Air Tightness Testing Training

Stroma offers a range of air tightness testing training courses, including ATTMA Level 1 and ATTMA Level 2, to determine the competence and capabilities of air tightness testers.

There are several levels of competence defined by the Department for Communities and Local Government for air tightness testing. These levels are defined in a Minimum Technical Competence (MTC) documents which identifies the National Occupational Standards (NOS) applicable for each level. This is available to download from ATTMA.

Level 1

Level 1 is the entry level for new air tightness testers, allowing them to test single dwellings and small, simple buildings with a single fan. Stroma provides a 4 day course of theory and practical training and examinations to enable delegates to register as a Level 1 tester on the ATTMA scheme.

Course content

Days 1 – 3: Classroom

Covering the NOS documents as required by the MTC for a Level 1 tester: ASTATT1, ASTATT2, ASTATT3, ASTATT4, ASTATT5, ASTATT6, ASTATT7, ASTATT8 and ASTATT9.

Day 4: Examinations

  • Multiple choice theory exam
  • Envelope are calculation exam
  • Practical air tightness test exam

Report review

After successful completion of the course, candidates are required to carry out 3 air tightness tests with full reports and calculations. Once the acceptance of these reports has been confirmed and you pass this review, you will be referred for registration to the ATTMA competent person scheme.

Download our flyer for further information on ATTMA Level 1 Training.

Book your place.


Level 2

Stroma provides the Level 2 training course for testers who are registered on the ATTMA competent person scheme as a Level 1 tester and test non-simple buildings.

Level 2 is a modular course designed to progress air tightness testers from Level 1, or to allow delegates to register as Envelope Area Calculations Technicians. The Envelope Area Calculation Technician module is for individuals who are authorised to carry out envelope area and volume calculations but are not authorised to tese.

Course content

Module 1: Basic Envelope Area Calculations

A refresher module in 3D modelling of simple envelope areas and volumes.

Module 2: Advanced Envelope Area Calculations

Covering advanced envelope area calculation techniques needed for Level 2 testing, including circles, ellipses and curves, multiple angled pitch roof interfaces and tapering on plan with a pitched roof.

Module 3: Multi-Fan Testing

Covering the testing of larger and more complicated buildings with multiple fans. Specific topics include how to test larger buildings with multiple fans permanently compartmentalised buildings and large extensions to commercial buildings.

Module 4: Multi-Fan Practical

The application of the information covered in Module 3.


A practical exam, involving the testing of a larger commercial building and a theory exam which is a multiple choice paper on key topics covered in Modules 3 and 4.


Download our flyer for further information on ATTMA Level 2 training.

Book your place.


Level 3

Level 3 is for testers who have achieve Level 1 and Level 2 and test large and complex high rise and phased handover zonal buildings. It enables testers to test any building. Level 3 must be attained through a technical interview and the submission of a report detailing advanced, technical and applied knowledge and understanding.


Get in touch

More information on ATTMA and Air Tightness Tester training can be found on the ATTMA website.

If you would like any further information regarding our training courses, please don’t hesitate to contact our team. Leave your details on our quick contact form or contact us page and we’ll get back to you as soon as possible, or call us directly on 0845 621 2222.


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