A request for a certified pull-out test is common on London construction projects. What is much less common is a clear explanation of what test is actually required, who has specified it and what regulatory requirement it is intended to satisfy.
There is no universal London rule requiring every safety-critical post-installed fixing to undergo physical pull-out testing. Building Control is concerned with whether the finished work demonstrates compliance with the Building Regulations. Depending on the fixing, substrate, design information and installation records, physical site testing may form part of that evidence, but it is not automatically the only route.
The technical distinction matters. Proof testing is principally used to verify installation quality of anchors intended to remain in service. Testing used to establish resistance in an unknown or inadequately characterised base material has a different purpose and requires a different test regime.
The key message: Building Control may require convincing evidence that a safety-critical fixing is suitable, correctly designed and properly installed. That does not mean there is a blanket legal requirement for a certified pull-out test. The responsible designer should establish what evidence is required and, where site testing is necessary, specify the correct test objective and load.

Is Certified Pull-Out Testing a Legal Requirement in London?

Not as a blanket requirement. London projects operate within the building-control framework applicable in England. There is not a separate London-wide statutory rule stating that every safety-critical post-installed anchor must be physically pull-tested before Building Control can accept the work.
Likewise, the expression certified pull-out testing is widely used commercially, but it is not a precise statutory test classification. The underlying requirement is broader: the design and construction must provide adequate evidence that the building work satisfies the applicable functional requirements of the Building Regulations.
Building Control is normally interested in evidence of compliance, not in forcing one particular testing method where structural adequacy and installation quality are already properly demonstrated.

What Does Building Control Actually Want to See?

For a safety-critical fixing, the compliance chain may include several different forms of evidence.
Evidence What It Demonstrates
Structural calculations The applied actions, anchor arrangement and required resistance have been considered by the designer.
ETA / appropriate product assessment The anchor has assessed performance for defined substrates, installation conditions and failure modes.
Verified substrate information The base material used in design corresponds sufficiently with the actual structure.
Installation records Drilling, cleaning, embedment, setting and torque requirements were followed.
Installer competence Installation was undertaken by personnel with appropriate knowledge and training.
Site-test report Provides additional physical evidence where proof or preliminary/suitability testing was specified.
If these records provide a coherent engineering justification, site testing may add little useful information. Where key parts of the chain are missing, however, physical testing can become an important means of resolving uncertainty.

Building Control Request vs Engineering Test Specification

One of the most important distinctions is between a regulator asking for additional evidence and an engineer defining the technical test itself.
Building Control / Regulator Responsible Designer / Engineer
Reviews whether sufficient evidence of compliance has been provided. Determines the structural actions and required anchor resistance.
May question missing or inadequate evidence. Selects the fixing and verifies the product data apply to the intended substrate and geometry.
May request additional substantiation where compliance is unclear. Determines whether site testing is technically required.
Does not normally design the anchor connection. Defines the test objective, locations, sample strategy and test load where testing is required.
Building Control wants pull tests is not, by itself, a complete technical specification. Before testing starts, the responsible project team should establish what uncertainty the test is intended to resolve and provide the test parameters accordingly.

What Makes a Fixing Safety-Critical?

A fixing becomes safety-critical because of the consequence of failure, not simply because the anchor is large or heavily loaded. Examples can include fixings supporting:
  • structural steelwork;
  • balustrades and guarding;
  • façade support systems;
  • masonry restraint systems;
  • heavy overhead services;
  • mechanical plant;
  • access systems;
  • secondary steelwork;
  • components above occupied spaces;
  • systems where failure could compromise escape or life safety.
A relatively small fixing can therefore be safety-critical if failure could result in a person falling, a heavy component detaching or a structural system losing necessary restraint. Conversely, describing an application as safety-critical does not automatically mean every installed anchor must be site tested. The verification strategy still depends on design information, product assessment, substrate certainty, redundancy and installation control.

Safety-Critical Does Not Mean “Test Everything”

Condition Possible Verification Route
Known concrete + appropriate assessed anchor + complete design + controlled installation Design and QA documentation may provide the principal evidence; project-specific proof testing may or may not be specified.
Unknown or variable masonry Site testing may be needed to establish appropriate resistance for the actual substrate.
Safety-critical installation with weak installation records Proof testing may be specified to provide additional evidence of installation quality.
Existing unidentified anchors proposed for reuse Engineering investigation and targeted testing may be required because the original design and installation history are uncertain.

When Does Site Testing Become Appropriate?

Testing becomes most valuable where it closes a genuine evidence gap. Common triggers include:
  • unknown or variable masonry;
  • existing concrete for which the relevant substrate properties are uncertain;
  • an anchor whose assessed scope does not cover the actual base material;
  • significant uncertainty over installation quality;
  • missing installation QA records;
  • existing fixings with no reliable installation history;
  • critical applications where the project specification requires proof testing;
  • previous failed tests or observed anchor movement;
  • retrospective verification of an installation that departed from the approved design.
The correct test depends on which of those uncertainties exists.

Proof Testing Is Not the Same as Testing for Allowable Resistance

BS 8539 distinguishes between different purposes of site testing. Mixing them together under the phrase pull-out testing can lead to technically incorrect specifications.
Test Type Primary Purpose Typical Anchor
Proof testing Provides evidence relating to installation quality of installed anchors. Working anchor intended to remain in service.
Preliminary / suitability testing Establishes performance where the actual substrate is not adequately represented by available design data. Normally purpose-installed test or sacrificial anchors.
Ultimate testing Explores failure resistance and failure mode as part of an appropriate test programme. Sacrificial test anchors rather than working fixings.
STRUCTinspect examines this distinction in more detail in The Engineer’s Guide to BS 8539: Proof Testing vs. Allowable Load Verification.

Proof Testing: What Is It Actually Checking?

A proof test applies a specified tensile load to an installed anchor without intentionally loading the fixing to ultimate failure. Its principal value is as an installation-quality check. A correctly specified proof-testing programme can help identify issues such as:
  • inadequate embedment;
  • poor hole cleaning;
  • incorrect installation;
  • local substrate defects;
  • unexpected anchor movement;
  • systematic workmanship problems.
A successful proof test does not create a new design resistance for the anchor. It shows how the particular tested anchor behaved under the specified proof load and test conditions.
A proof test should not be converted into an improvised anchor-design exercise. The design resistance should come from the appropriate design route; proof testing checks installation quality against a defined test requirement.

Testing in Unknown Masonry or Existing Structures

The position becomes very different when an anchor is being installed into a base material that is not adequately covered by the product's available resistance data. This is common on refurbishment projects involving:
  • old London stock brickwork;
  • variable historic masonry;
  • unknown blockwork;
  • existing concrete whose condition is uncertain;
  • mixed or repaired substrates;
  • structures where the actual base material differs from the assumed specification.
Here the engineering question is not merely was the anchor installed correctly? It may instead be what resistance can this fixing develop in this actual substrate? That requires an appropriately designed preliminary or suitability test programme rather than simply applying an arbitrary proof load to working anchors.

Why Pull-Out Test Is Technically Imprecise

The phrase pull-out test is convenient site language, but it does not properly define the engineering objective. A tensile anchor test may result in several possible behaviours or failure modes, including:
  • anchor pull-out;
  • concrete cone failure;
  • steel failure;
  • splitting;
  • bond failure;
  • masonry breakout;
  • local substrate crushing or deformation.
Pull-out is therefore also the name of one possible failure mode. Calling every tensile anchor test a pull-out test can obscure whether the engineer actually wants proof testing, suitability testing or ultimate testing.

What Does Certified Pull-Out Testing Actually Mean?

In practice, the phrase normally means that the client wants a traceable test carried out by a competent person using appropriately calibrated equipment, followed by a formal report.
It should not automatically be interpreted as meaning:
  • the anchor installation has been structurally certified by the tester;
  • the testing organisation must belong to one particular trade association;
  • the testing organisation must automatically hold UKAS accreditation for the site test;
  • the test result establishes a new safe working load;
  • the test report replaces structural engineering acceptance.

Competence, Calibration and Accreditation Are Different Things

Term What It Relates To
Competent tester Knowledge, training and practical ability to perform the specified anchor test correctly.
Equipment calibration Evidence that the load-measuring equipment is providing suitably traceable and accurate readings.
Industry certification / membership May provide a recognised competence route or be specified contractually, but should not be confused automatically with a statutory requirement.
UKAS-accredited testing A separate accreditation concept that may be required by a particular specification but is not synonymous with every routine BS 8539 site test.
A calibration certificate verifies the measuring equipment. It does not certify that the installed anchor is structurally adequate.

Who Should Decide the Anchor Test Load?

The test load should come from the responsible project designer or specifier with the necessary design information. The testing technician should not arrive on site, look at an anchor and independently decide what structural load it ought to withstand.
Party Typical Responsibility
Responsible designer / structural engineer Defines actions, selects/designs anchor arrangement, determines verification route, specifies test objective and loads, and assesses results.
Anchor manufacturer Provides assessed product information, installation instructions and technical data within the stated scope.
Installer / contractor Installs the anchors in accordance with the approved design and product instructions and records relevant QA information.
Competent tester Executes the specified test correctly and records factual load, movement and observations.
Building Control / BSR Reviews the evidence provided to demonstrate regulatory compliance.

Should the Tester Write Pass or Fail?

A well-structured site report should record what happened during the test rather than pretending that the testing contractor has undertaken the structural design assessment.
For example:
Preferred factual wording:

Anchor A12 was loaded in tension to the specified test load of 10.0kN. The specified load was achieved and maintained in accordance with the agreed testing procedure. No visible substrate cracking or anchor displacement was observed during the test.

Structural acceptance of the result remains with the responsible engineer/specifier.
This is materially different from stating that the testing organisation has certified the anchor safe for 10kN.

Higher-Risk Buildings and the Building Safety Regulator

For higher-risk building work where the Building Safety Regulator acts as the building control authority, the importance of design traceability and controlled changes becomes much greater. That does not create a universal requirement to pull-test every anchor.
Instead, safety-critical fixings should form part of a coherent evidence trail showing:
  • what connection was designed;
  • what loads were considered;
  • what anchor system was selected;
  • which assessment/design data support that selection;
  • what substrate was assumed;
  • how installation was controlled;
  • how deviations or changes were managed;
  • what inspection or testing was undertaken where required;
  • who reviewed and accepted the completed installation.
Where that evidence trail is incomplete, additional investigation or testing may become necessary to resolve the gap. But the physical test should still be selected because it answers a specific engineering question, not simply because the project falls within the higher-risk building regime.

Gateway 2 Does Not Automatically Mean Pull Testing

At the design stage, the important issue is that safety-critical connections are sufficiently developed and justified rather than being left as an unresolved site decision. An anchor connection supported by appropriate calculations, product assessment and a clear installation/verification specification may not need additional physical testing merely because the project is subject to the higher-risk building control process. If the substrate is unknown or the intended anchor falls outside the assessed design scope, however, the design team may need site investigation or preliminary testing before the fixing design can be finalised.

Gateway 3 and the Installation Record

At completion, the evidence shifts from what was designed to what was actually built. Useful records for safety-critical fixings may include:
  • approved anchor schedule;
  • final product reference;
  • installation locations;
  • installer competence records;
  • installation QA records;
  • hole-cleaning and setting information where relevant;
  • torque records where relevant;
  • approved changes;
  • site test reports where testing formed part of the verification strategy;
  • engineering acceptance of anomalies or test results.

Building Control Evidence Checklist for Safety-Critical Fixings

Design
✓ Identify the structural action carried by the connection.
✓ Record the anchor type, diameter and arrangement.
✓ Provide the appropriate design calculations.
✓ Confirm that the relevant ETA / product assessment covers the intended use.
✓ Verify spacing, edge distances and substrate assumptions.

Installation
✓ Maintain installer competence records where required.
✓ Follow manufacturer drilling and hole-cleaning requirements.
✓ Record embedment and installation configuration where necessary.
✓ Record torque or setting information where relevant.
✓ Record departures from the approved design.

Testing, where specified
✓ State whether the test is proof, preliminary/suitability or another defined test.
✓ Provide the test load in writing.
✓ Define the test locations and sampling strategy.
✓ Use competent personnel and appropriately calibrated equipment.
✓ Record loads, movement and observations factually.
✓ Obtain engineering assessment of results and failures.

