Green Building Store is now 21°

Design services

We want to enable you to achieve the best you can in the context of your objectives and resources. In order to complement our existing products and our vision for the construction of low energy homes, we're offering design services to self-builders and their architects.

Man writing in a notebook and smiling

Design service

MVHR design service

21° is nationally recognised for its expertise in designing, supplying and commissioning MVHR (mechanical ventilation with heat recovery) systems for Passivhaus and low energy projects.

Our design service is qualitatively different to most other MVHR providers. As well as designing a system to physically fit in a building, we model the system in 3D software to check performance of the system in terms of noise, pressure, balance and airflow.

Design service

Low Energy Design Service

Our Low Energy Design Service aims to empower architects and self-builders during the early stages of design by providing them with informed and quantified decisions regarding the build fabric specification. This includes crucial factors that feed into a building's performance, such as U-values, windows, airtightness, and ventilation. Our approach involves generating an initial whole building energy model using the Passivhaus Planning Package (PHPP).

Design service


A practical review of your building plans with Director Bill Butcher, to help guide your project team to deliver energy efficient, up to Passivhaus standard, building projects.

Our Design Review focuses on building professionals and their clients working on domestic residential projects helping them to meet Passivhaus, EnerPHit and AECB low energy building standards.

Take a step towards a more energy efficient home today

From triple-glazed and alu-clad windows and doors to exceptional solutions to MVHR, it all starts with finding out your exact requirements.

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Life changing homes