Is it Cheaper to Buy a Shed or Build Your Own?

A question I’d been thinking about since the purchase of my new house. Was it going to be cheaper to build my own shed with the help of a takeoff services or to buy a flat pack one? I wanted to explore these options, as I not only wanted a shed for garden tool storage, but I also wanted a space to focus on my hobbies. I needed a workshop. Something a reasonable size that could be used for multiple purposes, like an outdoor gym building or office.

You might be asking yourself whether you have the right skills to be able to build your own shed. The answer is simple, really. If you can put together a flat-pack shed, then yes, you can. You’ll need a small selection of basic tools to make the job easier, but it’s very much the same principle.

In this post, I’m going to show you the difference in cost between the two sheds I have constructed. (I say shed, but really, they are both small workshops.) Both are exactly the same size, but they differ in the construction of the base. One is made from a solid patio-style slab base, while the other is made from a budget plinth-style wooden base. It will be up to you which style base to choose, but they both pretty much deliver the same outcome.

Both of my sheds measure 10ft x 12ft (or 3m x 3.6m). Both have a dual apex roof and are covered with the same green shed felt. Here’s an image comparison of the two.

The Shed Base

This will be an important part of the build. It’s going to add the foundations for you to sit upon and will also protect your shed from rot, which is the killer of most outdoor wooden buildings. You can’t build a shed without a base. Alongside a strong base, choosing the right exterior access doors is essential to keep your shed’s interior safe and dry. These doors help prevent moisture, pests, and drafts from entering, ensuring your tools and equipment remain protected throughout the seasons.

In my first build, the flat-pack shed, I decided to go for a solid base made from low-cost patio slabs. It involved clearing and levelling the ground, installing a 50mm hardcore sub-base using crushed aggregate, and laying patio slabs with a cement fixing. In total, the base cost me about £280.

For my custom-built workshop, I decided to save a bit of money and build a timber frame base that rests on individual reclaimed patio slabs. By doing this, I saved about £200. It was still time-consuming to clear and level the ground, but equally as effective. In some ways, I prefer this method as it provides good runoff for water, whereas the solid flat base doesn’t.

For either of these bases, you’ll need some tools, including a cement mixer. You could rent a cement mixer for about £25 per day, but I decided to buy one and sell it after. It worked out cheaper this way. Here’s what you’ll need:

You don’t however have to go with either of these style bases. You could also try one of the following:

Eco plastic grids – These work well on already levelled areas, are super easy to install and reasonably priced at about £140 for a 12ft x 10ft.
Ecobase Fastfit System Shed Base – from WIckes

Cost comparison (Updated Jan 2025)

Here is the total cost for a flat pack shed

Material	Retailer	Cost each	Quantity	Total cost
BillyOh Expert Tongue and Groove Apex Workshop with Dual Entrance – 12 x 10ft (19mm flooring option)	Garden Buildings Direct	£1977	1	£1977.00
Marshalls Richmond Smooth Natural Paving Slab 450 X 450 X 32mm	Wickes	£3.55	72	£255.60
Sharp Sand – Jumbo Bag	Wickes	£42	1	£42
Granular Sub Base Mot 1 Jumbo Bag	WIckes	£42	1	£42
Blue Circle General Purpose Cement – 25kg	Wickes	£4.15	4	£16.60
				£2333.20

Now lets take a look at the costs for the custom made shed

Material	Retailer	Cost each	Quantity	Total cost
Treated Kiln Dried C16 Timber – 45 X 70 X 3600mm	Wickes	£9	8	£72
Treated Kiln Dried C16 Timber – 45 X 70 X 3000mm	Wickes	£7	6	£42
Treated Kiln Dried C16 Timber – 45 X 70 X 2400mm	Wickes	£6	60	£360
Loglap cladding – 121mm x 21mm – ~250m	Ebay seller	Priced individually	240m	£700
General Purpose OSB 3 Board – 18mm X 1220mm X 2440mm	Wickes	£22	5	£110
General Purpose OSB 3 Board – 11mm X 1220mm X 2440mm	Wickes	£22	5	£110
Timber Fence Post 100x100mmx2.4m	Wickes	£18.50	4	£74
Green Ultra Durable Super Shed Felt Roll – 1 X 10m	Wickes	£28	2	£56
Easy Trim Master Integrated Breathable Membrane 112gSM 50 X 1m	Amazon	£57	1	£57
Butt Hinge – Chrome Brass 76mm Pack Of 3	Wickes	£4.50	2	£9
Single Thread Grab Pack Zinc & Yellow Screw – Pack Of 1000	Wickes	£13	1	£13
Window (optional)	Facebook Marketplace	£40	1	£40
Blue Circle General Purpose Cement – 25kg	Wickes	£4.15	1	£4.15
Sharp Sand – Major Bag	Wickes	£2	2	£2
			TOTAL	£1609.15

So there we have it, build your own shed and you’ll come in a little cheaper than a flat pack. And the best thing is your shed will be much stronger and durable than a flat pack shed.

Flat-pack shed total cost – £2333.20

DIY custom-built shed – £1609.15

It all depends on what materials you use. The above is just a guideline, really. You can save more money by going for cheaper cladding, for example. This shiplap cladding is also great and costs a lot less than the loglap. You’ll save about £100.

You can read my step-by-step guide of how to build a shed here .

Where to buy flat pack sheds, workshops and log cabins

There are many retailers out there who offer a great range of sheds or workshops. They are all very similar in style and construction, unless you decide to go for something a little longer lasting. Here is a list of trusted sites that I have used in the past:

If you’re after something a little nicer than a standard shed or workshop, then why not consider a garden office. Turn your outdoor space into another flexible workspace for that all-important quiet space away from the house.

Read how I changed my workshop into a garden office with insulation and UPVc doors here

Save more money!

Save more money by using a cashback site like Topcashback. I’ve been using this for all my projects and generated over £1100 in the past few years on items I’d be buying anyway. Here’s a snapshot of my current earnings: