PAS 2035 is a publicly available specification developed by the British Standards Institution (BSI) in the United Kingdom. It specifically pertains to the retrofitting of domestic buildings to improve energy efficiency. The document provides a framework for the planning, design, execution, and monitoring of energy retrofits in existing homes.

Here are some key points about PAS 2035:

1. Purpose: PAS 2035 aims to ensure that energy retrofit projects are carried out in a systematic and effective manner, taking into account the specific characteristics of each building.
2. Holistic Approach: It promotes a holistic approach to retrofitting, considering not only the building fabric and energy efficiency measures but also the occupants’ needs and the indoor environment.
3. Risk-based Approach: PAS 2035 introduces a risk-based methodology to assess and address potential issues associated with retrofitting projects. This involves identifying and mitigating risks to the building and its occupants.
4. Quality Management: The specification emphasizes the importance of quality management throughout the retrofit process, from the initial assessment to the completion of the works.
5. Professional Roles: PAS 2035 introduces the concept of a Retrofit Coordinator who is responsible for overseeing the entire retrofit process. Various professionals, such as Retrofit Assessors and Retrofit Designers, may be involved in different stages of the process.
6. Mandatory Requirements: The document sets out mandatory requirements that must be followed during the retrofit process, ensuring compliance with industry standards and best practices.

It’s important to note that standards and specifications may be subject to updates and revisions. Therefore, it’s advisable to check for the latest version and any developments related to PAS 2035 from authoritative sources or the British Standards Institution.