Nearly all lofts or attics can be converted as long as they are not breaching planning or conservation guidelines. However, it depends also on the height of the ridge. If you were to stand in the centre of the roof and measure from the top of the existing ceiling joists to the top of the ridge board at the apex of the roof and you have a minimum of 2.2 metres, then the loft can be converted. 2.2m for a traditional roof, measure from the underside of the ridge member to the top of the ceiling joist. A truss roof will be 2.4m