Centre for Alternative Technology

Course Search



The Centre is in a unique position to offer courses. Our staff have many years of 'hands-on' experience, backed up by academic expertise in their subjects. Our renewable energy hardware, organic gardens, ecological buildings and sewage systems are ideal for practical sessions, and the holistic approach of the Centre enables topics to be examined in a broad, sustainable environmental context.

Carwyn Lloyd Jones

Carwyn Lloyd Jones has over 20 years experience in the construction industry and is an expert in timber framing.


Carwyn is our main tutor on our  Build a Tiny House course as featured in The Guardian. Carwyn has written and is tutor on our new course for 2019 Build a Natural House. He also is the tutor on Advanced Timber Frame Joints and DIY Furniture. Carwyn is also the designer / builder of the Dragons eye as featured on Epic Retreats.


He has built some of the buildings around the CAT site including a new Insulation display on our visitor circuit and building an extension to house our new biomass boiler.


He has constructed two wooden buildings at Grand Designs live. The first was a Compost toilet in 2012. Grand Designs were so impressed they invited him back in 2013 where he built a replica of Kevin McCloud's shed. 


Dieter Brandstätter

 Dieter Brandstätter

Rob Goodsell


Rob Goodsell has been working for CAT for eleven years.


Rob is our main tutor on our Sustainable Woodland Management course, amongst others.


His love of and connection to nature in part comes from living in Canada’s wilds as a child.


Rob has been teaching for seventeen years both in classrooms and the outdoors.  He is currently working four woodlands of differing natures but to sustainable management principles focusing on the relationship between conservation, resilience, human interaction and economic realities.

Read more...

Pat Borer


 Pat Borer

Pat Borer is an architect with over 35 years experience in designing and constructing 'green' buildings.


Pat is our main tutor on our Timber Frame Self Build course.


He has been closely involved with the Centre for Alternative Technology in the design and development of ultra-low energy buildings, passive and active solar heating systems, photovoltaic roofs, benign building materials and technologies, co-operative ways of building and healthy internal environments.


Read more...

Geoff Stow

 Geoff Stow is a tutor on our Timber Frame Self Build and Self-Build Project Management courses.


Geoff’s background is in community development and built his own home on a Self Build Scheme in London and went on to site manage other self build schemes in London and Brighton.


He was worked development worker for the Walter Segal Self Build Trust, and was a committee member of The Association for Environment Conscious Building (AECB).

Read more...

Dr Ruth Stevenson




Ruth is a senior tutor on our Tools to imagine a sustainable future course.


Ruth specialises in the institutional, social, planning and environmental aspects of sustainability. She spent her early career as a consultant environmental planner, primarily in the renewable energy industry, acting as a Director for the leading, worker owned renewable energy company, Dulas Ltd.


Whilst representing the wind energy industry on the planning policy panel for the Welsh Government, she was inspired to initiate her PhD research on the policy making process and its effects on the delivery of ‘sustainable development’. Since then, Ruth’s research has focussed on new governance models required for energy, environmental and social resilience.

Read more...

Bee Rowan

Bee Rowan is our tutor on our Building with Strawbales course, Clay Plastering and Lime Rendering courses.


Bee Rowan has become a name synonymous with straw bale building here in the UK and throughout many parts of Europe. After discovering the manifold benefits & joys of straw bale building for the first time in 1994, Bee has subsequently dedicated her life to the promotion of this wonderful material for sustainable and affordable construction.

Read more...

Finn Finlay

Finn is a tutor on our HETAS courses.


Coming from the frozen island of Fyn in Denmark, Finn is dedicated to the basics of being warm, dry, and light as a recipe for loving your home and living well.

From his heating hub ‘Dyfi Fire’ in Machynlleth, Finn has been installing all manner of sustainable heating systems for fifteen years and has much to share on efficient, cleanburning  and cost effective ways to design your home and heating systems.

Tom Dixon

Tom Dixon was co-founder of V3 in 2006. Tom has a background in physics and is V3's most rounded engineer.

He has taught on nearly 50 wind turbine courses and overseen over 30 installations. 

Tom is the tutor on our Build a small wind turbine course. 

Bo Tang

Bo Tang studied architecture at the Bartlett School of Architecture (UCL), University of East London and London Metropolitan University, where she graduated with distinction in 2008.


Bo is a tutor on A Way of building course here at CAT.


