Garden & outdoor
How much wood and roofing for a garden tool shed?
Floor, wall and roof m² plus plywood sheets and foundation blocks for a DIY wooden garden tool shed from length, width and height.
Quick answer
A small wooden tool shed is three surfaces: **floor**, **walls**, and **roof**. A **2 × 1.5 × 2.1 m** lean-to often needs about **3 m² floor**, **~15 m² walls** (minus the door), and **~3.5–4 m² roof** once pitch and overhang are included — then convert to **standard 122×244 cm sheets** with spare for cuts.
Advanced settings
Wall cladding
12.9 m²
- Floor area
- 3 m²
- Roof covering
- 3.4 m²
- ≈ 122×244 cm sheets
- 8
- Corner + intermediate posts
- 4
- Foundation pier blocks
- 6
Related garden tools
Walls = perimeter × height − door (~1.8 m²). Roof = floor × roof factor (lean-to ~1.12, pitched ~1.25) for pitch/overhang. Sheets = (floor + walls + roof) × (1 + waste) ÷ 2.98 m². Posts: 4 corners + extras every ~1.2 m on long sides. Pier blocks ≈ every 1 m along both long sides. DIY estimate only — not a structural or planning certificate.
How it works
Enter length, width and wall height. Pick flat/lean-to or pitched roof. The calculator returns cladding areas, sheet count, corner/intermediate posts and concrete pier blocks for a simple raised base. Check local planning rules and wind/snow loads — this is a DIY shopping estimate, not a structural certificate.
Frequently asked questions
How many OSB sheets for a 2×1.5 m shed?+
Walls + floor + roof often land around 8–12 sheets of 122×244 cm once waste is included — run the calculator with your height and roof type for the exact count.
Flat roof or pitched?+
A slight lean-to (flat with fall) sheds rain with less timber; a pitched roof needs more covering area but sheds snow better. Use roofing felt or bitumen shingles outdoors.
Do I need a concrete foundation?+
Many DIY sheds sit on pressure-treated skids on concrete pier blocks or paving slabs — level and clear of standing water. Full slabs are more work but very stable.
Kit shed or build from sheets?+
Kits are faster; sheet-built sheds cost less per m² if you already have tools. This calculator sizes the DIY sheet approach — compare kit footprints on Amazon too.
As an Amazon Associate I earn from qualifying purchases — the price does not change for you.