There are many issues associated with loft conversions. Building regulation
approval is essential, which may involve work in the following areas:
1. Floor joist strengthening
2. Insulation of roof.
3. Ventilation of roof timbers.
4. Fire escapes (usually by)
(a) Making the house stairwell fire resistant (no open plan
(b) Including a low down window for rescue by ladder/fire engine
5. Fireproofing the floor
6. Windows (velux/dormer, including 4(b) above).
7. Mains linked smoke detectors.
8. Adding staircase, including fireproof door at top or bottom.
9. Ensuring foundations are adequete/underpinning
Obviously, there is other work as well, which building control may be less
interested in, or alternatively is optional depending on your needs.
1. Removing loft tanks and fixing CH/water systems to cope without.
2. Adding plumbing for en-suite/additional bathroom
Often, you'll find it simply isn't possible to meet the requirements.
However, if you can, you'll end up with a proper useful room that will add
substantial value to your home. In most areas (ask a surveyor for
specifics), the property value increase will exceed the cost of the works.