Hmmm. you're not the first person to tell I'll ask in another thread, for specifc Scottish Regs advice, as this one is primarily about the cost.
I think that sufficient leads to information, has been given on the requirement for building warrants and how to accomplish that. A major problem in Scotland is that there is no part P, the standards are dismal in comparison to those in Wales and England, not only because of non-compliant work by unqualified persons but also because of those working for registered electrical contractors, (moreso than Wales and England).
Many so-called electricians in Scotland, think that the latest regulations don't apply to them, I continually come across flagrant departures from BS7671: 2008, the most prevalent, being in regard to the lack of RCD protection for additional work.
I am a registered, approved contractor and a sole trader in Morayshire, my
electrical qualifications include an electrical apprenticeship, HND in electrical power and City & Guilds 2382 and 2391. I moved back recently from overseas (and latterly England), to get some elbow room.
I was operating to part P in England.
A common complaint by those with degrees of any discipline (including electrical), is that they think that because domestic installations requires comparatively low skills and educational requirements, it's easy. It does however require study of BS7671 and some practical experience as a minimum requirement, to
competently carry out basic domestic work.
I have recently carried out a few periodic inspection reports on properties, at the request of the occupant, who is moving on from a council property. Alterations were made that required a non-existent building warrant, e.g. an extension or conservatory. The council (in Morayshire), has fined these people and now insist on proof that the electrics are in conformance, hence the PIR's ............... which were a fail in every case!
Regards