Question 1

Should I use concrete or slabs for a shed base?

Accepted Answer

Concrete provides a stronger, more permanent base and is better for larger sheds or workshops. Paving slabs are easier to lay yourself and can be repositioned. For sheds under 8x6 feet, slabs on a sand bed are usually sufficient. Larger sheds benefit from a poured concrete base.

Question 2

How thick should a concrete shed base be?

Accepted Answer

A concrete shed base should be at least 75-100mm (3-4 inches) thick for a standard garden shed. For heavier structures like workshops or summerhouses, increase this to 150mm. The base should extend 50-100mm beyond the shed walls on all sides.

Question 3

How much overhang should a shed base have?

Accepted Answer

A shed base should overhang the shed footprint by 50-100mm on each side. This allows rainwater to drip clear of the base rather than pooling under the shed. It also makes positioning the shed easier and provides a small margin for error.

Shed Base Calculator

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