Garden Structures

The UK’s Best Shed Bases For A Stable Garden Building

an unfinished garden shed under construction
Written by Chris Briggs

If you want to build a shed or other type of outdoor building in your garden, then building on stable foundations is vital.

Having a shed in your garden gives you somewhere to store your gardening equipment and other things you don’t want to keep in the house.

Building a shed is quite a straightforward job, but you will need a stable surface to build it on. Thankfully, it’s very easy to get good quality shed bases for a reasonable price now.

Some of the things to consider when buying a shed base are the size, the materials used and the ease of installation.

We’ve rated some of the UK’s best shed bases, looking at their pros and cons as well as their key features.

Last update on 2021-01-07 / Affiliate links / Images / Pricing from Amazon Product Advertising API

Let’s start by looking at our best pick, the Eco Deck Garden Shed Grid…

Best Pick: Eco Deck Garden Shed Grid

Sturdy, versatile and easy to set up

Cost: £71.99

The Eco Deck Garden Shed Grid is our best pick and would make a great choice for a shed base.

Installing it is quite simple, with the squares linking together very easily. Once you have created a foundation, you can lay the membrane down. It’s a good idea to let it settle for a couple of days before adding the grid.  

It comes with free shipping, which is a big bonus considering the size and weight of the squares. It’s made in the UK and constructed from recycled materials.

As well as a shed base, this would also be suitable for use with a greenhouse or any other type of outdoor building as well as on driveways, paths and patios. Some reviewers found the clips supplied weren’t strong enough, so it might be worth investing in cable ties to hold the grids together.

Overall, this is an excellent product and would be ideal if you’re looking for a shed base or you want to protect the grass in a certain part of your garden.


  • Very sturdy and reliable
  • Suitable for use as a base for different types of outdoor buildings, including sheds and greenhouses
  • Easy to install
  • Comes with free shipping


  • The supplied clips for attaching the squares could be better
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Value Pick: CrazyGadget Grass Grid

A very affordable yet high-quality base

Cost: £26.99

The CrazyGadget Grass Grid is our value pick. Considering the low cost of this grid, it’s surprisingly high quality and would make a great choice for most types of sheds and outdoor buildings.

You get eight grids for your money, each one measuring 50cmx50cm and 4cm tall. This gives you enough material to create a base that’s big enough to accommodate most shed sizes.

Installing the grids is very easy and they connect to each other very well to create a sturdy and stable base. They’re made in the UK from heavy-duty plastic and can easily be filled with grass, soil, stone and gravel.

This is an excellent base overall, especially considering the low cost and the fact that it comes with free delivery.


  • Very reasonably priced
  • Comes with free delivery
  • Comes with eight grids in total – suitable for the majority of shed sizes
  • Grids are made in the UK from heavy-duty plastic


  • The small size of the holes means they might not be suitable for filling with larger materials
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QuickJack Shed Base System

An excellent base system that provides superior stability

Cost: £182.99

The QuickJack Shed Base System is quite different from the other bases we’ve looked at so far. Unlike the plastic grids of the CrazyGadget and Eco Deck systems, this is made up of metal jacks that you place into the ground.

Installing the jacks is very easy and doesn’t require any real preparation or specialist equipment. They are also adjustable, so you’re able to use them with different types of buildings.

To use the jacks, you simply install them directly into the ground and then place your wooden base on top of them. The jacks are made up of a bracket, bearing plate and a screw.

Although this system does an excellent job of providing a stable base for a shed, it is quite costly, especially when compared to plastic base grids, so it won’t be for everyone. If you can afford the high cost however, it’s an excellent investment.  


  • Very easy to install
  • Suitable for use with different types of outdoor buildings
  • Provides excellent stability


  • The wood for the base isn’t supplied, so overall it can become quite costly
  • Very expensive compared to plastic base grids
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Eco Deck Heavy Duty Base Grid

An excellent base for larger sheds

Cost: No products found.

Next up is another base from Eco Deck. This base is significantly larger than our best pick, measuring 10×8.6 feet.

Just like the other Eco Deck base we rated – this is made in the UK from completely recycled materials. It’s also very easy to install and can be filled with a variety of materials, including soil and gravel.

The larger size of this base makes it excellent for larger sheds, but it’s also suitable for other outdoor buildings, including log cabins and greenhouses as well as for driveways, paths and patios.

Overall, this would make a great choice of base if you have a shed that’s 10×8 or smaller. It provides excellent stability and is very simple to install.


  • The size means it’s suitable for larger sheds up to 10x8ft in size
  • Very easy to install
  • Can be used for a variety of other outdoor buildings as well as paths, patios and driveways
  • Provides excellent stability


  • Quite expensive for a base of this type
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True Products Eco Shed Base Kit

A versatile and easy-to-use base kit

Cost: No products found.

