How to Build a Shed Sub-base

Before you start building your garden shed, the most important part is getting the sub-base right. A good sub-base is the key to a long-lasting shed; it provides stability, protects your shed from movement and keeps your shed square and level for years after.

Here is how to build the perfect sub-base, along with the most important dos and don'ts to help you avoid common mistakes.

Why Is a Sub-Base So Important?

Your shed sub-base is the most important part of the build, as it is what everything will sit on. Without a good sub-base, you can end up with issues like:

• Doors dropping and not being able open/shut
• Damp and rot creeping up from the ground
• Shorter lifespan for the shed
• Not sitting square and moving overtime
• Will not assemble properly

The Do's of a Good Shed Sub-base

The Right Location: Make sure to pick a dry, level area with some good drainage. Try not to pick a low spot where water will collect. It is also important to think about convenience and how easy it will be to access throughout the year.

The Right Type of Base: The best sub-base for your garden shed will always be a concrete slab.

Other options are:

• Paving slabs
• Hardwood Sleeper
• Plastic shed base grips with gravel 

Use a Spirit Level: Having a level and an even base is a non-negotiable. Making sure you use a spirit level is crucial. An unlevel base will lead to a wonky, off-square shed.

Correct Ground Prep: The ground prep for a sub-base is just as important as the sub-base itself. Make sure to remove turf and large debris until you get to a solid base. It is also a good idea to put down a weed membrane, which prevents weeds from growing through and keeps it all looking tidy.

The Don’ts of a Solid Shed Base

Don't Skip the Sub-base: Putting your shed directly onto the soil or ground is a big NO this will lead to the shed sinking, rotting and instability. 

Don’t use gravel on its own: Gravel is great for drainage under a shed, but do not use it loose with any borders or grids. It will lead to instability and movement in your shed.

Don’t Forget Drainage: Standing water is your worst enemy; avoid creating any kind of bowl for water to collect. Make sure the drainage is good. 

Don’t Just Eyeball It: Even if the ground looks level to the eye, it can be deceiving. Make sure you measure and use tools to make sure it's level and even.

Don’t Use Wood Straight Onto Soil: Don’t put bearers or the shed floor straight onto the soil, as it will absorb moisture and rot over time.

Things To Remember...

Taking your time to make sure that your sub-base is done properly is one of the most crucial parts of having a long-lasting and sturdy shed. Whatever you decide to use as your sub-base, use these tips for the best results