"CTT has delivered a superb building... successfully incorporating leading edge sustainable architecture into a contemporary building"

Nick Lawrence, Project Manager
Bucks County Council

"The personal commitment of time and energy that CTT bring to this commission is fully appreciated"

Nigel Sands, Ashton Court Project Manager

"Carefully considered work with the very best regard to maintaining the historic character of the building"

Historic Buildings Officer, Drakes Almshouses, Amersham

"We are all delighted with the result. Many people who visit the extension comment on how well it fits in with the surroundings and on the beauty of the interior"

Chris Deal, St Paul's Church, Chipperfield

"Janet Cotterell was recommended to us as an Architect with design flair. She has produced a building for us which has been widely appreciated for its style"

John Phillips, Client Representative for Rayners Lane Baptist Church

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CTT - Award Winning Sustainable Architecture

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Low Energy Design

As architects one of our core responsibilities is getting the building fabric right for low energy performance - at CTT we take this as an essential starting point.

Recent Projects

From achieving the certified Passivhaus low energy standard, to an award winning community building in a highly sensitive historic setting - CTT bring performance and design together.

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Architects specialising in low energy design and Passivhaus

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thumbnail IMAGES
to see the full picture

Janet Cotterell is co-author of
The Passivhaus Handbook the first
comprehensive book on Passivhaus
Buy from Green Books direct and get
a better price than Amazon!

CTT Sustainable Architect is the new name of Cotterell Thomas & Thomas LLP.

CTT's approach to architecture is to bring together design flair with a sustainable, low energy focus. Low energy building solutions are sometimes accused of lacking uplifting design - we believe both can be successfully achieved, producing low energy buildings that respond appropriately to their context (both physical and historical) and contain light, calm and uplifting spaces.

CTT prefer the use of natural, healthy materials and by designing using Passivhaus low energy principles our buildings will also be comfortable, and healthy for their occupants, and inexpensive to heat.

CTT work in a collaborative style, it is your building and your investment after all. We adopt the same team approach with all those involved in the building process, and especially aim to work closely with the chosen contractor.

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What is Passivhaus?

Passivhaus is a building methodology that targets reducing the energy needed for heating by 90%, while maintaining a comfortable indoor temperature and ensuring healthy indoor air quality, all year round.

Our design service is combined with the latest PHPP energ modelling tool. PHPP is the only proven software that accurately predicts the energy savings that will be achieved by a building.
This early modelling optimises your build costs as well as ensuring we deliver lifetime savings on your energy bills.

By working as an integrated team (see our joint venture for housing at www.passivhaushomes.co.uk) we are best placed to deliver quality, low energy and comfortable buildings at economic costs.
Read more about the Passivhaus Design standard here.

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Featured Project: Totnes B&B in Devon

This 1970's retrofit (including a new build extension) is one of the first retrofits in the UK certified to the full Passivhaus standard. The project has been shortlisted for the UK Passivhaus Awards 2013 - click on the thumbnail IMAGES above to see the full photograph

Learn more about the transformation on Adam's popular "Passivhaus Refurb" blog here.
View more photos from the project here.
See an interview with our client on site, featured on BBC Spotlight, via YouTube.