A good shed base keeps your shed stable, dry, and long-lasting. This guide shows you how to build a shed base, how to build one on grass, how to level the ground, and what to avoid.
If you’re still choosing your shed, check out the full range at MCD Garden Buildings.
Quick Summary
- Pick a flat, well-drained spot
- Remove turf and loose soil
- Use landscaping fabric + gravel for drainage
- Compact and level carefully
- Finish with slabs, blocks, or a timber frame
- Make the base slightly larger than the shed
- Do a quick check each season
Tools & Materials You’ll Need
- Tape measure
- Spirit level
- Spade and rake
- Wheelbarrow
- Tamper / compactor
- Paving slabs or concrete blocks
- Gravel and sharp sand
- Landscaping fabric
- Cement (only for concrete bases)
If you haven’t chosen your shed yet, browse garden sheds from MCD Garden Buildings so you can size the base correctly.
Choose the Right Spot
Picking the right location saves hours of work later. Choose an area that’s:
- Flat or close to flat
- Well-drained
- Away from large trees
- Easy to reach from your garden path
- Not right against a fence line
How to Build a Shed Base on Grass
Step 1 — Mark the area
Use stakes and string. Make it 5–10 cm larger than the shed.
Step 2 — Remove turf
Strip 5–7 cm of turf and roots. Turf left under a base will sink over time.
Step 3 — Add landscaping fabric
This blocks weeds and reduces moisture rising into the shed floor.
Step 4 — Add gravel
Spread 5–8 cm of compactable gravel for drainage and stability.
Step 5 — Level and compact
Rake it level, then compact it. A wacker plate is ideal, but a hand tamper works too.
Step 6 — Add slabs or blocks
Lay paving slabs or concrete blocks. Check every slab with a spirit level. Your shed will only be as level as this stage is.
If you’re planning to install a shed from MCD Garden Buildings, this type of base is suitable for most of our timber buildings.
How to Level the Ground Correctly
- Remove stones, roots, and loose soil
- Use a long straight timber with a level on top to find low spots
- Fill low areas with gravel or sharp sand
- Compact until firm
A proper level prevents leaning, sticking doors, and uneven floors.
Make Your Shed Base Last Longer
- Use treated timber or weather-resistant materials
- Always include a drainage layer
- Keep the base slightly larger than the shed
- Add concrete footings in high-moisture areas
- Double-check the level before installation
Common Mistakes to Avoid
- Building on turf
- Skipping gravel or drainage
- Not compacting the ground
- Using untreated timber
- Guessing material quantities
Avoid these and your shed will last much longer without movement or rot.
Seasonal Maintenance
- Check for ground movement after winter
- Re-compact gravel if needed
- Make sure no water is pooling around the base
- Look for rot or damage once a year
Need a Shed for Your New Base?
Once your base is ready, you can choose a shed that fits perfectly. Explore MCD’s shed range or get personalised help via their contact page.
