This section specifies exposure categories for external doorsets and windows based on air permeability, water tightness, and wind resistance to ensure buildings are protected from rain infiltration and draughts while maintaining energy efficiency.

Part of Building Regulations 2010 in England, Document L sets mandatory standards for fuel, power conservation and carbon emission reduction in new and existing buildings.

Part of Building Regulations 2010 in England, Document M requires buildings be accessible to all. This includes new builds and significant refurbishments.

Effective from 2015, Document Q (ADQ) requires new dwellings to feature doors and windows that resist physical attacks by burglars. It mandates that all easily accessible windows and doors meet the security standards verified by PAS 24:2002.