Do I Need a Shed Base on Slabs? (UK Advice)
If you're planning to install a garden shed, one of the most common questions is whether you need a shed base on paving slabs. The answer depends on your shed size, ground conditions, and how long you want it to last.
Do You Need a Shed Base on Slabs?
In most UK gardens, yes — a shed base made from paving slabs is recommended. Slabs provide a stable, level platform that protects the shed from ground moisture and movement.
- Prevents sinking and uneven floors
- Reduces damp and rot in timber floors
- Extends the life of your shed
If your shed is small and lightweight, alternatives like pressure-treated bearers may work — but for anything over 6x4ft, a slab base is strongly recommended.
When a Slab Base Is the Best Choice
- Medium to large garden sheds
- Workshops or storage sheds with heavy contents
- Uneven or soft garden ground
- Areas with poor drainage
Ideal for: Workshop Sheds, Large Sheds and Security Sheds.
How Thick Should a Slab Base Be?
| Layer | Recommended Depth |
|---|---|
| Excavation | 150–200mm |
| Type 1 Sub-base | 100mm (compacted) |
| Sand or Mortar Bed | 25–40mm |
| Paving Slabs | 35–50mm |
For official installation guidance, see: Paving Expert – Laying Flags
Do I Need a Base for All Sheds?
Not always — but for most sheds, a solid base is strongly recommended.
- Small tool sheds: Can sometimes sit on treated bearers.
- Medium sheds: Best on slabs or concrete.
- Large or heavy sheds: Require a solid slab or reinforced base.
Browse suitable options: Small Sheds | Medium Sheds | Large Sheds
Common Mistakes to Avoid
- Skipping the sub-base entirely
- Placing slabs directly on soil
- Not checking for level in multiple directions
- Installing the shed before the base has settled
If you want a professional finish, consider our full service: Delivery & Installation
Recommended Shed Types for Slab Bases
Slab bases work particularly well with:
Final Advice
A slab base is one of the most reliable foundations for a garden shed. When installed correctly, it prevents movement, improves longevity, and keeps your shed level for years.
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