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

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

Customise this programme:

Residential

Commercial

Packages

Start date

Typical durations for a well-run job — actual programmes vary with site, weather and lead times.

Adjust stage durations

Site set-up & demolition3d (3–5)Excavation & footings5d (5–8)Foundations poured & cured3d (3–5)Drainage & ground floor slab5d (5–8)Masonry to wallplate10d (10–15)Steels & structural openings2d (2–4)Roof structure & covering5d (5–10)Watertight: windows & doors3d (3–5)First fix (electrics, plumbing, carpentry)5d (5–8)Plastering4d (4–6)Plaster drying5d (5–10)Second fix & kitchen install8d (8–12)Decoration & flooring5d (5–8)Snagging & clean2d (2–4)

Completed In Progress Upcoming

27 Jul12 Aug28 Aug13 Sept30 Sept

Site set-up & demolition

BC: commencement notice

Excavation & footings

BC: excavation inspection

Foundations poured & cured

Drainage & ground floor slab

BC: DPC & drains inspection

Masonry to wallplate

Steels & structural openings

Roof structure & covering

Watertight: windows & doors

First fix (electrics, plumbing, carpentry)

Plastering

Plaster drying

Second fix & kitchen install

Decoration & flooring

Snagging & clean

BC: completion inspection

Turn this into a live tracked project — weekly updates, photos and RAG status your client can follow. Track this build live — free

Double-storey extension →Loft conversion (dormer) →Wraparound extension →Full house refurbishment →New-build house (single plot) →Small residential development (2–6 plots) →