4 x 3 m garden room: what to buy for the shell
The studs, sheets, cladding, roof, insulation and base for a 4 x 3 m garden room shell, counted with United Kingdom practice. Free, no sign-up, and nothing is priced until you add your own rates.
United Kingdom · 2.3 m walls · Treated feather edge · Flat roof
Popular in United Kingdom
Custom design47 × 100 mm studs · 2400 × 1200 mm OSB3 sheets
The shell materials list
- Floor area
- 12 m²
- Wall studs
- 48 at 2.36 m
- Floor joists
- 11 at 3 m
- Roof joists
- 11 at 3.6 m
- Sheets (walls, floor, roof)
- 22
- Cladding
- 67 boards
- Insulation
- 11 packs
- Base
- 12 ground screws
Outside of the frame
47 × 100 mm studs at 400 mm centres
47 × 150 mm joists
Flat roof
2400 × 1200 mm OSB3 sheets
Treated feather edge, openings taken off
packs of 100 mm insulation
Ground screws; pads or a slab in the calculator
Shell only: no electrics, plumbing or structural design. Check planning and building rules for your site.
Building this 4 x 3 m garden room?
$9The list above tells you what to buy. The Full Build Pack tells you how to cut it and put it together.
- Dimensioned frame plan and cut list for studs, joists and sheets
- The diagonal to square the base before anything is fixed
- Yard order sheet to tick off, plus a CSV for the merchant
- Build order, stage by stage, with the check for each one
One payment, no subscription, no account needed first. The pack is delivered immediately after payment. Preview a sample pack
What the pack holds for this 4 x 3 m room
Worked out from the same numbers as the list above. No estimates, no prices you did not enter.
Yard order sheet
Every stud, joist, sheet, board and fixing in stock lengths your merchant sells.
Cut list
Which piece comes out of which length, so offcuts are planned, not wasted.
Dimensioned plan and elevations
Wall lengths, opening positions and heights to set out on site.
Build order
Base, floor, walls, roof, cladding, in the order the trades need them.
Merchant CSV
Paste the list into a supplier quote request or your own spreadsheet.
Change it and see it in 3D
The calculator opens with this room and style already set. Change the cladding, roof, base, doors or windows and the full list updates. The order-ready PDF and CSV are in the complete pack.
Open this room in 3D