How to Build a Shed Base with Concrete Blocks | UK Guide | 2023

How to Build a Shed Base with Concrete Blocks
When adding a shed to your garden, it is important you create a stable foundation for the structure. Many outdoor spaces have uneven terrain that makes it difficult to lay a conventional foundation without undertaking a substantial amount of construction work. However, you can overcome the challenge of uneven ground and varying soil types by using concrete blocks to construct a base for sheds.

Why Shed Foundations Are So Important

Ensuring your shed and garden buildings have a secure foundation is important. If your shed is made from wood, it is especially crucial that you had a concrete base to it, preventing the material from becoming exposed to moisture and rotting. It will also prevent soil-borne insects excessive damage to the structure of your shed.

A raised concrete block foundation will also provide allow for better airflow beneath the base of your shed. Raising your shed slightly also ensures you can always enjoy access to your garden building. If your garden has looser soil, heavy rainfall can shift mud around, potentially blocking access to your shed. The same applies in the event of heavy snowfall, with significant snow levels preventing easy access to your shed interiors.

Concrete block foundations also make it easier to ensure your shed is sitting level. Gardens are rarely completely level and if are your looking to add a larger shed to your outdoor area, you will find it a challenge to find enough even square footage to accommodate the structure.

Installing a Concrete Shed Foundation

Before commencing work on your shed foundation project, first measure out the dimensions of your shed. Once you have this taken care of, find a suitable place in your garden to build your foundation. Ideally, you want even ground, but some slight sloping is okay as you can compensate for this with tiered concrete blocks.

You should make sure you have enough concrete blocks to be placed beneath every corner of your shed. If your shed is on the larger side, you will also want additional blocks that can be placed between these corner foundations. You will also need to support the central area of your shed. If you fail to support the middle of your shed, you will quickly notice the floor sagging. Significant sagging can even damage the structural integrity of the shed, causing a collapse. It is also important that you equally space all the blocks you are using to ensure the best support possible for your shed structure.


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