Retrofit Architecture
Retrofitting is about upgrading existing buildings to meet today’s standards - improving energy efficiency and environmental performance without the need for new construction. It’s a smarter, more sustainable way to modernise your home.
At marsh:grochowski, we provide specialist retrofit design services across a wide range of projects — from social and private housing to apartment blocks and both traditional and non-traditional construction. Our expertise also extends to conservation and heritage properties, where sensitivity to historic fabric and context is essential.
Our team includes PAS 2035-certified Retrofit Designers, Certified Passivhaus Designer, and a Conservation Architect, ensuring every project is delivered to the highest industry standards.
PAS2035 Certified
PAS2035 is the UK’s gold standard for domestic retrofit. Introduced in 2019 and updated in 2025, it sets out a robust framework of qualifications, processes and performance expectations that must be met to ensure safe, high-quality retrofit work.
Working in full alignment with the PAS 2035 framework, we combine advanced knowledge of building physics, energy performance, and moisture management to produce robust, future-proof designs.
Our Expertise
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Large-scale retrofit programmes
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Archetyping and contextual design for varied construction types
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Energy balance, moisture risk, and thermal-bridging management
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Ventilation strategies and indoor air-quality optimisation
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Overheating analysis and mitigation
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Conservation Architecture
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Passivhaus Design
We utilise cutting-edge digital tools - including digital twins, 3D LiDAR scanning, and modelling software such as Cyclone, ReCap, and Revit — to generate accurate retrofit details and designs that improve an existing dwelling's building performance.
With more than 35 retrofit projects delivered in the last three years, we collaborate with local authorities, housing associations, and national construction partners. Our retrofit design services support decarbonisation, improve energy efficiency, and promote long-term sustainability in the built environment. As part of the UK’s journey to net zero, we deliver solutions that reduce carbon emissions, lower energy demand, and create healthier, more resilient homes for the future.
Get in touch with our retrofit architects
Looking to reduce your property’s carbon footprint and align with net zero goals? Our team is here to help. From your first consultation to final installation, our retrofit architects will guide you through a tailored retrofit strategy that works for your property.
Get in touch today.
Get in Touch
If you would like to know more about our services or projects, please get in touch. Let us know how we can help.
marsh:grochowski architects
37a Sneinton Hermitage, Nottingham, NG2 4BT
email: simon.smith@arcontext.com
phone: 0115 941 1761