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Programme template

Single-storey rear extension: typically 12–16 weeks.

Typical masonry single-storey rear extension with pitched or flat roof, new kitchen space and bifolds.

Durations are typical ranges for a well-run job with normal lead times — actual programmes vary with site conditions, weather and procurement.

Stage-by-stage

  1. Site set-up & demolition3–5 days
  2. ◆ BC: commencement noticeinspection / milestone
  3. Excavation & footingsWeather-sensitive; allow float in winter5–8 days
  4. ◆ BC: excavation inspectioninspection / milestone
  5. Foundations poured & cured3–5 days
  6. Drainage & ground floor slab5–8 days
  7. ◆ BC: DPC & drains inspectioninspection / milestone
  8. Masonry to wallplate10–15 days
  9. Steels & structural openingsSteel fabrication lead time runs in parallel — order early2–4 days
  10. Roof structure & covering5–10 days
  11. Watertight: windows & doorsGlazing lead times of 4–8 weeks — order at footings stage3–5 days
  12. First fix (electrics, plumbing, carpentry)5–8 days
  13. Plastering4–6 days
  14. Plaster dryingLonger in cold months — don't rush second fix5–10 days
  15. Second fix & kitchen install8–12 days
  16. Decoration & flooring5–8 days
  17. Snagging & clean2–4 days
  18. ◆ BC: completion inspectioninspection / milestone

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