Developer St. Modwen, in partnership with the Homes & Communities Agency (HCA), have lodged an outline planning application to North Somerset Council for further development of the 200 acre former RAF Locking site.
The first phase saw 100 homes built and a 6,000 sq ft office building. Construction is already underway on 150 homes in the second phase of housing.
For the third phase, St Modwen wants to develop a further 1,200 homes and 650,000 sq ft of commercial space.
The plans also include proposals for a secondary and a primary school, with 80 acres of landscaped open space and a new district centre which will include a retail high street and additional leisure and community facilities.
St Modwen regional director Rupert Joseland said: "The latest proposals for Locking Parklands will enable us to deliver a truly mixed use new community for Weston. The site was recently voted as one of the top three housing schemes in the UK and the next phase will build on that success to create employment space, jobs and affordable housing for the people of Weston."
HCA area manager Jay Lambe added: "Locking Parklands has been a resounding success, with stunning new homes and business space already created and proving popular. This is an exciting time for Locking Parklands, with people starting to see the benefits of our investment and partners’ work in terms of the homes and opportunities that are being created here. I look forward to seeing the development continue to succeed."
The HCA invested £6m in the first phase of development at Locking Parklands, taking the total level of investment by the HCA to more than £12.2m since 2002.
The planning application is expected to be determined later this year.