AECB Approved Certifiers and Modellers
Please visit our certifiers page if you wish to see the qualifications and criteria that AECB Approved Certifiers and Modellers must meet.
Whilst we are setting up the certifiers scheme you may wish to contact us to discuss certification services.
We have a large number of interested potential AECB Approved Certifiers and we anticipate the scheme will be running from the end of April 2023.
We will add certifier profiles below as we secure confirmation of their status.

Keri Barr
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Keri Barr
Services as a Certifier/Modeller
At Keri Barr Architects we especially enjoy making happier and smarter spaces; with plenty of natural daylight and greenery. Our design focus is on the people, site, climate, context and materials – to produce spaces that are enjoyable to use and healthy to occupy. We are specialists in retrofit and low carbon construction.
Relevant Experience
We work on private homes, often extending and remodelling them in conjunction with staged or full thermal upgrades - always with the health of the building as well as the health of the occupants in mind.
Qualifications
Chartered Architect – ARB & RIBA
Certified Passivhaus Designer – CEPHD
AECB CarbonLite Retrofit graduate
Regions or towns/cities to carry out AECB certification services
Hertfordshire, Buckinghamshire, Bedfordshire, North London
Contact Email Address

Tom Reynolds
AECB Approved Certifier: Building Standard & Modeller
AECB Approved Certifier: Tom Reynolds
Services as a Certifier/Modeller
Experienced building energy and carbon modeller with experience of PHPP, IES Apache, & SAP. Highly experienced in Psi-Value calculations, condensation risk calculations and embodied carbon/whole life cycle assessments.
Relevant Experience
Tom has been using PHPP since 2009 and have acted as modeller and consultant on a number of schemes that have progressed to full certification. These have included self-build and larger scale social-housing schemes.
Qualifications
ABBE Level 4 thermographer (PCN Level 2 equivalent)
OCDEA and Member of the Chartered Institute of Building
Regions or towns/cities to carry out AECB certification services
Nationwide
Contact Email Address
tom.reynolds@mesbuildingsolutions.co.uk

James Rixon
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: James Rixon
Services as a Certifier/Modeller
Rixon Architecture specialises in retrofit and low energy design working both independently or alongside other consultants to deliver low carbon construction projects.
Relevant Experience
As both Architects with passivhaus training and Retrofit Coordinators we have worked delivering retrofit for small and large schemes.
Qualifications
Chartered Architects - ARB/RIBA
Level 5 Diploma of Retrofit Coordination - STROMA / Trustmark
AECB CarbonLite Retrofit Graduate
Certified Passivhaus Designer
Regions or towns/cities to carry out AECB certification services
London, Cambridge and the South East
Contact Email Address

Patrick Osborne
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Patrick Osborne
Services as a Certifier/Modeller
Patrick has worked on a number of Passivhaus and Low Energy Buildings over the last decade, and can provide PHPP and design advice as appropriate.
He can also produce thermal bridging details and optimization for new build and retrofit projects.
Relevant Experience
I have worked on Certified Passivhaus projects (4 Hiley Road London, Lucy Cavendish college) and currently Passivhaus Designer for a new apartment block in Worthing. I have also produced a number of PHPP models, and was Project Architect for 3 school staged retrofits for Lewisham Council.
Qualifications
Chartered Architect
Certified European Passivhaus Designer
AECB CarbonLite Graduate
Level 5 Diploma in Retrofit Coordination and Risk Management
AECB RIBA and ARB Member
Regions or towns/cities to carry out AECB certification services
South East England
Contact Email Address

