I engaged Yap Peng Kim (012-329 1682) this year to do my toilets (retiling, general fixes & plumbing) after reading your reviews about him on LowYat, how good la, how polite, great work done.
But it turned out to be a nightmare, where not only he NEVER showed up even once after getting the contract but his contract workers were not even doing any work, and after taking more than a week to break my toilet tiles, I had to step in and ask him. Turns out his supervisor, Chong Chee Onn (016-332 2826) also wasn't on site, unlike Yap’s promises.
Yap did sloppy work on my toilet, didn’t know much about plumbing, didn’t fix the heater hose properly, just did a half past six job, even didn’t finish the tiling properly, never added grouting for most of the tiles. But he was very busy promoting his relative’s shop to me to buy things from them (some Ga Hing Trading), instead of working on my toilet. Our toilet leaked once they fixed the sink, and his workers didn't even inform us even while we were on-site. We found out from management about this leak due to complaints from our downstairs neighbour. We had to follow up with him AND his workers to repair the leak and do our own water ponding test to check if it was fixed or not. He even told us another nonsense story about his supervisor left and he was so busy with other contracts he had.
When asked on the progress, he always said "don’t worry, small matter", for a work he promised to finish in 2 weeks, took more than a month and a lot of our own time to supervise- he never once came to supervise on his foreign workers, even after I asked him to check on the work done, as it was quite sloppy, he kept giving excuses to not come and check. He even said he thought we were not serious about the date that was discussed and agreed upon in the contract.
Worse is the lighting to our toilets, it was done in a really bad way, that the housing fell after a few months and we found out from another electrician that we engaged that the bulbs were not fixed and were free-hanging.
He is very condescending towards females, and will launch a tirade justifying why his workers haven’t finished the work within the deadline, but won’t address the actual issue with you, which is to ask his workers and supervisor to be on site and DO WORK! And by do work, I mean do QUALITY WORK, not sloppy work!
Towards the end, he instructed his workers to hide my house keys, and wanted us to pay in full asap (before inspecting) and launched a BS story about his deputy Chong stealing my keys, and he lodged a police report on his deputy. He STILL did not want to meet us to inspect the unit for defects together before we make the payment! Really a nightmare to hire Yap Peng Kim! Stay away from him at all cost! NEVER AGAIN

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A word of advice to the rest of you, please do remember to add in a clause in your renovation contract about penalty for late delivery of the property.
I have been telling people don't believe too much the so called "recommended" and "best" contractors in this forum. Every time I see people asking for dumb question for best, good price/cheapest contractors without doing any research themselves I just see disasters are happening.
Some of the people doing the recommendations are actually contractors in disguise. Some of you need to wake up.
I sympathize with your problem but I really doubt you have done enough evaluation of the contractor before you engaged him. Did you check the previous work/references? Did you have good detailed requirements and instructions? Did u monitor the work? Judging by last advice I doubt you have done any. Not many renovations projects sign contracts. You are demanding a toilet renovation project to have a signed contract? Good luck. I assume you are not living in a palace?