I don't know about an electrician, but I can recommend an alarm installation guy. The company is called Safenet Systems, the contact is Stuart.
- ph: 8167982
He's based in Howth. He has installed a few alarms in the Watermill, you've probably seen his flyers in the postboxes.
It may be too late but I used a company called securicom(01 8900025) and they were very good for my alarm installation and not overly expensive either. The electrician was a friend so I can't help you there either.