We believe

At Lava, we share a common sense of duty to leave the planet in better shape than we found it, and everything we do reflects this belief. Our work is focused on fighting climate change, improving local air quality, saving our clients’ money and increasing their comfort.

The Lava team

Toby Costin, Co-Founder and CEO

Toby is volunteer chair of CREW Energy, a SW London not-for-profit climate action group, where he brings seven years of experience in the renewable energy sector. Toby has delivered over 1 MWp of solar and introduced a number of new technologies to the community energy sector. Toby has been involved in commercial installation of Hydromx® since 2018.

Stephen Jones, Co-Founder and COO

Accountant and experienced COO who has spent the last eight years working with SMEs and start-ups. He has been concerned about Global Warming since he first learnt about it when writing a dictation as a Chemical Engineering undergraduate. He now wants to work to reduce the causes of Climate Change in the UK and as a result set up Lava with Toby.

Mark McGavin, Board advisor

One part engineer, one part geek, one part entrepreneur with the ability to read a balance sheet! Passionate about delivering real energy savings.

Mike Welsh, Board advisor

Mike has spent over 40 years in marketing and communications on both client and agency-side, including stints at Sealink, Omnicom, Publicis and Havas. His experience covers pretty much every marketing discipline and industry sector.

Our Values

Climate Change

Lava’s first product, Hydromx®, can cut carbon emissions by 30% in heating, cooling and heat recovery systems. That is close to one tonne of carbon per household in the UK. Lava is working closely with our suppliers to deliver our products to you with the lowest carbon impact possible. We are a net zero company and will offset any carbon we generate through local projects that will benefit residents in the areas where we work.

Air Quality

Lava’s focus on cutting heating demand will, in turn, reduce gas flue emissions (particulate matter, carbon monoxide and nitrous oxides) and so improve air quality. We are also focussed on our own actions and will look to bring our products to your homes and businesses in electric vehicles and on cargo bikes.


We work closely with community groups across London to deliver our service – offering them training and employment opportunities to make London a greener, cleaner and fairer place to live and work. We are committed to investing a minimum of 10% of profits into helping families struggling to heat their homes with free installation of our products. Working closely with community groups, we aim to help the 360,000 households in London that are in fuel poverty.


Lava will create sustainable green jobs across the capital, offering training and career development. Recruits will be trained to become plumbers and heating engineers, offering them transferable skills. We are committed to paying the London Living Wage.