Is your bathroom leaking, and you don’t know where it’s coming from? A bathroom leak doesn’t fix itself. Every day you wait, the damage gets worse – wet ceilings, mould on walls, unhappy neighbours downstairs. So, a professional bathroom water leakage repair is a must.
Allseal Waterproofing is a trusted bathroom waterproofing specialist in Singapore that homeowners rely on – BCA approved, experienced, and ready to help.
Picking the wrong contractor means paying twice. Here’s why homeowners across Singapore call Allseal first.
We’ve been doing this for over 15 years.
In that time, we’ve fixed bathroom leaks in HDB flats, condos, landed homes, and commercial properties all across Singapore. We’ve seen every type of leak, and we know exactly how to fix each one.
What that means for you:
Yes, and this matters more than most people think.
BCA approval means our materials and methods meet Singapore’s official building standards. This is important for HDB inter-floor leakage cases, condo MCST submissions, and insurance claims.
Yes, free, no obligation, and often same day.
When you call us, a real team member picks up. We book the earliest available slot, our specialist visits, assesses the situation, and gives you a clear written recommendation. No surprises.
Most bathroom leaks in Singapore come from one of four places. Each one needs a different fix, which is why finding the right source first is so important.
Every bathroom has a waterproofing membrane under the floor tiles and behind the shower walls. It’s the invisible barrier that stops water from getting through the concrete slab into the unit below.
Over time, it can crack, separate from the concrete, or simply wear out, especially in older HDB flats.
your membrane may have failed:
Not all bathroom leaks come from the floor surface. Many come from:
Concealed pipe leaks inside a bathroom wall– Water supply and waste pipes run through your walls and under your floor. Joints and connections can fail over time, especially in older HDB flats.
Floor trap leakage – The seal around the floor drain can fail, or the floor trap body itself can crack. Every time you shower, water escapes directly into the structure below.
Signs it might be a pipe or floor trap issue:
Yes, and this surprises a lot of people.
Grout is porous. After years of hot water, cleaning chemicals, and tiny structural movements, grout lines crack and break down. Water gets underneath the tiles, through the screed, and into the slab below.
Hairline cracks in the concrete screed work the same way. They look harmless, but even a crack the width of a hair lets water through every time you shower.
Where grout and cracks usually fail:
Bathroom tile grout failure repair is one of the most common jobs we handle, and it’s often the starting point of a much bigger leak if left too long.
Inter-floor leakage is when water from your bathroom seeps through the floor slab and drips into the unit below. In Singapore’s HDB blocks, bathroom seepage from the ceiling is very common and very stressful because it involves two households, liability disputes, and formal HDB procedures.
Who is responsible?
| Situation | Who Pays |
| Waterproofing membrane failure in the upper unit | Upper unit owner |
| Concealed pipe leak within one unit | That unit’s owner |
| Shared or common pipe outside unit boundaries | HDB or Town Council |
| Damage from renovation work | The owner who did the renovation |
This is one of the most urgent situations a Singapore homeowner can face. If water from your bathroom floor is getting through the slab and dripping into your neighbour’s ceiling below, you need to act fast. The longer you wait, the more damage it causes and the bigger the HDB dispute becomes.
Yes, toilet bowl leakage repair in Singapore is something we handle regularly. A cracked toilet base, a failed wax ring seal, or a loose connection between the toilet and the floor trap can all cause water to seep into the floor structure below.
If you notice water pooling around the base of your toilet, don’t ignore it.
This is the step most contractors skip, and it’s why so many bathroom leaks come back after being “fixed.” At Allseal, our Waterproofing Specialist in Singapore team always finds the source first, ensuring the problem is properly diagnosed before any repair work begins.
We use three main methods – all non-destructive:
Thermal Imaging: A specialist camera detects temperature differences on surfaces. Wet areas are cooler than dry ones, so the camera reveals hidden moisture behind tiles and under floors without touching anything.
Moisture Meter: Measures the water content inside walls and floors. We map exactly where the moisture is and how far it has spread, giving us the full picture before we recommend any repair.
Water Ponding Test: We block the floor drain, fill the floor with water, and check after 24–48 hours. If the level drops, we know where the floor is leaking. Simple, reliable, and no damage to your bathroom.
In most cases, we can find your leak without removing a single tile. If hacking is genuinely needed, we tell you exactly why and exactly where before we start.
PU injection grouting (polyurethane injection) is the most effective no-hacking repair method for bathroom leaks in Singapore. Here’s how it works:
For occupied homes, no-hacking is almost always the better option when the leak allows it.
| No-Hacking | Full Hacking |
Disruption | Minimal | High – days of noise and dust |
Cost | Lower | Higher |
Time | Usually 1 day | 3–5 days |
Tiles | Kept intact | Removed and replaced |
Best for | Localised leaks | Widespread membrane failure |
We don’t do quick patches that fail in 3 months. Every repair we do is built to last.
Here’s what we use depending on your situation:
Got a crack in your bathroom floor or wall? This is usually our first fix.
