THINK SMALL! Whether you call them backyard cottages, in-law apartments or secondary dwelling units, Rainbow Valley will design and build a Small Cottage to fit your needs. We have been designing and building Small Cottages for almost four decades and our professional design staff will ensure your cottage blends naturally with your existing home and surrounding neighborhood. Choose from one of our pre-designed plans or opt for a custom design, and let Rainbow Valley make your Small Cottage dreams a reality.