Blast Impact Assessment
& Mitigation Engineering
A rigorous, threat-informed approach to blast risk — assessing the credible explosive threat your building or asset faces, and providing the mitigation measures that a proportionate response requires. Every assessment we deliver includes mitigation. Every recommendation is right-sized to the actual threat, not to an imagined worst‑case scenario.
Our designs are meticulously calibrated to maintain proper proportion and efficiency.
The instinct in blast design is to default to the most severe credible scenario and design to that threshold across the board. The result is buildings that are over-specified in some areas, under-thought in others, and invariably more expensive than the threat actually warrants.
Proportionality begins with a careful assessment of the explosive threat — the credible charge weights, standoff distances, attack vectors, and consequence levels specific to the site, its use, and its occupants. From that assessment, mitigation measures are derived and specified at the level the threat demands: no more, no less.
Every engagement concludes with a documented set of proportionate, implementable measures — referenced to the standards, costed at outline level, and ready for the project or engineering team to execute.
“A blast‑impact assessment that simply catalogues a building’s weak points—without showing how to remediate them—delivers only half the value you deserve. Our service goes beyond the checklist: we identify every at‑risk asset, explain the underlying vulnerabilities, and prescribe exact mitigation measures. All of this is bundled into a single, comprehensive engagement, every time.”
Proportionality — the principle that drives every specification
Blast mitigation is a discipline where over-specification is both common and expensive. Structural hardening, blast-resistant glazing, and progressive collapse mitigation carry significant cost — and applying them at a level the threat does not require wastes capital that could be deployed more effectively elsewhere in the security strategy.
We begin every engagement with the question: what is the actual credible threat for this specific site? The answer to that question — derived from intelligence analysis, site geometry, the asset profile, and the applicable threat database — determines every specification decision that follows.
Threat-derived, not assumption-driven
Charge weights, standoff distances, and attack scenarios are established through structured threat assessment — not by selecting a conservative standard scenario and applying it universally. The threat the site actually faces determines the design basis event.
Asset-by-asset consequence grading
Not all areas of a building carry the same consequence of blast damage. High-occupancy zones, critical infrastructure rooms, and primary structural elements are graded differently from secondary spaces — and mitigation is prioritised and scaled accordingly.
Mitigation always included
Assessment findings are never delivered without mitigation. Every report concludes with a documented set of proportionate measures — referenced to the applicable standard, with implementation guidance and outline cost indications for the project team.
Defensible and auditable
Every specification decision is traceable to the threat assessment that preceded it. Clients can present the basis of their blast mitigation strategy to insurers, regulators, or a board with full confidence in the methodology behind it.
Scope of Service
Six areas of practice covering the full range of blast assessment and mitigation — from the initial threat characterisation through to structural hardening specification and progressive collapse analysis.
Detailed methodology is discussed in client consultation rather than published here. If you have a specific technical requirement, the right starting point is a confidential conversation.
Blast Threat & Consequence Assessment
Characterisation of the explosive threat relevant to the specific site — establishing the credible charge weights, standoff distances, and attack scenarios that form the design basis event. Consequence analysis identifies the assets, occupancies, and structural elements where blast effects would be most significant, and grades the level of protection required at each. This assessment is the foundation of every subsequent specification decision.
Structural Vulnerability Assessment
For existing buildings, a structural vulnerability assessment establishes how the building would respond to the blast loading scenarios identified in the threat assessment — identifying the primary failure modes, the structural elements most at risk, and the modifications that would most effectively reduce vulnerability. Particularly relevant for brownfield projects, heritage buildings, and assets undergoing change of use to higher-risk occupancies.
Blast-Resistant Facade & Glazing Specification
Glazing failure is the primary cause of blast-related casualties in non-structural building envelopes. We specify blast-resistant glazing systems — laminated, film-applied, or structural — to the ISO 16933 and ISO 16934 test standards, matched to the blast loading the threat assessment establishes. Facade specification covers glazing, framing, anchorage, and the interface with the structural frame — coordinated with the architectural and structural team.
Blast-Resistant Door & Access Point Specification
Doors, louvres, and access points in blast-exposed facades require specification to a defined overpressure and impulse loading. We specify blast-rated door and access systems referenced to the applicable standard, with installation and frame requirements coordinated with the structural engineer — ensuring the rated performance of the product is achievable in the as-built condition.
Progressive Collapse Assessment & Mitigation
Where the blast threat assessment identifies scenarios that could cause localised structural failure, progressive collapse analysis establishes whether that failure could propagate disproportionately through the structure. Mitigation measures — alternative load paths, tying systems, key element design — are specified in accordance with UFC 4-023-03 and the applicable structural standard, in coordination with the project structural engineer.
Independent Blast Design Review
Where blast mitigation designs have been prepared by a structural engineer or another consultant, we provide independent technical review — assessing whether the design basis event is appropriate, whether the specified measures will achieve the required performance, and whether the overall strategy is proportionate to the threat. Particularly valuable where a second opinion is required for governance, insurance, or regulatory purposes.
Greenfield & Brownfield Projects
The point at which blast considerations enter the project determines both what is possible and what it costs. We are experienced in both contexts.
