Building Health Assessment
Independent indoor air quality and ventilation assessors · Since 1999
A building health assessment gives owners, occupiers and facilities teams one coordinated view of the indoor environment. Instead of treating air quality, ventilation hygiene and comfort as unrelated subjects, it examines how the building, its systems and its pattern of use interact. The scope can cover indoor air quality, CO₂-based fresh-air assessment, ventilation cleanliness and thermal comfort. Lighting and acoustics can also be included where they align with a BS 40102-1 brief. The result is a practical baseline, a RAG summary by domain and a prioritised route from evidence to improvement.
Established 1999 · 2,500+ assessments · SafeContractor approved · BOHS Affiliate Member · London & South East
A joined-up review of the occupied environment
The assessment starts with the decision it must support: an asset plan, an occupant concern or a record of current condition. We agree representative floors, room types, plant areas and operating periods, then compare spaces with different use, ventilation or complaint history under one documented method.
Domains included in the scope
Each domain uses an appropriate method and is interpreted separately before the findings are brought together.
| Domain | How it is examined | What the evidence can show |
|---|---|---|
| Indoor air quality | Real-time logging of selected parameters, with laboratory sampling where a specific substance requires identification | Patterns by location, occupancy and time, plus matters needing targeted investigation |
| CO₂ and fresh air | CO₂ logging in occupied rooms alongside occupancy and ventilation schedules | Whether ventilation appears adequate relative to use and where patterns warrant HVAC review |
| Ventilation hygiene | Review of records and accessible system inspection using the method appropriate to the ductwork or AHU | Condition at representative points and the evidence supporting maintenance priorities |
| Thermal comfort | Temperature and relative-humidity logging with observations about room use and controls | Persistent, local or time-related comfort patterns |
| Lighting and acoustics | Measurements agreed for a BS 40102-1-aligned brief | Performance within the defined indoor environmental quality scope |
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How measurements are planned
We review drawings, occupancy, plant schedules and known concerns before selecting locations. Direct-reading instruments show occupied patterns over an agreed period. Laboratory samples are added when a particular compound requires identification. Accessible ventilation components are inspected separately. The report records equipment, points, duration, operating context and access restrictions.
From observations to a RAG summary
Results receive red, amber or green status against agreed criteria. Green records acceptable evidence; amber identifies uncertainty, deterioration or a planned action; red highlights a matter needing management attention or specialist investigation. Every rating links to measurements, photographs and interpretation, retaining the technical record behind the summary.
A prioritised improvement plan
Recommendations separate operational changes, maintenance, investigation and capital items, ordered by significance, evidence and dependencies. HVAC faults and other specialist matters go to the appropriate contractor. We remain the independent assessor and can verify the environmental outcome after work.
Repeat assessment and evidence of progress
A later review can repeat the domains, locations and operating context. We explain differences in occupancy or season, update the RAG position and distinguish completed work, residual issues and new priorities.
Is this the right page?
Choose IAQ Compliance Testing when the main requirement is evidence against a BREEAM, WELL pre-testing or BS 40102-1 project brief. Choose a Baseline Air Quality Survey when a first-time IAQ profile, rather than a broader indoor-environment review, will answer the question.
Limitations and what this assessment cannot tell you
The findings describe the agreed areas, domains and operating conditions during the assessment.
- Representative sampling does not inspect every room or concealed section of a system
- Short-term observations cannot describe every seasonal or occupancy condition
- CO₂ is interpreted as an indicator of ventilation relative to occupancy, rather than an airflow measurement
- Lighting and acoustics are included only when expressly defined within the commissioned scope
- Engineering diagnosis, repair, cleaning and building works remain with the appropriate contractors
What the building health report contains
The report connects management-level priorities to transparent supporting evidence.
- Scope, building context and representative locations
- Methods, monitoring periods and operating observations
- Results and a RAG summary for each commissioned domain
- Photographs, charts and stated assessment limitations
- Prioritised improvement plan with responsible discipline
- Repeat-assessment method for verifying progress
Related indoor air quality services
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