PART_O
Approved Document O (2022)
Overheating Mitigation
Solar control glazing, external shading, thermal mass. Newest Part — least understood by builders.
Cost of failure: £5,000–£10,000 retrofit shading
Materials
Certified products for PART_O
| Product | Manufacturer | Certification | Lead time |
|---|---|---|---|
|
Pilkington K Solar control glazing
g-value 0.40 · light transmission 70% |
Pilkington | BS EN 410 solar factor verified | 14d |
Packages
Deal packages including PART_O
Tier 1
Single Part Compliance Pack
£150
48h turnaround
- Certified product schedule
- UKCA / BBA certification references
- Supplier contact details
- Approved Document clause references
- 48-hour turnaround
Tier 2
Full Compliance Schedule
£350
48h turnaround
- Multiple Parts covered (B/E/L typical)
- Building control ready documentation
- BREEAM Mat credit references
- Multiple supplier options compared
- Installation specification notes
- 1 revision included
Tier 3
Premium Compliance with Quotes
£600
48h turnaround
- Full multi-Part schedule
- Supplier quotes obtained
- Gateway 2 ready documentation
- BREEAM credit mapping
- Future Homes Standard alignment
- 2 revisions included