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 around the agreed building elements, access constraints and capture objectives. The sensor payload is selected based on the inspection objectives: visual and thermal cameras appropriate to the agreed capture scope.

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 the agreed roof zones, elevations, drainage elements and external features where conditions and access permit. Where commissioned, radiometric thermal imagery is timed to maximise thermal contrast between wet and dry construction, sound and failed insulation, or air leakage paths.

Available capture timestamps, location metadata and source-image references are retained. Missing or uncertain metadata should remain explicit. We review coverage and image quality against the agreed scope. Gaps are recorded, and any additional capture is subject to safe conditions and access.

Ovrsite typically conducts drone operations in the UK Specific category. Flight planning addresses the applicable operational authorisation, airspace restrictions and site-specific controls. Capture is non-contact; physical testing and intrusive investigation are separate activities.

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. Potential defects may be identified where the imagery and detection method support them. 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. Some defects have no visible or thermal indication and cannot be identified from the captured imagery.

Step 05

Human review

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, to support a contractor or specialist in locating it for follow-up. 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 human-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 connect the captured evidence, human-reviewed findings and suggested next actions. Specialist assessment or professional advice may still be required.

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

Ovrsite Enterprise: ongoing intelligence

Ovrsite Enterprise connects condition evidence, reviewed findings and follow-up actions in a shared record.

Through Ovrsite Enterprise 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, Ovrsite Enterprise condition records can contribute to the wider building record maintained by the responsible team. For portfolio programmes, Ovrsite Enterprise provides the persistent intelligence layer that turns a one-off inspection into an ongoing record of captured evidence, reviews and actions.

Standards and limitations

Standards we follow: UK CAA drone operational regulations; AWS infrastructure certifications relate to the cloud provider, not certification of the Ovrsite application; Cyber Essentials Plus certified operations; ICO-registered data controller (ZC075362).

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.