How much to wire up shed for electricity?

Exactly. Also "notifying building regs" is typical wording used in England. You don't notify building regulations (or more aptly referred to as "building control" in UK) in Ireland when doing electrical work, you just get an electrician to do the work and they will write out a cert and give it to you once done.

It's usually when you get house insurance renewed that the insurer will ask you have you got extra work done in your house in the past year? If you reply yes you got shed wired up, then they will ask you to forward on to them a photo of the cert.

If you answered the insurer "no, you got nothing extra done to house (including shed etc)", they will be none the wiser. But if a problem arises in the house over Anything - following on from then including problems with the electrics in the shed etc affecting the fuse box in the house- don't go looking for insurance claim as you will be screwed as you mislead the insurance company when renewing insurance and even worse you don't have an electrical certificate for the extra done in shed. Even if the insurance claim is nothing to do with the electricity there's a good chance that the insurance assessor will notice the shed wired up etc. Then again they may not notice it but you leaving your self exposed to it being found out which will void your insurance. The chances of doing this is very high all for short term gain etc.

There's so many times this happens but you never hear about it publicly. People in the scenario I've explained happens A Lot but nobody will ever admit they in sh1t street with their home insurers over cowboy builders and sometimes it's people you'd never guess! The goody two shoes/know it alls people in your neighbourhood!

Also if you decide to tell the insurance company in the following years that the shed is wired up, they will ask for the certificate. Good luck trying to get an electrician to certify the work a few years later - which in Ireland they'll be reluctant to do, unless ripping holes in walls to identify the method of wiring done in order to satisfy themselves to issue a cert.

Much better advice as already listed above is to get the job done right by an Rec and then get a certificate.

Seems Linaclare is getting information online from English websites.