Greenfield Projects
When blast mitigation is considered from the outset of a new build project, the full range of measures is available — and most of them can be incorporated without premium cost. Standoff distances can be maximised in the site layout. Structural systems can be designed for blast resistance from the beginning. Glazing specifications and facade systems can be selected and detailed as part of the architectural design process rather than retrofitted.
Our role in greenfield projects is to provide the threat assessment that informs the design basis event, specify the mitigation requirements that follow, and work alongside the project's structural engineer and facade consultant to ensure those requirements are correctly implemented — from concept through to construction and handover.
Brownfield & Retrofit Projects
For existing buildings — whether undergoing refurbishment, change of use, or subject to a revised threat assessment — the structural vulnerability assessment establishes what the building can and cannot resist under the credible blast loading. From that baseline, retrofit mitigation measures are specified and prioritised: blast film or glazing replacement for the facade, progressive collapse mitigation for the structure, operational and procedural measures where physical measures are constrained by the existing fabric.
Retrofit blast mitigation requires a realistic assessment of what is achievable within the constraints of the existing structure, the operational environment, and the available budget. We prioritise measures that deliver the greatest risk reduction per unit of cost — ensuring that retrofit investment is allocated where it matters most.
How we work with your team
We lead the blast assessment and mitigation strategy. Your project or engineering team implements the measures. The interface between those two roles is designed to be as clear and friction-free as possible.
Blast Impact Assessment
We conduct the full threat and consequence assessment — characterising the explosive threat, establishing the design basis event, and identifying the building elements and occupancies most at risk. This is our primary technical contribution and the foundation of everything that follows.
Mitigation Specification
We specify the mitigation measures the assessment requires — structural, facade, glazing, and access point measures referenced to the applicable standards, with outline implementation guidance and indicative cost information to support the project team's planning and budget process.
Engineering Team Handover
Our assessment report and mitigation specification are structured for direct use by the project's structural engineer, facade consultant, and project manager — providing the performance requirements, the standards reference, and the design guidance they need to implement the measures within the project programme.
Review & Technical Support
We remain available through the design and construction process to answer technical queries, review structural engineer and facade consultant proposals against the mitigation specification, and confirm that the implemented measures will achieve the performance the assessment requires.
What the report includes
Executive Summary
A concise, plain-language summary for board, senior leadership, and insurance or regulatory presentation — conveying the risk picture and the mitigation response without requiring technical fluency to interpret.
Threat Assessment Summary
Documented characterisation of the credible explosive threat — charge weight scenarios, standoff distances, attack vectors — forming the design basis event against which all mitigation is referenced.
Consequence & Vulnerability Analysis
Asset-by-asset consequence grading and, for existing buildings, structural vulnerability findings — identifying where blast effects would be most significant and what level of protection each area requires.
Prioritised Mitigation Register
A structured list of mitigation measures, sequenced by priority and referenced to the applicable standards — with implementation guidance and outline cost indications for each measure.
Standards References & Implementation Notes
Full citation of the applicable standards for each mitigation measure, with notes to guide the structural engineer, facade consultant, and project manager in their implementation.
What You Receive
A single, integrated assessment and mitigation report — structured to serve the needs of the project team, the structural engineer, senior leadership, and governance processes simultaneously.
Executive Summary Report
A concise, classification-appropriate summary for board, senior leadership, and external governance — presenting the risk picture and the proportionate response without requiring technical fluency to interpret or act upon.
Blast Threat & Consequence Assessment Report
The documented threat characterisation and consequence analysis — establishing the design basis event and the consequence profile for the site. The technical foundation of the engagement and the reference document for all subsequent design decisions.
Prioritised Mitigation Register
A structured, standards-referenced register of all recommended mitigation measures — sequenced by risk priority, with implementation guidance and outline cost indications to support the project team's planning and budget process.
Structural Vulnerability Findings (brownfield)
For existing buildings: a documented assessment of how the structure would respond to the blast loading scenarios identified — identifying primary failure modes, at-risk elements, and the modifications that would most efficiently reduce vulnerability.
Standards Reference Documentation
Full citation of the applicable standards for each area of the assessment and each mitigation measure — formatted for direct use by the structural engineer, facade consultant, and project manager in implementing the recommendations.
Findings Briefing & Technical Support
A structured briefing to the project team and senior stakeholders — presenting key findings, the basis of the mitigation recommendations, and the handover to the engineering team. Followed by a defined period of technical support during design implementation.
What we discuss here, and what we discuss in private
Blast assessment methodology — the specific analytical techniques, charge weight scenarios, modelling approaches, and vulnerability assessment methods we use — is not published on this page. That is a deliberate decision.
The detailed methodology is discussed in confidence with qualified clients during the initial consultation. Engagements in this discipline are subject to strict information handling requirements, and our assessment reports are classified and distributed only in accordance with protocols agreed in advance with the client.
If you have a specific technical requirement, a regulatory or insurance obligation, or a project where blast risk has been identified as a concern, the right starting point is a confidential conversation. We will discuss your situation, outline what an engagement would involve, and confirm whether the scope of work falls within our practice — before any commitment is made on either side.
Commission a Blast Impact Assessment
Whether you are designing a new facility, reviewing an existing building's vulnerability, or responding to a regulatory or insurance requirement — a proportionate, evidence-based blast assessment provides the foundation for every decision that follows.
Initial conversations are held in confidence. We will discuss your situation, outline what an engagement would involve, and confirm scope and timeline — without obligation on either side.