Allow me:
Certification by a building control body
- 3.8 If an installer is not a registered competent person and has not appointed a registered third-party certifier, then before work begins the installer must notify a building control body.
Yep not disputing that, and you have corrected me there. However, 3.8 is a section from Part P of the Building Regulations 2010.
The actual offence is Failure to comply with the Building Regulations, Section 35 of The Building Act 1984, a criminal offence.
From the Electrical Safety Council;
Who is responsible for making sure that electrical work in your home meets the requirements of Part P?
By law, the homeowner or landlord must be able to prove that all electrical installation work meets Part P, or they will be committing a criminal offence. (no citation)
From the Government Planning Portal;
1) First, if a person carrying out building work contravenes the Building Regulations, the local authority may prosecute them in the Magistrates' Court where an unlimited fine may be imposed (sections 35 and 35A of the Building Act 1984). Prosecution is possible up to two years after the completion of the offending work. This action will usually be taken against the person carrying out the work (builder, installer or main contractor).
2) Your responsibilities;
With all building work, the owner of the property (or land) in question is ultimately responsible for complying with the relevant planning rules and building regulations (regardless of the need to apply for planning permission and/or building regulations approval or not).
Therefore, failure to comply with the relevant rules will result in the owner being liable for any remedial action (which could go as far as demolition and/or restoration). The general advice is to always discuss your proposals with the relevant Local Planning Authority and Building Control Service before starting work.
(Please read replies from my LBC, # 261 & 262)