I had 2 issues within a 2 days. One was a leaking sound behind a cabinet in the morning, so I googled for a "recommended plumber singapore" and picked the first result. They quoted $180-$280 - I thought it was a bit steep but no choice as the leaking sound seemed quite bad and I had a flight to catch in a few hours. They came round 3 hours later and charged me $220 to replace about a foot of piping. I missed my flight as a result and had to forego my trip completely.
The second issue on the next day, was a small drip leading to our water heater. This time it wasn't as urgent so I did some shopping around for quotations. First my wife recommended Carousell so I did a search for "leaking pipe" and picked the only listing (ad with $30) with that search term and messaged them. They came back with a quote of $250 per metre . I did another search for "plumber" and picked some "uncle". They initially replied 4 hours after my initial message and then took another hour and a half to say that they were busy and couldn't make it till next week (it's a Monday today).
I continued searching using Google and ended up on Singapore Plumbing Society website that lists their members but there were too many to choose from and I didn't know who to choose. So I finally ended up on PUB website and clicked their "Search for a Licensed Plumber". The beauty of this website is you can search by area code so that you can find a plumber near you. You just need to put in the first 2 digits of your area code.
I called a couple of phone numbers but some of them don't answer or hang up on you. Some don't put working hours or only work till 6pm so I ignored those. In the end I chose Mr WONG PANG FEI (aka Jackie Wong) who lived down the street from me. He called back straight away after initial missed call. I told him the situation and he quoted me $60. Around the appointed time he came and did a fuss free replacement. Besides Mandarin and English, he also speaks Cantonese (I am from Hong Kong). I would highly recommend him as his rates are more than reasonable and if you are in Sengkang or Punggol he will give free quotations without transport charge (he rides his bicycle to your house).
I normally don't write posts and you will notice this is my first. Anyway I was so happy with his service that I was compelled to write this recommendation in this forum. His business is called Happy Star Electrical and Plumbing and you can reach him at 81334507. I hope he gets more business as a result. Cheers.