What Should an Anchor Test Report Contain?

A useful test report should make the test reproducible and auditable.
Information Reason
Project, date and exact test location Identifies where and when the test occurred.
Anchor specification Links the test to the installed fixing.
Base material Provides essential context for interpreting behaviour.
Purpose/type of test Distinguishes proof testing from preliminary/suitability testing.
Specified test load Shows the load supplied by the responsible specification.
Equipment identification and calibration Provides traceability of force measurement.
Applied load and movement Records the actual behaviour observed.
Failure or abnormal behaviour Records slip, cracking, breakout or other relevant observations.
Tester identity Supports competence and traceability.

Typical London Project Scenarios

Scenario Likely Engineering Issue Possible Verification Route
New concrete + appropriately assessed anchor + complete design Main residual uncertainty may be installation quality. Design/QA records may be sufficient; proof testing only where specified or justified.
Existing old concrete with uncertain properties Base material may not match design assumptions. Investigation and appropriately designed preliminary/suitability testing may be required.
Old London stock brickwork Brick and mortar condition can vary significantly. Site-specific testing may be appropriate where product data do not adequately characterise the substrate.
Balustrade anchors near a slab edge High consequence of failure plus potentially sensitive edge geometry. ETA-based design, reinforcement/edge verification and project-specific proof testing where specified.
Overhead heavy services Failure could create a falling-object hazard. Controlled design and installation with proof testing where required by the specification or QA strategy.
Existing unidentified anchors being reused Product, embedment, age and installation history are unknown. Engineering investigation and a project-specific physical verification strategy.
Installer QA records missing Design may be sound but execution cannot be fully demonstrated. Proof testing may provide additional evidence, with extent determined by the responsible engineer.
Product assessment does not cover actual masonry Published resistance cannot simply be assumed. Preliminary/suitability testing and engineering derivation of appropriate resistance.

Does This Fixing Need Site Testing?

Question 1: Is the fixing safety-critical?
If no, normal design and installation QA may be sufficient. If yes, continue.
Question 2: Is there appropriate assessed performance data for the exact anchor, substrate and application?
If no, site-specific preliminary/suitability testing may be required.
Question 3: Is the actual substrate known and consistent with the design assumptions?
If no, further investigation or site testing may be needed.
Question 4: Is the installation fully traceable and adequately controlled?
If no, proof testing may be justified as additional evidence of installation quality.
Question 5: Has the responsible engineer defined the test objective and load?
If no, testing should not proceed merely on the basis of a generic request for a “pull test”.

What Happens If a Proof-Test Anchor Fails?

A failed sampled proof test should not simply be replaced and forgotten.
The failure raises an engineering question: was it an isolated defect, a local substrate problem or evidence of a wider installation issue?
A sensible response includes:
  • recording the exact anchor location;
  • recording load, movement and failure behaviour;
  • notifying the responsible engineer/specifier;
  • checking installation records;
  • investigating hole depth, cleaning, embedment and substrate condition where relevant;
  • expanding the test sample in accordance with the applicable test regime;
  • reviewing whether similar anchors within the same installation area may be affected;
  • agreeing remediation before accepting the installation.
The purpose of escalation is not simply to generate more test certificates. It is to determine whether the failure represents a wider defect in the installation or substrate.

Reaction Bridge Position Matters

Anchor testing equipment does not merely measure force; it also reacts that force back into the surrounding substrate. If the reaction bridge or support feet are positioned too close to the anchor during a test intended to investigate substrate failure, the equipment can restrain the potential breakout zone and artificially influence the result. Test geometry therefore needs to suit the objective of the test, particularly where ultimate or preliminary testing is being used to investigate substrate-controlled failure.

Working Anchors Should Not Be Tested to Ultimate Failure

A working anchor intended to remain in service should not normally be loaded deliberately until failure merely to demonstrate its capacity. Where ultimate behaviour needs to be established, testing should generally use purpose-installed or sacrificial anchors in representative substrate locations under a properly defined test programme. Proof testing, by contrast, is intended to remain non-destructive to the working fixing and surrounding structure when correctly specified and executed.

