Communities Secretary Eric Pickles has given the green light on the redevelopment of the town hall in Trafford.
Shepherd Aligned and Manchester-based 5plus Architects gained planning permission from Trafford Council in March which was subject to approval from the Secretary of State.
Trafford Council said a legal agreement is now signed meaning work on the scheme can begin on schedule this summer.
Richard Squire, project director for Shepherd Aligned, said: "We are now planning to begin the redevelopment in August and look forward to Trafford having a much-improved facility that will benefit the whole community."
Paul Norbury, director of 5plus Architects, added: "This is great news for the whole team and we can continue with the detailed design of this exciting scheme."
The council said that without redeveloping it would have to spend at least £34m over a 25 year period to maintain all its administrative buildings.
Matt Colledge, leader of Trafford Council, said: "This decision means it is now 'all systems go' for the much needed refurbishment of the town hall. The project is going to save our taxpayers millions of pounds over the coming years and we have been working hard internally to ensure we can begin as soon as possible."
Colledge added that the council is reducing the number of administrative buildings from six down to one main building and will reduce the maintenance costs of the Town Hall, meaning the council will now be spending at least £5m less.
The project will be based around four distinct components:
- The refurbishment of the existing Grade 2-listed town hall, including an historic council chamber, and the creation of meeting, conference, training and dining facilities, including a restaurant and coffee-bar, for both employees, as well as the wider community
- 45,000 sq ft of new open-plan office space which is accommodated within three, two-storey wings
- A new public reception and conference facility which fronts Warwick Road
- A two-storey internal street which all three of the above components are hung
Landscaping and seating, across a sunken garden and three courtyards, will also aim to create an informal public realm environment, particularly over the summer months, enhancing the appearance and character of the location.
Building work is due to be completed in 2012.