I have a corner of our garage set aside. I have the windows blocked, and wait for the sun to go down in order to avoid any fogging from light leaks. It is kind of a drag because our washer and dryer are out there too, so it is a constant battle against dust. I am planning on buying a cedar outbuilding when we get our own place (we rent now) and dedicating it to darkroom and photo storage. a 10X8 building costs about $1500 around here.