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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-
I’ll be honest, most sparks I know aren’t interested in doing half the job for you to finish up (I might be misunderstanding you on this, if so ignore me). Having a break while it’s boarded and plastered is one thing, but they won’t want to leave work to be completed by a non-spark. It’ll need to be tested once second fixed before it gets put into service.
You’ll need to get quotes for the whole job, breaking it into small pieces makes it a lot less desirable. Having a gap for works to be completed is fine as long as they know the schedule.
Nef
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?