Camilla Govan
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Camilla Govan
Services as a Certifier/Modeller
Camilla is working independently but enjoy collaboration with architects and builders and enabling better buildings. I am interested in looking at how to use less toxic materials, while keeping a focus on thermal performance. I see modelling as a powerful design tool. Do contact me an an early stage.
Relevant Experience
I am a recently qualified Passivhaus Consultant and AECB CarbonLite Retrofit graduate who has been involved in Passivhaus & advising on airtightness and thermal bridging for over 10 years. I helped to deliver the initial AECB CarbonLite course in 2016 & worked for Green Building Store 2009-22.
Qualifications
Certified Passivhaus Consultant
AECB CarbonLite Retrofit graduate
Member of the Passivhaus Trust
AECB RIBA and ARB Member
Regions or towns/cities to carry out AECB certification services
Huddersfield, Bradford, Leeds, Manchester
Contact Email Address

Dushyant Karnik
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Dushyant Karnik
Services as a Certifier/Modeller
I am a sustainability and environmental design professional. Experienced in new build /retrofit residential/commercial buildings, decarbonisation of historic university buildings, energy and net zero strategies, building services & fabric consultancy and building performance modelling.
Relevant Experience
I have worked on several Passivhaus/EnerPHit/AECB Building standard projects across the UK. I believe in designing using the fabric first approach to deliver net zero developments while maintaining a balance between energy reduction, occupant comfort and wellbeing.
Qualifications
Bachelor of Architecture, MSc. Construction Management,
Certified European Passivhaus Designer,
AECB CarbonLite Retrofit Graduate
Regions or towns/cities to carry out AECB certification services
London, Oxford, Bristol, Cambridge, Norwich and South East England
Contact Email Address
dushyant.karnik@qodaconsulting.com

Shweta Salvankar
AECB Approved Certifier: Building Standard & Modeller
AECB Approved Certifier: Shweta Salvankar
Services as a Certifier/Modeller
We specialise in Passivhaus planning for New builds and Enerphits. Services include design analysis, energy performance assessment, carbon footprint calculation, thermal modelling, and material/system selection. Our Passivhaus strategy can optimize building energy results even in concept stage.
Relevant Experience
As a Sustainability Consultant and Passivhaus modeller I have expertise in Retrofitting homes and modelling buildings to comply with highest standards of energy efficiency. Our team excels in reporting and implementing the most cost-effective and low carbon measures for Welsh housing projects.
Qualifications
Msc. Environmental Design of Buildings
CPD Cert. Building Energy Modelling using PHPP
CIBSE BSG Young Modeller Award winner 2022
CIBSE Building Simulation Group
IES VE & One click LCA
Regions or towns/cities to carry out AECB certification services
UK & Ireland
Contact Email Address

Sarah Price
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Sarah Price
Services as a Certifier/Modeller
My aim is to achieve the best building for people and our environment within the constraints of each project. We can offer AECB Consultancy and Certification, Passivhaus Consultancy & Certification and a range of complimentary building physics & net zero carbon services.
Relevant Experience
I have worked on over 90 certified Passivhaus dwellings across the country including the first Passivhaus leisure centre, and the construction stage of the largest Passivhaus development in the UK. I'm also a Retrofit Coordinator and Technical Author for PAS 2035/2030.
Qualifications
Passivhaus Consultant & Certifier
AECB Retrofit Consultant & Certifier
Retrofit Coordinator
CEng IMECHE
PhD Physics
Regions or towns/cities to carry out AECB certification services
UK
Contact Email Address
sarah.price@qodaconsulting.com

