Retrofit
Most buildings that will exist in 2050 are already built, yet many of these homes and workplaces are cold, inefficient and expensive to run, often reliant on fossil fuel heating and shaped by layouts that weren’t designed with energy performance in mind. Heritage constraints, complex geometries and outdated fabric add further layers to the challenge, making it hard to know where to start.
We help you plan and deliver retrofit that’s practical, respectful of context, genuinely improves comfort, adheres to regulations and improves energy performance.
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Unsure how to move away from gas or legacy heating systems? We develop tailored heat decarbonisation plans that consider your building’s constraints, available technologies and funding opportunities, helping you transition to low-carbon heating with confidence and compliance.
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If your building is cold, leaky or expensive to run, we design fabric-first retrofit strategies that target insulation, airtightness and reduction of thermal bridging. This reduces energy demand, improves comfort and sets a strong foundation for future decarbonisation.
We offer retrofit strategy advice and have in-house Passivhaus EnerPHit and AECB CarbonLite certifiers.
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Want to achieve deep retrofit with confidence and clarity? We guide you through the EnerPHit process from initial feasibility to certification, ensuring your building meets rigorous performance standards while respecting budget, heritage and buildability.
We have an experienced team of Passivhaus consultants, and Chris Swinburn is our Passivhaus / EnerPHit certifier.
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Worried about mould or long-term fabric damage?
We assess the potential for moisture accumulation within building elements helping prevent mould, material degradation and indoor air quality issues, which are critical for airtight and highly insulated buildings. We provide expert guidance on moisture and heat transfer through building envelopes using tools like WUFI and Glaser risk calculations. This supports safe, durable, and comfortable design, especially in retrofit scenarios.
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Facing performance gaps or technical uncertainty in your design? We apply our fundamental understanding of building physics to simulate heat, air and moisture behaviour, turning complex interactions into clear, buildable strategies that deliver real-world results.
See our Building Physics and Environmental Design page for more information on our services in this area.