I have used Doctor Plumbing to install gas fittings and water taps on to balconies of my apartments which didn't have them. They do the work fast and efficiently and you know what you'll have to pay as he gives a clear quote before hand, so no surprises.
I have found them to be polite, on time and their work is of good quality. Speak to Bachir the owner for a quote.
They do a full range of jobs from Plumbing, Drainage, Gasfitting and Roofing.

Approximate cost: $125.00