Slabs for a 14 × 10 ft shed base, by slab size
A 14 × 10 ft shed is a large workshop or garden room. The base here is 4.2 × 3.0 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 | 7 × 5, no cuts | 35 | 38 |
| 450 × 450 mm | Needs cuts | 63 | 66 |
| 400 × 400 mm | Needs cuts | 79 | 83 |
| 300 × 300 mm | 14 × 10, no cuts | 140 | 145 |
| 600 × 300 mm | 7 × 10, no cuts | 70 | 74 |
| 900 × 600 mm | Needs cuts | 24 | 25 |
Thirty-five slabs: a big base to keep flat
Seven by five is 35 slabs, and the calculator's count is 38. Over 12.6 m² the hard part is keeping the whole surface in one plane, so set level pegs or string lines across the sub-base before you start, and check each row against them.
The materials are a delivery, not a car-boot run: 2.91 tonnes of MOT Type 1 (4 bulk bags of 0.8 tonnes) and 0.64 tonnes of sharp sand. A concrete base the same size is 1.39 m³, an order of 1.50 m³ of ready-mix, and is worth a quote at this size.
Sub-base and bed for 4.2 × 3.0 m
| Layer | Quantity |
|---|---|
| MOT Type 1 sub-base, 100 mm | 2.91 tonnes |
| MOT Type 1 sub-base, 150 mm (soft ground) | 4.37 tonnes |
| Sharp sand for a 30 mm sand bed | 0.64 tonnes |
| Or a 40 mm mortar bed at 6:1 | 0.94 tonnes of sharp sand and 6 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 14 × 10 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
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Frequently asked questions
How many slabs do I need for a 14x10 shed base?
35 slabs of 600 × 600 mm, laid 7 by 5, cover the 4.2 × 3.0 m base with tight joints and no cuts. Buy 38 to have 3 spares; that is the paving calculator's count with 10 mm joints and 10% extra.
What goes under the slabs for a 14x10 shed base?
About 100 mm of compacted MOT Type 1 (2.91 tonnes for this base) and a 30 mm bed of sharp sand (0.64 tonnes). On soft ground use 150 mm of sub-base, which is 4.37 tonnes.
How many bulk bags of MOT Type 1 for a 14x10 shed base?
4 bulk bags of 0.8 tonnes covers the 2.91 tonnes needed at 100 mm. At 150 mm it is 4.37 tonnes.
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.