The first question on a Coventry loft is which roof you have, because the city has both kinds in quantity and they are completely different jobs.
The Victorian and Edwardian terraces have cut roofs: rafters and purlins, with space between them that can be opened up and strengthened. These are usually the better conversions, when the head height is there. Measure before you get attached to the idea, because a steep roof can look generous from the loft hatch and still leave you short of two metres along the walking line once the floor build up and the insulation are in.
The interwar and post-war housing out through Tile Hill, Wyken and Cheylesmore is largely trussed. A trussed roof has no usable space until the structure is reworked, and reworking it is a proper structural job rather than a matter of boarding out. It is entirely doable and we do it regularly, but anybody quoting a trussed roof at the same rate as a cut roof has not been up there.
The permitted development volume allowance is forty cubic metres on a terrace and fifty on a semi or detached house. A dormer on the roof slope facing the road is not permitted development anywhere, and inside one of Coventry’s conservation areas anything that changes the roofline the street can see will be looked at closely. Rear dormers and rooflights are a far easier conversation.
Our loft conversion page goes through the structural options and the order the work happens in.