England · Statutory guidance
Conservation of fuel and power: Approved Document L, Volume 2 — Buildings other than dwellings
Energy performance guidance for non-domestic buildings, covering fabric, services, controls and commissioning.
- Edition
- 2021 edition incorporating 2023 amendments · Volume 2; later editions and transitions on source page
- Search coverage
- 116 of 116 PDF pages · 2 OCR pages
Energy & sustainability
Open original PDF at page 77 Source wording and page order preserved. Drawings and table layouts remain available in the original PDF.
O N L I N E V E R S IRO N40, R40A
9.11 If carrying out work on an existing system fundamentally alters the energy performance or CO
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emissions performance of the system then the complete altered system should be assessed and
the guidance for new or replacement systems in paragraph 9.9 should be followed. Such work may
include the following.
a. A change in heating fuel for a space heating or domestic hot water system.
b. Extending or expanding the capacity of a space heating, comfort cooling or ventilation system
by over 25% of its previous capacity.
9.12 Where building work is carried out on first fit-out (for example, shell and core buildings or partially
occupied buildings) the building log-book should be updated, following paragraphs 9.7 to 9.11, and
provided to the building owner.
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Building Regulations 2010 Approved Document L Volume 2, 2021 edition
O N L I N E V E R S I O N
Edition and local adoption determine which requirements apply. Use the publisher’s document for the complete clauses, diagrams and amendments.