Building Safety Golden Thread Auditor
Get Started with This SkillOverview
The Building Safety Golden Thread Auditor skill helps Rakenne users draft and audit Safety Case Reports for Higher-Risk Buildings (HRBs) under the UK Building Safety Act 2022. It covers the full workflow: determining HRB status, populating all mandatory sections per BSR guidance, validating external wall system specifications against the combustible materials ban (SI 2018/1230), and checking for required fire test evidence (BS 8414 / BR 135). The skill includes a validation tool for cladding compliance, a complete Safety Case Report template, a golden thread compliance checklist, and reference documents covering BSA 2022 obligations and report structure. Applicable to all Higher-Risk Buildings in England — residential buildings at least 18 m or 7 storeys with 2 or more residential units.
Getting Started
Upload your building information, fire risk assessments, EWS specifications, or existing Safety Case Report to the project workspace, then activate the Building Safety Golden Thread Auditor skill. The agent will guide you through the process: confirming HRB status, populating the template with building data, documenting fire safety strategy and external wall system details, running the cladding compliance checker, and validating the completed report against the golden thread checklist. The result is a BSR-ready Safety Case Report with all mandatory sections.
Example Conversation
Below is an example of how a typical session might unfold when drafting a Safety Case Report for a residential tower undergoing cladding remediation.
You: We manage a 24-storey residential tower in Manchester — 72 m tall, 196 flats. The building has ACM cladding with a PE core that’s being replaced under the Building Safety Fund. Remediation started in January 2026 and is expected to complete by December 2026. We currently have a waking watch and simultaneous evacuation in place. Please draft the Safety Case Report.
Agent: I’ll confirm the building’s status: at 72 m and 24 storeys with 196 residential units, this is a Higher-Risk Building under BSA 2022. Let me set up the Safety Case Report template and begin populating it.
For the external wall system, I’ll run the cladding_remediation_checker against your specification:
- BANNED MATERIAL DETECTED: ACM with PE core — banned on buildings over 18 m (SI 2018/1230)
- MISSING: BS 8414 / BR 135 test evidence for the replacement system
- MISSING: Euroclass certificates for replacement materials
The checker flagged 2 errors and 1 warning. I’ll draft Section 5 (External Wall System) documenting the current non-compliant ACM, the remediation scope and programme, and the interim safety measures (waking watch, simultaneous evacuation). I’ll add placeholders for the replacement system’s Euroclass certificates and BS 8414 test report — please provide these when available.
I’ve completed the remaining sections using the information provided. Let me run through the golden thread checklist to confirm completeness before you review.
You: The replacement system uses Rockpanel A2-s1,d0 rain-screen with mineral wool insulation (Euroclass A1). We have the BS 8414 test report ref: BRE-GT-2025-1847.
Document Excerpt
Below is a representative excerpt from a Safety Case Report produced with this skill.
Safety Case Report — Excerpt
Castlefield Tower, 15 Wharf Road, Manchester, M15 4QT HRB Registration No.: HRB-2024-00847
5.1 External Wall System — Current Configuration
| Component | Material | Euroclass Rating | Status |
|---|---|---|---|
| Rain-screen cladding | ACM with PE core | E (combustible) | Non-compliant — remediation in progress |
| Insulation | PIR foam board (75 mm) | E (combustible) | Non-compliant — scheduled for replacement |
| Cavity barriers | Intumescent strip (original) | — | Under inspection |
| Fixings / brackets | Aluminium L-brackets | A1 | Compliant |
Compliance status: Does NOT meet the combustible materials ban (SI 2018/1230 reg. 7). Full remediation in progress.
5.3 Remediation Programme
| Field | Detail |
|---|---|
| Remediation scope | Full recladding — all four elevations (approx. 8,400 m²) |
| Replacement rain-screen | Rockpanel Natural A2-s1,d0 |
| Replacement insulation | Mineral wool slab (100 mm), Euroclass A1 |
| New cavity barriers | Siderise open-state cavity barriers at every floor and compartment line |
| BS 8414 / BR 135 evidence | BRE test report ref: BRE-GT-2025-1847 (classification: meets BR 135 criteria) |
| Programme start | January 2026 |
| Expected completion | December 2026 |
| Current status | On-site — north and east elevations completed |
| Funding | Building Safety Fund (DLUHC grant ref: BSF-2024-MC-0392) |
5.4 Interim Safety Measures
| Measure | Detail |
|---|---|
| Waking watch | Trigion Fire & Security — 24/7 coverage, 15-min patrol cycle |
| Alarm system | Simultaneous evacuation alarm installed (April 2024) |
| Evacuation strategy | Changed from stay-put to simultaneous evacuation (April 2024) |
| Additional mitigations | Weekly dry riser test, bin store locked overnight, fire marshal on each floor during works |
This excerpt is illustrative. The final content must reflect the specific building data, current remediation status, and applicable regulatory requirements.
Validation by the Extension Tool
The skill includes one extension tool that automates external wall system compliance checking.
cladding_remediation_checker
Cross-references a building’s EWS specification or Safety Case Report against BSA 2022 / SI 2018/1230 requirements.
| Check | Description |
|---|---|
| Banned materials | Detects ACM (PE core), HPL, EPS, XPS, phenolic foam, MCM (combustible core), and timber cladding. Severity escalates to ERROR for Higher-Risk Buildings. |
| Test evidence | Checks for references to BS 8414 large-scale fire test, BR 135 classification, Euroclass A1/A2-s1,d0 certificates, FRAEW, and EWS1 form. |
| Required sections | Verifies presence of building registration, EWS description, material schedule, cavity barriers, remediation scope, interim measures, test evidence, and Accountable Person identification. |
| Placeholders | Detects unfilled template markers (square brackets, ellipses) in the document. |
cladding_remediation_checker path="safety_case_report.md" building_height_m=72 num_storeys=24
Interpreting Results
- ERRORS indicate mandatory compliance gaps — banned materials present, missing test evidence for a Higher-Risk Building, or absent required sections. These must be resolved before BSR submission.
- WARNINGS flag items that need review — potentially restricted materials in buildings under 18 m, or unfilled placeholders that may indicate incomplete drafting.
- The tool does not replace a qualified Fire Risk Assessor or Fire Engineer — it serves as a structured quality assurance check during Safety Case Report preparation.