BCC 13-02 June 2007

LIGHTING

Vulnerable age

No particular age group

Related hazards

None

DESCRIPTION OF HAZARDS

Front & Rear Elevations

HHSRS Operating Guidance 2006: 5/07

Multiple locations

Yes

No

Secondary hazards

No

No

Dwelling: Basement/Sub-basement maisonette in a six- storey

pre-1920 converted property.

Light well to lounge-diner in rear courtyard with

bedroom windows above

None

LIST OF RELEVANT MATTERS

LIKELIHOOD & OUTCOMES

Compounding matters -

a

Obstruction

3

Key

3

Seriously defective

b

Size, shape, position

-

2

Defective

c

Position of artificial lighting

-

1

Not satisfactory

d

Control of artificial lighting

-

-

Satisfactory/NA

e

Glare etc.

-

f

Window view

3

g

Outlook

3

Front Entrance to

Basement Level

Front Courtyard

Background: This a maisonette on the lower two stories of a listed Georgian property converted into 5 separate

flats. It has it's own entrance at basement level and comprises a kitchen, bathroom and lounge-diner at sub-

basement level and three bedrooms and a further bathroom on the basement floor. All the rooms at this level are

below ground but have windows which look out onto courtyards and face ground level (at ceiling height) within

1800-2500mm. The rear courtyard provides recreational space with a reasonable outlook. That at the front is the

smaller of the two and offers less of an outlook. Natural lighting is reasonable at the basement level. The sub-

basement kitchen receives natural light via a small light-well as does the lounge-diner but on two sides. These

rooms have no outlook. The bathroom has artificial lighting and ventilation only.

OUTCOMES

Av: 0.1

Class I

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 0.9

Class II

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Av: 9.0

Class III

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Class IV

< 0.05 0.15 0.3

0.7

1.5

3

7

15

26

38 >

Justification

There is nothing to justify changing the spread of outcomes from the national average.

Av: All dwellings: <1

A B C D E

F

G H

I

J

RATING

%

Av: 90.0

Score:

RATING SCORES AFTER IMPROVEMENT

IMPROVE

Likelihood to

1 in 180

Outcomes to

0.1

1.0 10.0 88.9

%

Justification

The local planning authority has indicated that listed building consent would not be available to alter the

configuration of the courtyard areas and woud pemit no more than a 20% increase in the size of the sub-basement

light-wells. It is not practicable to alter the size of the courtyards or to reduce levels. The planning restrictions

mean only a small amount of work to enlarge the lightwells can be undertaken to reduce the likelihood. It may be

possible to reverse of location of the accommodation i.e, bedrooms relocated to the sub basement and kitchen and

living area to the basement level which would reduce the likelihood marginally.

Av: <1

A B C D E

F

G H

I

J

Average likelihood, outcomes and HHSRS score for hazards from inadequate lighting for all

person in all dwellings,1995-96.

NEW RATING

Av: Nos

Score: 32

BCC 13-02 June 2007

HEALTH AND SAFETY RATING SYSTEM SCORES

1 in

100

LIKELIHOOD

Low

High

Av: All dwellings: 50,825

< 4200 2400 1300 750 420 240 130

75

42

24

13

7.5

4

2.5

1.5 >

Justification

Most rooms have adequate natural lighting levels but poor to very poor outlooks onto courtyards. (The lack of

natural lighting or outlooks to the bathroom is not considered significant). In the two rooms having the poorest

outlook and natural lighting, kitchen and lounge–diner, it will be hard to carry out normal domestic activities witho

artificial lighting. These factors justify increasing the likelihood of a hazardous occurrence significantly. However,

this is ameliorated somewhat by reasonable levels of natural lighting in most other rooms and the outlooks over the

recreation space.

0.1

1

10

88.9

58