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Mars Building Group Ltd

Building Sustainable and Lasting, Dream Homes


Our Services

As a building contractor, we offer a wide range of services to meet the needs of our clients. From building new homes and passive houses to creating beautiful extensions and refurbishments, we are passionate about delivering high-quality workmanship that exceeds our clients' expectations. At Mars Building Ltd, we take pride in our commitment to sustainable practices and use only the highest-quality materials to ensure a beautiful and long-lasting finished product. Contact us today to learn more about our services and how we can help you create your dream home.

Expertise in Sustainable Construction

Professional and Experienced Team

Quality and Attention to Detail

Accountability and Transparency


About Us

Mars Building Ltd

Mars Building Ltd is Hertfordshires leading building contractor specialising in sustainable and energy-efficient homes, Passive House construction, refurbishments and extensions.  With over 40 years of experience in the industry, we are confident in our ability to deliver top-quality results on every project we take on. We pride ourselves on our ability to work closely with our clients to bring their vision to life and create the home of their dreams. Whether you already have an architect in place or you would like our help with architectural, structural or sustainable/passive house design then contact us today and let us help you get started on your next project.


Recent Projects

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We chose Mars Building Ltd given their track record in building at the challenging low energy standard called Passive House. We knew finding builders who could build at that quality level and air tightness with brick and block would be a challenge. We were delighted in the experience and at the demonstrated level of pride in their work. We also had a good working relationship with the team. We are very happy with the outcome.

Jonathan- StAlbans Passivhaus

"We hired Mars Building to deliver our new build (masonry cavity wall) Passivhaus and were thoroughly impressed with the service throughout. Most important to me was their attitude and we got ‘buy in’ from day one. Key qualities included great communication, attention to detail and a solution mindset as challenges arose. They delivered on our architects plans, on schedule and within budget, and the team was a pleasure to work with. After a few years in our home we still absolutely love it. Thanks guys!”

Ben Adam-Smith, Tewin Passivhaus

"We engaged Mars Buiilding and his team to build our new house in 2015.

This was the best decision we made in the entire project and they have completely restored our faith in builders.

EVERYTHING went to plan. From beginning to end the build took less than seven months, and was completed on budget. The only increases were where we increased the agreed scope of work.

Mark and his team were a pleasure to deal with: polite, efficient, responsive  and were full of helpful (but never pushy) ideas and suggestions.

They never 'knocked off' early on a Friday, and worked virtually every Saturday and Bank Holiday.

Before being appointed they were open about the fact that they work on a small number of other projects at the same time, but the reality was that in seven months there were only about two working days when no one was on site.

The quality of building work, finishing (both internal and external), attention to detail, site security and general tidiness were superb. Fifteen months after moving in we still have a 'show home' and we would be happy to show it to anyone thinking about engaging Mars for similar building work"

Benjam & Anna- Newbuild Codicote

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