Here is how consumer unit upgrades on a period flat works at a Merthyr Tydfil address, including the parts that decide the price. That is the standard we quote to. If you have had conflicting advice, it is usually because someone quoted without checking certificate at the end, delivered the same evening. Two electricians looking at the same readings tend to agree. Neither of us benefits from finding that out halfway through.
If the property is tenanted, the visit is arranged around access rather than around us, which usually means confirming times with whoever holds the keys. The paperwork explains it in the same words we would use on site. What matters for consumer unit upgrades on a period flat is the condition of this installation, not the average condition of installations generally.



