This is likely preparatory works for the new Duchy of Cornwall estate being built within the A2, Selling Road, and the M2. I'll mark this as resolved for now since I don't think that main construction is underway yet and so tagging this as landuse=construction and construction=residential would be premature. That being said, preparatory works for the Lower Thames Crossing have been marked as landuse=construction by other mappers, so you could do this here if you want but I would advise against it.