Is installing urinator (like the one in those mall2 men room) is allowed by the HDB ?

anyone can tell me how much to install one ?

I think it is call urinal.

Is there a need at home?

You can only use the urinals for doing small business. For big business, you would need the full WC. As space is a premium, especially in the toilet, it does not make sense to install both a urinal and a water closet.

no problem installing a urinal in hdb flat.

but my contractor warns me that there will be SMELL bcos of the structure of the sewage pipe(the curve part). Urine will be stuck and collected at the curved part, unlike a toiletbowl, there is enough water+pressure to flush the dirts over the curve. a Urinal doesnt have the kind of pressure to push over the curve...thats why got smell.