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It’s not just the space in your garden you need to consider when looking at log cabin sizes. Thinking about how you see yourself using it helps, too. In this guide, we’ll take a look at each size range and what they allow you to do.
But first, the legal stuff:
What Is the Largest Log Cabin Without Planning Permission?
In terms of ground space, your log cabin cannot leave more than 50% of your original garden taken up by buildings without planning permission (so consider any other extensions and buildings). It also can’t be built further forward than the front of the original house.
Most garden log cabins on the market (including all of ours) are under the legal height limits for outdoor structures.
There are quite a few other rules that might apply to you, and they depend on how you plan to use the cabin, so check out our guide to log cabin planning permission to make sure you’re covered.
Log Cabin Sizes
8×6 ft – 8×8 ft Log Cabins
Best for: A compact workspace, small studio, or private retreat.
These are the smallest sizes available in our log cabin range, ideal for use as a garden room. Inside, there’s enough space for a few furniture pieces, like a small desk and chair set or a corner couch to lie back.
It’s not the best pick for mixing multiple uses, though, since you won’t get much room to move around. Still, these log cabin sizes are a good place to start if you’re short on outdoor space but want a functional room.
You might want to have a look at the BillyOh Outpost if that’s right up your street. It’s insulated for year-round use, with a double-glazed door that sits at the centre. There’s also a tall opening window on the side for ventilation and flooding the room with natural light. It all comes together well for the uses mentioned above.
Sizes in metres: 2.5m x 2.0m / 2.5m x 2.5m
10×8 ft – 10×10 ft
Best suited: A home office, casual hangout space, or a log cabin shed.
Either of these sizes gives you a middle ground, with more breathing room than the first two. While it’s not a huge ‘upgrade’, you can tell the difference once you’re inside.
For one, a log cabin shed layout that allows you to utilise the structure for storage and a workshop. Being able to divide zones within the same space says quite a lot about what these sizes can offer, wouldn’t you say? This is exactly what you’ll find with our BillyOh Clubman—a heavy-duty shed log cabin.
Overall, both are more than enough for solo use or two people working side by side.
Sizes in metres: 3.0m x 2.5m / 3.0m x 3.0m
12×8 ft – 12×10 ft
Best for: A garden pub, man cave, ‘she shed’, or personal gym
This is where it starts to feel more like an extra room. You’re no longer limited to choosing just one use with these log cabin sizes. Better, you’ve got enough room to use the cabin for two uses out of one space.
One great idea is to set it up as a bar that can double as a man cave. Add an L-shaped counter, like the BillyOh Nightjar, at one end (this won’t take up much space). Pair it with a couple of stools, maybe a fridge, and wall shelves or cabinets for storage. You’ll likely have space for a comfy chair or a recliner and a small TV for game day. Bean bags are also nice if you often invite friends over.
At 12×8 or 12×10, a garden gym wouldn’t be a bad idea either. No trouble fitting in a treadmill, bench, or exercise bike, and you can still squeeze in for some storage.
Give these garden room ideas a read; they could give you a better picture of what’s possible!
Sizes in metres: 3.5m x 2.5m / 3.5m x 3.0m
14×8 ft – 14×10 ft
Best for: An outdoor living space extension, a guest room, or a side business.
In a log cabin of this size, the layout becomes less of a puzzle and more about preference. Most importantly, it makes more sense for setups where you’re not using the space alone.
This could be your dream outdoor living space—a more sheltered retreat versus an open patio. Perhaps a guest room that you can furnish with space-saving furniture like a sofa bed and a mini wardrobe.
Running a side business from home? A beauty service is possible, with space for a treatment chair, storage, and even a small waiting spot. Or turn it into a private log cabin salon that works by appointment, so it doesn’t feel overcrowded.
The same applies to other setups. A barber’s corner, a tattoo space, or a packaging room if you sell products online, to name a few!
Need more info? This should help: How to Start a Business from a Garden Building
Sizes in metres: 4.0m x 2.5m / 4.0m x 3.0m
16x10ft – 16x14ft
Best for: Any of the mentioned uses, just in a full room.
This is the point where it’s less about what you can fit in and more about how you want to use it day to day. In essence, you have flexibility overall. Whatever you have in mind, full-sized furniture will fit alongside others.
Think partition walls or even plumbing and electrical fittings if you’re going all-in. The BillyOh Kent, although meant for office purposes, already comes equipped with dividers. It’s so versatile that it can be used for relaxation and entertainment with family and friends.
The smaller section would make a lovely kitchenette, for instance. Then the larger one could house a fitted-out dining room. The possibilities are endless, and you have more options to make the space work for you!
Refer to these log cabin interior ideas for more inspiration.
Sizes in metres: 5.0m x 3.0m x 5.0m x 4.0m
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