The UK's seven largest housebuilders are currently embroiled in a significant collective legal action, brought on behalf of an estimated 700,000 individuals who purchased new-build homes between October 2015 and June 2024. The lawsuit, seeking compensation of between £3,100 and £6,200 per claimant, could result in a total payout ranging from £2.2 billion to £4.5 billion for the industry. This legal challenge underscores persistent concerns about the market power of major developers and the structural issues within the UK's housing sector.
The roots of this legal action can be traced back to a market study initiated by the Competition and Markets Authority (CMA) in 2022, under the then Secretary of State for Levelling Up, Housing and Communities, Michael Gove. The CMA's findings, published in early 2024, highlighted that the UK's insufficient housing supply is largely a consequence of the speculative development model employed by large builders, combined with an unpredictable planning system. Crucially, the study also uncovered 'evidence from housebuilders’ internal documents' suggesting the 'sharing of commercially sensitive information' that could have influenced pricing, leading to a more focused investigation by the CMA in February 2024.
However, the CMA's investigation concluded in October 2025 without a definitive finding of competition law breaches. Instead, the implicated builders agreed to contribute £100 million to government affordable housing schemes, commit to ceasing the sharing of sensitive information, and publish new industry guidance. While the CMA did not reach a formal conclusion on legal breaches, the closure of the investigation opened the door for private litigation. Legal firms specialising in class actions identified this as an opportunity, leading to the current case now being heard by the Competition Appeal Tribunal.
Critics argue that the UK's housing market is unusually dominated by a few large developers, a situation that has evolved over decades following the decline of public housebuilding from the 1980s and a significant reduction in the number of smaller builders. This concentration of power allows major housebuilders to control the release of new homes, prioritising profit maximisation over increasing supply. For instance, between 2012 and 2015, the largest builders saw their pre-tax profits surge by nearly 200%, while their housing output increased by only 33%. This speculative model is often contrasted with practices in countries like Germany, Belgium, and Austria, where individual households commissioning local builders account for over 50% of new homes, compared to just 7% in the UK.
This lawsuit comes at a time when successive governments have pledged to increase housing supply, yet often find themselves reliant on the very large developers whose practices are now under scrutiny. The outcome of this case could not only provide substantial compensation to affected homeowners but also act as a significant catalyst for broader reform within the UK's housebuilding industry, potentially altering the balance of power and fostering greater competition and transparency.