Air Permeability

Low Pressure Pulse Method

Level 3 in Air Permeability (Air Leakage) Testing of Existing Dwellings using the Low-Pressure Method


This OFQUAL-approved, three-day program, led by an experienced PAS 2030 Lead Auditor, equips participants with critical skills and comprehensive knowledge necessary for conducting air permeability tests in residential buildings. Our course combines theoretical insights with practical applications, crucial for evaluating and enhancing building energy efficiency as per PAS standards.

This course equips professionals with the expertise required for air permeability testing under both PAS 2030 and PAS 2035 standards, ensuring comprehensive compliance in retrofit projects from installation to whole-building assessment. Amid stringent standards, the demand for proficient air permeability testers is paramount. We address this skills gap by training candidates to ensure that properties meet essential air tightness requirements, a critical aspect of both PAS 2030 and PAS 2035 for retrofit projects. Our training enables professionals to conduct necessary tests accurately, ensuring that energy efficiency interventions are effective and compliant with the latest industry standards.

By obtaining certification through this course, participants expand their career opportunities in an evolving retrofit market. Retrofit businesses benefit by employing certified professionals who ensure compliance with PAS regulations, increasing operational precision, meeting critical compliance needs, and enhancing business reputation.

Course Details

Course Type: Classroom

Level: 3

Duration: 3 Days

Location: National

Category: Air Permeability

Air Pressure Testing in Existing Dwellings

What is Air Pressure Testing?

Air Pressure Testing, also known as air permeability testing, airtightness testing, or air leakage testing, is a method used to measure the amount of air that escapes from a building unintentionally through gaps and air leakage paths, such as under skirting boards or behind bath panels. This testing method excludes any air leakage through controlled ventilation systems like extract fans.

Introduced in 2002, this method is integral to building regulations for both residential and commercial buildings, which establish maximum limits for air leakage for each building type. Air pressure testing is also incorporated into retrofit processes, now included in PAS 2035/2030: 2023 methodology.

The unintended loss of air from a building can result in higher energy bills for occupants and increased carbon emissions from the building. Due to the convection cycle, when warm air escapes from a building, it is replaced by cooler external air, which then needs to be heated to maintain the building's temperature. The air pressure testing method quantifies this air loss into an "Air Permeability Score." A higher air permeability score indicates greater unintentional air loss from the building.

  1. Air Permeability Testing:

    • Air permeability testing, also known as air tightness testing or air leakage testing, measures the amount of air that escapes from a building unintentionally through gaps and air leakage paths in the building envelope.
    • The primary focus of air permeability testing is to assess the overall airtightness of the building envelope and to identify areas where air leakage occurs.
    • This testing method helps determine the energy efficiency of a building by quantifying the amount of heat loss due to air leakage, which can impact occupants' energy bills and carbon emissions.
    • Air permeability testing typically involves pressurising or depressurising the building and measuring the air flow rate to determine the level of air tightness.


  1. Background Ventilation Testing:

    • Background ventilation testing, on the other hand, assesses the effectiveness of the building's background or continuous ventilation systems in providing fresh air to the occupants.
    • Background ventilation systems are designed to provide a steady flow of fresh air into the building while removing stale air, without relying on windows or doors being opened.
    • The focus of background ventilation testing is to ensure that the ventilation system is functioning properly and meeting the required airflow rates to maintain indoor air quality and occupant comfort.
    • This testing method may involve measuring airflow rates, checking ventilation system components such as air vents and ductwork, and verifying compliance with building regulations and standards regarding ventilation.


In summary, air permeability testing evaluates the overall airtightness of the building envelope, which is required under building regulations to determine which type of ventilation system to install. It is also critical for the designer in the ventilation strategy to be compliant with PAS 2035:2023. Meanwhile, background ventilation testing assesses the performance of the continuous ventilation system in providing fresh air to occupants and maintaining indoor air quality, thereby mitigating the need for additional undercuts and trickle ventilation. Both testing methods are crucial for ensuring energy efficiency, comfort, and health in buildings.

