Low Energy Buildings

Improving the energy performance of buildings and cutting carbon emissions has been a key focus for the Government in recent years. The target is a national 80% reduction in carbon emissions by 2050.

The window industry has responded to the demand for improved energy efficiency. Innovative product like SWISSPACER's ULTIMATE spacer bar ensure better energy savings from more energy efficient double and triple glazed windows.

Specifying the best thermal performing warm edge spacer bar can make a significant difference to the carbon footprint and energy efficiency of your project.

In new or social housing refurbishment, or large scale commercial projects SWISSPACER’s performance lasts so your energy and cost savings continue year after year.

The Passivhaus Standard

Passivhaus is the world’s fastest growing energy performance standard. The aim of the standard is to build homes with excellent thermal performance, exceptional air tightness and mechanical ventilation to reduce the ecological footprint.

Passivhaus can be applied to residential, commercial, industrial and public buildings, and windows need to have a U-Value of 0.8W/m²K or less.

SWISSPACER is the ideal choice for Passivhaus windows. According to the Passivhaus institute in Germany, around 70% of Passivhaus windows, 86% of windows with fixed glazing and 97% of  Passivhaus curtain wall constructions are made with SWISSPACER. The average Psi-value for certified Passivhaus windows with SWISSPACER is 0.028 W/mK, but values as low as 0.020 W/mK have also been recorded with SWISSPACER.


AIMC4 is a £6.4m project funded by consortium partners and the Government-backed Technology Strategy Board (TSB). The consortium members are: Stewart Milne Group, Crest Nicholson Plc and Barratt Developments Plc, plus H+H UK Ltd and the BRE.

The project’s aim is to develop and build energy efficient homes to Code Level 4 by utilising a fabric-first approach without the use of renewables.

BREEAM Certification

BREEAM is the world's foremost environmental assessment method and rating system for buildings. It sets the standard for best practice in sustainable building design, construction and operation. It has become one of the most comprehensive and widely recognised measures of a building's environmental performance.