Since you don't live in a harsh winter climate, that could work out OK.
Hopefully your run will have a roof for shade and rain protection.
It doesn't really increase square footage, it just provides enrichment(diversion, activity).
7 sq meters or 7m x 7m?
How big is the coop, that matters too.
Oh, and... Welcome to BYC! @Eggos
Where in this world are you located?
Climate, and time of year, is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, and then it's always there!