Air Pressure / Air Permeability Testing (Part L)
Verify building airtightness to meet Part L standards and secure Building Control approval.
Air Pressure / Air Permeability Testing (Part L)
Verify building airtightness to meet Part L standards and secure Building Control approval.
What is it?
Tests the airtightness of a building to ensure minimal heat loss and compliance with Part L.
Why It Matters?
Improper airtightness can fail compliance and increase running costs.
What standards do we adhere to?
ATTMA TSL1/TSL2, Approved Document L.
Our Process
On-site test with calibrated equipment
Identify and advise on leakage
points
Retest if
required
Issue test
certificate
Compliance Bundles
Tailored packages to simplify your safety responsibilities and save you time.
As Designed Bundle
Ideal for planning and design stage
- SAP/SBEM Calculations (Design Stage)
- Overheating Assessment (Simplified or TM59)
- Water Efficiency Calculations
- Bespoke PSI Values (where required)
Book an As Designed bundle and get priority scheduling for your As Built stage testing.
As Built Bundle
Ideal for completion and sign-off
- SAP/SBEM Calculations (As Built)
- Air Pressure Testing
- Acoustic Testing
- Ventilation Flow Rate Testing
Book an As Designed + As Built package together and save 10% on total compliance costs.
Frequently Asked Questions
How quickly can you deliver results?
Many reports and test results can be turned around within 48 hours.
Can you work alongside my design team?
Yes — we regularly collaborate with architects, MEP consultants, and contractors to ensure smooth compliance.
Do you travel nationwide?
Yes — we operate across the UK.
Can I bundle services?
Yes — bundling services saves both time and money, and we’ll coordinate testing for maximum efficiency.