This document provides guidance on accommodations in secondary schools, concentrating on the needs of 11- to 16-year-old pupils. The guidance is intended to assist all those who may be involved in the briefing and design process. It discusses the issues that arise when considering both new and existing accommodations. The document covers the range of teaching and non-teaching spaces likely to be required, and gives guidance on planning a suite of spaces with reference to the acoustic environment. It also describes the size, shape, and planning of teaching and non-teaching spaces; gives advice on furniture used in each type of space; provides a brief guide to the mechanical and electrical servicing requirements for music spaces; and outlines some of the key points of environment design. Concluding sections provide case studies showing the application of this guidance to existing schools and general cost information and analysis using one of the case studies. Appendices include a checklist of design considerations and two glossaries. (Contains 24 references.) (GR)