Since 2006, Bo has been involved in the research field of the Architecture of Rapid Change and Scarce Resources (ARCSR), coordinating and managing live projects with students in informal settlements in India, in collaboration with local NGOs, and funded by the Water Trust. These include a sanitation upgrading project in Agra, cooperative resettlement housing and infrastructure in Delhi, and quarry classrooms in Navi Mumbai.

Read more...

Paul Allen

Paul Allen is our main tutor for our Zero carbon Britain courses at CAT.


Holding an Honours degree in Electronic and Electrical Engineering, Paul joined CAT in 1988.


 He assisted in the development and production of a wide range of renewable energy systems and helped develop CAT’s spin-off engineering company, Dulas Ltd.


He is currently CAT External Relations Officer and ZCB Project Co-ordinator.


Read more...

Frances Hill



Frances Hill is a Senior Lecturer on the MSc SA, and Subject Leader on MSc SEPDM.


With a background in physics, and a PhD in Environmental Engineering, Frances lectures on heat transfers in buildings, and on renewable energy provision. She also teaches study skills including in data analysis.

Read more...

Nick Parsons

Nick Parsons, has worked for over 25 years in energy-efficient and sustainable building and renewable energy.


Nick is the lead tutor on our Eco-Refurbishment course here at the CAT.


For 10 years from 2000 - 2010 he ran a community-sector project in Sheffield promoting and demonstrating all aspects of sustainable building, based in an eco-refurbished terraced house, before going freelance in December 2010.



Read more...

Alex Sparrow

Alex Sparrow works for one of only a handful of companies working with hempcrete in the UK and the only one to work with self-builders.

He is the tutor on our Hempcrete - Retrofitting for self-builders course.

He works on the strategic development of the company but still regularly take the opportunity to get his hands dirty on the building sites.

He is also a freelance writer on natural building.

Julia Walling



Julia Walling is the creator of Woods for Wellbeing, a social enterprise that connects people with woods.


Julia is a tutor on our  Social Forestry course.


She designs and runs a wide variety of social forestry projects for partners such as AONBs, Butterfly Conservation and the Forestry Commission.


She has been a teacher, counsellor and meditation tutor for over 25 years and is involved in curriculum and course design for social forestry.

As lead tutor, she delivers the Social Forestry OCN training course for The Small Woods Association

Maurice Mitchell


Maurice MitchellMaurice Mitchell AA Dipl. RIBA Professor Architecture of Rapid Change and Scarce Resources (ARCSR) London Metropolitan University.


Maurice is the main tutor on our A Way of Building course here at CAT.


Maurice Mitchell teaches, researches and directs live projects in the Faculty of Architecture and Spatial Design (FASD) at London Metropolitan University where he runs a Diploma Studio. He has also taught at the Architectural Association, Oxford Brookes University and the Development Planning Unit, University College London.



Read more...

Angie Polkey

Angie moved to Wales in 1997 to practise and teach permaculture design and nature conservation. Her qualifications include a PhD in Ecology and an Advanced Certificate of Education.


Angie is a tutor on our Permaculture courses.


She has worked for various NGOs, including a Wildlife Trust, RSPB, Learning through Landscapes and, for almost 15 years, Denmark Farm Conservation Centre near Lampeter, where she was the Project Coordinator.

Read more...

Neil Hopkins

Neil Hopkins of Forge Ways is the tutor for the Spoon Carving course here at the Centre for Alternative Technology.


Neil moved to the Dyfi Valley in 2007 to work as a Renewable Engineering Project Manager and to live a more sustainable way of life on a smallholding, nestled in the foothills of the Cambrian Mountains.  


He has a passion for traditional skills and low impact ways of living, combined with a wealth of experience instructing in the outdoors.  Neil has diverse qualifications and experience of arboriculture, green wood working and bushcraft.

Read more...

Tim Coleridge


Tim Coleridge


Tim is an Architect and Programme Leader of the Msc:SABE ( Sustainability and Adaptation in the Built Environment ) by attendance and distance learning, and a BREEAM Offices Assessor.  


Prior to joining CAT, Tim spent eight years in practice at Hopkins Architects in London where he led design teams working on projects ranging widely in programme and scale. Each of these projects tackled head-on in different, but equally ambitious ways, the real world challenges of sustainable and low energy design.


Read more...