PAS 2035 -Introduction-

Energy retrofit of domestic Dwellings framework.

Through a "Whole building approach", the PAS 2035, conveys a best-practice guidance taking into account the occupants, the individual units, and the oversight of assessment, design, delivery, and use. It is not mandatory for retrofits, but since 2021, it has become a requirement for any publicly funded retrofit projects.

The 2023 update will come in vigor March 2023.

According to the PAS 2035 Standard, there are 11 steps in the process of retrofitting a dwelling with energy efficiency

1. Preliminaries

2. Risk assessment

3. Whole-dwelling assessment

4. Retrofit design

5. Installation

6. Testing and commissioning

7. Handover

8. Retrofit advice

9. Monitoring and evaluation

10. Claims of compliance

11. Qualifications

In this Standard, the involved professional roles are defined as follows:

1. The (Retrofit) Advisor. Provides advice to both the client and end user in terms of what may work in terms of retrofit and how to use the retrofit once the work is undertaken

2. Asesor. Provides an in-depth assessment of the current arrangement and build of the property and how it may be improved.

3. Coordinator. End-to-end role with full responsibility for demonstrating compliance with PAS 2035. Oversight of both the installation and handover phases, working alongside the installer

4. Designer. Develops the assessment and the median term retrofit strategy to provide a fully compliant retrofit design

5. Installer. Contractor who installs the retrofit measures specified following PAS 2030.

6. Evaluator. Monitoring and evaluations post fit-out of the retrofit.