Effective 6 April 2013. This edition reduces the range of electrical installation work that is notifiable. In addition, installers who are not registered competent persons can now use a competent person to certify work as an alternative to using building control. The technical guidance throughout now refers to BS7671:2008 incorporating Amendment No 1:2011. This Approved Document has a fresh new look and has been totally re-designed into a single column format to make reading. It has also been subject to a thorough editorial review to make the text/content more reader-friendly and simpler to assimilate and understand. Contracts and Management Publications Update Service: To ensure that you have the most up-to-date Approved Document or Amendment to an Approved Document to hand, you can now join our CAMPUS service. RIBA Bookshops will automatically send you copies of new releases as and when they are published. Visit our CAMPUS page for further details.

Effective 1 July 2013. This edition is updated in the light of the European Construction Products Regulations 2011, and particularly confirms the requirement that building products covered by a harmonised European standard should normally have CE marking. Guidance on resistance to moisture and substances in the subsoil has been deleted as it is in Approved Document C, as have examples of materials susceptible to changes in their properties. This Approved Document has a fresh new look and has been totally re-designed into a single column format to make reading. It has also been subject to a thorough editorial review to make the text/content more reader-friendly and simpler to assimilate and understand. Contracts and Management Publications Update Service: To ensure that you have the most up-to-date Approved Document or Amendment to an Approved Document to hand, you can now join our CAMPUS service. RIBA Bookshops will automatically send you copies of new releases as and when they are published. Visit our CAMPUS page for further details.

This guide provides detailed guidance for the installation of fixed building services in new and existing dwellings to help compliance with the energy efficiency requirements of the Building Regulations. The guide covers the design, installation and commissioning of:* Conventional means of providing primary and secondary space heating, domestic hot water, mechanical ventilation, comfort cooling and internal and external lighting.* Low carbon generation of heat by pumps, solar thermal panels, and micro-combined heat and power systems. The guide sets out recommended minimum energy efficiency standards for components of building services systems, including the use of controls. For systems installed in new dwellings, the standards are design limits (or backstop values). For new or replacement systems and components installed in existing dwellings, the standards represent reasonable provision for complying with the Building Regulations. Changes to the 2018 edition The 2018 amendments to the guidance come into effect on 6 April 2018 and the key changes are as follows:* A new, higher efficiency standard for replacement gas-fired boilers in dwellings.* A requirement to install time and temperature control for all gas and oil-fired boiler installations, including replacement boilers.* A requirement, when replacing a gas-fired combination boiler to install at least one energy-efficiency measure from the following list:o flue gas heat recovery systems o weather compensation o load compensation o smart controls with automation and optimisation functions Contents Introduction * Gas-fired space and water heating * Oil-fired space and water heating * Electric heating * Solid fuel heating * Community heating * Underfloor heating * Mechanical ventilation * Heat pumps * Comfort cooling * Solar water heating * Lighting * Micro-combined heat and power * Heating system circulators * Abbreviations