The DfE has updated guidance documents, which are used for all projects procured by the Department for both new build and refurbishment projects. They can also be used by Local Authorities for their own projects.
Please see below a link to the Department's Output Specification documents:
The Generic Design Brief is the main document and the annexes provide more detailed technical requirements. The Key Principles and Educational Drivers are found in sections 1.6 and 1.7. There are also references to acoustic requirements and to BB93, for sensory rooms etc.
2.7.6.5. The Contractor shall provide information as described in BB93 to demonstrate compliance with the acoustic standards specified in BB93 in accordance with Section 2 of BB93. This shall include plans, construction details, material specifications, and calculations, as appropriate for each area of the School. These shall be included in the acoustics section of the Environmental Strategy Report, as required under the Employer’s Requirements Deliverables, and on acoustics drawings and calculations for Building Control approval. 2.7.6.6. The Contractor shall carry out pre-completion and post-completion testing in accordance with the Good Practice Guide for the acoustic testing of schools published by the Association of Noise Consultants, as required under the Employer’s Requirements Deliverables. 2.7.6.7. Where required for Special Schools, Designated Units or SRP, acousticians and audiologists specialising in hearing impairment and teachers of the deaf shall be consulted to identify the needs of the pupils. The Contractor shall agree these needs with the Employer. Specialist provision such as radio aids shall be provided where specified in the SSB.
A link to BB93 (acoustic design of schools - performance standards) is here:
https://www.gov.uk/government/publications/bb93-acoustic-design-of-schools-performance-standards