High‑Capacity Air Tightness Testing for Buildings Over 10,000 m²

For High‑Capacity Air Tightness Testing for Buildings Over 10,000 m² – APT Sound Testing Leads the Way

In today’s construction landscape, airtightness is a critical performance requirement. As buildings become larger and more complex, developers need a testing partner with the equipment, accreditation, and technical expertise to deliver accurate results at scale.
APT Sound Testing is one of the very few UK companies capable of undertaking air pressure testing on huge buildings above 10,000 m², thanks to our high‑power 6‑fan system and our Level 2 ATTMA and UKAS‑accredited status.

This article explains why our capability matters, how our technology works, and why contractors, developers, and design teams trust us for large‑scale airtightness testing and diagnostic surveys.

Industry‑Leading Large-Scale Blower Fan System for Very Large Buildings

Most testing companies operate with one or two fans — suitable for houses and small commercial units. But large buildings require far more power and airflow. APT Sound Testing now operates a high‑capacity multi-blower fan system, giving us the ability to test:

Warehouses and logistics hubs
Large retail units and supermarkets
Schools, hospitals, and public buildings
Multi‑storey developments
Industrial and manufacturing facilities
Buildings with complex internal zoning

Our system delivers:

Stable test pressures across very large internal volumes
Accurate readings even on buildings exceeding 10,000 m²
Faster test times, reducing disruption to site programmes
Full compliance with ATTMA TSL1 & TSL2 and Part L

This level of capacity is rare — most companies simply do not have the equipment to test buildings of this size. Our investment ensures clients can rely on a single, highly experienced provider for even the most demanding projects.

Level 2 ATTMA Registered & UKAS‑Accredited Testing Laboratory

Large‑scale airtightness testing requires more than powerful fans. It requires competence, accreditation, and proven technical quality and air tightness test procedures.

APT Sound Testing is:

Level 2 ATTMA Registered – authorised to test large, complex, and multi‑zone buildings
A UKAS‑Accredited Testing Laboratory – ensuring accuracy, traceability, and regulatory acceptance

This gives clients:

Guaranteed compliance with Building Regulations Part L
Confidence that results are independently verified
Acceptance by Building Control, BREEAM assessors, and warranty providers
Reduced risk of retesting or project delays

For large buildings, accreditation isn’t optional — it’s essential.

Advanced Air Leakage Diagnostic Surveys

Achieving airtightness on a large building can be challenging. Even small defects can cause major leakage when multiplied across thousands of square metres.
APT Sound Testing provides comprehensive air leakage diagnostic surveys using a combination of:

1. Smoke Testing

Under pressurised conditions, smoke reveals:

Leaking cladding interfaces
Poorly sealed service penetrations
Defective door and window seals
Roof‑to‑wall junction failures
Hidden voids and construction gaps

Smoke testing provides instant visual confirmation of leakage paths.

2. Thermal Imaging

Thermal imaging identifies:

Cold air infiltration
Missing or poorly installed insulation
Thermal bridging
Hidden leakage not visible to the eye

When combined with depressurisation blower door testing, thermal imaging inspections becomes a powerful diagnostic tool.

3. Detailed Air Leakage Reports

We produce clear, contractor‑friendly reports including:

Annotated photos and thermal images
Leakage severity ratings
Root‑cause analysis
Recommended remedial actions
Priority lists for sealing works

These reports allow site teams to carry out targeted remedial sealing quickly and efficiently.

Thermal-Imaging-Survey-Door-Defects-by-APT-Sound-Testing — #image_title

Why Large Buildings Require Specialist Testing

Testing a building over 10,000 m² is not simply a scaled‑up version of testing a house. It requires:

High‑capacity fans
Advanced flow measurement
Multi‑zone testing strategies
Experienced engineers
Robust diagnostic methods
Accredited reporting

Without the right equipment and expertise, results can be inaccurate — leading to delays, retesting, and increased costs.
APT Sound Testing eliminates these risks by providing a complete, accredited, high‑capacity testing service.

Supporting Contractors, Developers & Design Teams

We understand the pressures of modern construction programmes. Our service is designed to support your project from start to finish:

Design‑stage consultancy
Pre‑test inspections
High‑capacity large building testing
Diagnostic surveys
Targeted remedial guidance
Fast turnaround reporting

Our goal is simple: help you achieve compliance first time.

High-Capacity Airtightness Testing for BREEAM & Energy Performance

For projects targeting BREEAM, low‑carbon performance, or enhanced energy efficiency, airtightness is a key factor.
Our services support:

BREEAM Hea 02 & Ene 01 credits
Improved EPC and SBEM outcomes
Reduced heating and cooling loads
Better long‑term building performance

Large buildings have large energy bills — airtightness is one of the most cost‑effective ways to reduce them.

Why Choose APT Sound Testing?

High‑Power Blower Door Fan System for buildings above 10,000 m²
Level 2 ATTMA Registered
UKAS‑Accredited Laboratory
Smoke & Thermal Imaging Diagnostics
Detailed, actionable reporting
Fast turnaround
Nationwide coverage

APT Sound Testing is one of the UK’s leading providers of large‑scale airtightness testing — trusted by contractors, developers, and design teams nationwide.

Accreditations & Technical Competence for high-capacity air tightness testing

APT Sound Testing is a UKAS‑accredited ISO/IEC 17025 testing laboratory specialising in on‑site (field) air tightness testing for commercial and large‑scale buildings. Our accreditation demonstrates that all testing, reporting and quality processes meet the highest technical and procedural standards recognised in the UK.

We are an ATTMA Level 2 registered organisation, qualified to test Large, Complicated and High‑Rise (LCHR) buildings, as well as phased and zonal hand‑over projects. In addition, we are ATTMA EA accredited, enabling us to produce accurate and compliant envelope area calculations for complex commercial structures.

With over 20 years of specialist experience, our engineers have delivered testing and consultancy on some of the UK’s most prestigious and technically challenging developments, including Battersea Power Station and the Imperial War Museum London.

Our combination of accredited competence, deep technical expertise, and long‑standing industry experience ensures that every project receives reliable, repeatable and fully compliant air tightness testing to the highest professional standard.

📞 Contact Us Now

APT Sound Testing is a UKAS‑accredited testing laboratory and an ATTMA Level 2 certified air‑tightness testing provider, giving you complete confidence that your commercial building will be tested to the highest industry standards.

We use the latest modular, UKAS‑calibrated blower door systems, capable of testing everything from small commercial units to large warehouses and complex multi‑storey buildings. Our advanced diagnostic tools — including smoke tracing and thermal imaging — ensure fast, accurate identification of air leakage paths so your project passes first time.

👉 Contact us today at info@aptsoundtesting.co.uk or call Darren on 07775623464 to book your commercial air tightness test and ensure full compliance with UK Building Regulations.