Inspection Methodology

Step 01

Scoping

Every inspection begins with understanding what you need to know. Not what data we can collect, but what questions you need answered.

For a single problem building, that might be: where is the water getting in, and how bad is the damage? For a portfolio programme, it might be: which of these 150 buildings need capital investment in the next three years, and in what order?

During scoping we establish the buildings to be inspected, the inspection objectives (condition assessment, thermal performance, water ingress investigation, compliance evidence, CAPEX planning), the capture methods required (visual, thermal, 3D, or a combination), access and operational constraints, the deliverables you need and the format you need them in, and your programme timeline and any external deadlines.

Scoping costs nothing and commits you to nothing. Its purpose is to ensure that the inspection we deliver answers the questions you are actually asking.

Step 02

Mission planning

Before any aircraft leaves the ground, each site receives a detailed mission plan covering airspace and regulatory assessment, site risk assessment, flight path design, and equipment selection.

We identify any airspace restrictions, flight restriction zones, or temporary notices that affect the operation. For sites near airports, hospitals, prisons, or other sensitive locations, specific permissions or operational adjustments may be required.

Every location receives a site-specific risk assessment addressing ground hazards, overhead obstacles, proximity to roads and pedestrians, weather constraints, emergency procedures, and communication protocols. For occupied residential buildings, we assess the impact of drone operations on residents and identify any notification requirements.

The flight paths are designed to achieve complete coverage of the specified building elements. The sensor payload is selected based on the inspection objectives: a 48MP+ visual camera for condition surveys, a radiometric thermal camera for thermal inspections, or photogrammetric and LiDAR payloads for 3D capture.

Step 03

Capture

Our team arrives on site, confirms the conditions match the mission plan, and conducts the flight programme. We capture high-resolution visual imagery of every roof zone, facade panel, drainage element, and specified external feature. Where commissioned, radiometric thermal imagery is timed to maximise thermal contrast between wet and dry construction, sound and failed insulation, or air leakage paths.

Every image is GPS-tagged and timestamped, providing a verifiable evidence trail. We confirm complete coverage before leaving site. If an area has been missed or the imagery quality is insufficient, additional passes are flown immediately.

All operations comply with UK CAA regulations. Our pilot team holds General Visual Line of Sight Certificates (GVC) and operates under a Specific Category authorisation. The entire capture is non-invasive and non-destructive: we do not access roofs or facades physically, and we do not move, lift, or disturb any building component.

Step 04

AI-assisted detection

After capture, the imagery is processed through Ovrsite’s detection engine. It analyses thousands of images per building, identifying and categorising features that may represent defects, deterioration, or anomalies.

These include membrane damage (blistering, cracking, splitting, displacement), flashing failures (lifting, corrosion, sealant deterioration), drainage defects (blocked outlets, displaced hoppers, ponding evidence), vegetation and biological growth, structural movement indicators, thermal anomalies (moisture retention, insulation voids, cold bridging, air leakage), and surface deterioration (spalling, erosion, coating failure, pointing defects).

The detection engine applies consistent analysis across every building in a portfolio. A defect that is visible in the imagery is identified regardless of which building it appears on. This consistency is difficult to achieve through manual image review of thousands of photographs, which is why the AI-assisted stage matters at scale.

The detection engine does not replace professional judgement. Every finding is reviewed before it reaches you. It does not diagnose root causes. And it does not guarantee detection of every defect: some are not visible in imagery.

Step 05

Professional verification

Every finding produced by the detection engine is reviewed by Ovrsite’s verification team before it is delivered. False positives are removed. Each confirmed finding is assigned a defect category from a standardised taxonomy and graded on a defined severity scale reflecting urgency of intervention.

Each finding is positioned on the building using a zone or element reference system, so it can be located by a contractor on site without ambiguity. Where commissioned, each finding is linked to an estimated cost of repair based on the scope of work implied by the defect type, severity, and location.

The verification step is what separates a building intelligence service from a data capture service. Without it, you receive imagery and automated annotations. With it, you receive a professionally reviewed condition record.

Step 06

Reporting and intelligence

The verified findings are assembled into the deliverables specified during scoping. Building-level reports contain high-resolution annotated imagery of each identified finding, a summary of building condition by element, a complete finding register with category, severity, location, and recommended action, thermal anomaly mapping where included, and CAPEX-relevant cost projections where commissioned.

Reports are produced to RICS-aligned standards where applicable, meaning the assessment methodology, grading criteria, and reporting structure follow recognised professional practice.

Portfolio-level intelligence includes comparative condition analysis across the portfolio, risk-ranked building registers, investment priority matrices, aggregated defect-type analysis, and year-on-year trend comparison on repeat inspections.

Step 07

Atlas: ongoing intelligence

Atlas is not a report archive. It is the working system where your condition data lives, your actions are tracked, and your evidence accumulates.

Through Atlas you can view every finding for every inspected building with supporting imagery and thermal evidence, filter and prioritise findings by severity, cost, building, element, or defect type, track actions taken against findings, export data for integration with your asset management and CAPEX planning systems, compare current condition against previous inspections to identify deterioration or improvement, and generate reports and summaries for boards, funders, regulators, or contractors.

For higher-risk buildings, Atlas provides the dated, digital, accessible condition record that the golden thread requires. For portfolio programmes, Atlas provides the persistent intelligence layer that turns a one-off inspection into a continuous asset management capability.

Standards and limitations

Standards we follow: UK CAA drone operational regulations; RICS-aligned condition assessment and reporting methodology; ISO 27001-certified infrastructure for data handling; Cyber Essentials certified operations; ICO-registered data controller.

Limitations we are transparent about:

• UAV inspection assesses the external building envelope. It does not assess internal condition, structural adequacy, or services.
• Thermal imaging identifies anomalies in surface temperature. It does not diagnose root causes. Professional interpretation is required.
• AI-assisted detection identifies visible and thermal anomalies. It cannot detect defects with no surface or thermal expression.
• Weather conditions affect when inspections can be conducted and the quality of thermal data. We reschedule rather than deliver compromised results.
• Our findings and condition assessments do not constitute structural engineering advice, fire safety assessments, or statutory surveys.

We would rather explain what we cannot do clearly than imply we can do everything.