Parc Hadau in Pontardawe, South Wales, was the first built demonstration of the Sero Homes model — a scheme designed from the ground up to deliver genuinely zero-carbon homes that were also commercially viable, replicable, and underpinned by measured in-use performance rather than modelled predictions alone.
The project was co-founded and shaped from its earliest stages by Andy Sutton as a founding director of Sero — a company established specifically to prove that this kind of housing was achievable in the real world, at a price people could afford to rent, with the data to demonstrate it was working as designed.
What made it different
The Sero Homes model was built around three interconnected principles: a highly insulated, airtight fabric that minimised heat demand; integrated photovoltaic and battery storage systems sized to the home’s actual energy profile; and a digital monitoring and optimisation layer that tracked performance and adapted system behaviour in real time.
Crucially, Parc Hadau was built to rent — not to sell. This was deliberate. The build-to-rent model meant that Sero retained a long-term interest in performance: if the homes didn’t work as designed, Sero bore the consequence. It aligned the developer’s incentives with the residents’ experience in a way that speculative sale cannot.
What we did
- Co-founded Sero and shaped the overall design, energy systems and performance strategy for the Parc Hadau development,
- Developed the fabric specification and energy system sizing to deliver zero-carbon operation across varied household profiles,
- Designed the performance monitoring framework, establishing what needed to be measured, how, and why,
- Worked with the World Green Building Council and others to contextualise and communicate the project’s significance within the international zero-carbon housing landscape.
The homes that get built and then forgotten are the ones that fail. Parc Hadau was designed to be watched — because only what gets measured gets managed.
Recognition and legacy
The World Green Building Council recognised Parc Hadau as a world first in zero-carbon build-to-rent housing — a designation that reflected not just the technical achievement but the model behind it. Sero was subsequently certified as a B-Corporation, reflecting its commitment to delivering social and environmental value alongside financial performance.
The project demonstrated that zero-carbon housing was not a utopian aspiration but a deliverable product — one that worked in the real world, in a real Welsh town, for real people paying real rents. It remains a reference point for the UK housing sector’s ongoing journey toward net zero.