Consumer Mark McLaren is launching the claim with representation by competition law firms Hausfield and Geradin Partner on behalf of over 700,000 homeowners.

These are people who bought new-build homes between October 2015 and 24th June 2026.

Compensation of £2.2bn to £4.5bn is being sought, equivalent to £3,100 to £6,200 for each affected homeowner.

This follows an earlier Competition and Markets Authority (CMA) investigation that looked at the conduct of housebuilders between January 2022 and February 2024, which resulted in the companies accepting binding commitments in October 2025 to address the CMA’s concerns.

The commitments included agreements by the housebuilders not to share certain types of sensitive commercial information in future, alongside enhanced compliance measures and a £100m contribution towards affordable housing initiatives.

At the time several housebuilders issued statements following the agreement being reached, highlighting the voluntary nature of the £100m payment and that this was not an admission of wrongdoing.

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Now, according to Hausfield, court documents allege that the housebuilders exchanged competitively sensitive information with one another, including information relating to prices, buyer incentives and sales activity.

This claim alleges that these information exchanges reduced competition between the housebuilders and resulted in homeowners paying more for new-build homes than they should have.

If established, Hausfield has claimed this type of conduct would amount to a breach of UK competition law and could result in the housebuilders being liable for substantial damages. This claim seeks to go beyond the CMA investigation, alleging that the impact of information sharing may have extended well before 2022.

"If, as seems to be the case, housebuilders shared sensitive pricing and sales information with one another instead of competing properly, homeowners across Great Britain may well have been left out of pocket as a result,” said Mark.

“This claim is about standing up for those buyers and ensuring that compensation is delivered to those who deserve it.”

Development Finance Today has contacted all the housebuilders named in the legal claim for comment.

A statement from Berkeley Group read: “Berkeley is aware of the claim being pursued by Geradin Partners and Hausfeld.

“Given the nature of the proceedings, it would be inappropriate for us to comment further at this stage.”

Bellway, Taylor Wimpey and Vistry have all declined to comment. At the time of writing, no other housebuilders had responded.