The Guernsey Competition and Regulatory Authority has published the findings of its independent review into the island’s concrete and aggregates market.
The report concluded that while concrete prices are significantly higher than comparable UK benchmarks, there is no evidence of anti-competitive behaviour.
The study was launched following concerns raised by the Committee for Economic Development about rising construction costs and the impact this may be having on housing, investment and the delivery of essential infrastructure.
The review found that Ronez is currently the sole supplier of ready-mix concrete in Guernsey and that pricing reflects the structural realities and costs of operating in a small island market rather than anti-competitive conduct. It also found that Ronez’s profitability has been consistently strong in recent years, particularly in ready-mix concrete.
However, the Guernsey Competition and Regulatory Authority (GCRA) said the evidence does not support enforcement action under Guernsey competition law, noting that higher prices or profits alone do not mean competition rules have been broken and that there must be clear proof that pricing is unjustified.
While no legal breaches were identified, the review highlights wider challenges that limit competition and keep costs elevated across the construction supply chain. The Authority said the findings provide a strong evidence base to help policymakers and industry consider how outcomes could be improved over time.
The report also identifies several practical approaches that could help strengthen transparency, encourage greater choice and support a more resilient market. These include improving transparency around pricing and performance, exploring open-book approaches in public procurement, reducing barriers to alternative supply where possible, and supporting greater competition and workforce mobility within the sector.
The GCRA said it will continue to work with the States of Guernsey and industry stakeholders as these ideas are explored further.
Michael Byrne (pictured), Chief Executive of the GCRA, said: “This review confirms that concrete costs in Guernsey are shaped by structural challenges rather than unlawful behaviour. There is no single quick fix, but it highlights clear ways that the States can help improve how the market works, addressing long-standing barriers to supply, strengthening competition over time, and delivering better outcomes for consumers and taxpayers.”
