DSN design offers residential planning and design for prospective homeowners and contractors with well designed and reasonably priced construction documents for custom homes, tract housing, small multi-family housing projects, remodels, and additions. Specializing in energy efficient design with innovative heating and cooling systems, we have worked on projects as small as kitchen and bath face lifts on existing residences to 2,000 square foot additions and 5,800 square foot custom residences.