Ten Common Safety-Critical Anchor Testing Mistakes

1. Assuming Building Control requires every anchor to be tested.
The compliance question is broader than physical testing alone.
2. Calling every tensile test a pull-out test.
Proof, suitability and ultimate tests have different objectives.
3. Asking the tester to choose the structural test load.
The responsible designer/specifier should provide the required load and test objective.
4. Using proof testing to derive an allowable resistance.
Proof testing verifies installation quality; it is not automatically a resistance-determination procedure.
5. Testing working anchors to failure.
Ultimate testing should normally use sacrificial anchors.
6. Ignoring the reaction bridge geometry.
Incorrect reaction positioning can influence substrate behaviour and invalidate the engineering interpretation.
7. Treating calibration as structural certification.
Calibration verifies the measuring equipment, not the anchor design.
8. Ignoring anchor movement because the target load was reached.
Unexpected slip or substrate cracking can be important even if the load cell reaches the nominal test value.
9. Treating one successful sample as proof of the entire installation.
Sampling only provides meaningful evidence when selected and interpreted within an appropriate test regime.
10. Issuing a test certificate that claims structural safety.
The tester should report factual results; engineering acceptance remains with the responsible designer.

Safety-Critical Fixing Verification Checklist

Before installation
✓ Identify whether failure has a safety-critical consequence.
✓ Confirm structural actions and anchor arrangement.
✓ Check product assessment against the actual application.
✓ Verify base-material assumptions.
✓ Define whether site testing is required.

Before testing
✓ Confirm the objective of the test.
✓ Confirm whether anchors are working or sacrificial.
✓ Obtain the specified test load in writing.
✓ Confirm the required sample and locations.
✓ Check test equipment calibration.
✓ Confirm reaction arrangement is appropriate.

During and after testing
✓ Record applied loads factually.
✓ Record movement, slip and substrate cracking.
✓ Record failure modes where applicable.
✓ Escalate failed samples for engineering review.
✓ Keep testing reports with the anchor design and installation records.
✓ Obtain acceptance from the responsible designer/specifier.

Ten Rules for Safety-Critical Fixing Verification

1. There is no universal London rule requiring every safety-critical anchor to be pull-tested.
2. Start with the structural design and product assessment before specifying testing.
3. Treat unknown substrates as an engineering uncertainty requiring investigation.
4. Do not confuse proof testing with resistance determination.
5. The responsible engineer/specifier should define the test load.
6. Use competent testers and suitably calibrated equipment.
7. Protect working anchors from destructive testing.
8. Treat abnormal movement as evidence even if the target load is reached.
9. Expand and investigate a test programme when failures occur.
10. Keep the tester's factual report separate from the engineer's structural acceptance.

Evidence-Based Summary

There is no universal Building Regulation requiring every safety-critical fixing in London to undergo a certified pull-out test.
Building Control is concerned with whether sufficient evidence exists to demonstrate regulatory compliance.
A valid product assessment, appropriate structural calculations, known substrate and controlled installation can provide substantial evidence without automatically requiring physical testing.
Where the substrate is unknown or inadequately covered by available design data, site testing may be needed to establish appropriate anchor resistance.
Proof testing serves a different purpose: it provides evidence relating to the quality of installation of working anchors.
The term pull-out test is imprecise and should not replace a defined test objective.
Certified pull-out testing is commonly used commercial language rather than a single statutory testing category.
Tester competence, equipment calibration and organisational accreditation are separate concepts.
The responsible designer/specifier should determine the test objective, load and acceptance criteria.
The competent tester should apply the specified load and report factual observations including movement and failure behaviour.
Higher-risk building requirements increase the importance of traceability and the evidence trail but do not automatically create a requirement to physically test every anchor.
The appropriate verification route depends on consequence of failure, design evidence, substrate certainty, installation QA and the specific uncertainty that needs to be resolved.

