The new operation will be known as untypical and brings together Hopkins Homes and Tilia Homes with an initial target of delivering 2,000 houses a year.
Tilia Homes was formerly known as Kier Living before being rebranded by Terra Firma after its £110m acquisition in 2021.
East Anglia based Hopkins Homes was acquired by Terra Firma in 2022.
Both names will continue as the customer-facing brands enabling untypical to dual brand sites across the Midlands, the West, the East and East Anglia.
Guy Hands, owner of untypical and founder of Terra Firma, said: “As an investor in the UK housing market since 1996, it is clear the traditional industry model is unable to meet the wants and needs of the modern homebuyer.
“By building homes based on robust customer insight, we see an opportunity to do things better and bring about positive change.
“The launch of untypical is just the starting point on our journey, but we believe that it has the potential to be transformative – not just for our business but for the whole housebuilding industry.”
Chris Severson, Chairman of untypical, added: “By combining the strengths of the Hopkins Homes and Tilia Homes brands, we will design and build the homes that people really want and are also good for the planet.
“Untypical’s growth will be underpinned by deep technical expertise, a strong, supportive shareholder and driven by a team of industry leaders.
“With a focus on affordability, sustainable materials and long-term community building, our untypical approach will aim to not just meet expectations, but push boundaries and redefine industry standards.”