PJ Livesey Group has been granted planning permission to convert the former Mostyn House School in Parkgate, Wirral into housing.
Livesey will create 87 homes following a unanimous vote from planning members at Cheshire West & Chester Council. The grade 2-listed buildings will be restored to provide six houses and 38 apartments, a listed cottage will be renovated and 42 new properties will be built to the rear of the site, designed by Calder Peel.
James Woodmansee, development director of PJ Livesey, said: "Although this was a complex application we believe the committee members recognised the hard work and extensive consultation put in over the last two years to bring the project to this stage.
"It is rare to achieve a unanimous vote and really is a credit to all those involved and a testament to the dedication and skills within the company.
"The development will be a jewel in the PJ Livesey portfolio and saves not only the fine school building but also secures the future of the original chapel."
The PJ Livesey Group has made available a six figure dowry towards the future maintenance of the grade 2*-listed chapel which sits at the centre of the site.
The company has also made a significant contribution to Sport England to provide new sports facilities in the immediate area.
Georgina Livesey, director, said: "We worked closely with English Heritage and the local community on how best to save Mostyn House and develop the site and took on board what they said. The council appreciated the balanced approach needed and we are keen to get onto the next stage and start work to preserve this lovely landmark."
The PJ Livesey Group was advised by Manchester law firm Cottrills.