How Much Does A Building Air Tightness Test Cost In Ireland?
- Sean Collins
- 7 days ago
- 4 min read
When it comes to building modern, energy-efficient homes and commercial properties, Building Air Tightness Testing is no longer optional. It is a requirement. In Ireland, airtightness testing plays a critical role in ensuring compliance with Part L of the Building Regulations, while also helping developers, builders, and homeowners reduce energy bills and achieve higher BER ratings. One of the most common questions people ask is this: “How much does a building air tightness test cost in Ireland?”
In this article, we will explain everything you need to know about airtightness testing costs, what factors influence the price, and why this investment pays for itself in energy savings and building performance.
What Is Building Air Tightness Testing?
Building Air Tightness Testing, also known as a blower door test, measures the amount of uncontrolled air leakage through gaps, cracks, and weak points in the building envelope.
During the test, a calibrated fan is temporarily fitted into an external doorway. The fan pressurises and depressurises the building, while monitoring equipment records how much air is leaking in or out. The results are given in terms of air changes per hour (ACH) or air permeability (m³ per hr per m² at 50Pa).
This matters because excessive air leakage means higher heating and cooling costs, reduced comfort for occupants, increased risk of condensation and mould, and difficulty achieving compliance with Part L, along with a lower BER rating.
That is why Building Air Tightness Testing has become a standard step in Ireland’s construction process.
Is Building Air Tightness Testing Mandatory in Ireland?
Yes. For new builds, airtightness testing is required under Part L (Conservation of Fuel and Energy) of the Building Regulations.
For dwellings, at least one test must be carried out for every development, with larger schemes requiring a specific percentage of homes tested. In practice, many builders now test all units to avoid delays or compliance risks.
For non-domestic buildings, air tightness testing is mandatory for most new commercial buildings over a certain floor area. Even when it is not legally required, testing is often performed voluntarily to improve energy efficiency and to future-proof properties.
How Much Does Building Air Tightness Testing Cost in Ireland?
The cost of a Building Air Tightness Test in Ireland can vary depending on a few key factors. On average, you can expect to pay:
Around €250 to €350 for a standard airtightness test on a single dwelling
Around €400 to €600 or more for larger or more complex residential buildings
€500 and upwards for commercial buildings, depending on floor area and design complexity
However, these prices are only guidelines. The actual cost depends on several factors.
Size of the Building
Larger homes or commercial units require more time and more powerful equipment to carry out accurate testing, which increases cost.
Complexity of Design
Buildings with unusual layouts, multiple zones, or many penetrations, such as apartments or offices, take longer to test and may require additional setup.
Location of the Building
Travel distance can affect cost, especially for one-off tests in rural or remote areas.
Number of Tests Required
Builders often book multiple airtightness tests across a development. In these cases, bulk pricing usually applies, reducing the cost per unit.
Preparation and Retesting
If the building fails the initial test, retesting is necessary after sealing up identified leakage points. While this adds to the overall cost, it ensures compliance and long term efficiency.
Why Building Air Tightness Testing Is Worth the Investment
While the cost may seem like just another line item in a construction budget, the benefits far outweigh the expense.
Compliance with Regulations
Without airtightness testing, you risk failing Part L compliance. This could delay completion, BER certification, and the sale or rental of the property.
Energy Savings
A well-sealed home or building reduces heating bills significantly. Airtightness improvements can cut energy use by up to 20% to 30%, saving thousands over the building’s lifetime.
Improved Comfort
Less draught means more consistent indoor temperatures and a healthier indoor environment.
Higher Property Value
Homes with proven airtightness and better BER ratings are more attractive to buyers and tenants.
How to Prepare for a Building Air Tightness Test
Proper preparation can help you avoid costly retests. Before booking your Building Air Tightness Testing, make sure that:
All windows and doors are installed and properly sealed
Service penetrations such as pipes, cables, and ducts are sealed
Loft hatches, sockets, and skirting boards are sealed
Chimneys, flues, or ventilation openings are temporarily sealed where appropriate
A qualified airtightness tester will often provide a pre-test checklist to help you catch leaks before the official test.
Building Air Tightness Testing with Forsah
At Forsah, we deliver professional, accurate, and fully compliant Building Air Tightness Testing throughout Ireland.
Why builders, developers, and homeowners choose us:
Certified testing to meet Part L regulations
Cost-effective solutions with competitive pricing
Experienced team with expertise in both residential and commercial projects
Fast turnaround and clear reporting for BER assessors
Guidance on remedial works to help you pass the test the first time
Whether you are a one-off homeowner, a developer managing multiple units, or a contractor working on a large commercial project, we provide reliable airtightness testing tailored to your needs.
Conclusion: What to Expect on Cost
The cost of Building Air Tightness Testing in Ireland generally ranges between €250 and €600, depending on building type, size, and complexity. While it may feel like an additional expense, airtightness testing ensures regulatory compliance, improves energy efficiency, and adds long term value to any property.
At Forsah, we make the process straightforward, affordable, and effective. You can have peace of mind that your building is compliant, efficient, and future ready.
Ready to Book Your Building Air Tightness Test?
Contact Forsah today to get a competitive quote for Building Air Tightness Testing in Ireland. Our expert team will guide you every step of the way, from preparation to certification. Get in touch for a consultation today - info@forsah.ie
Comments