It is highly advisable and often legally required to hire expertise (specifically, a PUB-licensed plumber) for plumbing work in Singapore. While some very minor tasks might be manageable for a DIY enthusiast or an unlicensed handyman, for the vast majority of plumbing issues and installations, engaging a qualified professional is crucial for safety, compliance, quality, and long-term cost-effectiveness.   

1. Legal Requirements and Regulations:

   • The Public Utilities Board (PUB) in Singapore strictly regulates plumbing works. Since April 1, 2018, only PUB-licensed plumbers are permitted to carry out major water service and sanitary plumbing works. This includes installations, repairs, and alterations of water pipes, drainage systems, sanitary fixtures (like toilets and sinks), and any work involving the main water supply or discharge pipes.   
     
      
   • For homeowners, especially those living in HDB flats, specific guidelines mandate engaging licensed plumbers for certain renovations and repairs that affect the plumbing system. Ignoring these regulations can lead to penalties and unsafe conditions.   
     
      

2. Safety and Health:

   • Plumbing involves working with water supply and waste disposal systems, which can pose significant health hazards if mishandled (e.g., cross-contamination of potable water, exposure to sewage).
   • There’s also the risk of electrical hazards when plumbing work is near electrical outlets or appliances, and the danger of injury from tools, hot water, or pressurized systems.   
     
      
   • Licensed plumbers are trained in proper safety protocols and techniques to mitigate these risks.

3. Expertise and Quality Workmanship:

   • Plumbing systems are complex. Professional plumbers possess the in-depth knowledge, training, and experience to accurately diagnose problems, understand the underlying causes, and implement effective, long-lasting solutions.   
     
      
   • They know how to work with various pipe materials, fittings, and fixtures, ensuring proper installation and sealing to prevent leaks and other issues.   
     
      
   • Unlike temporary DIY fixes, a professional aims for a permanent solution, preventing recurring problems.   
     
      

4. Advanced Tools and Equipment:

   • Licensed plumbers have access to specialized tools and equipment that are not typically available to the average homeowner. This includes leak detection devices, pipe inspection cameras (for identifying clogs or damage within concealed pipes), hydro-jetting equipment for stubborn clogs, and proper safety gear. These tools allow for precise diagnosis and efficient repairs.   
     
      

5. Prevention of Costly Mistakes:

   • Attempting complex plumbing work yourself without proper knowledge or tools can easily lead to costly errors, such as:
     
     • Worsening the original problem: A minor leak could become a burst pipe.
       
        
     • Water damage: Improper sealing or connections can lead to leaks that damage walls, flooring, furniture, and promote mold growth.
     • Structural damage: Long-term leaks or incorrect alterations can compromise the building’s structure.   
       
        
     • Voiding warranties: DIY repairs on appliances (like water heaters) or fixtures might void their manufacturer’s warranty.   
       
        
     • Increased utility bills: Undetected leaks can significantly inflate your water bills.   
       
        
   • While professional services have an upfront cost, they often save you more money in the long run by preventing these expensive consequences.