How thick walls for a holiday home

[Johansson]

Hi,
We are planning to build a small vacation house of 30 square meters. My question is, how thick should the exterior walls be? We will not be there during winter, only from April to September.
I want them as thin as possible because we are only allowed to build 30 square meters, and I don't want to allocate too much of this space to walls.

 

[Patrik_N]

A relevant question I think is: can it go below zero indoors during winter? That would surely affect wall thickness a lot.

 

[KnockOnWood]

I would probably, without further calculations, choose 145 mm.
Maybe 95 mm standing and 45 mm lying studs to minimize thermal bridges.

Addition:
If the cabin is hypothetically 5 x 6 meters, the outer walls are 22 meters.
100 mm thickness on the walls takes up 2.2 sqm, 150 mm takes 3.3 sqm.
One square meter here or there probably doesn't mean much.

Otherwise, it's theoretically possible to build with 70 mm studs as well.

If and when the cabin will be used all year round is written in the stars

 

[Workingclasshero]

What will you use for the frame?
45x95 plus 45x45 sounds excellent.
OSB+plasterboard on the inside.

My late mother built 12 sqm in '62, and she said, "If I had known we would be here so much, we would have built bigger."
Build with high quality, you won't regret it.

 

[Johansson]

Thank you for your responses!
Yes, it's probably leaning towards 145 mm.
We would actually like to build bigger, but unfortunately 30 is the max in the area where we have the cabin.

 

[MaZtoR]

Is a building permit required to add more external insulation in the future? You can always put up a facade that can be removed and add more insulation after the construction is finished and approved.

 

[sukke2k]

Set up a log cabin and you'll probably get away with the least wall thickness.