Log Cabin Wall Thickness Explained

When you shop for a log cabin, the first number you'll see is usually the wall thickness: 19mm, 28mm, 34mm, 44mm or 70mm. It affects how strong the cabin is, how it holds heat, how big it can be and how you can use it. This guide explains what each thickness is good for, so you can compare cabins with confidence.

What does wall thickness mean?

A log cabin is built from solid timber logs that slot into each other, both along their length (tongue and groove) and at the corners (notched joints). The wall thickness is the thickness of those logs, and so the thickness of the wall.

That's different from a shed or summerhouse, where thin boards (cladding) are nailed to a timber frame. Shed cladding is usually 12–20mm thick. Some sheds use "loglap" cladding, which looks like logs from the outside but is still cladding on a frame, not a true log wall.

Wall thickness at a glance

These are general guides that apply across the industry. How a particular cabin performs also depends on its roof, floor, glazing, doors and how well it's built and maintained.

19mm and 28mm: light use and summer rooms

Thinner logs make lighter, more affordable cabins. They're ideal for storage, a children's playhouse or a summerhouse you'll mostly use on warm days. Because the logs are thinner, these cabins are normally kept smaller, as long, thin walls are less rigid. They warm up quickly in the sun but lose heat quickly too.

34mm: the step up

34mm logs are noticeably more solid, and allow larger buildings with more doors and windows. They're a good middle ground for a hobby room or garden room used through spring, summer and autumn.

44mm: the all-rounder for garden rooms

44mm is where many buyers land for a garden room, home office, gym or workshop. The thicker logs give:

• More strength and stability, so the cabin can be larger and carry bigger glazed doors.
• Better warmth than thinner logs, as more timber holds heat for longer.
• Better sound insulation, useful for a music room, gym or video calls.
• A more solid feel, with heavier doors and a sturdier build overall.

All the log cabins we currently sell are built from 44mm interlocking Scandinavian timber by Power Sheds, in apex, pent and chalet styles, including chalet cabins, combi cabins with built-in storage and cabin garages. Many come with double toughened glazing, uPVC or aluminium doors and windows, and an EPDM rubber roof. Every log cabin we sell comes with free kerbside delivery, craned off the lorry on a pallet, as a self-assembly kit. See our Power Sheds buying guide or design your own with the log cabin configurator.

70mm: heavy-duty and premium

70mm logs are the heavyweights. They're used for large cabins and buildings where extra strength and thermal mass are wanted. They are heavier to handle and need a strong, well-prepared base. For most garden rooms, 44mm with good insulation in the floor and roof is a practical alternative.

Does a thicker wall mean a warmer cabin?

Yes, but only up to a point. Timber is a natural insulator and a thicker log holds heat better than a thin one. But even a 70mm solid log wall does not insulate as well as a modern insulated house wall. Heat also escapes through the roof, the floor and the glazing, often more than through the walls.

So if you want to use a cabin comfortably in winter, the biggest improvements usually come from:

• Insulating the roof, as heat rises.
• Insulating the floor, which makes the room feel much warmer underfoot.
• Double glazing and well-fitting doors.
• Heating and ventilation, to keep the room warm and stop condensation.

Choose a thicker log for strength, size and feel. Choose insulation for warmth. Our garden office buyer's guide covers insulation, heating and electrics in more detail.

Log cabins move, whatever the thickness

Solid timber takes in moisture in wet weather and dries out in warm weather, so the logs swell and shrink a little through the year. A well-designed cabin allows for this. A few things to know:

• Don't screw shelves, cupboards or panelling across several logs in a way that stops them moving. Use slotted fixings or fix to one log only.
• Door and window frames are designed with small gaps above them for settling. Don't fill these.
• Treat the timber inside and out soon after assembly, to slow moisture changes. See our timber care guide.
• Build on a firm, level base, as a cabin that isn't square will have sticking doors. See choosing a base.

Does wall thickness affect planning permission?

No. Planning rules are about height, position and use, not wall thickness. The height rules matter most: in England, a building within 2 metres of a boundary must be no more than 2.5m high (Planning Portal). Several of the 44mm cabins we sell are designed to stay under 2.5m. Read our planning permission guide.

Common questions

What thickness log cabin do I need for a home office?

A 44mm log cabin is a popular choice for a home office, as it's strong enough for larger doors and windows and holds warmth well. For comfortable use in winter, add insulation to the floor and roof, plus heating.

Is a 28mm log cabin warm enough for winter?

A 28mm cabin is best suited to spring-to-autumn use. It will lose heat quickly in winter, so it's better for storage, hobbies or summer use unless you insulate and heat it.

Is 44mm better than 34mm?

A 44mm log is thicker, stronger and holds heat better than 34mm, and it allows larger cabins with bigger glazed doors. 34mm is a good choice for a garden room used mainly in the warmer months.

Do log cabins need insulating?

For year-round use, yes. Insulating the roof and floor makes the biggest difference, because a solid log wall alone does not insulate as well as a modern house wall.