Concrete Shed Base Cost

Want to know how much a concrete shed base costs in the UK?

In this guide, we cover everything you need to know about getting a concrete shed base constructed. This includes typical concrete base prices you're quoted in 2025, building regulations you need to know about, and much more!

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How Much Does a Concrete Shed Base Cost?

Getting the foundation right is a critical element of installing a new shed in your garden.

If this isn't done right, then your shed installation might develop a number of issues. This could include water damage and rot, as well as subsidence if the base can't support the weight of the shed.

The bottom line is this:

If you want to keep your shed for a long time, then you must get the foundation right. And the most popular option used by UK homeowners who want the most durable and long-lasting is a concrete shed base.

Despite their simplicity of design, concrete bases come out ahead of the competition in many ways.

We'll get to this later in this guide. First, let's deal with what you should expect the cost of a concrete shed base to be in 2025.

How much a concrete base for a shed costs depends on the type of concrete you're looking to use and how deep the concrete shed base needs to be.

Poured concrete usually costs between £75 and £95 per m³. For a small shed, the concrete alone will cost around £40.

Concrete pouring costs around £90 to £100 per m³ for grades C8/C10/C15. Expect to spend around £100 - £110 per m³ for grades C20/C25.

The average price for C30/C35 grades is £110 to £120 per m³. If you need grades C40/C45 concrete, the average cost of pouring concrete is about £130 to £140 per m³.

Pouring concrete is also typically priced per cubic metre (m³) because you need to fill a volume (i.e., length by width by depth) rather than an area (i.e., length by width).

Unsure how much concrete you'll need for your shed's foundations?

The best thing you can do is consult with a builder near you who understands what's required to correctly lay a concrete base for a shed.

There's no cost, no obligation, and no hassle when getting quotes from tradespeople near you via MyJobQuote.

Concrete Shed Base Prices

The following are estimated prices, which may vary depending on the size required for your concrete shed base. These include labour and materials, although total cost may be higher in areas such as London and the South East.

Several factors may influence the final cost of constructing a concrete shed foundation.

For example: If you plan to have orders and pour concrete, easy site access is critical. Your quote will also be higher for installing a concrete slab if you transfer the concrete with a wheelbarrow.

If you use concrete slabs, you can normally get them for free or low cost. The tradesperson who arrives to place your concrete slab may include turf or soil removal in their quote.

If they do not, inquire with your neighbours, co-workers, family, and friends. Also, check with the local recycling facility or tip before hiring someone to remove the turf as well as the soil.

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What Is the Cost of Concrete Base Materials?

A shed base necessitates only four substances: type 1 MOT, sand, cement, and some wood, though edging boards or other simple and inexpensive materials will suffice.

We'll only go over supply costs for a concrete shed base in this section, so you know what you're in for if you decide you want to do this job yourself.

Most people buy edging boards from Wickes since they appear to be the best deal, with a pack of 5'8 foot cutting boards costing between £25 and £30. When all the sides of a 6 x 8-foot shed are added together, the total length is 28 feet.

You must spend no more than £45 on wood when building the wooden board for your concrete shed base.

It is strongly recommended that you use type 1 MOT since it compacts the ground once it has been tampered with, decreasing the possibility of the ground shifting or breaking your concrete slab in the future.

You should use 2 inches (50mm) of type 1 thread. One bulk bag of type 1 MOT must cover eight sqm at a depth of 50mm, suggesting that one bulk bag would be sufficient and that smaller bags might be worth considering. Although more expensive than purchasing in bulk, this method will save you time and money when discharging any leftover hardcore.

You can pay £50 per bag. Remember to not have type 1 MOT at the border edges because once the concrete is set and the boards are removed. When building a concrete shed base, ballast is the right type of sand to use. The most budget-friendly way is to buy this sand is in bulk bags.

A bulk bag of ballast usually covers a large area. The best depth for a concrete foundation is 75 – 100mm, which means one bulk bag of ballast should suffice. It is recommended that 4 - 5 bags of cement be bought for each bulk bag purchased. A ballast bag should not exceed £50, and a bag of cement must not exceed £5.00 to £25 (for five bags of cement). Therefore, the overall cost of the cement and sand is £75.

How Much Does Shed Base Installation Cost?

So, how much is it to lay a concrete base in the UK?

Concrete bases can be challenging to install. Concrete is the more labour-intensive of the two options, and if installed inaccurately, it can be expensive and physically demanding to remove.

