grade II. None are Grade I or Grade II*. Grade II still means listed building consent for any change that affects the building's character, inside or out, including the windows and the back extension. For anyone outside those 23 addresses, listing doesn't come into it.
Coleford has one conservation area, named after the town. Inside it, the council takes a closer interest in demolition, trees and changes that alter how a street looks, and some building work that would be automatic elsewhere needs a formal application. In a town built mostly after the war, the conservation area is the old core, and most of the bungalows and semis around it fall outside.
The area also has one scheduled monument, the strictest protection there is. It matters only if the land being built on comes near it.
People in Coleford do extend their homes. The council received 306 planning applications for the area between April 2024 and June 2026, 126 of them in the last twelve months. Those are applications, not approvals, so they show how busy the planning queue is and nothing about how kind it is. Someone on the street is usually about to put up scaffolding.
The ground is the real constraint. Every postcode in Coleford lies in the coalfield and has old mine workings recorded within 500 metres, and in 91 postcodes a recorded working runs directly underneath. Iron was dug here from the Middle Ages and coal from the 16th century, so the old workings are a known part of building anything new. In practice that means a mining search, and possibly a specialist report, as part of the plans. A lender or insurer may want to see both, and new foundations can attract their own questions. The working under a garden is easier to plan around when it is known about at the drawing stage, which is also when finding out costs the least.
The practical picture is simple. A house outside the conservation area and off the listed register can often take a standard rear or side extension under permitted development rights, without a full application. Flats don't get those rights, listed buildings need consent whatever the size of the job, and anything in the conservation area deserves a call to the council's planning team first. Gloucestershire's iron and coal past does more to decide how deep the footings go than the heritage rules do.
Freedom to extend in Coleford is middling. Heritage protection is light and easy to avoid, but the mining legacy under every postcode means even a simple extension starts with paperwork about the ground.