BS 9792:2025 working guide
BS 9792:2025 replaced PAS 79-2 as the recognised housing FRA methodology in early 2025. This is a working guide to the standard for practising assessors, competent reviewers, in-house compliance teams, and the software they use. Scope, methodology, evidence, competence, periodic review, transition from PAS 79.
Scope
BS 9792:2025 is housing-specific. It applies to the common parts of purpose-built blocks of flats, converted buildings containing residential premises, houses in multiple occupation (HMOs), sheltered and supported housing, and other multi-occupied residential settings where a duty to assess fire risk exists. The standard deliberately leaves the inside of individual private dwellings out of scope unless the dutyholder has reason to enter, mirroring the FSO's position on the common parts.
For non-housing premises (offices, retail, industrial, education, healthcare, hospitality), the relevant code is BS 9792-1, which is the rebrand of PAS 79-1:2020. The two parts share a common methodology backbone but the scope, terminology, and worked examples are different. Trying to use the housing standard for a hotel, or the general standard for a block of flats, will produce a report that fails competent review.
The standard sits alongside other technical references but does a different job. Approved Document B is design guidance under the Building Regulations 2010. BS 9991 is the residential fire safety design code. BS 5839-6 is the domestic fire detection code. BS 9792 is the methodology for assessing whether the existing fire safety arrangements meet the FSO duty, not what the building should have been built to in the first place.
Migration from PAS 79
PAS 79-2:2020 was a publicly available specification, a faster, lighter document than a full British Standard, produced as part of the post-Grenfell response to give the housing sector a recognised housing-specific FRA reference. BS 9792:2025 takes the same housing focus and lifts it into a full BS, with the consultation, technical committee work, and revision cycle that comes with that. The methodology is not unrecognisable to a PAS 79 reader, but the surface differences are real.
Methodology
BS 9792:2025 keeps the broad methodology that PAS 79 readers will recognise. Identify hazards. Identify people at risk. Evaluate the risk. Record significant findings. Plan an action plan. Review periodically. The shape of the output report follows: building description, fire safety arrangements, observations against each section of the building, significant findings, recommended actions, and a competence-and-sign-off block.
The competent assessor is doing more than describing the building. At each stage they are exercising judgement against the methodology, deciding which hazards are significant in this specific setting, which residents are at heightened risk, and what residual risk remains after the existing fire safety arrangements are taken into account. The competent reviewer is checking that judgement, not the facts of the building alone.
Type, height, construction, occupancy, fire strategy, escape route arrangements, compartmentation, fire detection and alarm coverage, and any known limitations to the assessment.
Sources of ignition, sources of fuel, sources of oxygen, and any structural or behavioural factors that increase risk in this specific building.
Residents, visitors, contractors and emergency responders, with explicit attention to vulnerable residents who may need a Personal Emergency Evacuation Plan or equivalent housing arrangement.
Assessor judgement of the residual risk for each significant finding, recorded with reasoning rather than only a colour or score.
Each finding linked to its evidence, given a priority, and turned into a recommended action with a target close-out timeframe the dutyholder can act on.
A named competent person reviews the report against the methodology and signs off. Both signatures and the date of next review are recorded.
Evidence model
Under PAS 79-era practice, the connection between an observation on site and a finding in the report was often implicit. The assessor saw something, formed a view, and wrote it up. The evidence trail might be a folder of photos somewhere with filenames that nobody remembered six months later when a landlord queried a finding.
BS 9792:2025 expects more. Every significant finding should be traceable to the observation, location, and evidence that justifies it. In practice that means each high-priority issue in the report should answer three questions on demand: where was this seen, what did the assessor see, and what evidence (photo, drawing, document, third-party reference) supports the rating that has been given.
For competent reviewers this is the difference between a quick procedural check and a meaningful technical review. The reviewer with traceable evidence can verify the finding by clicking through to its source. The reviewer without traceable evidence is reading prose and trusting the assessor by default. For software, this is the design constraint: a report writer that lets you produce narrative findings without keeping the underlying observation and evidence linked is a tool that fails the standard's implicit data model.
Evidence-linked AI drafting is one practical implementation of this. When the AI generates narrative findings from tagged observations, photos, and risk scores, every drafted line carries a footnote-style link back to its source. The reviewer trusts the AI draft because they can audit it in a click, not because they cross their fingers and read the prose.
Competence
BS 9792:2025 expects the assessment to be carried out by a person competent in housing fire risk assessment. Competence here means a combination of training, qualification, experience in the relevant building type, and continuing professional development, assessed in the round, not by ticking a single qualification box.
PAS 7:2024 sets the recognised competence framework for fire risk assessors in the UK. BS 9792 references it for context. Competence is judged against the framework: what training the assessor has had, what assessments they have already done in similar building types, what professional body membership they hold, and what CPD they maintain. For an assessor newly moving into housing FRAs from a different sector, the question is whether their existing competence transfers; for a senior housing assessor with years of experience, the question is whether they continue to demonstrate currency.
For peer-reviewed work, BS 9792 is clear that the reviewer should also be competent, generally at least as experienced as the lead assessor, and should review against the methodology rather than only spell-checking the narrative. This is the discipline a serious housing FRA programme treats as non-negotiable. Software that supports it (a structured reviewer queue, exception-led surfacing, sign-off discipline with audit trail) operationalises what the standard expects.