The labour costs for attempting to install a concrete shed foundation range from £40 to £50 per m². This varies based on the complexity of the job and the time required to pour the concrete. For labour, you should budget around £220 and £450 per day.

Make your choice determined by the type or size of shed you wish to build. Your decision is influenced by what you aim to store in it, the demands of the location, and your budget. A small shed's requirements differ from those of a large shed. The open bottom or constructed floor, and the sloped or flat ground, influence your decision.

Based on the installer's knowledge and prep workload before laying the material, concrete bases could take somewhere between 24 to 36 hours to lay and begin to set.

Most concrete bases necessitate the addition of a border to prevent the concrete from spilling out, which is done after the ground is prepared and before the concrete is laid. It takes roughly seven days for the concrete to heal and be ready for a shed or garden building after levelling the base.

Most installers advise using support structures throughout your concrete base, which increases the amount of work. PSB does not necessitate the use of any support structures. Concrete is a labour-intensive material that, if installed by hand, can take several hours to lay and level correctly. If done incorrectly, it can be costly and permanent to replace.

PSB can sit on top of a sub-base and protrude without requiring a border and still work well. Concrete needs a solid border to prevent it from spilling out of its place. PSB can bulge and sit on top of a sub-base without a border, but it still works well.

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Factors That Impact Concrete Shed Base Costs

There are many reasons why the price of installing a concrete shed base varies. In this section, we go over the different cost factors and how they affect the overall cost.

Location

Because tradespeople's prices vary across the country, the cost of installing a concrete shed base will vary depending on where you live.

Hiring costs in the southeast, on the other hand, are typically greater than the average, particularly in London. However, costs are generally lower in northern England, Scotland, or Northern Ireland than in the rest of the nation.

Amount of Tradespeople

The cost of erecting a concrete shed base is also determined by the number of tradespeople required, influenced by the size and type of concrete base required. The greater the number of tradespeople required, the more costly the installation.

Size

It should be no surprise that the larger the shed base, the more expensive the repair. A bigger shed base will have greater labour or supply costs than a smaller one.

Duration

The higher the labour cost, the longer it takes to install the concrete shed base. However, the longer the hiring time frame, the more you will pay, with some property owners having to employ repairers for a few days while others must hire them for several weeks or months.

Materials

Most people envision a garden shed as a wooden structure with a bitumen felt-covered roof. However, an old, corrugated iron or concrete shed will frequently suffice.

Except for permanent outbuildings, these are rarely used these days. Garden sheds made of aluminium or plastic, on the other hand, have recently grown in popularity.

Although wooden sheds are wonderful, a metal shed is far more secure and comes in various colours thanks to hot-dipped plastic coatings. On the other hand, a metal shed is often more expensive than a wooden shed but requires less maintenance over time.

Doors

Depending on the purpose and style of your shed, you can choose between single or double doors. Some people use big sheds instead of garages, which require double doors. Because of the extra work involved in manufacturing, sheds with two doors are much more expensive than those with one.

Windows

If the shed is only used for storage, the window is unnecessary and reduces the shed's security and privacy. However, if it is a workshop or office, natural light from a window is required.

However, for the summer months, purchase one with opening windows and secure window fastenings.

Additional Costs of Concrete Base for a Shed

You could decide to have additional work done when installing a concrete shed base to give your garden a fresh look, from a new patio design to landscaping costs for your entire garden. However, the most likely additional cost will be that of a new shed.

New Garden Shed Cost

Garden sheds are specifically designed to help you store and organise your gardening needs.

Without a garden shed, you'll be required to leave garden tools and materials out in the open throughout the garden, making them difficult to find, vulnerable to water damage, and easily stolen by burglars!

Instead, everything can be kept neat and dry in a garden shed, right where you need it. Installing them typically costs between £500 and £1,000.

Outdoor Lighting Cost

Once your new shed is built, you may need to supply it with electricity and add lighting. The average cost of installing outdoor lighting is around £200, but this can vary depending on your specific requirements.

For example, standalone lighting is usually much cheaper than wiring the shed to your home’s electrical system.

What's Involved in Installing a Concrete Shed Base?

A great shed is also a beautiful natural wood addition to your outdoor area. It is worth the effort to build a shed that's both attractive and sturdy, as well as functional — and that has to begin with the foundations.

Without a firm and level foundation, your new outbuilding may appear new, but it will quickly become unusable.

