The first stage of any loft conversion is a close inspection of the loft space to find out its exact dimensions and whether loft conversion is feasible. On entering the loft one needs to establish if there is adequate room under the ridge of the roof. A measurement of 2.3 metres is required to allow enough headroom, although you may find that you can still get a useful loft room from as little as 7 feet (2.1 metres), and there must be at least 2 metres clearance above the position of the access stairs. 1.9m above loft staircase is sufficient for one bedroom loft conversion.
Due to the slope of the roof and the required loft conversion access headroom, the feasibility of a loft conversion is dependent upon a minimum height of approximately 2.2 m (7 ft 6 in) measured from the joist to the apex. Providing that this requirement is met, most properties will likely possess the potential to have the loft space converted.