What Counts as a Significant Hazard Under Awaab's Law? Categories and Timescales Explained

When a tenant reports mould, a broken window, or a leaking pipe, Awaab's Law's statutory deadlines do not apply to every report — they apply when the hazard is significant. Getting the threshold assessment right matters: misclassify a significant hazard as routine and you miss a statutory deadline; misclassify a routine report as significant and you overrun capacity on cases that did not require the full framework.

This post explains what "significant" means under the regulations, which HHSRS hazard categories are in scope at each phase, and how to handle borderline cases.

For the overall deadline framework, see The Complete Guide to Awaab's Law.

The Legal Definition: "Significant"

Awaab's Law applies when a hazard presents a "significant risk of harm to the health or safety of a tenant". The GOV.UK guidance explicitly ties the "significant" threshold to the Housing Health and Safety Rating System (HHSRS) framework from the Housing Act 2004.

In practice, the test has two components:

1. Is the hazard within the Phase that is currently in force? A loose stair rail is a Phase 2 hazard (falls). A broken boiler can be an emergency hazard and a Phase 2 cold hazard. If the hazard category is not yet in scope, Awaab's Law deadlines do not apply — but other duties under Section 11 of the Landlord and Tenant Act 1985 and HHSRS assessments still apply.

2. Would a reasonable HHSRS assessment flag the hazard at a level that presents meaningful health or safety risk? HHSRS uses Category 1 and Category 2 hazard classifications. Category 1 hazards (high severity or high likelihood) are almost certainly significant. Category 2 hazards sometimes are, depending on the specific likelihood and harm outcome scores.

The guidance does not require a formal HHSRS assessment before the clock starts — that would defeat the purpose of the statutory deadline. The standard is "a reasonable landlord in the landlord's position would consider this significant". In practice, for damp and mould reports, assume significance until investigation proves otherwise.

Phase 1: Damp, Mould, and Emergency Hazards (In Force Now)

Since 27 October 2025, two categories of hazard trigger Awaab's Law deadlines:

Emergency hazards

An emergency hazard is one where a reasonable landlord would act within 24 hours because delay would be dangerous. Examples:

• Gas leaks — smell of gas, reported by tenant or contractor
• Total heating failure in cold conditions — broken boiler in winter
• Severe electrical faults — exposed live wiring, smoke from outlets, total loss of supply
• Major structural defects — active collapse risk, ceilings coming down, severe subsidence
• Severe flooding or major leaks — not a dripping tap, but active water ingress causing damage
• Broken external doors or windows rendering the property insecure
• Mould severe enough to pose immediate respiratory risk — dense, widespread mould in a bedroom or bathroom used by vulnerable occupants

Emergency hazards are assessed on the day of report. The 24-hour clock runs on calendar hours, not working days.

Significant damp and mould

The Phase 1 significant-hazard category is damp and mould that presents meaningful health or safety risk. Practical examples:

• Visible mould growth on walls, ceilings, in bathrooms or kitchens
• Penetrating damp — staining, discoloration, wet patches on walls
• Rising damp — damp at skirting-board level with characteristic tide-marks
• Condensation damp producing mould — common in bathrooms and bedrooms with poor ventilation

Cosmetic mould spots that wipe off easily and return slowly may not meet the significance threshold, but most reported damp and mould cases will. The Housing Ombudsman's published determinations consistently find against landlords who dismiss tenant-reported damp as "cosmetic" without investigating.

Use the deadline calculator to see the full timescale chain for any specific case.

Phase 2: Expected in 2026

Phase 2 will extend the significant-hazard threshold to 13 additional HHSRS categories. According to the GOV.UK guidance, these are:

HHSRS Category Group	Specific hazards	Typical Reports That Would Qualify
Excess cold and heat	Excess cold, excess heat	Broken boiler, failed heating system, dangerous overheating in flats
Falls	Falls associated with baths, falling on level surfaces, falling on stairs, falling between levels	Loose stair rails, uneven flooring, missing grab rails, broken steps, unsafe balconies
Structural	Structural collapse and falling elements, explosions	Cracked walls, subsidence, unsafe balconies, gas leak risks
Fire and electrical	Fire, electrical hazards	Faulty wiring, missing smoke alarms, blocked fire exits, overloaded circuits
Hygiene	Domestic hygiene (pests and refuse), personal hygiene (sanitation and drainage), food safety	Severe pest infestations, blocked drains, sewage issues, non-functioning kitchens

The significance threshold for each will depend on the specifics of the case — a chipped stair edge is not a fall hazard, but a loose stair rail on a fire-escape route is. The HHSRS framework provides the assessment structure. Use the phase checker to look up specific HHSRS hazards and confirm which phase they fall into.

