That's not cold for chickens at all. With their down coat they will be quite comfortable in those temperatures. And they should be able to spend practically all day every day outside. That helps take the pressure off of you coop size some. As long as a cold wind is not blowing mine go outside when the temperature is -20 C.
If you build a walk-in coop the lowest thing you could bump your head into should be at least 2 meters. I don't know how tall you are but I bounce up and down some when I walk. You want a slope on your roof so rainwater runs off.
I don't now the standard building materials size for Europe. Over here most building materials come in standard sizes of 4 ft and 8 ft or roughly 1.3 meters and 2.6 meters. If you use those dimensions in your design you can usually save a lot of cutting and waste.
It's hard for me to talk coop or run size without knowing a lot about your flock and how you manage them. If you have a flock that is all mature hens they don't need as much room as a flock with various young and old chickens in it. Integrating takes more room than when they are already integrated. If your chickens have access to adequate room outside whenever they are awake they need less coop space than if you or the weather keep then locked in the coop only. Someone in Northern Colorado might need a larger coop than you or I would because we don't have a lot of snow and really cold strong winds that keep them in the coop. But that means we need to manage our chickens so they have access to that outside room when they are awake. There are just too many variables for me to give a suggestion. If you wish you can follow the link in my signature below to see some of my thoughts about chickens and space.
If your climate is as good as I think it is and your chickens can have access to the outside practically all the time when they are awake you would probably be OK with a 2.6 m x 2.6 m coop. You can keep the small coop you have to help with integration or as a place to house an injured chicken. Extra facilities like that can be really helpful. Personally I'd build something like 2.6 x 3.9 meters, that extra room reduces my stress levels when I need to handle a problem. But I'm also raising young chicks a lot. My goals and management practices are different to yours.
If you build a walk-in coop the lowest thing you could bump your head into should be at least 2 meters. I don't know how tall you are but I bounce up and down some when I walk. You want a slope on your roof so rainwater runs off.
I don't now the standard building materials size for Europe. Over here most building materials come in standard sizes of 4 ft and 8 ft or roughly 1.3 meters and 2.6 meters. If you use those dimensions in your design you can usually save a lot of cutting and waste.
It's hard for me to talk coop or run size without knowing a lot about your flock and how you manage them. If you have a flock that is all mature hens they don't need as much room as a flock with various young and old chickens in it. Integrating takes more room than when they are already integrated. If your chickens have access to adequate room outside whenever they are awake they need less coop space than if you or the weather keep then locked in the coop only. Someone in Northern Colorado might need a larger coop than you or I would because we don't have a lot of snow and really cold strong winds that keep them in the coop. But that means we need to manage our chickens so they have access to that outside room when they are awake. There are just too many variables for me to give a suggestion. If you wish you can follow the link in my signature below to see some of my thoughts about chickens and space.
If your climate is as good as I think it is and your chickens can have access to the outside practically all the time when they are awake you would probably be OK with a 2.6 m x 2.6 m coop. You can keep the small coop you have to help with integration or as a place to house an injured chicken. Extra facilities like that can be really helpful. Personally I'd build something like 2.6 x 3.9 meters, that extra room reduces my stress levels when I need to handle a problem. But I'm also raising young chicks a lot. My goals and management practices are different to yours.
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