If you're dreaming of sunny days splashing in your own above-ground pool, there’s one essential step before the fun begins: getting your ground level. A lopsided pool isn’t just a bit wonky; it can lead to leaks, structural damage, and safety concerns.
Whether you’ve chosen a steel frame pool or a family-sized paddling pool, levelling your garden properly is key to a successful installation.
This guide explains everything you need to know to prepare a safe, level pool base. No specialist skills are required, just a bit of elbow grease, patience, and a few handy tools.
Why does ground levelling matter for an above-ground pool?
Placing a swimming pool on uneven ground can put too much pressure on one side, damaging the liner and potentially causing the entire structure to collapse. Proper levelling protects your pool liner, maintains the pool's structural integrity, and keeps your family safe while swimming.
Plus, having a perfectly flat pool area means less water spillage, reduced heat loss, and a longer-lasting pool.
What you’ll need:
Tools
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Spirit level or carpenter’s level
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Tape measure
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Two-by-four plank (for checking levelness)
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Wide rake
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Shovel
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Sod cutter (optional but useful for grass removal)
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Garden hose
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Rolling tamper or lawn roller
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Wheelbarrow
Materials
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Sand (usually masonry sand or play sand)
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Tarp or ground cloth (to prevent debris poking up)
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Twine and stakes (for marking your pool site)
Step-by-step: How to level ground for an above-ground pool
1. Choose the best location
Look for a designated pool area that is:
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At least 10 feet away from your home
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Clear of power lines, underground utility lines, and septic tanks
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Free from large overhanging trees or structures
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Firm ground - avoid sandy or loose soil
If your garden has a steep slope, consider calling in a professional, but DIY ground levelling is totally doable for most mild inclines.
Tip: Before digging, always call 811 (or your local authority) to mark underground lines.
2. Mark and clear the area
Use twine and stakes to mark out your pool base, then clear the area of:
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Grass
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Sharp objects like stones or sticks
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Other debris
Use a sod cutter or shovel to dig down to the bare soil. Don’t forget to cart the waste away in your wheelbarrow.
3. Check for high and low points
Grab your two-by-four plank and tape a spirit level to the centre. Drag it across your pool area to identify high points and low spots.
Don’t fill in dips. Remove soil from high points instead. This helps prevent future settling, which can cause an unlevel pool over time.
4. Dig and level
Using your shovel, start levelling the ground by shaving down the high spots to match the lowest point. Work in sections and keep checking with your level.
For larger pools, dig about 2 inches deep below the surface so your sand base can sit flush with the lawn.
5. Remove remaining debris
Once level, use a wide rake to remove remaining debris like roots or rocks. This protects the pool liner from punctures.
6. Moisten and tamp the soil
Lightly spray the area with a garden hose to help compact the soil. Then go over the space with your rolling tamper or lawn roller to create a solid foundation.
This step is crucial. Loose soil under a filled pool can lead to shifting and sagging.
7. Add and level the sand
Spread a 1- to 2-inch layer of clean sand over the compacted soil. Use a rake to smooth the surface, then go over it again with the tamper to compact the sand.
Your sand base helps protect the pool liner, insulates the pool, and makes your surface even softer underfoot.
8. Double-check everything
Before you roll out your pool, use your plank and level to double-check the entire area. Even a couple of inches off can cause structural issues.
Happy with it? Lay down your ground cloth or tarp to prevent weeds or moisture from coming up through the soil.
9. Install your pool
You’re now ready for pool installation. Follow your pool manufacturer's instructions carefully. Outdoor Toys’ range of steel frame pools includes everything you need for a sturdy setup.
And if you’ve got an inflatable water slide or paddling pool instead, you can apply the same levelling principles for a smoother, safer splash zone.
Common mistakes to avoid
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Don’t use patio blocks under pool frames, these can tear the liner
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Avoid building up low spots with loose fill like sand or soil, which settles over time
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Don’t skip soil compaction, or you risk an uneven surface
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Check for drainage and avoid areas where standing water collects after rain
Ready to make a splash?
Levelling the ground ready for an above-ground pool might not be the most glamorous summer task, but it’s an essential one. Taking the time to get your pool site right means fewer headaches and more poolside fun.
Once your ground is ready, you’ll be free to dive into the good stuff, whether that’s cannonballs, chill-outs, or inflatable unicorn races.
Explore our full collection of swimming pools, hot tubs, and pool accessories perfect for turning your garden into a summer haven.