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How to build a Shed Base? - Wednesday, March 26, 2014

Just how do you go about building a shed base that is suitable for a shed? Let us show you.

A shed base is necessary for sheds to maintain a dry interior, prevent rotting and keep the shed anchored down during high winds. For this, the shed needs a dry level foundation. This can be a patio, laying a concrete foundation or paving slaps. We advise that a 100-150mm size increase is provided, bigger than your shed and that you try to lower the edges for easy rain runoff.

Planning the shed base

  • When your shed is delivered, check that all parts are there including nails, screws, hinges and any other ironmongery.
  • Your shed will need to sit on a hard, level base, otherwise the frame will distort and the door and windows won’t open properly.

There are multiple ways of creating a shed base; firstly let us explore a concrete base.

Items required -

  • Spade – Digging around 150mm into the ground making sure it is level.
  • Wooden shuttering – To keep the concrete in a fixed state for setting.
  • Hardcore – 100mm filled of hardcore then concrete mixture poured on top.
  • Concrete – Enough to create a base that is 100-150mm larger then proposed shed size.

Once you have followed these steps allow time for the concrete to set, using a twig to ensure that is set before further action. A concrete base is the ideal base for all types of sheds

Secondly, let us explore a garden slab base. A slab base is an easier alternative solution to a Concrete base. However, these slabs need to still be placed on a
stable flat surface e.g. concrete.


  • Spade – Digging around 150mm deep into the surface layer.
  • Concrete – Filling around 100mm deep and allowing it to set.
  • Shed slabs – Start from one corner and place slabs tightly.

Dropping the slabs starting from one corner will allow for a tight placement pattern, which is sufficient for a shed to stand on. 

This is what your slab shed base should look like.



base 1 sized for blog

Another form of base is a timber-decking base. Decking is a quick and cheap choice of base perfect for log cabins and sheds. It also allows you to make a lovely verandah base if you make a larger base then shed. Again, the soil layer has to be flat for the decking to maintain a flat build.


  • Spade – Dig a flat surface for a decking to be made.
  • Timber planks – To create the decking, treat them to make them last longer.
  • Weed Proof Membrane – Lay this underneath the decking to stop weeds growing.
base 2 for blog post

Here is a perfect example of a timber-shed base.

A final choice of shed base which is efficient enough for a long lasting shed is our precut wooden shed base found here -  http://www.shedstore.co.uk/shed-accessories/shed-bases/. They are a cheap and fast shed base that is slotted into the ground to enable immediate she erection, no waiting around for concrete to set. Metal ground spikes make sure that the base stays anchored to the soil layer.


Examples of shed bases that are not efficient are -

Grass – Timber sheds will rot on grass bases and you will find that the shed will eventually fall apart and may cause damage or injury to you and your items.

Garden slabs – Simply placing slabs on top of dirt or grass is not efficient, as it will not produce a flat and stable surface for the shed to sit on, creating an uneven distribution of weight on the shed.


Please note – if you have paid for shed insulation, the installation team will not clear your garden for you and may not wait around for you to do so. Always prepare your garden in good time for your delivery

If you require visual instructions on how to create any of the following shed bases, we suggest a rated Youtube video to enable a smooth and easy build.

We are here to advise and answer any questions you may have about Shed bases, do not hesitate to give us a ring on 0333 003 0518. Alternatively drop us an email at customercare@shedstore.co.uk and we will get back to you as soon as we can.

To learn more about building a wooden shed base, check out our instructional video below

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