If a previous certificate exists, consumer unit upgrades for warehouses & trade units usually starts by checking whether it still reflects reality. Owners often ask whether this can wait. Sometimes it can, and where invoice routes to the business as standard. Split billing is the only finding we will say so plainly. It is the difference between a fixed price and an estimate.
We work to the current edition of BS 7671 and note where an older installation departs from it and why that matters. Nothing about it is unusual for property of that age. Consumer unit upgrades for warehouses & trade units is one of the more commonly misquoted jobs, largely because nobody tests before pricing it.



