How to Build a Strong Base for Your Garden Storage or Shed

Before you think about what type of garden shed or storage box to buy, it’s essential to prepare the right base. The groundwork underneath is what determines how long your storage will last — and that’s where UK Building Supplies comes in.

We supply all the sand, cement, and aggregates you’ll need to create a rock-solid, level, and weatherproof foundation that’ll stand up to the elements for years to come.

Buy all your aggregates here

Why the Right Base Matters

A shed or outdoor storage box is only as good as what it sits on. Without a proper base, you risk movement, dampness, and uneven wear over time. Common issues include:

• Sinking or movement if the soil isn’t compacted correctly

• Water damage or mould from poor drainage

• Warping of timber or cracking of resin storage boxes

The solution is simple — start with a professional-grade base made from quality materials.

Step 1 – Prepare and Level the Area

Clear the area of grass and debris, then dig down around 100mm–150mm. Use MOT Type 1 hardcore as your sub-base material. It compacts tightly to create a stable surface that won’t shift or sink.

You can order MOT Type 1 in bulk bags directly from UK Building Supplies for fast nationwide delivery.

Step 2 – Add Sharp Sand for a Smooth Finish

Once your MOT Type 1 is compacted, add a thin layer of sharp sand on top — around 25mm is ideal. This helps you achieve a level surface for laying slabs or concrete.

We stock high-quality sharp sand that’s perfect for use under paving, slabs, and shed bases.

Step 3 – Secure with Cement or Paving Slabs

Depending on the style of your storage area, you’ve got two main options:

• Concrete Base: Mix cement with ballast for a traditional poured concrete pad that’s extremely strong.

• Paved Base: Lay paving slabs or blocks on a sand and cement mortar mix.

Both options give you a professional, long-lasting finish suitable for everything from small storage boxes to full-sized garden workshops.

All our cement and aggregates are available in convenient bags with delivery direct to your door — no collections needed.

Step 4 – Compact and Seal

Once your base is complete, use a wacker plate to compact everything firmly. For paved areas, finish the joints with Azpects EasyJoint for a clean, weed-free finish that drains well and looks professional.

Why Choose UK Building Supplies?

At UK Building Supplies, we make it simple to order everything you need for shed bases and garden storage areas:

✅ Bulk bags of MOT Type 1, sharp sand, and ballast
✅ Premium cement for reliable strength and bonding
✅ Fast, nationwide delivery-only service — no collections
✅ Trusted suppliers and unbeatable online prices

Whether you’re preparing a base for a shed, garden storage, or bin store, you’ll find the right materials here — all ready to order online and delivered straight to your home or site.