Air Quality Inspection: Whole-Building IAQ Investigation

Scope is structured into six domains, each covered systematically rather than sampled.

Ventilation system. AHUs, terminal units, controls, schedules, demand-control logic, dampers, ductwork condition and access for cleaning. Output is benchmarked against BS EN 16798-1 and CIBSE Guide A.

Filtration. Filter classification, condition, sealing, bypass, change-out frequency and pressure-drop monitoring. Carbon stages are inspected for residual capacity.

Moisture and microbial risk. Cooling coils, drip trays, humidifiers, condensate routes, drainage, roof penetrations and any history of water ingress. Surface moisture meters and thermal imaging are used non-invasively.

Materials and finishes. Recent fit-out works, flooring, paint and adhesive systems, furniture procurement standards and cleaning chemistry — anything that contributes to the VOC and formaldehyde load.

Occupancy and use patterns. Density, schedules, hot-desking, meeting-room utilisation, after-hours activity and any process equipment (printers, kitchens, labs) that loads the air at predictable times.

External environment. Outdoor air quality at the intake, proximity to traffic, loading bays, kitchens or extract discharges, and seasonal pollen and particulate context.

The process is designed to be unobtrusive and to give the building team a meaningful debrief inside a single working week.

1. Document review. O&M manuals, commissioning records, recent works packages, planned-maintenance logs and any previous IAQ data are reviewed before mobilisation.

2. Walkthrough survey. Two inspectors cover plant rooms, risers, occupied floors and external intakes — photographing, measuring and noting against a structured checklist.

3. Supporting sensor work. Spot CO₂, PM2.5, temperature and humidity readings in the breathing zone supplement the qualitative observations. Continuous loggers are deployed in priority zones if 24–48 hour data is needed.

4. Debrief. A 60-minute closing meeting with the building team shares the headline findings and confirms remediation priorities before the report is drafted.

5. Reporting. A scored report is delivered within ten working days, ready for board, contractor or assessor consumption.

The report is structured for action, not archive.

Scorecard. Each of the six domains scored Pass / Partial / Fail against the relevant benchmark, with an overall building grade.

Findings register. Numbered observations with photographs, location references and the standard each is measured against.

Remediation plan. Findings ranked by health impact and cost, sequenced into immediate, short-term and capital actions. Indicative budget bands are included where helpful.

Verification protocol. A short, repeatable method for confirming improvements after works so partial re-inspection is straightforward.

Five scenarios justify the investment.

Annual baseline. A documented yearly inspection underpins ESG reporting and gives the FM team a defensible position when occupants ask why air quality has changed.

Post-acquisition due diligence. New owners benefit from an independent view of inherited HVAC, before maintenance budgets are committed.

Complaint clusters. When multiple occupants in different zones report symptoms, an inspection separates building-wide systemic issues from local sources.

Certification. WELL v2, BREEAM and Fitwel all need documented evidence that an inspection has been carried out and findings actioned.

Pre-handover. Soft-landings projects use an independent inspection to verify designed performance is being delivered before the contractor leaves site.

Inspection findings feed naturally into the rest of the IAQ programme.

Targeted testing — laboratory-grade VOC testing or mould air testing for findings that need pollutant-level quantification.

Ventilation engineering — a ventilation assessment for findings that involve airflow or balance.

Continuous monitoring — a permanent monitoring programme for buildings where ongoing oversight is justified by occupancy, certification or vulnerability of occupants.