Earthwise are energy consultants who specialise in low carbon buildings that are beautiful, comfortable and affordable.

What we do

Passivhaus Design

We offer a Passivhaus Design and consultancy service including feasibility studies for homes in the UK using the Passivhaus Planning Package (PHPP) to deliver high quality, high comfort, low energy houses.

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Energy Audit

For commercial property and public buildings to find cost savings through energy efficiency and renewable energy.  Our energy audit will identify payback, return on investment, tax incentives and grants to reduce capital costs.

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About us

Earthwise are Passivhaus Designers and Commercial Energy Assessors with specialist knowledge in green building design, energy efficiency and renewable energy technologies. 

We enjoy collaborating with clients, architects and engineers to develop low energy building designs for residential new build / retrofit of existing homes and commercial / industrial buildings.

We are based in Brighton & Hove in Sussex and have been working with low carbon buildings since 2003 all over the UK. 

We offer a range of services including Passivhaus Design & feasibility studies, energy audits and energy calculations and assessments for new build commercial buildings (BRUKL).

We are members of the AECB, Passivhaus Trust, International Passivhaus Association, The Green Register and Elmhurst Energy.

Our work

Resource for London

Blandford Ave Passivhaus

Lovers Walk

Wellington Lane

What people say about us

“This was one of the most useful CPD seminars we have had in the office in recent years, and we would definitely recommend it. Mischa Hewitt is an engaging presenter who introduces the ideas behind Passivhaus in a way that all our staff found accessible, whether or not they already knew much about the concept.”

Elizabeth Davis, Noma Architects, Manager

“If you are refurbishing a building and are thinking about energy then you need someone who can do the sums and come up with the best options to bring the building fabric up to a good standard.

Earthwise can not only do that but will also give you pragmatic suggestions as to what materials to use to suit your budget and circumstances. Essential service to make your building fit for the future.”


Howard Johns, Byelaw Cottages, Client

“I would like to thank you for your work on Field House, I have sung praises about your work to the others in the team here, and very much appreciated the care and time you took to explain concepts to the client.”


Samuel Whinnett, ASKEWCAVANNA Architects, Architect

“The Passivhaus seminar was excellent, informative and well presented. Those that attended the presentation appreciated it very much and is one to add to our ‘triple A list’ of seminars.”


Robert Gurney, tp bennett, Architect

“Earthwise provided on-going design advice and prepared PHPP calculations for a pair of new build Passivhaus in Oxford. I found Earthwise’s experience crucial at the design stage. As the design developed Earthwise identified potential problems with the design so refinements could be made before work started on site.

I would have no hesitation in recommending Earthwise to other designers and architects who require assistance with their low energy building projects.”


Guy Roberts, Blandford Avenue, Architect

Passivhaus Designer logo

AECB logo

International Passivhaus Association logo

The Green Register logo

Elmhurst Energy logo

Get in touch

If you would like to discuss your project with us then please fill out the form.

We aim to reply within 24 hours.

Or call us today and we can start a conversation.

01273 766631
Twitter: @mischah

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