Borescope
Cavity Inspections
See inside your walls — without opening them up.
High-definition fibre-optic camera surveys to verify insulation continuity, locate cavity bridging and debris, assess wall tie condition, and trace the root cause of damp — all through a single 10mm access hole.
- 10mm access hole — professionally sealed on the day
- HD video & image evidence from inside the cavity
- Compliance report suitable for building control handover
10mm
Access Hole Only
HD Video
Fibre-Optic Evidence
Same Day
Hole Sealed On Site
Part L
Compliance Ready
What is a borescope cavity inspection?
A borescope cavity inspection is a fast, non-destructive method of examining the internal condition of a property's walls and hidden structural voids. By drilling a single 10mm access hole through the external mortar joint, our expert surveyors insert a high-definition fibre-optic probe directly into the cavity to capture clear video and photographic evidence of your building fabric.
Without this type of inspection, hidden defects — insulation gaps, cavity bridging, corroded wall ties, trapped construction debris — remain invisible until they cause expensive structural damp, failed building regulations, or delayed completion certificates. A borescope survey gives you visual clarity before problems escalate.
Who needs one?
Developers and contractors commissioning pre-completion snagging under Part L; property owners investigating unexplained damp or mould; landlords and housing associations assessing wall tie condition; retrofit co-ordinators and energy assessors needing to understand the existing cavity before specifying insulation measures. We cover all of these scenarios.
How is the access hole made good?
Once the survey is complete, the drill hole is filled with colour-matched, weatherproof sealant. The mortar joint is restored professionally, leaving the brickwork virtually untouched. All dust is collected during drilling to keep the site clean.
Six reasons to survey your cavity.
From pre-completion snagging on new builds to tracing the source of persistent damp in existing properties — a borescope inspection provides factual, visual evidence where guesswork is expensive.
Insulation Continuity Check
Confirm that cavity wall insulation is distributed evenly, has not settled over time, and is free of missing pockets — essential before any Part L sign-off or retrofit assessment.
Cavity Bridging & Debris
Locate mortar drops, loose brick ties, and trapped construction debris that act as moisture pathways between the outer and inner leaves of the wall.
Wall Tie Condition
Inspect the condition of structural wall ties for corrosion or failure without removing any brickwork — a cost-effective alternative to intrusive investigation.
Damp & Mould Investigation
Visually trace internal condensation, black spot mould, and penetrating damp to its hidden origin within the wall fabric — providing evidence for targeted remedial action.
Pre-Completion Snagging
Verify that a newly built development meets the insulation requirements of Part L (Conservation of Fuel and Power) before the completion certificate is issued.
Retrofit Planning Support
Establish the current state of the cavity before specifying insulation measures as part of a Retrofit Assessment, reducing the risk of installing insulation into a contaminated or bridged cavity.
Total visual clarity, zero disruption.
Expert surveyors, high-definition fibre-optic equipment, and a comprehensive compliance report — so you know exactly what is inside your walls before work begins or sign-off is required.
Clear evidence, included as standard
Raw video and photographic captures from inside the cavity are included in every report — no extra fee for evidence packs or building control submission copies.
Expert Surveyors
Our surveyors are experienced in non-destructive building diagnostics. Reports are clear, unbiased, and accepted for building control handovers and Part L compliance sign-off.
High-Definition Fibre-Optic Camera
A specialist fibre-optic probe with an adjustable LED light source records sharp photographic and video evidence directly from inside the wall cavity — giving you a factual, indisputable record.
Non-Destructive — 10mm Access Only
A single 10mm hole through the mortar joint. No chasing, no demolished brickwork, no structural disruption. The site is left clean and the access point professionally sealed on the day.
Detailed Compliance Reports
Every survey produces a comprehensive digital report with raw video and image captures, a written narrative, and specific recommendations — ready for building control, contractors, or your client.
Pinpoints the Root Cause
Rather than guessing at the source of damp, mould, or insulation failure, a borescope survey gives you visual confirmation from inside the wall — so remedial work targets the actual problem.
Nationwide Coverage
Domestic and non-domestic properties across England, Wales, Scotland and Northern Ireland. One specialist team, consistently applied methodology, wherever your project is located.
