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I genuinely cannot understand how they get away with charging 90 grand.
The materials are about 15 to 20k give or take including the wood, cladding and steel. Add 5k in professional fees, building control and plans.
These L shapes take about 5 to 8 weeks. 4 blokes on 200 quid or so a day every day is 800 notes wages a week. Call it a grand. Thats 8k in wages for them to screw it together. Call it 18k with basic windows and the roof and the scaffolding, 5 days of electrical work and the same of plumbing. Call it 20k with tiling.
Where does the other 50 grand go?
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The £90K is all-in, with tiles/sanitaryware/paint etc that are all extras, which adds up. Also includes stuff like council skip permits etc, which isn't insignificant.
4 people @ £200/day * 10 weeks (these things rarely actually take 8 weeks to full completion, unless it's a cowboy rush job) = £40K wage bill, and that's only counting 5 days a week; most residential sites I see have people working Saturdays too. Skilled trades charge significantly more.
Outfits like Bespoke who bang out 70x lofts a year and sub out most of the work make ~10% profit if they're lucky, which works out OK due to the high volume.
Small-time independent builders are either using very cheap labour, very few workers (taking much longer), operating at break-even to establish themselves, cutting corners, charging shitloads or any combo of above.
My friends have just completed theirs in E17, done by Bespoke Lofts; double dormer with en-suite, basic finishes, cold roof with felt etc. Cost ~£90K.