If you’re delivering a BREEAM project, post-construction VOC testing is one of the final and most important steps in proving indoor air quality (IAQ). But requirements have changed over time.
From single-sample testing in BREEAM 2014 to evidence-driven, multi-point verification in BREEAM V7, understanding what’s required (and when) can be confusing.
This guide breaks it down clearly so you know:
- What VOC testing is
- What thresholds you need to meet
- How sampling requirements differ across BREEAM versions
- What to expect on your project
What is VOC Testing in BREEAM?
VOC (Volatile Organic Compound) testing measures the level of airborne chemicals inside a building after construction.
It ensures the space is safe for occupants before handover.
For BREEAM, this typically focuses on:
- TVOCs (Total VOCs)
- Formaldehyde levels
Testing is carried out after a flush-out period, once the building is complete but before occupation.
BREEAM VOC Testing Requirements by Version
BREEAM 2014: Basic Snapshot Testing
BREEAM 2014 used a simple, single-sample approach.
Requirements:
- TVOCs: ≤300 µg/m³
- Formaldehyde: ≤100 µg/m³
- One sample from a representative area
- Flush-out required before testing
Testing was optional as a credit, as projects could rely on low-emission materials instead.
What this means:
A quick snapshot of IAQ, but limited insight across the whole building.
BREEAM 2018: More Reliable Testing with Triple Sampling
BREEAM 2018 introduced triple sampling, improving accuracy and confidence.
Requirements:
- TVOCs: ≤500 µg/m³
- Formaldehyde: ≤100 µg/m³
- Three samples at each location
The TVOC limit was relaxed to make compliance easier while improving testing reliability.
What this means:
Relaxed TVOC limit made compliance more achievable while maintaining safe IAQ. Triple sampling increased measurement accuracy, reliability, and confidence.
BREEAM V6 / V6.1: Stricter Limits and Standardised Testing
V6 tightened requirements again, focusing more on occupant health and consistency.
Requirements:
- TVOCs: ≤300 µg/m³
- Formaldehyde: ≤100 µg/m³
- Triple sampling required
- ISO 16000 methodology
- Flush-out mandatory
- Full documentation required
All samples must pass for compliance.
What this means:
No weak spots allowed, every tested area must meet the standard.
BREEAM V7: Evidence-Driven IAQ Verification
BREEAM V7 builds on V6 but increases focus on evidence and auditability.
Requirements:
- TVOCs: ≤300 µg/m³
- Formaldehyde: ≤100 µg/m³
- Triple sampling standard
- Clearly justified sampling locations
- Full evidence for compliance
Again, every location must meet the threshold.
What this means:
Testing is no longer just a tick-box exercise, it must stand up to scrutiny.
What About Residential BREEAM Projects?
Residential schemes are increasingly aligning with commercial standards.
Typical approach:
- Triple sampling (recommended)
- TVOCs: ≤300 µg/m³
- Formaldehyde: ≤100 µg/m³
Testing may still be optional for lower ratings, but expected for higher BREEAM scores.
Quick Comparison: BREEAM VOC Testing Requirements
| BREEAM Version | Sampling Method | TVOC Limit | Formaldehyde | Key Change |
| 2014 | Single sample | ≤300 µg/m³ | ≤100 µg/m³ | Optional credit |
| 2018 | Triple sample | ≤500 µg/m³ | ≤100 µg/m³ | Improved reliability |
| V6 / V6.1 | Triple sample | ≤300 µg/m³ | ≤100 µg/m³ | Stricter + ISO standards |
| V7 | Triple sample | ≤300 µg/m³ | ≤100 µg/m³ | Evidence-focused |
| Residential | Triple recommended | ≤300 µg/m³ | ≤100 µg/m³ | Aligning with non-resi |
Key Takeaways for Your Project
- VOC testing has evolved from single-point checks to full-building verification
- Triple sampling is now standard across most schemes
- The key thresholds today are:
- TVOCs: ≤300 µg/m³
- Formaldehyde: ≤100 µg/m³
- All locations must pass, not just an average
- Documentation and evidence are now critical for compliance
Common Questions (FAQ)
When should VOC testing be done?
After construction is complete and following a flush-out period, but before occupation.
What happens if one location fails?
The project will not meet the credit until issues are resolved and re-tested.
Can we avoid testing?
In some schemes yes, but testing is increasingly expected, especially for higher ratings.
Need Help with BREEAM VOC Testing?
Getting VOC testing right first time avoids delays at handover and protects your BREEAM rating.
If you’re planning a project or need guidance on sampling strategy, thresholds or compliance, speak to our team.