What is part Q?

House situated in a beautiful landscape with natural looking windows

Building regulation Part Q came into effect on October 1st 2015, with compliance phased over 12 months, and affects any residential building, renovation or refurbishment project that requires planning permission.

All plans or building notices submitted after 1st October 2015 have to comply with Part Q, which relates to any door or window installed in a ‘dwelling’ (including flats and apartments) and which can be easily accessed by a burglar, including balcony and casement doors, and units installed above flat or gently sloping roofs within 3.5m of ground level.

To meet Part Q requirements, windows and doors must satisfy new standards of robustness, use approved hardware, and demonstrate proven security performance.

What evidence is required?

Part Q compliant windows and doors must have either:

  • test evidence for each individual unit
  • third party certification of compliance
  • proof of compliance with Appendix B – supplied with products already meeting Part Q requirements.

Who must comply?
Anyone who requires planning permission to build, renovate or refurbish a residential dwelling - architects, builders, installers and building owners, including home-owners and property developers. For more information, visit www.planningportal.gov.uk




Frequently asked questions

What are Part Q compliant windows and doors?


Building regulation Part Q affects any new residential building. Approved Document Q is designed to ensure the prevention of unauthorised access to dwellings (including flats). As part of this, doors and windows or roof lights which could be accessed will need to resist physical attack by a casual or opportunist burglar.

What's the difference between Part Q and Secured by Design?


Both standards call for windows and doors to be made to meet specific security requirements. However Part Q is essentially concerned with the security of doors and windows, while the requirements of SBD include other elements of the building and their surroundings. Therefore compliance with Part Q alone will not achieve full SBD certification.

Futhermore, Part Q can be a legal requirement for your project, while SBD is not mandatory.

Is Part Q mandatory for windows and doors?


Windows and doors Part Q is mandatory for most of new buildings. Part Q does not apply to replacement windows and doors.