England & Wales Building Regulations: Part L1B conservation of fuel and power: Existing dwellings - A summary of requirements (Version 2)

Approved Document L1B (ADL1B) seeks to improve the energy efficiency of existing dwellings as and when they are renovated, extended or altered. Because we are only adding a small percentage to our housing stock each year, improvements are necessary to existing housing if we are to make an appreciable improvement to the energy requirements of the nation's dwellings.

This Construction Briefing is only concerned with the requirements of Part L1B, and gives readers an overview of the requirements, particularly those related to thermal elements such as external walls, floors, roof, windows and doors, and the alteration of materials.

Contents:

• Definitions
• Thermal elements - external walls, floor, roofs, windows and doors
  • General
  • Renovation
  • Material alteration
  • Material change of use
  • Extension
• Energy efficiency of controlled services (eg heating, lighting etc)
• Feasibility
• Design flexibility
• Historic buildings