You can rent all the tools and equipment you'll need to lay a concrete foundation for your shed, and we'll walk you through the process so you can decide whether to do it yourself! So if you’re wondering how to build a concrete shed base, read on…

• Step 1: Begin by marking out the region for the slab once you've decided on a location. Make it bigger than the shed and leave enough room for the wooden frame that will be placed around the area's perimeter, keeping the concrete in position.
• Step 2: Push a wooden peg into the surface at each corner and connect them with a taut length of string. Measure both diagonals to ensure the corners are square and adjust if needed.
• Step 3: Excavate a level-bottomed pit 100mm deep for the sub-base and damp-proof membrane. Remove all grass, vegetation, stones, and debris before compacting the earth. A micro excavator can speed up this process.
• Step 4: Install a hardcore sub-base using MOT Type 1 hardcore, then compact it thoroughly with a vibratory plate. Spread a sand layer on top to protect the damp-proof membrane from the stones.
• Step 5: Build a frame using 150mm x 25mm treated timber to the size of the slab. Ensure the frame is square and level, placing it in position. Drive wooden posts at one-metre intervals around it to prevent bowing and ensure the frame is level on all sides with the use of a spirit level.
• Step 6: Cover the sub-base with heavy-duty plastic sheeting, turning the edges up to create a tray. Overlap and tape any joints. The damp-proof membrane prevents the concrete from drying out too quickly and reduces condensation inside the shed.
• Step 7: Calculate the volume of concrete needed by multiplying the slab's length, breadth, and depth. Order your concrete and hire a mixer. A typical mix ratio is one part cement to five parts aggregate and sand. Consult your supplier if unsure about quantities.
• Step 8: Cement is corrosive so ensure to take correct safety measures. Concrete starts to degrade around two hours after mixing, so work efficiently with two people. Spread it evenly in place with a shovel or rake, leveling out with a straight-edged board. Tap to remove any air bubbles, before covering with raised polythene to prevent cracking.
• Step 9: Allow at least 48 hours for the concrete slab to dry enough to step on. Remove the formwork once the concrete is dry. The slab will cure fully in 28 days but will be ready to bear weight before then.

Types of Concrete Shed Base

Concrete slabs are among the safest and most secure garden building foundations that can be made or purchased. Concrete slabs can be built to precise dimensions and serve as a highly stable, weather-resistant foundation for any timber, plastic, or metal structure.

In this section, we will discuss the various types of concrete shed bases and their advantages and disadvantages.

Pavers Made of Concrete

A beginner's shed foundation is appropriate for pre-built or home-built sheds. Paver foundations are constructed on levelled exposed ground or sand. They provide a solid flat foundation for constructing or constructing a shed and evenly support the floor.

The bigger the paper, the tougher it is, but it requires fewer pavers. Pavers work well on level ground for smaller sheds with or without a floor made of wood, metal, or plastic. Because pavers are used, the entrance is close to or on the ground.

Once the ground has been levelled, pavers are simple to install. However, if the pavers are to be laid on sand, they must first be levelled. This is because sand also assists in levelling the pavers.

They cost £100 and £200. Pavers are priced according to their size, colour, and shape. Large steel mesh pavers are available, and they're more expensive.

Pros

• ✔ Available in a variety of colours and sizes
• ✔ Quick and simple to install

Cons

• ✖ Can settle into the soil over time
• ✖ It can crack when subjected to heavy loads

Blocks of Solid Concrete

A good foundation for any size shed, ideal for prefabricated or custom-built sheds. Concrete blocks can be rectangular or square.

Only use solid concrete blocks. They must be level with one another and sit on the ground. The number of blocks needed is determined by the shed's dimensions and the ground slope.

You are only levelling the base blocks and not the ground itself. Levelling the blocks and squaring the corners are the most difficult steps. When the terrain is slanted, the difficulty level rises. It is usually in the region of £100.

The size and shape of solid-concrete blocks determine their price. The amount required will be affected by the size of the shed and the slope of the ground. The height of the shed from the ground is another factor to consider.

Pros

• ✔ Good for small sheds
• ✔ Easy to stack

Cons

• ✖ It has the potential to sink over time
• ✖ Unsuitable for steeper slopes

Timber Frame and Gravel Pad

A simple foundation is suitable for ready-made and home-built sheds of any size. This is more challenging for the inexperienced DIYer due to the size. The gravel pad and timber frame foundation are ideal for flat ground. The most difficult steps in this foundation are aligning the 4"x4"s and squaring the corners. This ranged in price from £200 to £400.

