Build a Shed Estimator

Full material list for a timber shed — floor, framing, cladding, roof sheathing, felt and fixings — from the shed size and roof style.

Part of:Project Estimators hub
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How to Use This Calculator

How to Use

  1. Choose metric or imperial units.
  2. Enter the shed width, depth and wall height.
  3. Pick the roof style — apex (ridged) or pent (single slope).

What this estimates

This gives a complete material list for a timber-framed shed: floor joists and base sheets, wall studs and cladding, plus roof sheathing and felt. Framing is based on 400 mm (16 in) centres and sheets are standard 8 × 4 ft boards. Add about 10% for offcuts and order door, window and fixing packs separately.

Common Questions

What spacing should shed wall studs be?

Studs at 400 mm (16 in) centres are standard for sheds and give a strong frame for cladding and lining.

How much extra material should I buy?

Allow roughly 10% extra on sheet goods and timber for cuts, plus a separate budget for door furniture, felt nails, screws and treatment.

Apex or pent roof — which uses less material?

A pent (single-slope) roof uses slightly less material and is simpler to build; an apex roof gives more headroom and better water run-off.

Do I need a base for a shed?

Yes — a level, firm base such as concrete, paving slabs or a timber frame on bearers keeps the shed dry and square. The estimator covers the floor structure.

What roof pitch should a shed have?

An apex shed roof is usually 15–30°, while a pent (single-slope) roof needs at least a 10° fall so rainwater runs off.

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