Lastly, we’re going to look at the True Products Eco Shed Base Kit. This kit consists of heavy-duty plastic grids that are environmentally friendly, weatherproof and sturdy.

You get 24 grids included, with each one measuring 33cmx33cm. This gives you 1 square meter of coverage for every 9 grids.

The grids are very easy to connect to each other, so you can create the exact size of base you need. They can also be filled with a variety of materials, including sand, gravel, soil and turf.  

This base kit would make a good choice if you’re not yet decided on your shed or you want some flexibility in the size of the base.


  • Comes with 24 grids included, giving you plenty of flexibility
  • The grids are sturdy, weatherproof and easy to install
  • Can be filled with a variety of materials, including gravel, stones, sand, soil and grass
  • Suitable for use with all type of outdoor buildings as well as paths, driveways and patios


  • Some reviewers had issues with the stability of this base
  • Might not be suitable for uneven ground
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Things to Consider When Buying a Shed Base

Materials used

The material a base is made from is certainly an important thing to consider. You can use concrete slabs to create a shed base, but there are now some excellent plastic shed bases available, such as the ones we rated above.

The advantage of using a plastic base it that they’re lighter and easier to work with, while still providing enough stability for your shed.


Size is another obvious consideration when buying a shed base. You’ll want to know the exact dimension of the shed you’re building before purchasing the base so you can buy appropriately.

There are a lot of base kits available now that come with grids that connect to each other, so you’re able to easily create the exact size of base you require.

Ease of installation

Ease of installation is something you’ll need to think about too. Some bases are a lot easier to install than others, although generally how easy to install a base is, will depend a lot on how even the surface you’re installing it on is.

Plastic base grids are quite simple to install, since you really only need to connect them together to get the right size and then fill them with the appropriate material to provide stability.

How To Build A Shed Base

If you plan to build a shed in your garden, you’ll first need to have a solid base to build it on.

There are a few different types of shed base you can use. There are base kits that include plastic grids, like those we covered above. You can also use a wooden frame or concrete slabs. Using concrete slabs is a very traditional way to build a shed base and although it takes some initial work, it does provide excellent stability in the long term.

Below are the steps involved in building a shed base using concrete slabs.

Necessary tools

The tools and equipment you’ll need to build a shed base are as follows –

  • String
  • Wooden stakes
  • Aggregate
  • Fork
  • Shovel
  • Spade
  • Spirit level
  • Tape measure
  • Concrete slabs

Marking out the area

The first step is to mark out the area where the base is going to be built. You can do this using your tape measure, string and wooden stakes. Measure out a square and place your stakes at each corner. Then wrap the string around each stake to create the square.

Digging the soil

Once you’ve marked out the area where you want the base to be, you’ll need to dig the soil to the correct depth. 100mm is a good depth, since it allows enough room for the slabs that make up the base as well as the sand/cement mix and aggregate.

Creating the base

After you’ve dug the soil, you can then start laying down the base. First you should pour the aggregate dust into the hole, making sure to cover the entire area and that it’s smoothed out. You can help to compact it by using a wooden plank and a hammer.

After this, you should add the sane/cement mix on top. You should use a mix that’s roughly nine parts sand to one parts cement. Make sure to smooth it out so the surface is even and level.

Lastly, you need to lay down the slabs. Make sure the slabs are properly positioned and firmly in place. Once they’re all down, you should then fill in the gaps with your sand/cement mix.

Building A Base On A Slight Slope

Ideally, you would have flat ground to build a shed base on, but this isn’t always the case. If you need to build on a slope, then there are a couple of reliable methods you can use. Below is an explanation of each.

Retaining wall

Using a retaining wall is an excellent method for building on a slope. By cutting into the ground, you’re able to create a level platform to build the base on.

To do this you’ll need to first dig a flat surface into the soil. Then build the retaining wall that your shed will be built against. Retaining walls are generally only suitable for sheds that have walls that are 1m or less.

Foundation blocks

The other method for building a shed base on a slope is to use foundation blocks. Using foundation blocks gives you a lot of flexibility since you can use as many as you need depending on how steep the slope is.

The first step is to mark out where your base is going to be built, so you know where to place the blocks. You can do this using string and wooden stakes. You should dig the top layer of soil to make sure the blocks have an even surface to be placed on.

Make sure you dig holes that are big enough to accommodate the blocks and fill them with pea gravel to create a flat surface. When you’re certain that everything is level, you can then start building the base.

About the author

Chris Briggs

Chris loves the outdoors and exploring nature. He is a freelance writer and has written extensively on subjects including travel, DIY and gardening.

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