Our Construction System

Generous amounts of recyclable, stone wool is firmly packed within our panels – far exceeding the insulation quantities found in average new builds. Similar to a giant woolly jumper, it curbs heat loss and keeps your home cool in summer. The thick insulation also acts as a barrier against external noise, ensuring your home remains calm and quiet.

To achieve the Passivhaus standard, your home must be enveloped in a single, continuous airtight layer. The Coldwells Build Passivhaus achieves this by incorporating a durable airtight board that wraps around our wall panels and roof cassettes. Any small gaps between the boards are carefully taped and sealed to stop heat escaping and wasting energy. This translates to a cosy indoor environment, free from:

• Draughts
• Cold spots
• Overheating

It also stops moisture and humidity building up, preventing mould and extending the life of your Passivhaus. We've opted for airtight boards in our construction system because they offer greater durability compared to other options like airtightness membranes. This helps minimise the risk of follow-on trades inadvertently piercing the airtightness layer.

With a sturdy wall thickness of 500mm, the Coldwells Build Passivhaus Panel’s robust and detailed construction makes it unique in its ability to overcome challenging climates. Whether on a snow-prone plot, or an exposed coastal site, your home is guaranteed to keep you comfortable and meet the world-leading Passivhaus standard. 

Typically the wall, roof and floor elements in a Passivhaus should aspire to a U-value between 0.10 W/m².K to 0.15 W/m².K. The Coldwells Build Passivhaus Panel eclipses this, with a market-leading U-value ranging from 0.085 W/m2.K to 0.09W/m2.K. When it comes to energy-efficient construction, it doesn’t get better than this. 

External timber cladding and high-performance windows and doors are pre-installed in the Coldwells Build Passivhaus Panels before being delivered to your site. This allows for speedy assembly, with the external shell of your home craned into position and complete in days.

To limit our environmental impact, we've significantly reduced the use of high embodied carbon materials like cement and steel, opting instead to increase our use of sustainably-sourced timber. Our choice of natural, hard-wearing timber exteriors not only ensures durability, but also helps us achieve a much lower carbon footprint compared to the blockwork and render commonly found in modern housing.