OneDome has bought Trussle, which trades as Better.co.uk, from Better Home and Finance Holding Company.
The deal is subject to final sign off by the Financial Conduct Authority (FCA).
Babek Ismayil (pictured), founder and CEO of OneDome, said: “Trussle has built an excellent team and a reputation for innovation and customer focus.
“We share a clear vision: that buying a home should be simpler, faster, and less stressful.
“Trussle’s Smartbuyer proposition closely mirrors our own award-winning HomeBuyer Service, and combining our strengths is a natural next step to transforming this historically outdated sector.”
The deal will strengthen OneDome’s position in the digital homebuying market in the UK.
The combined group is set to handle over £3.5bn in annual mortgage lending and process about 1,100 property transactions every month.
The group will have 105 mortgage, protection and financial advisers and employ more than 230 people.
Ismayil added: “This deal gives us greater firepower to serve homebuyers and deliver a best-in-class digital journey.
“We’re thrilled to welcome the Trussle team into the OneDome Group and look forward to building something even more impactful together.”
Kevin Ryan, president and chief financial officer of Better, said: “We’ve thoroughly enjoyed working with OneDome throughout this process and are excited about their vision for the future.
“We wish the Trussle team every success as they enter this new chapter under OneDome’s leadership.”