John Stack
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: John Stack
Services as a Certifier/Modeller
I am an Architect and PassivHaus Designer who has been involved in retrofit of existing dwellings since 2010. For the past few years my focus has been on whole house retrofit including the retrofit of historic / Listed buildings.
Relevant Experience
Refurbishment of traditionally built properties via IWI, EWI, retrofitting of roof and floor construction; Low energy heating system and low energy services.
Qualifications
PassivHaus Designer
AECB CarbonLite Graduate
AECB Retrofit Co-ordination Graduate
Enrolled on Level 5 Diploma Retrofit Co-ordination and Risk Management
Regions or towns/cities to carry out AECB certification services
London/South East
Contact Email Address
Jonathan Davies
AECB Approved Certifier: Building Standard & Modeller
AECB Approved Certifier: Jonathan Davies
Services as a Certifier/Modeller
As part of Spring Design Consultancy, I am able to offer energy modelling and certification of projects targeting the AECB CarbonLite Standard.
Relevant Experience
I was an architectural designer and energy modelling consultant on Parc y Rhodyn, the first off-grid certified Passivhaus in the UK. My focus at Spring is to reduce the heating demand and carbon intensity of social housing.
Qualifications
Certified Passive House Designer
BDesArch(Hons I + Medal), MArch
AECB Member, PHT Member, SBUK Founding Member
Regions or towns/cities to carry out AECB certification services
South West England, Wales
Contact Email Address
jonathan.davies@spring-consultancy.co.uk
Eric Fewster
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Eric Fewster
Services as a Certifier/Modeller
I have been specialising in planning deep retrofits since 2013. My work involves site surveys, PHPP modelling, thermal bridge modelling, costing, coordinating with other specialists (moisture, structural, ventilation, heat pump), and project management.
Relevant Experience
I have worked on more than 60 projects at different levels and types, from full master planning to EnerPHit level, to being part of the builder team on site daily for months, to advising architect firms on PHPP or thermal bridge details.
Qualifications
Certified European Passivhaus Designer
AECB CarbonLite Graduate
Chartered Water & Environmental Manager
Chartered Environmentalist
Regions or towns/cities to carry out AECB certification services
Nationwide
Contact Email Address
Mark Siddall
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Mark Siddall
Services as a Certifier/Modeller
Whether it is a new build or a retrofit, as an AECB certifier I provide:
Design reviews and advice
Site inspections and reports
PHPP calculations
2D Thermal bridging calculations
Relevant Experience
Architect with over 30 years experience
Passivhaus Designer with over 14 years experience
Technical advisor to the AECB and Passivhaus Trust
Author of peer reviewed guidance, articles and papers on building performance
Completed over 30 Passivhaus dwellings
Certified 12 AECB Building Standard
Qualifications
Passivhaus Designer
Architect: BA (hons), BArch
HNC Building Studies
ONC Building studies
Passivhaus Trust
AECB
RIBA
Regions or towns/cities to carry out AECB certification services
Large projects (>£1m) National , Small projects: North East England
Contact Email Address
Jaime Moya
AECB Approved Certifier: Building Standard & Modeller
AECB Approved Certifier: Jaime Moya
Services as a Certifier/Modeller
In addition to AECB CarbonLite Standard certification & modelling, Jaime provides design consultancy services. These services include spatial and envelope design, specification & review alongside PHPP modelling and review for cost-effective solutions to both new and retrofit low energy housing.
Relevant Experience
A Chartered Architect for over 20 years, Jaime has over 25 years of experience in estate regeneration & housing. Jaime is an expert in the technical & regulatory framework for social housing & has advised Welsh Govt on a heating demand based compliance approach to energy efficiency for new homes.
Qualifications
Registered Architect (ARB)
Chartered Architect (RIBA)
Certified Passive House Designer
AECB CarbonLite Graduate
AECB Member
Regions or towns/cities to carry out AECB certification services
All Wales, Midlands, South West of England & M4 corridor
Contact Email Address
jaime@spring-consultancy.co.uk
John Butler
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: John Butler
Services as a Certifier/Modeller
Enabling low-carbon high-comfort building and retrofit.
AECB modelling and certification.
Passivhaus/EnerPHit modelling and consultancy.
