In this Part—

• “building” means the building as a whole or parts of it that have been designed or altered to be used separately;

• F1“building envelope” in relation to a building means the walls, floor, roof, windows, doors, roof windows and roof-lights;

• “Crown authority” means the Crown Estate Commissioners, a Minister of the Crown, a government department, any other person or body whose functions are performed on behalf of the Crown (not being a person whose functions are performed on behalf of Her Majesty in her private capacity), or a person acting in right of the Duchy of Lancaster or the Duchy of Cornwall;

• “Crown interest” means an interest belonging to Her Majesty in right of the Crown, or belonging to a Government Department, or held in trust for Her Majesty for the purposes of a government department;

• “Crown building” means a building in which there is a Crown interest or a Duchy interest;

• “Duchy interest” means an interest belonging to her Majesty in right of the Duchy of Lancaster, or belonging to the Duchy of Cornwall;

• “energy assessor” means an individual who is a member of an accreditation scheme approved by the Secretary of State in accordance with regulation 30; F2...

• F3“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.

• F4...