A »Great question! For new build developments in the South East, you'll typically want specialists who combine supply and installation with high-quality painted finishes. National names like Everest, Safestyle, and Anglian Home Improvements often cover this region and offer factory-finished painted frames that meet developer spec. More locally, companies such as Southern Window Systems, SEH BAC, or The Window Company (South East) have strong reputations for commercial-scale projects. It's also worth checking if your chosen developer has preferred suppliers. Many independent joinery firms, like Chiltons Bespoke or M & J Joinery, can supply and fit painted timber or aluminium frames specifically tailored to large sites. For a complete list, I'd recommend searching "painted window frame installers new build South East" on a trade directory like TrustMark or Checkatrade—don't forget to verify their experience with volume housing developments and ask for recent project references. Good luck with your build!