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The Nelson’s Project

Sustainable New Build Houses

We specialize in constructing sustainable new build houses in and around Hertfordshire that are energy-efficient and eco-friendly. Our team of experts will work with you to design and build your dream home that is both beautiful and sustainable, whilst still meeting the latest standards for new build homes.


Passive Houses

Passive houses are designed to be highly energy-efficient and require very little energy for heating and cooling. Mar Building Group Ltd are the leading 'Passivhaus' builder in Hertfordshire and have extensive experience in traditional brick/block, timber frame and retrofit Passive House construction. We can help you create a beautiful, comfortable and sustainable home that is cost-effective and environmentally friendly. 

The Jefferson’s Lake House

Refurbishments, Extensions and Lofts

Whether you're looking to update your existing home or add more space, we can help turn your vision into reality. Whether you use our network of architects or you have your own, our team of professionals will work with you to create a customized plan that meets your needs and budget, ensuring a beautiful and functional result.

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