1 Title, commencement and application
1 The title of these Regulations is the Housing Health and Safety Rating System (Wales) Regulations 2006 and they come into force on 30 June 2006.
2 These Regulations apply in relation to residential premises in Wales.
The powers conferred by sections 2 and 4 of the Act are exercisable, as respects Wales, by the National Assembly for Wales. See the definition of “the appropriate national authority” in section 261(1).

2 Interpretation
In these Regulations—
“the Act” (“Y Ddeddf”) means the Housing Act 2004;
“harm” (“niwed”) means harm which is within any of Classes I to IV as set out in Schedule 2 to these Regulations;
“inspector” (“arolygydd”) means a person carrying out an inspection under section 4 of the Act (inspections by local housing authorities to see whether a category 1 or 2 hazard exists); and
except in regulation 6(7)(e), “occupier” (“meddiannydd”) includes potential occupier.

3 Prescribed descriptions of hazard
1 A hazard is of a prescribed description for the purposes of the Act where the risk of harm is associated with the occurrence of any of the matters or circumstances listed in Schedule 1.
2 In Schedule 1, a reference to a matter or circumstance is, unless otherwise stated, to a matter or circumstance in or, as the case may be, at the dwelling or HMO in question, or in any building or land in the vicinity of the dwelling or HMO.

4 Prescribed fire hazard
For the purposes of section 10 of the Act a category 1 or 2 hazard is a prescribed fire hazard if the risk of harm is associated with exposure to uncontrolled fire and associated smoke.
See the definition of “category 1 hazard” and “category 2 hazard” in section 2(1) of the Act.

5 Inspections
An inspector must—
(a) have regard to any guidance for the time being given under section 9 of the Act in relation to the inspection of premises;
(b) inspect any residential premises with a view to preparing an accurate record of their state and condition; and
(c) prepare and keep such a record in written or in electronic form.

6 Seriousness of hazards
1 Where, following an inspection of residential premises under section 4 of the Act, the inspector—
(a) determines that a hazard of a prescribed description exists; and
(b) considers, having regard to any guidance for the time being given under section 9 of the Act in relation to the assessment of hazards, that it is appropriate to calculate the seriousness of that hazard,
the seriousness of that hazard must be calculated in accordance with paragraphs (2) to (4) of this regulation.
2 The inspector must assess the likelihood, during the period of 12 months beginning with the date of the assessment, of a relevant occupier suffering any harm as a result of that hazard as falling within one of the range of ratios of likelihood set out in column 1 of Table 1.
Table 1
Column 1	Column 2
Range of ratios of likelihood	Representative scale point of range
Less likely than 1 in 4200	5600
1 in 4200 to 1 in 2400	3200
1 in 2400 to 1 in 1300	1800
1 in 1300 to 1 in 750	1000
1 in 750 to 1 in 420	560
1 in 420 to 1 in 240	320
1 in 240 to 1 in 130	180
1 in 130 to 1 in 75	100
1 in 75 to 1 in 42	56
1 in 42 to 1 in 24	32
1 in 24 to 1 in 13	18
1 in 13 to 1 in 7.5	10
1 in 7.5 to 1 in 4	6
1 in 4 to 1 in 2.5	3
1 in 2.5 to 1 in 1.5	2
More likely than 1 in 1.5	1
3 The inspector must assess which of the four classes of harm (set out in Schedule 2) a relevant occupier is most likely to suffer during the period mentioned in paragraph (2).
4 The inspector must—
(a) assess the possibility of each of the other classes of harm occurring as a result of that hazard, as falling within one of the range of percentages of possibility set out in column 1 of Table 2;
(b) record each possibility so assessed as the corresponding RSPPR set out in column 2 of Table 2; and
(c) record the possibility (which is known for the purposes of the formula in paragraph (5), as the RSPPR) of the most likely class of harm occurring as a percentage calculated using the following formula—
100%-(A+B+C)
Where—
A is the RSPPR recorded under sub-paragraph (b) as the second most likely class of harm;
B is the RSPPR recorded under sub-paragraph (b) as the third most likely class of harm; and
C is the RSPPR recorded under sub-paragraph (b) as the fourth most likely class of harm.
Table 2
Column 1	Column 2
Range of percentages of possibility	Representative scale point of the percentage range (RSPPR)
Below 0.05%	0%
0.5 to 0.15%	0.1%
0.15% to 0.3%	0.2%
0.3% to 0.7%	0.5%
0.7% to 1.5%	1%
1.5% to 3%	2.2%
3% to 7%	4.6%
7% to 15%	10%
15% to 26%	21.5%
26% to 38%	31.6%
Above 38%	46.4%
5 When the inspector has assessed the likelihood under paragraph (2) and assessed the possibility of each harm occurring under paragraph (3) the seriousness of that hazard must be expressed by a numerical score calculated using the following formula—
S1+S2+S3+S4
Where—

S1
10000 × (1/L) × O1

S2
1000 × (1/L) × O2

S3
300 × (1/L) × O3

S4
10 × (1/L) × O4
6 For the purposes of the formula in paragraph (5)—
(a) L is the representative scale point of range in column 2 of Table 1 corresponding to the range that has been recorded under paragraph (2);
(b) O1 is the RSPPR recorded under paragraph (4) in relation to Class I harm;
(c) O2 is the RSPPR recorded under paragraph (4) in relation to Class II harm;
(d) O3 is the RSPPR recorded under paragraph (4) in relation to a Class III harm;
(e) O4 is the RSPPR recorded under paragraph (4) in relation to Class IV harm.
7 In this regulation—
“relevant occupier” (“meddiannydd perthnasol”) means where the risk of harm concerned is associated with the occurrence of any of the matters or circumstances listed in—
(a) paragraph 1 of Schedule 1, an occupier under the age of 15 years;
(b) paragraph 2, 3 or 6(a) of Schedule 1, an occupier aged 65 years or over;
(c) paragraph 7 of Schedule 1, an occupier under the age of 3 years;
(d) paragraph 8 of Schedule 1, an occupier aged 60 years or over who has been exposed to radon since birth;
(e) paragraph 11 of Schedule 1, the actual occupier;
(f) paragraph 17, 22, 23 or 25 of Schedule 1, an occupier under the age of 5 years;
(g) paragraph 19, 20, 21, 24 or 28 of Schedule 1, an occupier aged 60 years or over;
(h) paragraph 26—
(i) except where a collision is with low architectural features, an occupier under the age of 5 years, and
(ii) where a collision is with low architectural features, an occupier aged 16 years or over;
(i) in any other paragraph of Schedule 1, any occupier; and
“RSPPR” means the representative scale point of the percentage range.
8 In making assessments under this regulation, an inspector must have regard to any guidance for the time being given under section 9 of the Act.

7 Prescribed bands
For the purposes of the Act a hazard falls within a band identified by a letter in column 1 of Table 3 where it achieves a numerical score calculated in accordance with regulation 6(5) which is within the range corresponding to that letter in column 2 of that Table.
Table 3
Column 1	Column 2
Band	Numerical Score Range
A	5000 or more
B	2000 to 4999
C	1000 to 1999
D	500 to 999
E	200 to 499
F	100 to 199
G	50 to 99
H	20 to 49
I	10 to 19
J	9 or less

8 Category of hazard
For the purposes of the Act—
(a) a hazard falling within band A, B or C of Table 3 is a category 1 hazard; and
(b) a hazard falling within any other band in that Table is a category 2 hazard.
Signed on behalf of the National Assembly for Wales under section 66(1) of the Government of Wales Act 1998.
1998 c. 38.
D. Elis-Thomas The Presiding Officer of the National Assembly 27 June 2006