Pros

• ✔ Easy to level

Cons

• ✖ High rot risk

Slabs of Concrete

A wonderful foundation for any size shed garage, or even a two-story house, whether ready-made or custom-built. The various steps make this harder for the inexperienced DIYer to complete, and it's a more difficult foundation to construct.

The amount of space required is determined by the size of the shed. The finished slab can support cars and sits on the surface, making it simple to enter.

This costs around £2,500 and £4,000 for a 300 square foot pad. The total cost of all materials will vary depending on the area. Rentals/hires of equipment and Building Code requirements also increase the cost.

Pros

• ✔ It is permanent and can withstand heavy loads

Cons

• ✖ Pouring requires temperatures above freezing, and it can crack over time

Can I Install a Concrete Shed Base Myself?

If you're constructing a shed or another structure in your garden, including a greenhouse, summer house, or even an office, you'll need to provide it with a sturdy and strong concrete foundation that will support the framework, provide a level base, and protect it from rot caused by groundwater seepage.

If you're used to doing your own DIY projects, you can simply build your own concrete shed base in a day or two. However, you must understand what could go wrong to avoid these minor errors. Here, we will go over what you need to have and be aware of.

It's critical to double-check your preferred shed location in relation to your property lines. In addition, most towns and villages have a particular criterion for building setbacks, which you should check before beginning construction.

A flooded shed is exactly what you don't want! If you choose, you should avoid putting your shed in any swampy or low-lying regions of your property. Instead, find a high, well-drained location and prepare the ground for your shed there.

One of the simplest ways to cause problems with your shed is to simply place it in the garden without first ensuring that your chosen location is level!

If the project appears to be a little larger than you want to take on, you can always hire a professional planned construction contractor to do the ground preparatory work for your shed.

Building Regulations & Planning Permission for Installing a Concrete Shed Base

When it comes to purchasing a garden shed, summerhouse, or other garden building, it is all too easy to believe that looking at glossy brochures, flashy websites, or, ideally and highly recommended, visiting a garden shed showroom is all there is to it, apart from paying for it, of course. You'll also need a sturdy foundation for your shed if you want it to last if possible.

However, you must consider whether planning permits are required. Regulations and guidelines have evolved over time to reflect changing needs. Consider any available advice and, if in doubt, contact your local council.

The key criteria are that your garden shed is at least 2m away from the boundary IF it is taller than 2.5m. Most sheds are under 2.5m in hight, but some are not.

Planning permission is usually required if the property is a flat, maisonette, or used for a business.

You will also discover that in the event any gutterring or foundations extend onto a neighbour’s property, this is considered a legal boundary issue rather than related to planning permission. As such, always check your property lines and ask for written consent from your neighbour if required.

If you intend to use your shed base to build a living area, you will need both planning permission and building regulations approval. Usage as a business is sometimes permitted, although check with the local planning officer just to be sure.

The proposed garden shed, summerhouse or outbuilding may not be built ahead of any wall constituting the front of the original building, and it may not be more than one storey high or higher than four metres with an apex roof or three metres with a pent roof.

It cannot take up more than half of your garden, cannot have a raised decking of more than 30cm, and cannot have a veranda or balcony. In most cases, planning permission may be required, so check with the local planning officer.

Planning permission may also be required for your new garden shed if your property is a listed building, in a conservation area, or in a protected area such as an Area of Outstanding Natural Beauty (AONB). Again, your local planning officer will guide you in these cases.

It is possible that a garden shed, summerhouse or other garden building was erected without permission, in which case the planning officer may necessitate retrospective planning permission.

In the event you need to inquire about a planning application for a new shed, the planning officer may grant you a letter of entitlement to give you peace of mind.

Checklist: Hiring Contractors for Installing a Concrete Shed Base

Request Recommendations

Your friends and neighbours may know someone who has recently finished a project in their home. They may also be able to advise you on who to avoid, which can be equally beneficial.

If you need someone to perform a conversion or extension, make sure they have many experiences. If you own a period asset or live in a Nature Preserve, you want to know that the tradesperson you hire has experience with similar properties and areas.

Request that References be Provided

You should not be afraid to request references from any tradesperson you are considering hiring. If they refuse, you might be best off choosing somebody else.

Look for Them on the Internet

A quick Google can reveal a lot of information. If they have a business Facebook page, see what comments and reviews they've received.

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