Bretton Investment Partnership Ltd is working to turn the mansion house into a hotel with bar, restaurant, gym, spa and conference and wedding facilities.
And this week, the company, owned by Rushbond, was granted a premises licence by Wakefield Council meaning the development can sell alcohol and provide late night refreshments.
The licence also means that entertainment can take place in the hotel and its surrounding grounds.
But the council’s Licensing Authority said outdoor music events must end at 11pm if more than 500 people attend, or 2am otherwise, to prevent nuisance noise.
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Rushbond’s real estate director Mark Finch said: “In terms of the operation of the hotel, it is an essential requirement to have these licences in place.
“Being granted the licences is another tick in the box to move forward with the development, alongside the construction work.”
Work to repair the mansion house in preparation for the revamp began in March.
And guests could be staying in at the multi-million pound development in the grounds of the Yorkshire Sculpture Park as early as Easter 2018.
Bretton Hall and the old library buildings will be turned into the hotel, with up to 120 bedrooms.
The current stable block will become offices as well as 13 lodges for guests wanting to stay at the complex for longer.
Other aspects of the development include exhibition space, a theatre complex, and a new link road for access.
Developers said around 100 new jobs will be created when the project is complete, as well as construction roles.