Recently when I called contractors from classified adverts for quotes to repair tiles in my SG place, a few of them said they are actually in JB! Wonder did they just come over from JB to do business or all along all the renovation contractors in SG are from JB?!
They have been around for ages. Typically they work on your house for 2 to 3 weeks, then they cook up some story (in my case they said one of the worker have to go back JB get married)... they then work 2 to 3 weeks in JB and back again in SG.