Guidance, advice, consultancy, energy and whole-life carbon calculations for architects, self-builders and commissioners.
Relevant Experience
Hands-on experience of retrofit and new-build, combined with technical knowledge of materials, thermal comfort, building physics, and environmental impact of construction. Evidence led decisions, testing assumptions, and ensuring the best solution for clients, their buildings and the environment.
Qualifications
Certified Passivhaus Consultant
AECB CarbonLite Retrofit Foundation course
MSc Sustainability Adaptation and the Built Environment
Member of: Passivhaus Trust, iPHA, AECB
Regions or towns/cities to carry out AECB certification services
Where site visits are required: South/South-west of England. Nationally where site visits not required.
Contact Email Address
john@sustainablebuildconsultancy.com
Gervase Mangwana
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Gervase Mangwana
Services as a Certifier/Modeller
Gervase uses PHPP and SAP based tools for creating as found baseline energy models of retrofit projects.
Then create several scenarios of possible options to help them choose their retrofit path. Including the longer term potential of the property as apart of a whole house plan.
Relevant Experience
Gervase has been doing building energy models since 2011 using SAP based tools. He has helped Carbon Co op develop the SAP based tool now used by People Powered Retrofit and others. Since CEPH qualification in 2019 he has used PHPP for many clients where greater degree of specificity and/or overheating is needed.
Qualifications
Passivhaus designer qualified 2019
Elmhurst Airtightness tester
Passivhaus Trust Member
AECB member
CarbonlLte Retrofit Course qualified 2017
MSc Renewable Energy and Built Environment
Regions or towns/cities to carry out AECB certification services
Within 150 miles of Hereford
Contact Email Address
info@waxwingenergy.co.uk
Mitchell Finn
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Certifier: Mitchell Finn
Services as a Certifier/Modeller
Certification to AECB Standard and AECB Retrofit Standards.
At Greengauge we can provide additional services including:
Passivhaus consultancy/certification
Thermal bridging calculations
SAP modelling
M&E consultancy
Overheating assessments
Relevant Experience
I have worked on many Passivhaus and AECB Building Standard projects across the UK, including complementary services such as overheating assessments, thermal bridging calculations and SAP calculations.
Qualifications
Certified Passivhaus Consultant
Retrofit Coordinator
On Construction Domestic Energy Assessor
Non Domestic Energy Assessor
Regions or towns/cities to carry out AECB certification services
UK wide
Contact Email Address
mitch@ggbec.co.uk
Grant McCowan
AECB Approved Modeller .................................................................................................................................................................................................................
AECB Approved Modeller: Grant Mccowan
Services as a Modeller
Site surveys, PHPP modelling, costing, coordination with other specialists (moisture, structural, ventilation, heat pump), project management, design and coordination based on PAS2035.
Relevant Experience
Architectural Technologist, experienced in design and project management, qualified as a Passivhaus Designer in 2021, on the AECB CarbonLite Retrofit Coordinator Course and providing retrofit advice collaboratively.
Qualifications
Architectural Technology Bsc (hons)
Passivhaus Designer
Regions or towns/cities to carry out AECB certification services
Dundee and Angus; Perthshire; Fife
Contact Email Address
grant@rtrfit.com
Konstantinos Megagiannis
AECB Approved Certifier: Building Standard, Retrofit Standards & Modeller
AECB Approved Modeller: Grant Mccowan
Services as a Certifier & Modeller
As a professional in the field of sustainable design, I am experienced in new build /retrofit residential/commercial buildings, energy strategies, building services, and embodied carbon. I specialise in fabric consultancy and have extensive experience in moisture risk assessments.
Relevant Experience
I have worked on numerous Passivhaus and EnerPHit projects across the UK. I have provided specialised consultancy related to assessing moisture risks in projects varying from residential to historic university buildings and product development and have co-authored peer reviewed guidance.
Qualifications
Passivhaus Consultant/Designer
AECB CarbonLite Retrofit Graduate
TU Dublin Hygrothermal Risk Assessment Graduate
MEng Civil Engineering
MSc Sustainable Architecture
Regions or towns/cities to carry out AECB certification services
UK wide
Contact Email Address
konstantinos.megagiannis@qodaconsulting.com