In our design we decided every room must have dual functions. We'd use the sun to offset our need for full use of the power grid; we'd manage our site water efficiently; we'd build small; we'd make use of recycled materials whenever possible; we're be careful with the land and repair construction damage with native plants or food crops; and we'd create wildlife habitat. In that equation, people ask, "so, why three buildings?"
That's a very good question because three buildings are less efficient than one and efficiency has been a driving design force. However, with each room functioning in multiple ways, and only 860+ sq. ft. of heated space, we knew we'd need room from one another. Each of us would need private space to make noise without damaging our relationship. Ed loves loud rock n' roll. I only like it a little. I love loud opera, Ed likes it only a little. The operative word here is "loud". I rarely vacuum our apartment because I can't play opera loud, and, in my mind, that is the only way to vacuum or clean house -- opera and incense. Our fellow apartment dwellers wouldn't like either. They'd like Ed's music even less. With separate buildings we can cut loose.
Also, we find as we age our sleep patterns are strange, with one or the other of us prowling the house at 3:00 or 4:00 in the morning. We entertain ourselves as best we can without bothering our sleeping partner or we search for another bed so we can toss and turn to our heart's content. We call it "sleeping around". With our separate buildings we can use our computers; listen to music; turn on the lights to read; make jam; or even take a bath without bothering one another. And with house guests we can all have wonderful visits and then retire to separate spaces -- small, but separate spaces.
Our retreats are not just "heated" retreats. Each building also has outdoor covered areas for enjoying inclement weather without getting soaking wet. Being forced inside just because it's raining is painful to me because I so love being in the weather, but don't much want to always get wet. Outdoor covered areas expand our home significantly without adding to our heating costs.
Accordingly we have 2000 sq. ft. of roof area, with only 860 sq. ft. of it heated The summer months will turn our main living space into one seamless indoor/outdoor room. Even our kitchen is designed to partly move outside during the warm weather, with carts we can use for food preparation on the kitchen patio.
Our new home, to the extent possible given building codes and the like, turns the average home's design on its ears. We definitely are not building the realtor's or banker's dream home of a three car garage, four bedrooms, three bathrooms, entry hall, dining room, living room, and huge kitchen. We didn't build for someone else, but for us. I've always rejected the usual resale argument and created special, if not normal, homes. Resale has always been swift and financially rewarding. Will it be with this home? Who knows but we don't plan on that being our problem. At our ages, this is the home we hope to end our lives in, barring the need for, God forbid, a nursing home. However, I suspect, given the popularity of living small, with solar and in town, resale will not be a problem. Others will determine that though (I hope!).
On another note, when we purchased our carriage doors (two are used to close up the shop area) there was a set of three available. We only needed two, but purchased all three because that's how they came and it's difficult to locate carriage door. We'd planned on selling the third. Today I'm off to paint the third carriage door because we now have found the perfect use for it. Stay tuned.