Airtightness Testing & Air Leakage Testing Services London & Home Counties
Professional airtightness testing and air leakage testing services throughout London and the Home Counties.
APT Sound Testing provides independent ATTMA-compliant air permeability testing for residential and commercial developments across Greater London, Surrey, Kent, Essex, Hertfordshire, Buckinghamshire, Berkshire and Sussex. We help developers, contractors, architects and energy assessors achieve Building Regulations compliance while delivering fast, reliable air testing and certification. APT is a UKAS accredited air testing laboratory.
ATTMA-Compliant Air Tightness Testing for Residential & Commercial Developments
Our Airtightness Testing Services Include:
- Residential air tightness testing
- Commercial air leakage testing
- Apartment and block testing
- SAP air pressure testing
- SBEM compliance testing
- ATTMA-compliant certification
- Blower door testing
- Air leakage diagnostics
- Retesting following remedial works
Fast appointments across London and the Home Counties ATTMA-compliant testing Residential and commercial projects Competitive fixed quotations Rapid certification turnaround
Airtightness Testing for Building Regulations Compliance
Airtightness testing, also known as air leakage testing or air permeability testing, measures the amount of uncontrolled air escaping through the building envelope.
The test is carried out using calibrated blower door equipment to determine whether a building meets its air permeability target under Part L of the Building Regulations.
Testing is commonly required for:
- New-build houses
- Apartment developments
- Mixed-use schemes
- Commercial offices
- Schools and education facilities
- Healthcare buildings
- Warehouses and industrial units
- Hotels and leisure facilities
Whether your project is located in Central London, Greater London or the surrounding Home Counties, our team can provide testing and certification to support Building Control approval for Part L.
Why Airtightness Matters
Excessive air leakage can significantly affect the performance of a building.
Benefits of achieving good air tightness include:
Reduced Energy Costs
Lower heat loss means reduced heating and cooling demand throughout the year.
Improved Occupant Comfort
Minimise draughts and cold spots while creating a more stable indoor environment.
Better EPC and Energy Performance
Improved airtightness can help achieve energy performance targets and sustainability objectives.
Reduced Carbon Emissions
Lower energy consumption helps reduce the building’s environmental impact.
Improved Building Durability
Reducing uncontrolled air movement can help minimise moisture migration through the building fabric.
Airtightness Testing for Residential Developments
We regularly undertake air tightness testing for:
- Single dwellings
- Self-build projects
- Housing developments
- Affordable housing schemes
- Apartment blocks
- High-rise residential projects
- Luxury residential developments
Our technicians work closely with site managers and developers to ensure testing is completed efficiently and with minimal disruption to construction programmes.
Commercial Air Leakage Testing
Commercial buildings often require air permeability testing to demonstrate compliance with Part L and associated energy performance requirements.
We provide commercial testing for:
- Office buildings
- Retail developments
- Industrial units
- Distribution centres
- Healthcare facilities
- Educational buildings
- Community buildings
- Hospitality developments
Our experience across a wide range of building types enables us to deliver testing solutions tailored to project requirements.
Air Leakage Diagnostics and Investigation
If a building is not expected to achieve its target air permeability result, we can provide diagnostic investigations before or during testing.
Diagnostic services may include:
- Smoke testing
- Leakage tracing
- Thermal imaging support
- Building envelope inspections
- Construction detail reviews
- Service penetration assessments
Identifying leakage routes early can reduce programme delays and minimise the need for costly remedial works.
Why Choose APT Sound Testing for your blower door test?
Experienced Testing Specialists
Practical knowledge of residential and commercial construction throughout London and the South East.
Fast Turnaround Testing
Flexible appointments to meet demanding construction programmes.
ATTMA-Compliant Certification
Testing undertaken using calibrated equipment and recognised industry methodologies for ATTMA TSL1 for Dwellings, and ATTMA TSL2 for Commercial Buildings.
Competitive Pricing
Clear quotations with no hidden costs.
London & Home Counties Coverage
We provide airtightness testing throughout:
- Greater London
- Surrey
- Kent
- Essex
- Hertfordshire
- Buckinghamshire
- Berkshire
- East Sussex
- West Sussex
Frequently Asked Questions
What is the difference between airtightness testing and air leakage testing?
There is no practical difference. Both terms describe the measurement of air escaping through the building envelope using calibrated pressure testing equipment.
When should an airtightness test be carried out?
Testing is generally undertaken when the building envelope is complete, services are installed and all permanent sealing works have been finished.
What happens if the building fails?
Our team can identify likely leakage paths and recommend remedial actions before a retest is undertaken.
Do you provide ATTMA-compliant certificates?
Yes. We provide certification suitable for submission to Building Control and energy assessors.
Book Your Airtightness Test in London
APT Sound Testing provides professional airtightness testing and air leakage testing services across London and the Home Counties.
Whether you require testing for a single dwelling, residential development, apartment block or commercial building, our experienced team can help you achieve compliance quickly and efficiently.
Contact APT Sound Testing today for a competitive quotation and fast testing availability.