Collective Energy is a specialist division within Collective Architecture, established in 2020, to offer key services and advice around how to make buildings, places, processes and communities more sustainable and effective.

We work with clients, consultants and collaborators to develop their projects, methods and ideas to be climate neutral, socially sustainable and holistic. This includes meeting the necessary drive to Net Zero Carbon, developing regenerative and circular models, reducing energy demands, taking a fabric first approach and closing the performance gap.

Key services provided are:

Passivhaus Design Services:
Fully accredited Passivhaus design services for all building types, scales and locations.

Circular Economy Consultancy:
Holistic consultancy services on the benefits and opportunities of the circular economy in construction.

Building Performance Services:
Range of specialist services and strategies to determine and assess building/site performance and compliance for new and existing.

The urgency with which the construction industry – and society at large - must address the climate emergency and wider sustainability is critical. At Collective Energy we apply skill, ingenuity and creativity to meet this need.


The Collective Energy team works across Scotland on a wide variety of projects, from small bespoke project installations to large scale regenerations. They have specialist skills in several areas, most notably Passivhaus design Circular Economy Consultancy and Building Performance.

Carl Baker
Architect | Passivhaus Designer

Carls joined Collective Architecture in 2018, having worked at 7N on the prestigious Knab Masterplan in Lerwick. He has continued developing these strategic skills to think about sustainability more holistically on all his projects. He has recently qualified as a Passivhaus Designer and is driven to help clients get as close to net zero as possible.

Mairi Laverty
Employee Elected Director | Architect | Passivhaus Designer

Mairi has led several complex, socially inclusive projects across Scotland, including the Larick Centre, Tayport (Scottish Design Award Commendation); the Water Row Development in Govan, Glasgow; Bilbohall Masterplan in Elgin; Sighthill Housing, Glasgow and plans for the Camphill Community/Estates, Aberdeen. Mairi recently won 'Young Architect of the Year' due her ability to balance exceptional design with the skills required to bring clients, communities, consultants and contractors on the journey to delivering high quality projects. She has recently gain her qualification as a fully certified European Passivhaus Designers.

Emily Ong
Architectural Assistant (Part 2) | Passivhaus Designer

Emily joined Collective Architecture in 2019 and has been working on a variety of projects, from small-scale energy retrofit to large-scale Passivhaus housing project. Passionate about sustainable architecture, she has recently qualified as a certified Passivhaus Designer and continued developing interest and knowledge in sustainable solutions to tackle future energy challenges of meeting global demand.

Chris Stewart
Director | Architect | Circular Economy Adviser | Passivhaus Designer

Chris leads the Collective Energy team in the field of Circular Economy and Deconstruction. He is the co-founding director of Collective Architecture and established the practice 23 years ago, based on principles of sustainability and participation. He is a key member of Scottish Ecological Design Association and the RIAS Sustainability Working Group.

James York
Architect | Passivhaus Designer

James's expertise in sustainable design allows him to offer practical design solutions that minimise environmental impact, reduce energy consumption and enhance overall building performance and wellbeing. He has extensive experience in the design and delivery of conservation, retrofit & new build projects and has a keen interest in strategic planning to meet net zero carbon targets.

Carl Baker Carl Baker - Architect | Passivhaus Designer Email
Cathy Houston Cathy Houston - Architect | Post Graduate Certificate Advanced Sustainable Design Email
Mairi Laverty Mairi Laverty - Architect, Passivhaus Designer Email
Emily Ong Emily Ong - Architectural Assistant (Part 2) | Passivhaus Designer Email
Chris Stewart Chris Stewart - Director | Architect | Circular Economy Adviser | Passivhaus Designer Email
James York James York - Architect | Passivhaus Designer Email


We are always keen to hear from exceptional and enthusiastic applicants who have excellent design and technical ability.

You can submit your CV to

Collective Architecture is committed to being transparent about how it handles your personal information, to protect the privacy and security of your personal data and to meeting its data protection obligations under the General Data Protection Regulation (“GDPR”) and the Data Protection Act 2018. You will find our full GDPR privacy notice for applicants below.

GDPR Privacy Notice for Applicants
GDPR Privacy Notice for Applicants Download PDF

Accreditations, Certifications and Specialisms


Chris Stewart - RIAS Sustainability Accredition

Air Tightness Testing:

Connor Milton


UKAS ISO 9001:2015 Quality Management
UKAS ISO 14001 Environmental Management
We are working towards: B Corp Certification

Certified Drone Pilot:

Drone Licence with Permission for Commercial Operation (CAA): Connor Milton

Certified Passive House Architects / Designers:

Carl Baker, Mairi Laverty, Emily Ong, David Perez, Chris Stewart, Eugenia Mompo and James York.



Scottish Homes Award
Best Renovation Project
Bells Street Stables


Glasgow Institute of Architects
Winner - Sustainability and Conservation Award
Bells Street Stables


CIH Scotland
Excellence in Regeneration
Anderston Phase 4&5

Glasgow Institute of Architects
Winner - Sustainable Award
Dougrie Terrace

AJ Retrofit Award
Finalist - Cultural Project
Paisley: The Secret Collection


Glasgow Institute of Architects
Commendation - Conservation Category
Paisley Community Safety Hub

Scottish Civic Trust Awards - My Place Award
Highly Commended
Glasgow Women's Library


Scottish Design Awards
Sustainable Design Award - Commendation
Garscube Road and Hopehill Road


Scottish Design Awards
Sustainable Design Award - Commendation
Garscube Road and Hopehill Road

Social Home Awards
Environmental Excellence - Commendation
Garscube Road and Hopehill Road


Glasgow Institute of Architects
Residential Category - Commendation
Castle Street, Rothesay

Herald Property Awards
Property Innovation of the Year
Govan Gateway

Scottish Design Awards
Sustainable Design Award - Commendation
Garscube Road and Hopehill Road


Sustainable Social Housing Consultancy Of the Year
Finailist - Collective Architecture


Glasgow Institute of Architects
Sustainability Award
Collective Architecture

Sustainable Social Housing Consultancy Of the Year - Finalist
Collective Architecture


Blochairn Housing Association
Clyde Gateway
Collective Gallery
East Dunbartonshire Council
Fyne Homes
Glasgow and Clyde Valley Green Network Partnership
Glasgow City Council
Glasgow Housing Association
Govanhill Housing Association
Home Group Ltd
Hub South West
Hub West
Keepmoat Regeneration
Lanarkshire Housing Association
Link Group
Loretto Housing Association
Maryhill Housing Association
North Lanarkshire Council
Parkhead Housing Association
Partick Housing Association
Port of Leith Housing Association
Queens Cross Housing Association
Robertson Partnership
Sanctuary Homes
Sanctuary Scotland Housing Association
Scottish Canals
North Lanarkshire Council
Tayport Community Trust
The City of Edinburgh Council
West of Scotland Housing Association
Wheatley Group
Zero Waste Scotland


Our staff are involved in a number of areas of research through practice and teaching;


Woodside Multi Storey Flats - 'Fresh-R' MVHR Testing