At Marrons, our Architects provide integrated planning, architectural design and technical consultancy across a wide range of project types and scales, working from multiple locations across England. We take a collaborative approach to complex sites with multiple constraints, supported by an in-house planning and heritage team with extensive experience in listed buildings, conservation areas and sensitive historic contexts.

A significant focus of our work is the retrofit and improvement of existing buildings, with particular expertise in fabric-first design and low-energy refurbishment. Our approach is strongly informed by Passivhaus and EnerPHit principles, and supported by PHPP modelling, enabling us to develop robust, performance-led strategies tailored to the building, budget and project ambitions, including projects targeting full certification where appropriate.

We support clients from early feasibility and planning strategy through to detailed design and delivery, embedding energy performance, thermal comfort, indoor air quality, moisture safety and buildability from the outset. Our portfolio includes bespoke homes, high-quality residential developments, retrofit and adaptive reuse of existing buildings and brownfield sites, as well as work to listed buildings and heritage assets, where Passivhaus-informed upgrades must be carefully balanced with historic significance.

We place strong emphasis on measured and evidence-based performance, integrating energy modelling (PHPP), airtightness strategies, thermal bridge control, ventilation design and low-carbon technologies as part of a coordinated architectural process. We are also experienced in planning and heritage negotiation, working constructively with local authorities and stakeholders to unlock the full potential of sites and buildings while respecting their cultural, architectural and environmental value.

Our approach is collaborative, technically rigorous and design-led, delivering buildings that are comfortable, durable, low-energy and future-ready.