that is neither an ancillary building nor an outbuilding; and

that is a new structure that complies with, or is an existing building that complies with the scope limitations of, NZS 3604:1999, or NZS 4229:1999, or both (and for the purposes of this clause the following must be treated as complying with those standards:

• (a) foundations, lintels, and roof structures, if they are specifically designed, or proprietary; and

• (b) conservatories, porches, pergolas, and similar low-risk structures, if they are specifically designed); and

whose building envelope (whether the building is a new structure or an existing building) has a total risk score (calculated under Part 4) that does not exceed 12 for any external elevation; and

whose use (determined, whether the building is a new structure or an existing building, in accordance with regulation 6 and Schedule 2 of the Building (Specified Systems, Change the Use, and Earthquake-prone Buildings) Regulations 2005) is either SH (sleeping single home) or SR (sleeping residential); and

that, if the building's use (as so determined) is SR, contains no more than 2 household units that—

• (a) are adjacent on a horizontal plane; and

• (b) share (that is, are on opposite sides of) a single common wall; and

that is not, and does not form part of, a place registered as a historic place on the register established and maintained under section 22 of the Historic Places Act 1993.

a building whose importance level (determined in accordance with table 3.2 (importance levels for building types—New Zealand structures) of AS/NZS 1170.0:2002), is one of the following importance levels (each of which is described in general terms as follows):

• (a) importance level 3 (structures that as a whole may contain people in crowds or contents of high value to the community or pose risks to people in crowds); or

• (b) importance level 4 (structures with special post-disaster functions); or

• (c) importance level 5 (special structures):

a building that is, or forms part of, a place registered as a category 1 historic place on the register established and maintained under section 22 of the Historic Places Act 1993:

a building that exceeds the occupancy load limits (in numbers of people) determined under Part 5 because either or both of the following situations exists:

• (a) the actual or intended occupancy of any of the spaces in a single storey of the building exceeds, or will exceed, the occupancy load limit (a number of people) determined under Part 5 for that space:

• (b) the actual or intended occupancy of all of the spaces in a single storey of the building exceeds, or will exceed, the occupancy load limit (a number of people) determined under Part 5 for all of those spaces.

A total risk score for an external elevation on the building envelope of a building is calculated by using the calculation table in clause (2) and completing the following steps:

• (a) for each specified risk factor, use the definitions of risk table in clause (3) to decide whether the risk severity is low, medium, high, or very high, and enter the applicable score; and

• (b) copy the applicable score for each risk factor to the column whose heading is “Subtotals for each risk factor”; and

• (c) add all the scores copied into that column to arrive at the total risk score for the external elevation.

The calculation table is as follows:

The definitions of risk table is as follows:

The occupancy load limit (see clause (3)(a) of Part 3) for any of the spaces in a single storey of a building is the number (of people) referred to in paragraph (d), and is determined by completing the following steps:

• (a) determine the use of the space; and

• (b) identify, in the table in clause (5), the column whose heading is, or includes, that use; and

• (c) determine the escape height for the storey; and

• (d) identify the number in that column of that table and that is opposite to that escape height.

The occupancy load limit (see clause (3)(b) of Part 3) for all of the spaces in a single storey of a building is the number (of people) referred to in paragraph (c), and is determined by completing the following steps:

• (a) determine the escape height for the storey; and

• (b) identify, in the table in clause (5), the column whose heading is “total”; and

• (c) identify the number in that column that is opposite to that escape height.

In Part 3 and this Part, unless the context otherwise requires,—

A mezzanine floor in a building must for the purposes of Part 3 and this Part be treated (despite clause (3)) both—

• (a) as if it were a floor in the building whose upper surface is the lower limit of a storey of the building; and

• (b) as part of the next below floor in the building.

The table referred to in clauses (1), (2), (6), and (7) is as follows:

The acronyms in the column headings of the table in clause (5) denote the following uses:

• (a) CL—Crowd Large:

• (b) CM—Crowd Medium:

• (c) CO—Crowd Open:

• (d) CS—Crowd Small:

• (e) IA—Intermittent Low:

• (f) ID—Intermittent Medium:

• (g) SA—Sleeping Accommodation:

• (h) SC—Sleeping Care:

• (i) SD—Sleeping Detention:

• (j) SH—Sleeping Single Home:

• (k) SR—Sleeping Residential:

• (l) WF—Working Fast:

• (m) WH—Working High:

• (n) WL—Working Low:

• (o) WM—Working Medium.

Despite clauses (1) to (5), the numbers in the column headed WH/WF in the table in clause (5) apply to a space in a storey of a building for the purposes of the limit specified in clause (1) only if the space's floor area exceeds 20 m².