Master the science. Become the expert every project needs.
The internationally recognised qualification that proves you can design buildings that perform. Taught on-demand by practising certifiers, from real projects, so you never look at a detail or a wall build-up the same way again.
The qualification itself, examined by the Passive House Institute and accredited by the RIAI. Recognised wherever Passivhaus is built.
Most people learn the rules. You'll learn the physics the rules come from.
Compliance follows a checklist. Performance comes from understanding why the checklist works, so you can judge a borderline detail, defend it in a design review, and design with certainty instead of hope. It is what gets you specified, and asked back.
Filmed on real building sites.
The detail graduates single out most is the on-site footage: Tomás walking a real window installation, a real airtightness layer, a real thermal bridge. You learn how the standard actually gets built, not only how it reads on a drawing, the one thing a slide deck can never teach.
It comes from over 30 years of designing and certifying Passivhaus buildings, from one-off homes to a 26-storey tower. Every lesson is grounded in a real, delivered project.
There are other Passivhaus courses. Here is why people choose this one.
- Taught by a trainer working from slides
- Generic diagrams and stock examples
- In-person blocks, with travel and time off site
- One-off houses, and not much else
- You meet the exam on your own
- Software access expires when the course ends
- A set of recordings, then goodbye
- The most affordable route to the full qualification
- 100% online and on-demand, no travel, sit it on your schedule
- Taught by practising PHI certifiers, on the projects they deliver
- Filmed on real, certified building sites
- Case studies across every building type, up to 26 storeys
- Mock papers, written feedback and a 98% pass rate
- PHPP licence kept permanently, yours to keep
- Monthly live Q&A with Tomás and a graduate community for life
98% of mosart students pass the PHI exam.
It comes from mock papers, written feedback and a dedicated tech-setup session before you sit. You reach the PHI exam ready, not anxious. And if you ever need it, you can re-sit.
Building science is a superpower.
Read any building like an open book
Look at a wall build-up and see immediately where it will fail, thermally, structurally, from moisture. No guesswork, no hoping for the best on site.
Become the go-to for performance
Colleagues start pulling you into design reviews. Clients ask for you by name. You are the person the team turns to when performance has to be right.
Apply it to any project, immediately
New-build apartments, deep retrofits, social housing, one-off homes. The physics is universal, and you start using it from day one.
Model real performance, not compliance
Run a full PHPP energy balance, test design options, and predict how a building will perform in use, rather than ticking a checklist and hoping.
Built for professionals who can't stop working to go back to studying.
Architects & building designers
Understand the physics behind every decision you make. Lead Passivhaus projects with confidence and win the work that increasingly specifies it.
Engineers & consultants
Cover the full envelope, MVHR, renewables and thermal bridging, and finish knowing how to model real performance to certification level.
Developers & project managers
You don't need to become a certifier. Knowing what certification demands means you brief teams better, catch problems earlier, and protect asset value.
They studied it. Then they built it.
Delivered a bio-based Passivhaus Plus home using EcoCocon wall panels for a young family in the UK.
"Mosart's real-world approach gave me the confidence to deliver our first Passivhaus project, a Passivhaus Plus home at that. The CPHD was essential to earning the client's trust and steering it to certification."
Delivered the Moville Passivhaus project, balancing architectural ambition with certification-level performance.
"The CPHD transformed my approach. I developed practical PHPP skills to test design options and predict energy performance, and the emphasis on early design input reshaped how our whole team collaborates."
13 modules. Built from real projects.
Every module is grounded in a real, delivered project, with quizzes and exam preparation throughout.
One fee. Everything included.
13 expert modules covering insulation, thermal bridging, airtightness, ventilation, windows, renewables, certification and economics.
32 hours of video, 45 hours of total study including quizzes and exam preparation.
PHPP software licence, included permanently. The tool certification is built on, yours to keep.
Full exam-prep course with mock papers and written feedback, so you sit the PHI exam ready.
Quarterly exam sittings with a dedicated tech-setup session beforehand.
Monthly live Q&A with Tomás and the team, all recorded. Bring your real project questions.
Lifetime access to the mosart graduate community for support long after the exam.
12 months of access. Study at your pace, around a full project load.
From enrolment to certification.
Enrol & start immediately
Instant access to every module. Work through them at your own pace, on your own schedule.
Learn with live Q&A
Monthly recorded sessions with Tomás. Bring your real project questions and get specific answers you can apply the next day.
Get certified by PHI
Sit the Passive House Institute exam with confidence and join the international register of Certified Passivhaus Designers.
The PHI exam is demanding. The preparation is built to match it.
The PHI exam is a real professional exam, and our 98% pass rate is not an accident. You get mock papers with written feedback, a revision focus and a tech-setup session before you sit. And if you ever need it, you can re-sit.
From your own home to a town at scale.
Tomás O'Leary
Tomás delivered the first certified Passive House in the English-speaking world and has spent over 30 years leading mosart at the cutting edge of sustainable design, consultancy and education. He has trained thousands of professionals worldwide and helped shape Passivhaus training standards.
"Tomás delivered it in a way that felt very interactive and engaging, even pre-recorded. It really helped me stay focused throughout." David Flynn, graduate
What our graduates say.
"Light-bulb moment. Wish I had done it 10 years ago. Well paced, easy to follow, a great balance of text, videos and diagrams to explain the concepts."
"The explanations are clear and thorough, and I could set the pace around my availability. I feel ready to complete a few mock exams and face the final with confidence."
"I'm a carpenter and small builder, not an architect, and I was apprehensive. The team gave me the confidence to take it on. The real-world case studies made it click."
One qualification. Career-long returns.
Certified Passivhaus Designer, on-demand
- All 13 modules, self-paced
- PHPP licence, kept permanently
- PHI exam registration & prep
- Mock papers & written feedback
- Monthly live Q&A with Tomás
- 45 CPD points
- Quarterly exam sittings
- Graduate community for life
The same qualification taught live: nine half-day webinar modules plus e-learning, the PHI exam and 45 RIAI CPD points.
Ask about live dates →Same course, same access, same everything, split across three payments. Pay in full and save €200.
Enrol three or more and we will invoice your practice directly, with PO support and per-delegate completion reports. Tailored in-house cohorts available.
Arrange team booking →Watch the first lessons free, no card needed. Decide once you have seen how it is taught.
Watch a free previewCommon questions.
I'm busy. How much time does this actually take?
How much does it cost?
Do I need an architecture or engineering degree?
Is it relevant in the UK?
Is this just for houses?
How hard is the exam, and what if I don't pass?
What happens after I'm certified?
I'm outside the UK and Ireland. Can I still enrol?
Become a Certified Passivhaus Designer.
Join hundreds of architects and engineers who have transformed their practice with the most rigorous building-science training available. On-demand from €1,795.
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