To undertake any of our qualifications you will need to have prior knowledge of the chosen qualification you are looking to achieve. NetRet group has a rough guidance to eligibility, but this can change depending on the individual basis.

  • Candidates must have experience in their chosen area of skill.
  • Candidates must have basic level of literacy & numeracy.
  • Basic IT skills may be required but is not essential.
  • Ideally hold the DEA and RA qualifications.

We use a QuickBooks system with credit card and PayPal options for payment. If you need the invoice to go to a specific individual or department, please let us know and we will make sure our system has the correct information.

Upon Payment

  • You will receive an email giving you access to your employer Dashboard to check everyone’s progress.
  • Each operative will receive an email giving them access to their NVQ dashboard.
  • A staff member will call within 2 working days to carry out a general qualification induction and arrange a Professional Discussion.
  • you tutor/assessor will provide each operative with their assigned tasks.

You and/or your operatives will be enrolled onto an online system you can view at any time to check progression. Using our specialist portal you can communicate with us directly about anything they are not sure about.

Some of the benefits

  • Check Progress
  • Upload Work
  • Communicate with us
  • Get Direct Feedback
  • Join the Forum

Your Assessor/Tutor will talk you through system before you start and you can contact us if ever you need help.

Qualification Structure

This course aims to equip learners with the necessary skills and knowledge for air permeability testing in domestic housing using the low-pressure method. It's designed to meet the growing demand for PAS 2030 certified contractors, enhance operational efficiency, and strengthen brand reputation in retrofit market sectors.

Day 1: Introduction and Principles of Air Tightness

  • Morning Session:
    • Introduction to the Course
    • Overview of Air Permeability Testing Significance
    • Air Leakage Terminology: Understanding Infiltration, Air Leakage, Air-Tightness, Air Change Rate, Air Permeability
  • Afternoon Session:
    • Principles of Air-Tightness in Existing Dwellings
    • Materials and Approaches Used
    • Understanding Ventilation Systems in Domestic Dwellings
    • The Importance of a Whole House Approach in Air-Tightness Testing

Day 2: Testing Procedures and Industry Standards

  • Morning Session:
    • The Importance of Mechanical Ventilation in Domestic Dwellings
    • Benefits of Air-Tightness in Domestic Retrofit
    • Overview of UK Building Regulations and Legislation for Air Pressure Testing
    • Health and Safety Considerations in Air-Tightness Testing
  • Afternoon Session:
    • Air-Tightness Testing Methods: Low Pressure Pulse Method
    • Understanding and Interpreting Technical Information and Work Instructions
    • Equipment Used in Air-Tightness Testing: Pre-Installation Checks and Calibration

Day 3: Practical Application and Evaluation

  • Morning Session:
    • Preparation for Air-Tightness Testing: Tools, Equipment, Sealing Up Leakage Points
    • Conducting an Air-Tightness Test: Steps and Strategies
    • Software Preparation and Conducting Live Supervised Tests
  • Afternoon Session:
    • Evaluating the Effectiveness of Air-Tightness Testing
    • Interpreting Test Results and Understanding Key Metrics
    • Identifying and Addressing the Locations of Air Leakage
    • Course Review, Assessment, and Feedback

Cost per Person

£875+ VAT

Personal Learner Account (PLA)

PLA will be applied for in the near future. As with all funding, it is not guaranteed.

Personal Learning Accounts | Careers Wales (


Flexible Skills Funding for Organisations 

Flexible Skills Programme | Business Wales Skills Gateway (

If you’re studying a Level 3 qualification, you might be eligible for an ‘Adult Education Budget’ grant instead of an Advanced Learner Loan. If you get a grant, you do not need to repay it. Ask your college or training provider about grants before you apply for a loan.

Advanced Learner Loan: Overview - GOV.UK (


Qualifications with NetRet Group

  • Fully Accredited and NVQs
  • Direct Certificate Claims (Quicker Turnaround)
  • Industry Recognised Assessors and Trainers
  • On Line Support
  • Dedicated Assessor & Advisor
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