Last edited 11 Oct 2020

Domestic building services compliance guide

The Domestic Building Services Compliance Guide is a government publication that provides guidance on the installation of building services in new and existing properties to assist in complying with the energy efficiency requirements of the Building Regulations.

It provides more detailed information on the guidance contained in Approved Document L1A: Conservation of fuel and power in new dwellings, and Approved Document L1B: Conservation of fuel and power in existing dwellings.

The Domestic Building Services Compliance guide 2013 edition (incorporating 2018 amendments) came into effect on 6 April 2018.

The guide is concerned with the installation of:

It sets out recommended minimum energy efficiency standards for components of building services systems, including controls. For systems installed in new buildings, the standards are design limits. For new or replacement systems and components installed in existing buildings, the standards represent reasonable provision for complying with the building regulations.

It also provides supplementary information regarding good practice that exceeds the minimum standards, such as Microgeneration Certification Scheme standards.

The guide is broken down into four fuel-based sections and nine technology-specific sections:

Fuel based:


Relevant European and UK legislation in relation to fixed building service product design and fitting include:

The 2018 amendments introduced revised standards for when gas-fired and oil-fired boilers are installed or replaced in existing dwellings.

See also: Non-domestic building services compliance guide.

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