Warwick lofts split cleanly between the historic core and everything else, and the core is the harder half.
The post fire buildings have cut roofs, often steeper than a modern roof and sometimes with the original timbers still in place. Where those timbers are historic fabric, and in a listed building they are, the conversion has to work around them rather than through them. That is a design problem with good answers, and it is not a job to price without going up there.
Head height needs measuring rather than assuming, in any building. A roof can look generous from the hatch and still leave you short of two metres along the walking line once the floor build up and the insulation are in.
Out at Warwick Gates and Woodloes Park the roofs are trussed, which means the structure gets reworked rather than strengthened. Normal work, and not the same job as a cut roof.
The permitted development volume allowance is forty cubic metres on a terrace and fifty on a semi or detached house. A dormer facing the road is not permitted development anywhere, and in the Warwick conservation area, where the roofscape of the post fire town is a large part of what is being protected, anything visible from the street will be examined hard. On a listed building a rooflight is a consent matter too. Our loft conversion page goes through the structural options.