Periodic review
BS 9792:2025 keeps the established two-track review model. There is a periodic review on a defined cycle, set against the building risk profile rather than a single calendar interval. For higher-risk residential buildings, the typical interval is annual. For lower-risk settings, longer cycles can be appropriate. The standard expects the cycle to be set with reasoning, not lifted from a default.
Alongside the periodic review, there is a significant-change trigger. Where the building, its occupancy, its use, or its fire safety arrangements change in a way that materially affects risk, the FRA needs revisiting before the next periodic cycle would otherwise fall due. The standard expects the assessor to use judgement on what counts as significant, not to wait for an exhaustive list to tell them.
Common significant-change triggers in housing include compartmentation works, replacement of cladding or fire doors, change of occupancy profile (for example, supported housing converting to general needs, or vice versa), new fire safety equipment or removal of existing equipment, and post-incident reviews after any actual fire event. Where the dutyholder has commissioned a separate compartmentation survey or external wall investigation that returns adverse findings, that itself can be a significant-change trigger.
Higher-risk buildings
For higher-risk residential buildings (residential buildings of at least 18 metres or seven storeys with two or more residential units in England), the Building Safety Act 2022 imposes an additional regulatory layer on top of the FSO duty. The Principal Accountable Person (PAP) is the lead duty-holder. The Building Safety Regulator is the regulator. The building safety case is a structured argument the PAP maintains.
The FRA on an HRB is one of the documents the safety case rests on. It is not the safety case itself; the safety case sits at a higher level and is typically managed in a separate safety case management system. But the FRA is one of the inputs the BSR can ask to see, and one of the documents the safety case argument relies on. The audit grade the FRA needs to meet on an HRB is correspondingly higher than on a non-HRB block.
For a housing FRA programme that includes HRB stock, the practical implication is that the FRA workflow needs to operate at safety case-grade for those buildings: observations linked to specific locations, significant findings carrying their evidence, reviewer sign-off not optional, content hashes and timestamps on issued reports. BS 9792 supports this; software that respects the standard's evidence model operationalises it.
Resident engagement
For HRBs, the BSA 2022 requires the PAP to operate a resident engagement process and a complaints system that allows residents to raise building safety concerns. Many of those concerns will be fire safety related: storage in escape routes, propped-open fire doors, faulty fire safety equipment, vulnerable resident evacuation arrangements. They feed back into the next FRA review cycle.
For non-HRB residential stock, the resident engagement layer is less formalised but still operationally important. A pragmatic FRA programme captures resident-raised fire safety concerns alongside assessor-observed findings, with the trail back to the original concern recorded. This matters both for the audit trail and for demonstrating active risk management to landlord clients, the Regulator of Social Housing (for social housing), and any future enforcement enquiry.
Software implications
BS 9792:2025 raises the bar on what FRA software should do. A tool built around generic compliance forms, with PAS 79-shaped templates and a Word-style report output, can produce work that complies with the FSO duty but increasingly looks behind the standard. A tool built around BS 9792 specifically (with the data model, the evidence linkage, and the reviewer discipline baked in) operationalises what the standard expects rather than retrofitting it.
FRA Flow is one example of this approach. The data model uses BS 9792 sections as primitives. The capture flow attaches observations to the right section as the assessor records them. The AI drafting works from structured evidence and produces narrative findings that trace back to source. The reviewer queue is exception-led and competent-person-aware. The output report is a BS 9792-shaped PDF with the audit trail attached.
The right way to evaluate any FRA software product against BS 9792 is to run a real assessment in it end to end and check the output against the standard. The methodology is the test, not the feature checklist.
FAQ
BS 9792:2025 is not law in itself. The legal duty to carry out a fire risk assessment comes from the Fire Safety Order 2005 and, for HRBs, the Building Safety Act 2022. BS 9792 is the recognised methodology a competent assessor uses to discharge that duty. In practice, that makes it the operating reference housing landlord clients, insurers, and tribunals expect to see.
Yes. PAS 79-2:2020 (housing) and PAS 79-1:2020 (general buildings) were both superseded by BS 9792:2025. The PAS documents have been withdrawn by BSI. New FRAs going forward should be conducted under BS 9792; older PAS 79 reports remain valid until their next periodic review, at which point the new assessment is conducted under BS 9792.
The methodology is broadly recognisable but the surface differences are real: sharper housing scoping, an explicit evidence model, tighter wording on competence, sharper guidance on periodic review and significant change. The output report shape is more explicitly defined. For a working assessor, the practical effect is a slightly more disciplined assessment with stronger evidence linkage. See the PAS 79 vs BS 9792 transition guide for the detail.
PAS 79 has been withdrawn, so the right answer is to provide a BS 9792-shaped report and explain the standards transition. Most housing landlords are aware of the change; some may not yet have updated their internal documentation. The PAS 79 reference page covers the transition position briefly, and a reasonable assessor will educate their landlord client where necessary.
The standard expects the periodic review interval to be set against the building risk profile rather than a single calendar default. Higher-risk residential buildings typically run annual reviews; lower-risk settings can be longer. Significant change to the building, its occupancy, or its fire safety arrangements triggers an out-of-cycle review regardless of when the next periodic review would otherwise fall due.
FRA Flow is built around BS 9792:2025 from the data model up. The capture flow, report skeleton, evidence model, and reviewer discipline all reflect the current standard rather than carrying it as one of many template options. See the BS 9792 software page for the workflow detail and the core software page for the broader product.
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