He takes over the role from Inland founder Stephen Wicks who retired at the end of September.
Going forward, O’Sullivan will lead the ongoing strategic review of Inland Homes which will be unveiled before April 2023.
He said: “I am pleased to be joining Inland Homes as its new CEO at such a strategically important time.
“I am looking forward to working with the Inland Homes team to return the business to sustainable profitable growth and to optimising the significant future opportunities available to us.”
O’Sullivan, aged 54, brings a strong track record in construction and property development. He was formerly CEO of the privately owned, Galliard Homes from July 2017 until March 2022, having joined the company in 2001 originally as a contract manager.
He started out as a graduate for Balfour Beatty in London. The early part of his career was spent working on major contracting projects, before being headhunted to join Galliard Homes in 2001.
At the time, its construction division was in its infancy and he was employed to grow and expand this in-house capability within the property development business.
During his tenure as CEO, Galliard completed over 5,000 homes and made aggregate profits of over £250m.