Building Risk Assessment

Building Risk Assessment (BRA) is a tool used to assess the risks to people in occupied buildings in the facility.

Building Risk Assessment


Building Risk Assessment (BRA) is a tool used to assess the risks to people in occupied buildings in the facility. This is also sometimes identified as an Occupied Building Risk Assessment (OBRA).


Stages of a BRA


FSES apply the three stages of the BRA as required. The three stages are as follows:

Three Stages of conducting a Building Risk Assessment.

Stage 1: Building Screening

In this stage FSES will screen the building based on the occupancy and function of the buildings in the scope of work. Buildings found to be of low occupancy and low risk function will be eliminated from the assessment at this stage.

Stage 2: Building Hazard Assessment

The consequences identified from the Fire, Explosion and Toxic Gas Dispersion and Explosion analysis is used to determine the effects of the hazardous releases on the buildings in Stage 2. Mitigation and Risk reduction measures are typically identified in this stage if required.

Stage 3: Risk Management Assessment

In instances where further risk reduction measures are not appropriate, a risk management assessment will be conducted to evaluate the risks associated with the building.


Method of Conducting BRA


FSES apply a software based approach using DNV PHAST. The consequence models are analysed and the risk is calculated to the various occupied buildings taking account of the average building occupancy.



  • What inputs are required by FSES to conduct the BRA?

As a minimum the following information would be required to conduct the study:

  • Existing PHA / HAZOP report
  • Consequence Analysis Models
  • List and Drawings of occupied buildings
  • Building Occupancy figures

Based on the project requirements, additional information may be required. This will be highlighted within the Terms of Reference (ToR).


  • What is the expected output of the BRA?
On award of the study FSES will issue a project ToR. This will highlight the assumptions that will be made in the study. It will also include the methodology that will be utilised as well as any further information required from the client.
Upon acceptance of the ToR, FSES will conduct the analysis and prepare a BRA report. The report will describe the facility, the scope of work, include a detailed methodology, the identified buildings, the occupancy of each building, the results of each stage of the assessment and any recommendations and identification of further mitigation measures based on the results.


Why FSES?  


FSES have conducted several BRA’s for clients around the world. FSES thus know the requirements of conducting a successful BRA to the pleasure of the client. FSES can also conduct the preceding consequence analysis, as well as other risk analyses such as QRA’s to quantify the total risk to the facilityFor more information, or to discuss your needs for conducting a BRA, contact us using the form below or email .