Five steps to your cavity report.
A clean, systematic process from location mapping to report delivery — completed in a single site visit with no structural disruption.
Location Mapping
Our surveyors identify optimal, low-impact points across your property's elevations to obtain the best internal viewing angles and fullest coverage of the cavity.
Precision Drilling
A single 10mm hole is drilled through the external mortar joint. All dust is collected immediately on site — the surrounding brickwork is not touched.
HD Inspection
The fibre-optic probe with adjustable LED illumination enters the void and records sharp photographic and video evidence of the full cavity interior.
Making Good
Once the survey is complete, the drill hole is filled with colour-matched, weatherproof sealant — the mortar joint is restored professionally before we leave site.
Compliance Report
You receive a comprehensive digital report with raw video and image captures from inside the cavity — ready for building control handovers and Part L compliance sign-off.
Quoted per project.
Pricing depends on building size, number of elevations, and the scope of investigation required. Send us the address and a brief description of what you need to check and we will return a fixed-price quote.
Priced individually based on building size, number of inspection points, and the nature of the investigation — whether pre-completion snagging, insulation verification, damp diagnosis, or wall tie assessment.
- HD video & photographic evidence from inside the cavity
- 10mm access hole professionally sealed on the day
- Comprehensive digital compliance report included
- Suitable for building control handover & Part L sign-off
Pricing is project-specific. Contact us with the property address and a brief description of what you need to investigate and we will confirm the fixed price.
Protect your build quality — see what's inside.
Don't let hidden construction defects or insulation gaps compromise your project, delay your completion certificate, or cause expensive future remedial work. Partner with one of the UK's leading nationwide building testing specialists.
Borescope questions.
Everything you need to know about cavity inspections — what the survey covers, how the access hole is made good, and how the report is used.
Still Got a Question? Ask Us Will the inspection damage my property?
No. The access hole is only 10mm in diameter and is drilled through the external mortar joint — not the brick face itself. Once the survey is complete, the hole is filled with colour-matched, weatherproof sealant, leaving the brickwork virtually untouched.
How long does a borescope survey take?
This varies by building size, but a standard domestic inspection is typically completed in a few hours. Larger or multi-storey buildings may take longer — we will give you an estimated site time when we quote.
Can a borescope survey be combined with other tests?
Yes. We commonly pair this with a Retrofit Assessment to support energy efficiency planning, or alongside Air Pressure Testing and SAP Calculations when preparing a Part L compliance package. Speak to us at quote stage and we will advise on the most efficient combination for your project.
When do I need a borescope cavity inspection?
A borescope survey is typically needed before cavity wall insulation installation (to confirm suitability), as part of pre-completion snagging on new builds (to verify Part L compliance), when investigating unexplained damp or mould, or to assess wall tie condition in older buildings without tearing down brickwork.
What does the report include?
You receive a comprehensive digital report containing video footage and still image captures from inside the cavity, a written narrative describing the findings at each inspection point, and specific recommendations — suitable for building control handovers, Part L compliance sign-off, or use by a contractor.
What is cavity bridging and why does it matter?
Cavity bridging occurs when mortar drops, loose brick ties, or construction debris span the gap between the inner and outer leaves of a cavity wall. Bridges act as a moisture pathway, drawing water from the external face through to the internal leaf — a common cause of penetrating damp that is invisible without a camera inside the cavity.
Can you inspect insulation that was installed years ago?
Yes. Borescope inspection is one of the only reliable non-destructive methods to confirm whether existing cavity wall insulation has settled, degraded, or left voids over time. This is particularly relevant for retrofit energy assessments and when investigating persistent damp in older properties with previously-treated walls.
How much does a borescope inspection cost?
Pricing is quoted per project based on building size, number of elevations, and the scope of inspection required. There is no standard day rate published — send us the address and a brief description of what you need to investigate and we will return a fixed-price quote.
Do you cover the whole of the UK?
Yes. Borescope cavity inspections are delivered across England, Wales, Scotland and Northern Ireland. Tell us the postcode and we will confirm availability at quote stage.