FAQ: Building Control and Anchor Pull-Out Testing

Does London Building Control require every structural anchor to be pull tested?
No universal London-wide rule requires physical testing of every structural or safety-critical anchor. The project must provide adequate evidence that the connection satisfies the applicable Building Regulations.
Is certified pull-out testing a legal term?
No. It is commonly used industry terminology. A proper technical specification should identify the actual test required, such as proof testing or preliminary/suitability testing.
Can Building Control ask for anchor testing?
Building Control can seek further evidence where the submitted information does not adequately demonstrate compliance. Depending on the evidence gap, physical anchor testing may form part of the response.
Who should specify the anchor test load?
The load should be provided by the responsible designer or specifier with knowledge of the connection design and test objective, rather than being independently invented by the site-testing technician.
What is proof testing?
Proof testing applies a specified non-destructive load to selected installed anchors primarily to provide evidence relating to installation quality.
Can proof testing establish an allowable anchor load?
Not automatically. Testing intended to establish resistance in an unknown substrate follows a different preliminary or suitability-testing approach.
When is site testing particularly useful?
It is especially useful where base-material performance is uncertain, the actual substrate falls outside available product data, installation records are inadequate or the project specification requires additional installation verification.
Do anchors with an ETA always need proof testing?
No. An appropriate assessment combined with correct design, a matching substrate and controlled installation may provide the required evidence without a universal need for site proof testing. A project-specific specification can still require it.
Does a tester have to be a CFA member?
Competence is essential, and recognised industry schemes can provide evidence of competence. Membership or a particular commercial certification should not be described as a universal statutory requirement unless the project specification expressly requires it.
Does the testing company have to be UKAS accredited?
Not as a universal consequence of carrying out routine site anchor testing. A project specification may impose particular accreditation requirements, while the test equipment itself should have appropriate calibration traceability.
Can the tester certify that an anchor is structurally safe?
The tester should report the factual results of the specified test. Structural interpretation and acceptance of the connection remain with the responsible engineering party.
Should working anchors be tested to failure?
Normally no. Where ultimate resistance needs to be investigated, purpose-installed or sacrificial anchors should be used within an appropriate engineering test programme.
What happens if one proof test fails?
The failure should be recorded and referred to the responsible engineer. The cause should be investigated and the test programme expanded in accordance with the applicable testing procedure rather than treating the failed anchor as an isolated replacement exercise.
Does the Building Safety Regulator require pull testing on higher-risk buildings?
There is no universal requirement to pull-test every fixing merely because the work concerns a higher-risk building. What becomes particularly important is the complete and traceable design, installation, change-control and verification record for safety-critical work.

Primary Technical References

The Building Regulations 2010, as amended — statutory framework for building work in England, including the functional requirements relating to structural safety.
Building Safety Act 2022 and higher-risk building control regime — relevant to dutyholder responsibilities, regulatory control and information management for applicable higher-risk building work.
Approved Document A — Structure — statutory guidance supporting compliance with the structural requirements of the Building Regulations.
BS 8539:2012+A1:2021 — Code of practice for the selection and installation of post-installed anchors in concrete and masonry, including provisions relating to site testing.
Construction Fixings Association guidance — industry guidance on site testing of construction fixings, including proof and preliminary/suitability testing procedures, equipment and reporting.
Relevant ETA / EAD documentation — assessed anchor performance within defined base materials, installation conditions, loading types, edge distances, spacing and other parameters.

Source Context and Technical Note

This article is a STRUCTinspect technical explainer examining the relationship between Building Control compliance and site testing of post-installed safety-critical fixings in London and England.
The phrase certified pull-out testing is commonly used commercially but does not by itself define the engineering purpose, test method, load or acceptance criteria. Project teams should identify whether the required exercise is proof testing of installed anchors, preliminary/suitability testing to establish performance in an uncertain substrate, or another defined verification activity.
Building Control and the Building Safety Regulator review evidence of compliance but do not replace the structural designer. The responsible engineering party should determine the required anchor resistance, select or approve the fixing system, specify site testing where appropriate and assess the technical significance of test results.
Site testing should not be used to bypass a deficient fixing design, and successful proof tests should not automatically be converted into new design resistance values. Likewise, a factual site-test report should not be presented as a general structural certificate for anchors that were not tested.
Requirements can also arise contractually from structural specifications, façade specifications, manufacturers, clients, insurers or project-specific quality plans even where no blanket statutory testing requirement exists.
This article does not provide structural design, regulatory approval, certification or legal advice. Requirements for individual fixings should be determined from the applicable regulations, approved design, product assessment, substrate conditions, project specification and instructions of the responsible competent professionals.