In reply to d508934:
Methinks somebody is having a laugh.
Sounds like nearly twice what I would expect.
Apart from himself ,who I assume is the joiner ,there's maybe a few days for a plasterer ,day most for the sparky ,and same for the plumber.
If its the same layout as before , + few more power points.
Potential for fallouts ,but its your hard earned and you don't want to get ripped off.
A friendly ,and honest query "your quote is a bit more than I was expecting . Could you maybe give us a breakdown of your labour" is the best way forward.