generally avoid calling contractors who put their namecard / pamplet in your letterbox.
As for those who approach u in person, 50% are vultures, 50% are sincere,
if u mean a polite person selling their services to you, try to check for recommendations
online. if dun have, u may rather rely on actual recommendation from ppl like relatives,
best frens, or even lowyat.

But take recommendation at a pinch of salt. contractors sometimes have mood swing also.

setia eco garden is rather nice, but very far
i can introduce you contractor, quite a few lowyat guys already approach him, and i think
2-3 ppl already engaged him to do work already. Always rem, if you don't like the contractor
way of presenting to you, avoid them then.