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When you say first fix, you mean cables and back boxes in, but nothing actually connected up?
I wouldn’t know where to start a with pricing it tbh. It’ll be more expensive doing it in two parts rather than pricing it as a whole job.
Are you planning to do the second fix yourself?
Nef-
When you say first fix, you mean cables and back boxes in, but nothing actually connected up?
Pretty much, yes - although the shed side of the office can be connected up, as there is no plastering / tarting up, and all the electrics will be through conduit. That's the side that would have the consumer unit too.
Also, that the SWA could be connected up at both ends, and then connected to the house CU.
In the office side, I was thinking that all the cabling would be done (for a ring, lights, underfloor heating, smoke alarm, and a placeholder for a possible aircon unit).
In my head, second fix would be connecting up the connecting up the sockets, lights, heating, once I have done the plasterboard & floor.
NotThamesWater
It's possible there will be a loooong gap until I can do second fix.