hi peihao83,
 
	warranty covers in the things they do, like ceiling, carpentry, tiling, plumbling, etc... 
	included false ceiling as well..  well i have compared abt 7-8 coys before finalising it. 
	so i guess its ok. moreover the most important thing is the person. 
	if u feel comfortable with him , thats the most important thing to me. 
	but anyway thanks for ur advise too.. greatly appreaciate.