In London construction, anchor installation is no longer just a technical activity, it is an evidential process. Under the Building Safety Act 2022 and BS 8539, the requirement is not simply to install anchors correctly, but to demonstrate that they have been selected, installed, tested and verified in accordance with the standard. This creates a critical question across projects: who is responsible for maintaining anchor records?
On many sites, responsibility is unclear. Designers assume contractors will hold records. Contractors assume testing companies will retain evidence. Testing companies assume they are only responsible for issuing reports. This fragmentation creates a gap in the Golden Thread of information required by the Building Safety Regulator (BSR), particularly for higher-risk buildings.
In practice, responsibility for anchor records is not held by a single party. It is distributed across the dutyholder chain, with specific obligations at each stage of design, installation, testing and handover. Understanding who holds what evidence and who ultimately owns the record, is essential to demonstrating compliance and avoiding liability.
How Anchor Record Responsibility Is Split Across Dutyholders
On many sites, responsibility is unclear. Designers assume contractors will hold records. Contractors assume testing companies will retain evidence. Testing companies assume they are only responsible for issuing reports. This fragmentation creates a gap in the Golden Thread of information required by the Building Safety Regulator (BSR), particularly for higher-risk buildings.
In practice, responsibility for anchor records is not held by a single party. It is distributed across the dutyholder chain, with specific obligations at each stage of design, installation, testing and handover. Understanding who holds what evidence and who ultimately owns the record, is essential to demonstrating compliance and avoiding liability.
How Anchor Record Responsibility Is Split Across Dutyholders
Under BS 8539, anchor records are not owned by a single party but form part of a distributed evidence system. Designers are responsible for specifying anchor requirements, contractors for installation records, and testing organisations for verification data.
However, under the Building Safety Act 2022, the Principal Contractor and ultimately the dutyholder responsible for the building must ensure that all anchor-related information is captured, coordinated and retained as part of the Golden Thread. The responsibility is therefore shared in production, but centralised in accountability at project and building level.
1. What Are Anchor Records Under BS 8539?
Anchor records are the documented evidence that demonstrates compliance with the standard.
This typically includes:
These records are not optional, they are required to demonstrate that anchors achieve the intended performance. Without records, compliance cannot be evidenced.
2. Designer Responsibility: Specification and Assumptions
The designer is responsible for defining:
However, designers do not control installation or testing. Their responsibility ends at design intent, unless explicitly retained under contract.
3. Contractor Responsibility: Installation Records
The installing contractor is responsible for demonstrating that anchors have been installed correctly.
This includes:
Under BS 8539, installation must be carried out by competent persons under supervision.
The contractor therefore holds:
If installation records are missing, the installation cannot be verified, even if testing passes.
4. Testing Organisation Responsibility: Verification Evidence
The testing organisation (e.g. pull-out testing provider) is responsible for:
They are responsible for the accuracy and integrity of test data, not for:
Their role is verification, not ownership of the full record.
5. Principal Contractor Responsibility: Coordination and Control
Under the Building Safety Act, the Principal Contractor has a critical role.
They must:
In practice, this means:
The Principal Contractor is the first point of integration of anchor data. If records are fragmented, the system fails at this level.
6. Client / Accountable Person Responsibility: The Golden Thread
At building level, responsibility becomes centralised.
Under the Building Safety Act, the dutyholder (Client or Accountable Person) must ensure that:
1. What Are Anchor Records Under BS 8539?
Anchor records are the documented evidence that demonstrates compliance with the standard.
This typically includes:
- Design specifications and calculations
- Anchor selection data (ETA / EAD / UKCA marking)
- Method statements and installation procedures
- Installer competence records
- Installation logs (location, embedment, torque)
- Test results (proof tests, suitability tests)
- Non-conformance reports (if failures occur)
- Sign-off and approvals
These records are not optional, they are required to demonstrate that anchors achieve the intended performance. Without records, compliance cannot be evidenced.
2. Designer Responsibility: Specification and Assumptions
The designer is responsible for defining:
- Load requirements
- Anchor type and performance criteria
- Base material assumptions
- Safety factors and design methodology
- The designer’s records typically include:
- Calculations
- Specifications
- Drawings
However, designers do not control installation or testing. Their responsibility ends at design intent, unless explicitly retained under contract.
3. Contractor Responsibility: Installation Records
The installing contractor is responsible for demonstrating that anchors have been installed correctly.
This includes:
- Recording anchor type and batch
- Installation date and location
- Hole preparation method
- Torque or setting method
- Installer identification
Under BS 8539, installation must be carried out by competent persons under supervision.
The contractor therefore holds:
- Installation logs
- Competence records
- Method statements
If installation records are missing, the installation cannot be verified, even if testing passes.
4. Testing Organisation Responsibility: Verification Evidence
The testing organisation (e.g. pull-out testing provider) is responsible for:
- Carrying out testing in accordance with BS 8539 or CFA guidance
- Recording test loads and results
- Identifying failures or anomalies
- Issuing formal reports
They are responsible for the accuracy and integrity of test data, not for:
- Installation
- Design
- Overall compliance
Their role is verification, not ownership of the full record.
5. Principal Contractor Responsibility: Coordination and Control
Under the Building Safety Act, the Principal Contractor has a critical role.
They must:
- Ensure works are carried out in compliance with regulations
- Coordinate evidence across trades
- Maintain site-level records
In practice, this means:
- Collecting installation records
- Obtaining testing reports
- Ensuring traceability
The Principal Contractor is the first point of integration of anchor data. If records are fragmented, the system fails at this level.
6. Client / Accountable Person Responsibility: The Golden Thread
At building level, responsibility becomes centralised.
Under the Building Safety Act, the dutyholder (Client or Accountable Person) must ensure that:
- Information is complete
- Information is accurate
- Information is accessible
Anchor records form part of the Golden Thread of information.
This means:
- Records must be retained beyond construction
- Records must be accessible during occupation
- Records must support future inspections and remediation
The ultimate responsibility is therefore, not who created the records, but who ensures they exist and are retained.
7. The Common Failure: No Single Owner
On many London projects, the failure is not technical, it is organisational.
Typical issues include:
- Testing reports not linked to installation logs
- No mapping of anchors to locations
- Missing competence records
- Data held by different parties with no integration
This creates a situation where:
- Testing exists, but cannot be traced
- Installation exists, but is not verified
- Design exists, but assumptions are unproven
From a regulatory perspective, this is non-compliance.
8. What This Means for London Projects in 2026
The direction of travel is clear.
The Building Safety Regulator expects:
- Full traceability
- Evidence-based compliance
- Coordinated information systems
Anchor records are no longer a subcontractor output, they are a regulated information asset.
Projects that cannot demonstrate this will face:
- Gateway delays
- Compliance challenges
- Increased liability exposure
Evidence-Based Summary
Responsibility for maintaining anchor records is not driven by a single party but by a combination of design, installation, verification and regulatory duties defined under BS 8539 and the Building Safety Act 2022. While designers, contractors and testing organisations each produce specific elements of anchor evidence, the Principal Contractor must coordinate this information during construction, and the dutyholder must retain it as part of the Golden Thread.
Evidence shows that failures in anchor compliance are typically caused by fragmented record-keeping rather than technical defects. In practical terms, projects must treat anchor data as a structured, traceable system with clear ownership at both project and building level.
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Expert Verification & Authorship: Mihai Chelmus
Founder, London Construction Magazine | Construction Testing & Investigation Specialist |
