# The Building Regulations &c. (Amendment) (Wales) Regulations 2013, Regulation 20: Interpretation of Part 6


In regulation 35(1)—
(a) after the definition of “building” insert—
"“building envelope” in relation to a building means the walls, floor, roof, windows, doors, roof windows and roof-lights;
(b) after the definition of “energy assessor”—
(i) omit “and”; and
(ii) insert—
““major renovation” means the renovation of a building where more than 25% of the surface area of the building envelope undergoes renovation; and
“nearly zero-energy building” means a building that has a very high energy performance, as determined in accordance with a methodology approved under regulation 24, where the nearly zero or very low amount of energy required should be covered to a very significant extent by energy from renewable sources, including energy from renewable sources produced on-site or nearby.”; and
(c) omit the definition of “recommendation report”.

---
Source: https://www.legislation.gov.uk/wsi/2013/747/regulation/20 (the official version)
Page: https://openlegislation.uk/building-regulations-c-amendment-wales-regulations-2013/regulation-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.