This paper is based on a report prepared jointly for the Department of Housing and Urban Development (HUD) and the Department of Energy (DOE) under activities carried out by the National Bureau of Standards (NBS) relative to the Solar Heating and Cooling Demonstration Program. Regulatory information was abstracted from HUD contractor developed questionnaires and analyzed to determine perceived regulatory constraints which might inhibit, impede, or otherwise adversely affect the installation and use of solar hot water and space and/or cooling systems. The paper documents and analyzes building regulatory information gathered by HUD Contractor personnel during the course of the Solar Residential Demonstration Program--from inception of the program (late 1975) through September 30, 1978. The paper concludes that existing codes do not present a barrier to the installation and acceptance of solar systems; however, code officials need additional training and better back-up material to properly evaluate solar systems.