Phase 3: Expected in 2027

Phase 3 will complete the transition by extending Awaab's Law to all remaining HHSRS categories except crowding and space (which are addressed under separate overcrowding legislation). This will include asbestos, carbon monoxide, lead, radiation, entry by intruders, lighting, noise, water supply, flames and hot surfaces, collision and entrapment, and position/operability of amenities.

Borderline Cases: How to Decide

When a report arrives and you are not sure whether the hazard is significant, four factors to weigh:

1. The tenant's vulnerability. The same mould growth in a property occupied by an elderly tenant with respiratory conditions or a young child carries different health risk than in a property with healthy young adults. HHSRS assessments formally account for vulnerability. Treat higher-vulnerability properties with a lower significance threshold.

2. The hazard's progression. A new, minor condensation mark is different from a month-old, expanding patch. Ask the tenant how long the hazard has been present and whether it is getting worse.

3. The property's recent history. If the same property has had similar hazards before, this is not a first occurrence — it is a pattern. The Housing Ombudsman weighs pattern evidence heavily. Treat repeat hazards as significant until investigation proves otherwise.

4. The realistic consequence of misjudging. If you classify a hazard as routine and you are wrong, you miss a statutory deadline and face a potential disrepair claim plus Ombudsman exposure. If you classify it as significant and you are wrong, you incur the cost of a 10-working-day investigation that may find nothing. The asymmetric risk strongly favours classifying borderline cases as significant.

Most housing officers err on the side of caution. The operational cost of treating more reports as significant is real but manageable; the legal and regulatory cost of missing a deadline is not.

Recording Your Assessment

Regardless of how you classify the hazard, document the assessment. The case record should show:

• Date and time of awareness (channel, who recorded it, what was reported)
• Significance assessment (significant / not significant / emergency)
• Reasoning (hazard category, vulnerability factors, property history)
• Named officer who made the assessment

If the Housing Ombudsman or a disrepair claim later examines the case, the dated assessment and reasoning are your defence. "We decided it was routine" is not evidence. "We assessed the report against the HHSRS categories on 12 May, noting the tenant had no reported vulnerabilities, the mould was localised to a single 10cm patch on a kitchen wall, and the property had no prior damp history — assessed as not significant but monitored" is.

The compliance checklist walks through every case lifecycle stage including the initial significance assessment.

Practical Steps for Your Team

• Train frontline staff on the significance threshold — the officer taking the call is often making the first significance judgement implicitly. Make sure they know the test.
• Create written criteria for your organisation's application of the significance threshold, reviewed by your housing solicitor or compliance lead.
• Default to significant for reported damp and mould — the legal and regulatory exposure of under-classifying is substantially higher than the operational cost of over-classifying.
• Keep a log of borderline cases — where your team decided a hazard was not significant, record the reasoning and check whether later events (complaints, deterioration) would have changed the call.

If you want automated case tracking with built-in significance assessment and evidence capture across the full case lifecycle, join the HazardClock waitlist. We are building this specifically for providers under 5,000 units.

This is general guidance for UK social housing providers, not legal advice. HHSRS assessments and significance thresholds involve specific professional judgement — always seek competent HHSRS assessor input for borderline or high-value cases. Always confirm your approach against the latest GOV.UK guidance.

Sources

• Awaab's Law: Guidance for social landlords — Timeframes for repairs in the social rented sector — GOV.UK
• Social Housing (Regulation) Act 2023 — legislation.gov.uk
• Housing Act 2004 (HHSRS framework) — legislation.gov.uk
• Awaab's Law learning resources — Housing Ombudsman