Passive House

Airtight Home Standards 

Passive House Blower Door Test

At MBC we design for and test all our passive house builds for air-tightness using the blower door test. Passive House Air Tightness is measured in Air Changes Per Hour (AC/hr) allowing for 50Pa pressure difference between internal air and external air. An air permeability result of less than or equal to 0.6 AC/hr is required to satisfy Passive House Blower Door Test standards

Blower Door System

How the Passive House Blower Door Test Works

This test method uses a pressurised calibrated gauge that measures the rate of airflow between building zones and internal and external faces. This is achieved by mechanically lowering the air pressure within a building in a controlled manner. The blower door fan essentially creates a vacuum effect, which forcibly draws de-pressurised air out of the building at a specific rate. Passive House Blower Door Test results greater than 0.6 AC/hr are typically as a result of an air leak that has breached the buildings airtight envelope. These leaks are identified by means of a simply smoke test, allowing air leaks to be mitigating quickly and retesting to be carried out.  

Discuss your project with us

MBC specialise in the production of Timber Frame Passive House Buildings and High Thermal Efficiency Timber Frame Houses throughout the UK, Fulfil your dream of a self built home and benefit from huge energy savings and reduce their heating demands by up to 90%. 

Passive Builds

Passive Builds

Precisely engineered Passive solutions from MBC Timber Frame requiring 90% less energy for space heating and cooling.

Near Passive

Near Passive Builds

MBC Timber Frame’s “optional levels of insulation” applied to a 140mm stud frame. 3 great options delivery differing U-Values.

Passive Foundation

Passive Foundations

The MBC Passive Foundation system, suitable for both Passive and Standard timber frame projects.


Truss and Joists

Metal web Joists and Roof Trusses available on a supply only basis for traditional build projects.

A super insulated, timber frame house, providing exceptional energy efficiency for your new home, using the best timber available

Designed and engineered in accordance with current building regulations, perfect for you self builders

Manufactured in a controlled factory environment, ensuring superior quality craftsmanship

An affordable, competitively priced building option using our timber frame kits creating luxurious living space

Erected on site at an unparalleled rate when compared to conventional block construction

An environmentally conscious and forward thinking sustainable approach for your new dream home

Get in touch with MBC Timber Frame

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