use free noticeboards in supermakrets and local shops, offer free quotations, no call out charges, no job too big or small on the notice
advertisement is probably key here so he can get his name around a community so they will call him first if they need someone.
also try pickapro.ie and tradesmen.ie, maybe even pluspoint.ie
maybe contact previous people he worked with to get some work or previous jobs he did to see if they know anyone looking for a job done etc. word of mouth is key in times like this.