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Earlybird delivery discount: Check out reductions available on this page. Take advantage now.

Earlybird delivery discount: Check out reductions available on this page. Take advantage now.

Four Things to Know About Garden Buildings Floors

To try to help you make the right decision we highlight what you should look out for and what you should avoid and – as importantly WHY. Whilst we all want the cheapest price for our garden shed it’s really important that you ensure you buy a building which will fill all your needs and, very importantly, will stand the test of time. This is why you need to do a little homework beforehand. Yes, I know, we were all not keen on doing ‘homework’ but believe me, this homework is vital to ensure you are happy when your new building is delivered.

1/   What Is The Floor Made From?

The floor is absolutely essential to the durability of a shed or garden workshop so it is essential that it is made from appropriate materials to ensure that it stands the test of time. Avoid cheap grades of chipboard (designed for use inside your home in cheap furniture) and Oriented Strand Board (otherwise known as OSB, wafer-board or Sterling Board) which, as they can delaminate when exposed to damp, are simply not suited for the job.

Look only for proper tongue and groove softwood timber flooring or specialist flooring products such as moisture-resistant particle boards such as Caberboard or Egger Board. Remember, unless it is tongue and groove (T&G) or a high grade man made material such as Caberboard or Egger board then sheet materials (often advertised as ‘solid sheet flooring’ are NOT suitable and should be avoided.

So ‘proper’ timber is the way to go. You will also find those garden shed companies which use chipboard and OSB boards usually call these floors ‘SOLID SHEET FLOORS’ and the reason or this is that they don’t want you to know what you are getting. You will also find quite often that the shed floor is excluded from their guarantee when they use man-made boards. So always ask the question before parting with your cash and don’t be sorry after the event.

2/   How Thick and How Many Floor Joists?

Besides being made from proper timber it’s important to consider the number and thickness of floor joists on any shed. Quite often, certainly on the cheap sheds, the floor joist size is as small as 1-inch x 1 inch (25xm x 25cm). The ideal size and which is the best size to aim for is 2 inches x 2 inches (47mm x 47mm). This will give the shed floor the strength to take its load and to spread the weight throughout. The spacing of the floor joists should be no more than about 14 inches (35cm) apart and again on the cheaper sheds, the gap can be quite large. This will allow the shed floor to buckle and sag as you walk on it with a possibility it may break. It’s even worse with chipboard or OSB as it’s not as naturally strong as ‘proper’ wood.

3/   How Thick is the Garden Building Floor?

The thickness of the floor is also key and you should aim for at least 12mm (finished thickness) and ideally T&G boards. On some of the cheap sheds, the boards are only about 10mm (thick!!) about 3/8ths of an inch. That’s smaller than a standard pencil – crazy!

4/   Is the Garden Buildings Floor Pre-assembled?

Amazingly on some garden sheds, and many of the cheap sheds, you have to build the floor your self. They just send along the OSB (sheet materials) and the floor joists for you to nail together. They don’t even supply the hammer.

Frequently Asked Questions (FAQ) Choosing The Right Floor For Your Garden Building

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  • Can You Use Paving Slabs For Shed Base?

    Paving slabs can be a suitable option for creating a shed base. They provide a stable and durable foundation for your shed, helping to protect it from moisture and uneven ground. When using paving slabs for a shed base, ensure the ground is levelled correctly and compacted before installation. Consider using a weed control membrane to prevent unwanted growth underneath the shed. Paving slabs can be cost-effective and practical for your shed base construction.
  • Do You Need Planning Permission For A Concrete Shed Base?

    Planning permission is not generally needed for a concrete shed base. However, it is advisable to check with local authorities to ensure compliance with regulations. The size and location of the shed base may affect whether permission is needed. Planning permission is optional if the base is considered a temporary structure and meets specific criteria. It is essential to confirm this information before commencing any construction to avoid potential issues in the future.
  • Should A Shed Have A Concrete Floor?

    A shed should have a concrete floor for stability and durability. Concrete floors provide a solid foundation for the shed structure, ensuring it remains level and secure. Additionally, concrete floors are resistant to moisture and pests, keeping the shed's interior dry and protected. Opting for a concrete floor in a shed is a practical and long-lasting choice for optimal functionality and longevity. A very practical option is a timber subframe base.
  • What Is The Best Base To Put Under A Shed?

    The best base to put under a shed is a sturdy foundation made of either concrete or a timber subframe. Concrete provides a permanent and durable base that can withstand heavy loads and prevents moisture from seeping into the shed. On the other hand, a timber subframe allows for better drainage and is easier to install than concrete. Whichever option you choose, a solid base is crucial for ensuring the longevity and stability of your shed. 1st Choice has a full range of bases available.

About Author:

Robin Antill is an established authority in the field of quality garden building manufacturing, boasting over four decades of experience. Having founded Titan Garden Buildings in 1979, he demonstrated a commitment to excellence from the outset by moving away from subpar materials and embarking on crafting buildings of superior quality.


His lineage of craftsmanship, traced back to his father and grandfather's business in Cleethorpes, underscores his dedication to quality and customer satisfaction. Robin's son, Craig, who joined the business in 1990, brings additional expertise, having honed his skills at Guildford College in joinery.


Together, they elevated Titan Garden Buildings, which eventually evolved into 1st Choice Leisure Buildings. Their enduring focus on premium materials, top-notch manufacturing, and unparalleled customer service, along with Craig's digital acumen in creating the company's online presence, showcase their expertise and reliability in the industry.


Robin’s expertise was featured in Realtor.com, Homes&Gardens, The London Economic, and dozens other publications.


Woking Show Site
1st Choice Leisure Buildings
Woking Garden Buildings Show Site
Sutton Green Garden Centre,
Whitmoor Ln, Sutton Green,
Guildford,
GU4 7QA
Phone 01483 237550