Matrix of hazard scores for Fire for pre-1920 houses converted into self-contained flats or bedsits

This matrix summarises the effect of storey height and the level of structural and other fire precautions upon the indicative hazard score generated in respect of the converted flat or bedsit considered most at risk – basically the top floor flat or bedsit

Basic assumptions

If converted into flats there is just one flat on each floor

• If converted into bedsits there are 3 per floor except ground floor which has 2
• The heating system does not contribute towards the fire hazard
• The condition of the electrical system is such that it does not adversely impact upon the hazard score
• There are no other relevant factors to take into account

Average hazard score for pre-1920 flats is 39, Band H. This is also taken as the figure for bedsits as it is a higher score than for the corresponding house.

We are in discussion with the London Fire and Emergency Planning Authority, for them to accredit this matrix. The London Fire Safety Guidance has been accredited both by them and the CIEH

Key to level of protection ratings:

Level 1 - Meets all current standards for structural and other fire precautions

Level 2 - Reasonable level of structural fire protection but lacks AFD/FFE

Level 3 - Typical pre-1985 conversion. Separation between flats and common staircase but no internal fire doors within flat and no AFD/FFE. There is no equivalent construction for bedsits so no assessment has been made for them at this level

Level 4 - No structural or other fire precautions present.

This is a new item on the website - the London Fire Safety Guidance for Houses in Multiple Occupation click here to load it

Additional guidance for assessments of Fire under the HHSRS

This guidance is based upon original research undertaken by the Building Research Establishment (BRE) to support HHSRS briefings given to surveyors working on the English House Condition Survey (EHCS)

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