Learn from real world examples how to reduce risk, achieve airtightness and deliver a successful retrofit project on site.

Gain the knowledge needed to deliver successful EnerPHit and other deep fabric retrofits on-site, exploring complexities and challenges encountered through real-world examples.
Learn how work effectively as a team to reduce risks and avoid costly unintended consequences.
Designed and taught by experienced trainers with hands-on retrofit expertise on multiple project types.
SPACES AVAILABLE
Retrofit Delivery - June 2026
1st Jun 2026 - 11th Jun 2026
View Schedule
FROM £320 ex. VAT
Online
This course prepares you to have confidence in the retrofit design, solve on-site problems and deliver high-quality results.
Using case studies that mirror real-world scenarios, problem-solving exercises, and expert guidance, you will deepen your understanding of the key elements of delivering deep fabric retrofits, including moisture management, airtightness and more, while tackling the unique challenges of retrofit projects.
Discover how to manage retrofit risks and costs, reduce unintended consequences and deliver quality retrofit using tried and tested techniques and applicable to EnerPHit, AECB Carbonlite, PAS2035/20 and other standards and guidance.
This course consists of four live, interactive online sessions led by trainers experienced in retrofit projects of all scales:
Session 1: Introduction to retrofit, whole building approaches, and introduction to moisture in buildings.
Session 2: Exploration of moisture risk, insulation, and problem areas in retrofits.
Session 3: Thermal bridging, airtightness and wind tightness, building services in retrofit.
Session 4: Building services continued, case study tutorial and retrofit in reality - explore what happens in real situations and the practical challenges when a project gets to site.
This course is ideal for a range of roles:
Retrofit Coordinators and Assessors: develop practical understanding to support your existing knowledge.
Designers & Consultants: Gain insights into assessing buildability, supporting contractors effectively, and understanding the practical implications of your designs.
Contractors & Installers: learn how to reduce risk, achieve airtightness and manage for high-quality outcomes.
Clients: learn how to approach projects to manage cost, reduce risk and ensure quality is delivered.
Self-builders: understand what's needed to manage your project successfully and avoid unintended consequences.
| Duration | 4 × 3-hour sessions |
| Delivery Format | Blended — live online teaching + self-study |
| Price (Member) | £270 ex. VAT. Payment plans available, contact the team for details. |
| Price (Standard) | £320 ex. VAT. Payment plans available, contact the team for details. |
| Next Start Dates | Regular dates throughout the year |
| Location | Online |
| Certification & Credits | 16 PHI Credit Points & CPD Certificate worth 14 Hours |
| Access & Materials | PDF notes, case study exercises and appendix with supporting resources. |
| Funding Options | Head to our funding page for information on all current grants and funding: https://coaction.org.uk/funding. Payment plans also available, contact the team for details. |
| Accessibility | Reasonable adjustments and additional learning support on request |
We believe better buildings start with better skills — that’s why every Coaction course is grounded in real project experience and focused on practical, actionable learning that builds confidence and competence. Watch our overview video to learn more: Coaction Training Overview
Coaction exists to upskill the built environment — not for profit, but for impact. As a Community Interest Company, every penny goes back into improving training, supporting the workforce and accelerating the transition to low-energy, future-proof buildings.
Why choose Coaction?
Future-focused skills: Every course is shaped by live project experience, aligned with industry best practice and continually updated, giving you the confidence to deliver high-performance buildings now and as standards evolve.
With real project examples, industry best practice and our extensive experience of ground breaking projects, our training builds on tried and tested and quality-assured whole building approaches such as Passivhaus so that you can have confidence to deliver high performance buildings now and as standards evolve.
Progression pathways for every role: From foundation courses to advanced specialist training, we offer clear routes for students, professionals, educators and full delivery teams. Support is ongoing after training, through our alumni community, online resources and industry partnerships.
Fully supported learning experience: You’ll receive the materials and guidance you need to apply your learning, from manuals and sample packs to exam preparation (where relevant), PHI credit points and long-term access to high-quality resources. We'll work with you and your team as needed to make sure you get the right learning in place.
Trusted expertise & recognised training: Delivered by leading UK building-performance specialists, Coaction training has a strong reputation for quality technical content. Our courses are accredited by the Passive House Institute and Passivhaus Trust.
| Course Name | Dates | Location | Action |
|---|---|---|---|
Retrofit Delivery - June 2026 1st Jun 2026 - 11th Jun 2026 View Schedule | 1st Jun 2026 - 11th Jun 2026 View Schedule | Online | Book Now |
Retrofit Delivery - SEPT/OCT 2026 (Mondays) 28th Sep 2026 - 19th Oct 2026 View Schedule | 28th Sep 2026 - 19th Oct 2026 View Schedule | Online | Book Now |
Retrofit Delivery - NOV 2026 4th Nov 2026 - 13th Nov 2026 View Schedule | 4th Nov 2026 - 13th Nov 2026 View Schedule | Online | Book Now |
Retrofit Delivery - NOV/DEC 2026 24th Nov 2026 - 15th Dec 2026 View Schedule | 24th Nov 2026 - 15th Dec 2026 View Schedule | Online | Book Now |
This course will change your approach to retrofit forever. Continue your learning with the courses below:
Coaction courses ( PHI renewal points)
Passivhaus Practical (6 PHI) | Certified Passivhaus Designer | THERM (16 PHI)
Passivhaus Trust and member approved courses
Certified Training | On Demand | Partner/Member Events
Conferences / Communities / Events
Passivhaus Trust | iPHA | AECB
Publicise your projects and knowledge via the Passivhaus Trust, post on LinkedIn via your personal or work profiles and tag us.
Keep in touch - we are here to support you.
Our sessions are recorded but we don't share recordings as standard practice - in our experience, the best outcomes happen when you attend all live sessions. However, if you are unable to make a session due to exceptional circumstances please contact the Operations Team to request a recording link.
There are no strict prerequisites but we recommend you have some existing knowledge of fabric first principles to get the most out of this training.
See our Terms & Conditions here.
Yes,we offer a 10% discount on groups of 3 or more booked on the same course, applied automatically at check out.
Where possible we will offer an alternative study plan to suit your availability, please get in touch to discuss this further.