Recommendation needed - modern sliding door supply and install

[MiniViking]

Hello

We're looking to replace our old leaky French door at the back of our kitchen with a modern, aluminium sliding door. I've had no problems finding good suppliers for the new sliding door, but they all seem to require a builder to do the initial work of removing the old French door and preparing for the installation of the new sliding door. But the job seems to be far too small for a builder to want to take on. It seems that people usually replace their old door as part of a larger building project, which I understand but surely it's not entirely unheard of simply to want to replace a door...!

Does anyone have any useful ideas or recommendations please? Either for a company who will supply the new sliding door but also do the work on the old door. Or a builder who will do the work. Or anything else...

Thanks!

[MiniViking]

Still got nowhere with this. Any ideas or thoughts very gratefully received! Thanks