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Without more details, hard to assess. For sure have the roosts down enough to avoid any drafts from permanent full-time ventilation. I have 24 chooks and did 1 sq ft for every 4 birds, full-time ventilation. I did two soffit vents full length of 18 ft x 1" wide. Also a 16" turbine vent in center of roof, and two 12 x 12 gable vents at peak of each gable. My coop is 8 x 16 x 7 1/2 ft tall. I also have 4 windows that add another 40 sq ft for warm weather ventilation.
Keep roosts 12" from walls and do a 24" wide poop plank the length of the roost. I did mine with OSB and covered with linoleum. I scrape it daily.
This removes excess humidity and ammonia gas from coop to keep lungs of chooks healthy and to reduce chance of frostbite. Roosts can be 2x4 set flat, but 2x2 is fine if not in a real cold area. Mine are 2x2 in Tenn. Mine are at ht of 48" while nests are at ht of 24" on opposite wall.
You could get by with a 4x8 coop for 7 birds. I would make it 6 ft tall so as to avoid having roof decking heat too close to the roost area. Do a nest-box bumpout to max out floor space. Two nests will suffice. Do roof overhang to protect the hinges of the nest lid from rainwater. May want to do enough to protect you too if you gather eggs in the rain. Gutter on that side too. If a shed roof, then full length soffit type ventilation front and back, with hardware cloth mesh to prevent predators from crawling in. If gable, then two 12 x 12 vents at tops of gables will suffice. Two windows good as long as they open. Do put hardware cloth screens in them to prevent them sitting in them and clogging the windowsills with poop. Do not be concerned with perches in front of each window regarding poop. They will not use them much anyway because after dark, they will be on the highest roosts. Do make windows so that they can be opened/closed/locked from outside. Good idea too if can get to poop plank to remove it yearly. Daily scraping with an 8" drywall knife

works for me, as the smears dry quickly and then contribute no further humidity or odors
Can remove once a year to scrub when litter is changed. Litter can last a year if poop planks designed right and cleaned daily. A slide-out sheet metal one would be great too. I put no litter on mine, but I do scrape daily as I said.
My coop is not stinky and that is only because I scrape poop planks daily and throw two windows open in AM for total air changeout. You can walk into my coop any time except at dawn and smell only the litter/grass smell. I use deep litter method and use grass clippings only. Free and smell good too and never any trouble using them. Would use wood chips if could get them free, but I cannot.
Could do a shed roof and have a generous overhang on nest/egg side with a counterweight. Then do hinges on that side too and open the roof like a lid to access inside of coop. Big end doors would allow same type of access with better reach to the floor area. Do linoleum over OSB for floor. Allow 3:1 slope for walkboard. Inside will need no walkboard if poop plank done at around 24" ht and roost at around 48" ht. (Or go with 18" and 36") They will simply hop from one to the other as mine do. My two interior walkboards are never used. Some breeds do not hop up well tho so that is a consideration.
Ask lots of questions, take long breaks, short puffs, work safely, and have fun.