Passivhaus Affiliate

Standard Members

Membership of the Passivhaus Trust is open to anyone and does not necessarily imply achievement of the Passivhaus standard for buildings or components, or attainment of Passivhaus-related qualifications. Members of the Passivhaus Trust listed include architects, consultants, contractors, manufacturers and other industry professionals, as well as individuals, who support the work of the Trust in promoting the Standard in the UK.

Join PHT

View Patron members

View members by category

Search map

Jackon UK Ltd



Jacqueline Bleach


Jacqueline Bleach BA(Hons)DipArchRIBA CEPH is a Chartered Architect and Certified Passivhaus Designer. Co-founder of the Ellerdine Partnership, an architectural practice based in rural Shropshire, with over 20 years experience, delivering innovative and exceptional residential design. Sustainability, together with quality design, understanding clients needs and a practical approach, inspire and are fundamental to everything.

James Galpin

Tunbridge Wells

James Galpin of Hazle McCormack Young LLP is a PassivHaus Trust member and a designer of low energy solutions for new contemporary homes, education buildings and offices, as well as retrofit projects in all three sectors. Working closely with specialist Phil Neve of Aaben, James has recently delivered a new 6 bedroom PassivHaus dwelling in Mayfield (completed August 2014) and has designed new dwellings for three sites in East Sussex, plus retrofit dwellings in Kent. In addition to designing bespoke projects for individual clients, James is also working on theories to develop the concepts of PassivHaus further to find new ways of collecting and harnessing solar energy in a controlled manner to benefit education spaces and office developments. James primarily covers the South East of England from two offices in Tunbridge Wells and Canterbury, but is happy to travel further afield for interesting projects.

James Langford Architects


James Langford Architects is an RIBA chartered practice, with particular experience delivering private residential new build and refurbishment projects. Sustainability is a key focus of JLA and the practice aligns itself with the fabric first approach taken by Passivhaus. Many of our projects incorporate energy saving measures beyond the minimum requirements of the Building Regulations and we are currently working on a residential refurbishment project with the aim of meeting EnerPHit standards.


James Robertson


Jay Lee


Jennings Aldas (2019) Ltd


Paul Jennings of Aldas is one of the most experienced airtightness tester and consultant in the UK, with over 30 years’ experience. He presents at numerous Passivhaus and AECB events in the UK and overseas. Paul has been involved in most UK Passivhaus projects to date in one or more capacities, including: • the first UK certified domestic and non-domestic PH projects in Machynlleth, initially tested in 2008, retested in 2018 • Erneley Close in Manchester, the most successful UK EnerPHit block refurbishment project to date • Agar Grove PH area regeneration in Camden, ultimately delivering more than 500 newbuild PH units • the Exeter Passivhaus swimming pool and leisure centre, currently under construction. Paul is an experienced trainer and originated the Airtightness Champion concept, as well as delivering the Airtightness Masterclass for the PHT, with Stephen Gurney. He developed the 12 Steps to Airtightness approach to enable UK contractors to reliably deliver airtightness in Passivhaus and other low-energy projects.


Jestico + Whiles



Jigsaw Design & Construction Ltd


Jigsaw Design and Construction Ltd is a Federation of Master Builders and LABC accredited, innovative and forward thinking family-run construction business based in Hertfordshire. Established in 2006, we have grown in scale and ability by investing our time and energy into learning about modern methods of construction along with our keen willingness to work with newer building materials. We have become passionate about Passivhaus in the recent years and successfully delivered our first Passivhaus project with an impressive air change rate of 0.07ACH^-1. We are looking forward to the Passivhaus philosophy of construction growing in popularity in the UK in the years to come. Our team, from office to site, is dedicated to top-quality construction and excellent customer service and we hope to have the opportunity to work with you on your Passivhaus project!


Jim Gilliland

East Yorkshire

Jim Miller Design Ltd


Jim Miller Design Ltd is a leading architectural practice based in Brighton and Hove, Sussex specialising in sustainable buildings from its inception in 2003 and now working exclusively to Passivhaus standards. Projects range from deep retrofits / EnerPHit to small housing projects with long standing relationships with local contractors proficient with Passivhaus builds. Jim Miller is a certified Passivhaus Consultant and oversees every aspect of the project ensuring excellent attention to detail throughout.


John Butler - Sustainable Building Consultancy


Certified Passivhaus Consultant. PHPP and thermal bridging calculations. Guidance, advice, consultancy. On-site tuition and training in sustainable low-energy building techniques. Whether architects needing technical support and calculations, or self-builders and commissioners seeking support through the maze of sustainability and low-energy decisions, get in touch to discuss your project and how I could help.


John Gilbert Architects


John Gilbert Architects is a Scottish design studio, passionate about designing places for people and the planet. We deliver beautiful, efficient, affordable projects designed with users, residents and the community. We undertake design work from a strategic level to detailed architecture with creativity, enthusiasm and knowledge.


John Renshaw Architects



Jon Broome Architects


Award winning practice building on 20 years of experience of ‘green’ design to incorporate affordable and trouble-free measures into the mainstream. • Designing very energy efficient buildings using Passivhaus principles • Building sustainable homes and neighbourhoods • Developing sustainable policies and briefs • Advising on sustainable construction, specifications and suppliers We bring together theory and practice to create environmentally sustainable and cost-effective housing. We have particular experience and expertise in self-help housing and timber building We believe in adaptability and a proper role for residents as necessary conditions for sustainable development


Jon Hand


Jon Hand is a certified trainer for Passivhaus workshops and has taken part in eight workshops with over 200 participants within the University of Strathclyde in Glasgow as well as advising several groups in South Korea on PH issues. When not involved in PH activities Dr. Hand develops and deploys detailed numerical analysis tools and techniques within the Energy Systems Research Unit of the Department of Mechanical and Aerospace Engineering. For two decades he was also a registered Architect and continues to be shocked by the designed-for-failure he sees in many conventional construction documents.

Jon James Studio Architecture


Jon James Studio Architecture is based just outside Cowbridge in the Vale of Glamorgan, Wales. Jon James founded the studio which is grounded in sustainable design. Jon is a highly experienced architect and the studio works across all sectors and specialises in residential and education Passivhaus design. Jon has won many awards for his buildings over the years and has a strong reputation for being able to work closely with his clients to create and deliver buildings that not only meet their individual requirements but exceed their expectations. Jon, a certified Passive House Designer and Conservation Architect, has a passion for conservation architecture and sustainable, quality design.


Jones King Partnership


Jones King Partnership is a leading Building Services Design Engineering Consultancy with over 30 years’ experience and we are proud of our strong track record and dynamic team working with clients across a broad spectrum of sectors. As a company Jones King Partnership understands the importance of enhancing the value of mechanical and electrical design in buildings, expertly combining collaborative working and client engagement whilst keeping commerciality in focus. We provide expert guidance in relation to diverse Sustainability assessments that are often an integral part of a project.


Josko Fenster und Turen GmbH

Kopfing, Austria


JR Construction (Scotland) Ltd


The JR Group are a family run business, who have been operating across Scotland and the North of England for over 25 years. Our 200 strong workforce operate in five distinct areas including scaffolding, construction, specialist services, DC Timber Systems and JR Homes - a private homes division. Our unique business portfolio allows us to offer a holistic service to many of the UK’s leading house builders, registered social landlords and private developers, as well as delivering retail, commercial and leisure projects.


Julian Bishop - Architect



Justin Murray