This document offers guidance in the accommodation needs for teaching the sciences in secondary education, either through new construction or the adaptation of existing buildings. Section 1 outlines the range of spaces usually required and examines planning options in new and adapted departments. Section 2 describes the planning of an individual laboratory, covering services distribution, servicing systems, and room layouts. A number of furnished plans are illustrated. Section 3 provides guidance on the teaching and non-teaching spaces supporting the laboratories. Section 4 covers items used in the laboratory and preparation room. Section 5 gives general guidance on services in the science department. Information on appropriate flooring is also included. Section 6 describes adaptation studies in three existing schools, based on the guidance in other sections. Section 7 provides general building cost guidance as well as more detailed information on the cost of servicing systems and fume cupboards. A cost analysis of two adaptation studies are included. Appendices contain a checklist, 42-item bibliography, and glossary of terms. (GR)