Case Study: Cotswold new build is 100x more airtight than Building Regs and 6x more airtight than Passivhaus

It’s subtle and understated in its impact on UK housing, but this new build bungalow home is one of the most energy efficient buildings in the world, and represents the future of housebuilding in the UK and Europe. We pressure… Continue reading

How airtightness testing differs between Building Regs and Passive House – and why it matters so much

Using a smoke pen to detect leaks during airtightness testing

Building Regulations Part F wants to know how much air (in m3hr) passes through each metre square area of the fabric (m2). This is the Air Permeability (AP or m3.hr/m2) figure of the building. To get the AP figure, one… Continue reading

How much does an MVHR or heat recovery ventilation cost to buy and install?

how-much-does-an-mvhr-fully-installed-cost

If you’re building or renovating to energy efficient, high comfort and healthy air quality standards and you and your contractor are working hard to make sure the building fabric is as airtight as possible, you will need mechanical ventilation in… Continue reading