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Reviewed 25.10.2026England focus

Jasmine Gokmen
In forceRetrofit & Existing Buildings

PAS 2035: Retrofit of existing dwellings

PAS 2035:2023 and PAS 2030:2023

A whole-dwelling retrofit framework requiring assessment, a medium-term improvement plan, design, installation, commissioning and handover.

Also known as: PAS2035, PAS 2035, PAS 2030, retrofit

Jurisdiction
UK
Document type
Technical standard
Edition
2023 editions
Source updated
Not stated by publisher
Applies from
2023
Topic
Retrofit & Existing Buildings

Key requirements

  • PAS 2035:2023 sets the specification and guidance for retrofit.
  • PAS 2030:2023 covers installation, commissioning and handover.
  • A whole-dwelling assessment and medium-term improvement plan are central.
  • Risk assessment, moisture and ventilation are considered together.
  • Used in government-funded retrofit programmes and by accredited installers.

Performance at a glance

Framework
Whole-dwelling retrofit
Stages
Assess → plan → design → install

Applies to

Retrofit of existing dwellings in the UK.

Official source

BSI — PAS 2035

Open official source

Related records

Part L · Conservation of fuel and powerPart F · VentilationPart O · OverheatingPassivhaus · Passivhaus Classic

Reviewed 25 October 2026. This summary is an editorial reference, not legal advice. Check the current official text and confirm the approach with building control before relying on it. Browse all 35 records.