Slabs for a 10 × 8 ft shed base, by slab size
A 10 × 8 ft shed is a roomy store or a hobby workshop with space to work inside. The base here is 3.0 × 2.4 m, converted at 0.3 m per foot, which leaves it marginally smaller than the shed floor as most shed makers ask (check your shed's instructions). The layout column shows where whole slabs fit with tight joints; the last column is the paving calculator's count with 10 mm joints and 10% for cuts and breakage.
| Slab size | Layout | Slabs by area | Slabs to buy |
|---|---|---|---|
| 600 × 600 mm | 5 × 4, no cuts | 20 | 22 |
| 450 × 450 mm | Needs cuts | 36 | 38 |
| 400 × 400 mm | Needs cuts | 45 | 48 |
| 300 × 300 mm | 10 × 8, no cuts | 80 | 83 |
| 600 × 300 mm | 5 × 8, no cuts | 40 | 42 |
| 900 × 600 mm | Needs cuts | 14 | 15 |
Twenty slabs and a proper sub-base
Five along and four across is 20 slabs with tight joints and no cuts; the calculator's 22 allows for joints and spares. At 7.2 m² the sub-base is the bigger part of the order: 1.66 tonnes of MOT Type 1 at 100 mm, which is 3 bulk bags of 0.8 tonnes.
On soft or made-up ground, go to 150 mm of sub-base, which takes 2.49 tonnes. A workshop this size often holds a bench and heavy tools, and the sub-base is what stops the slabs under them settling.
Sub-base and bed for 3.0 × 2.4 m
| Layer | Quantity |
|---|---|
| MOT Type 1 sub-base, 100 mm | 1.66 tonnes |
| MOT Type 1 sub-base, 150 mm (soft ground) | 2.49 tonnes |
| Sharp sand for a 30 mm sand bed | 0.36 tonnes |
| Or a 40 mm mortar bed at 6:1 | 0.54 tonnes of sharp sand and 4 bags of 25 kg cement |
Quantities include 5% extra. Check for buried services before you dig, using the free LSBUD service. Shed base options compared weighs slabs against concrete, a plastic grid and a timber frame, and the concrete version of this base is on how much concrete for a 10 × 8 ft shed base.
Want to change anything else? The calculator above is the full Paving Slab Calculator (UK): edit any number and the results update instantly.
Tools & materials for this project
Affiliate links As an Amazon Associate we earn from qualifying purchases. These links do not change what you pay.
Frequently asked questions
How many slabs do I need for a 10x8 shed base?
20 slabs of 600 × 600 mm, laid 5 by 4, cover the 3.0 × 2.4 m base with tight joints and no cuts. Buy 22 to have 2 spares; that is the paving calculator's count with 10 mm joints and 10% extra.
What goes under the slabs for a 10x8 shed base?
About 100 mm of compacted MOT Type 1 (1.66 tonnes for this base) and a 30 mm bed of sharp sand (0.36 tonnes). On soft ground use 150 mm of sub-base, which is 2.49 tonnes.
How much MOT Type 1 for a 10x8 shed base at 150 mm?
About 2.49 tonnes for the 3.0 × 2.4 m base at 150 mm compacted, against 1.66 tonnes at 100 mm. Both include 5% extra.
Related sizes and guides
Estimates only. Results assume standard materials and simple shapes. Supplier products vary, and the final call on quantity, structure and safety is yours. Check the Building Regulations and your supplier's guidance before ordering.