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SigmaRoc and Duo Group forge strategic alliance

L-R: Martin McWilliams, Duo Group managing director, and Michael Roddy, SigmaRoc regional managing director North West, at Hillhead 2024 L-R: Martin McWilliams, Duo Group managing director, and Michael Roddy, SigmaRoc regional managing director North West, at Hillhead 2024

Companies aim to revolutionize sustainable limestone aggregates supply in the UK market

NORTHERN European-quoted lime and limestone group SigmaRoc have entered into a 10-year, ground-breaking strategic alliance with Duo Group to produce and sell sustainable limestone aggregates in the UK market. The 10-year agreement has the potential to generate incremental revenue of more than £150 million over the course of the alliance, whilst significantly reducing SigmaRoc’s environmental impact through the repurposing of limestone quarry waste.

Under the terms of the agreement, Duo Group have agreed to establish state-of-the-art processing plants at up to seven SigmaRoc limestone quarries to reprocess historically uneconomical quarry tip waste into a premium construction material. The process therefore advances SigmaRoc’s ambition of utilizing 100% of the resource they quarry.


By repurposing this previously overlooked resource, the strategic alliance aims to extend the operational life of quarries, conserve natural resources, and align with sustainable development goals, ensuring a more sustainable future for the construction and infrastructure sectors.

Under the agreement, Duo Group will establish large scale state-of-the-art reprocessing plants to cover material preparation and processing, load and haul, plant operation, and material dispatch. SigmaRoc will put at the disposal of the strategic alliance all unprocessed ‘tipped’ materials which previously held no commercial value.

Martin McWilliams, group managing director of Duo Group, commented: ‘We are delighted to enter into this agreement. SigmaRoc have become a major player in recent years in the UK and Northern Europe. They have a clear roadmap on their growth journey and their ambition to reach 100% utilization of all production materials.

‘We are excited to be part of this journey. We share equal values in sustainability and innovation, and together we can achieve significant milestones by reducing the environmental footprint of the aggregates industry and helping to meet the sector’s ESG targets.’

Michael Roddy, group managing director of the North West Region at SigmaRoc, said: ‘We are delighted to partner with Duo Group on this project. This partnership marks another significant step forward in our commitment to sustainability.’

Charles Trigg, chief technical officer at SigmaRoc, added: ‘This is exciting news for the Group, proving both our ability to drive increased value as well as bringing us closer to achieving our goal of 100% utilization of all production materials.’


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