I built my plane in a workshop equal to a single car garage. 12 feet by 18 feet.
I primed the fuselage and moved it outside. Wings were assembled and skinned in the covered area under the deck, outside the shop.
I tried to work on the project everyday.
I bought a cheap awning to block the sun.
I used plastic tarps from HF.
Weather cooperated by having temperatures good enough to cure epoxy and dry paint.
I post-cured with black plastic and sunlight.
I painted outside, not one bug was invited nor showed up.
When it rained, I bailed out water and wiped metal parts.
Back in my RV-6 building days, I was a bachelor. It made a lot of things simpler.
The completed wings lived along a wall in my master bedroom for a couple of years, the dining room was home for the canopy for a year or so, and one of the off-bedrooms housed tailfeathers. Chicks dug the shiny wings in the bedroom. ;-)
These days? The RV-10 fuselage is in the garage. The wings are in the basement. The empennage is in the hangar at the airport. Those are all SWMBO approved locations unless the fuselage is in the way of parking her car. The avionics in the formal dining room? She doesn't care (we don't use the room), but she pretends like she does.
Had a huge house. Built one from scratch so I would have a giant heated shop. Then I outgrew that shop and rented space in an 11k sq foot hangar. Still have the giant shop at the house. I have rationalized this to myself by telling myself that I didn't want my business at my house anymore and had to move the CNC machines and all the airplane/composite stuff out. <John Lovitts voice> Yeah, that's the ticket.....
I would say I probably need to talk to someone in the psychological arts at this point.