We inject a special resin directly into the crack. It expands, fills the gap completely, and creates a strong waterproof seal from the inside. No tile removal needed in most cases. Done in a day.
If the whole bathroom floor membrane has broken down, not just one crack, we replace it completely. We remove the tiles, apply a fresh membrane, and retile to finish.
Type | Used For |
Liquid-applied membrane | Existing bathroom repairs |
Sheet membrane | Full renovations |
Crystalline waterproofing | Sealing the concrete slab |
Cementitious coating | Shower walls and wet areas |
The wall-floor junction is where most Singapore bathroom leaks start. We remove the old failed sealant, clean it properly, and reseal it with a flexible waterproof compound that won’t crack again.
For deeper structural cracks, we use crack injection waterproofing, injecting specialist resin directly into the crack under controlled pressure to seal it from the inside out.
When the damage is serious and past the point of patching, we strip everything back to the concrete, fix it properly, and rebuild. More disruptive, yes. But when it’s needed, it’s the only thing that truly lasts.
Not sure which one you need? That’s fine. We’ll inspect first and tell you exactly what’s right for your bathroom.
Bathroom leak repair cost in Singapore depends on the type of leak and how serious it is.
For small and easy repairs, the cost is usually $100 to $500. This includes minor pipe leaks or tap issues. Simple fixes like replacing a washer can cost around $50 to $150.
If the leak is hidden inside the wall or floor, leak detection may cost about $150 to $250 or more.
For bigger problems that need tile hacking and full waterproofing (common in HDB toilets), the cost can range from $600 to $1,000 or more.
Emergency call-outs may add another $50 to $100, depending on urgency.
If your flat is new, it may still be under the Defect Liability Period (1–3 years). In some older flats, the Home Improvement Programme (HIP) or Town Council may help with certain leak cases.
We always provide a free on-site inspection before giving a clear and fixed quotation. No hidden charges.
Every repair comes with a written service warranty. If the leak comes back within the warranty period, we return and fix it at no extra cost. This is written into your quotation, not just a verbal promise.
What’s Covered | What’s Not Covered |
Recurrence of the repaired leak | New leaks from different sources |
Material or workmanship failure | Damage from other renovation work |
At Allseal Waterproofing PTE Ltd, our goal is to give our clients the best service possible. Here’s some feedback from our happy customers:
“I had a persistent water leak in my bathroom, and their team fixed it quickly and efficiently. They explained everything clearly and used high-quality materials. Now, my bathroom is completely dry, and I no longer worry about water damage. Highly recommend their service!”
kelvin
“I was impressed by how fast they responded to my request. The team arrived on time, found the source of the leak, and repaired it without any hassle. The pricing was fair, and they even gave me tips to prevent future leaks. Great service!”
Edmund
“They did an amazing job fixing the leak in my bathroom. The team was friendly, professional, and very knowledgeable. They took the time to ensure everything was properly sealed and tested. I will definitely call them again if I ever need plumbing repairs!”
Williams
Simple signs to look for:
If yes to any of these, you most likely have a leak. Just call us, and we’ll come check for free.
Yes, it is, as long as it’s done correctly and used for the right situation. It’s not a temporary patch. When we inject the right resin into the right place, it seals permanently. The trick is finding the exact source first, which is what we always do before anything else.
Done properly, it lasts for years, sometimes decades. The resin we use is flexible, so even when the building moves slightly over time, the seal stays intact and doesn’t crack again. It’s a proper long-term fix, not a band-aid.
Whoever caused the leak pays, not whoever is suffering from it. So if your bathroom floor membrane failed and water is dripping into your neighbour’s ceiling, that repair is your responsibility. HDB sends an inspector to figure out who’s responsible, and then that person gets the repair notice.
Sometimes yes, sometimes no. Small repairs fully inside your own unit are usually fine without approval. But if the work touches shared structures or common areas, your condo management needs to know. Don’t worry, though. We’ll tell you exactly what’s needed after the inspection, and we handle all the coordination for you.
It depends on your bathroom size and the type of membrane needed. Most Singapore homeowners pay somewhere between $800 to $3,000. The best way to know your exact cost is to get a free inspection first, so we can give you a clear fixed price
If we’re doing no-hacking PU injection, we’re usually done in one day. If the whole bathroom floor needs to be hacked out and a new membrane laid, that takes around 3 to 5 days. We’ll always tell you the timeline upfront before work starts so you can plan around it.
Yes, call us any time, day or night. If water is actively dripping through your ceiling or you have a sudden burst pipe, don’t wait. We respond the same day across all of Singapore and get someone to you as fast as we can.
Have a bathroom leak? Contact us now for a free inspection.
Call for urgent cases, WhatsApp for fast response, or book online for a scheduled visit.
BCA approved, no-hacking where possible, and a written warranty provided.
Allseal Waterproofing PTE Ltd, your trusted partner for all waterproofing needs. Based in Singapore, we provide expert solutions for leaks and dampness. Contact us for unparalleled service.
