If you want to carry out repairs on or re-cover less than 25 per cent of the area of a pitch or flat roof, you will not normally need to submit a building regulations application. You will need approval, however, if:
1. You carry out structural alterations
2. The performance of the new covering will be significantly different to that of the existing covering in the event of a fire
3. You are replacing/ repairing more than 25 per cent of the roof area, in which case, the roof thermal insulation would normally have to be improved.
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