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We replaced a dormer flat roof, width of a single terraced house in West London about a year ago. It'll depend on damage - to redo just the felt (with either new felt or whatever the more modern version was), I think the quotes were about 2-3kish.
Ours was in bad condition and the wood underneath was rotten and also had to be replaced along with all the bits of render and other stuff that goes on on a roof. They didn't know this till the felt was removed. It cost just under 6K. It took about three days I think, but the scaffolder then inevitably took a couple more weeks to pick up his tower. It was less than I feared it would cost actually.
The inside of our room looked similar to yours for what it's worth - little pools of staining and lines along the joins. It dried up after a while and has been repainted and it's fine.
The roofer said it could have been worse if the beams had also rotted, but you wouldn't have known that until the roof came off.
What's the ball-park price bracket for replacing a flat roof on a dormer conversion? Place we're looking at has an (internally) nice looking conversion - 6 years old, but looking on Google maps the roof already looks a bit like water has been pooling. I guess this is a survey thing but I'd rather have it factored in to any offer we make from the off as a contingency.
Also noticed some cracks in the ceilings below, possibly nothing to worry about but concerning if it's due to loading from the loft conversion.
What should I be asking to see - building regs certificate, structural drawings, ...?
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