Barn conversion: typically 24–34 weeks.

Stage-by-stage

1. Site set-up & protection3–5 days
2. Strip-out & structural survey confirmationBat/ecology conditions often constrain start dates5–8 days
3. Structural repairs & underpinningThe big unknown in any barn — allow contingency10–20 days
4. ◆ BC: structural inspectioninspection / milestone
5. New openings & steel frames6–10 days
6. Roof repairs & insulation build-up10–15 days
7. New floor slab & DPM6–9 days
8. ◆ BC: DPC/slab inspectioninspection / milestone
9. Glazing & external doorsBespoke glazing for barn openings: long lead times4–6 days
10. Internal framing & insulation8–12 days
11. First fix & new services connectionsOff-mains drainage/treatment plant adds time if needed8–12 days
12. Plastering & drying10–15 days
13. Second fix, kitchen & bathrooms12–16 days
14. Decoration & floors8–12 days
15. External works & drainage6–10 days
16. Snagging & completion3–5 days
17. ◆ BC: completion certificateinspection / milestone