AKSG provides waterproofing and leak repair for HDB flats, condos, landed homes and commercial buildings across Singapore. We trace each leak to its source first, then fix it with the right method, whether that's a no-hacking nano treatment, PU injection or full re-waterproofing with a new membrane.
Last updated November 2026
Our waterproofing services
Toilet / Bathroom Waterproofing
A leaking toilet usually shows up in someone else's ceiling first. We trace the source and reseal your bathroom so the water stays where it belongs.
Learn more →Nano Waterproofing
Stop minor bathroom and balcony seepage without tearing up your tiles.
Learn more →Ceiling Leak Repair
A ceiling leak is stressful, especially when it involves a neighbour. Here's how to find the cause, who's responsible, and how it gets fixed.
Learn more →Roof Waterproofing
Singapore's heavy rain finds every weak point in a roof. We repair leaks at the source and waterproof flat roofs so they stay dry through monsoon season.
Learn more →HDB Waterproofing
Leaks between HDB flats cause headaches for both neighbours. We find the source fast and fix it within HDB's rules.
Learn more →Commercial Waterproofing
A leak in a commercial space means damaged stock, unhappy tenants and downtime. We fix it with minimal disruption.
Learn more →Why most leaks come back
The most common reason a leak returns is simple: the wrong spot was fixed. Water travels. A stain on your ceiling might start at a cracked floor trap, a failed joint along the bathroom wall, a gap around a pipe, or the roof two floors up. Sealing the area where the stain appears rarely solves anything.
That's why every job starts with finding the source. We look at where the water shows up, when it appears (after showers, after rain, all the time), and test the likely entry points before recommending a fix.
Which waterproofing service do you need?
| Your problem | Likely service |
|---|---|
| Stain or dripping on the ceiling below a bathroom | Ceiling leak repair and toilet waterproofing |
| Minor seepage through tiles or grout; you don't want to hack | Nano waterproofing |
| Bathroom keeps leaking even after sealing; old tiles | Full re-waterproofing |
| Top-floor or landed home leaks after rain | Roof waterproofing |
| Leak in a shop, office, F&B outlet or warehouse | Commercial waterproofing |
The main waterproofing methods compared
| Method | How it works | Best for | Hacking? |
|---|---|---|---|
| Nano / penetrating sealant | Clear coating soaks into tiles and grout, forming a water-repellent barrier | Minor seepage through tile joints | No |
| PU injection (grouting) | Polyurethane resin is injected into cracks or under tiles, where it expands and seals the gaps | Specific cracks and leak points | No (small drill holes) |
| Membrane re-waterproofing | Old finishes are removed, a new waterproofing membrane is laid and water-tested, then re-tiled | Failed original waterproofing | Yes |
| Roof coating / membrane | Liquid-applied or sheet membrane over the roof surface | Flat concrete roofs and terraces | Usually no |
No single method is "the best". The right one depends on where the water is getting in and how far the damage has gone. A surface coating over a failed membrane only delays the problem, while full hacking for a single cracked joint costs more than it needs to. We'll explain the options and why we recommend one.
What affects the cost
- Hacking or no hacking: removing and replacing tiles is the biggest cost driver
- Area size: a small toilet vs a large bathroom, balcony or roof
- How the leak is reached: access, floor level, and whether the ceiling below needs repair
- Materials: type of membrane, coating or tiles used
- Permits and rules: HDB renovation permits and timing rules where hacking is involved
Send us photos on WhatsApp and we can usually tell you which method applies and give a price range before visiting.
HDB, condo or landed: what's different
HDB flats: hacking floor or wall finishes needs an HDB renovation permit, and newly completed BTO flats have a 3-year restriction on removing bathroom finishes. Ceiling leaks between two flats are usually a shared responsibility of both owners. See our ceiling leak guide. Leaks from the roof of a top-floor flat are handled by the Town Council, because the roof is common property.
Condos: check with your management office for renovation rules and working hours. Leaks from common areas are the MCST's responsibility.
Landed homes and shophouses: roofs, gutters, parapet walls and external walls are the most common leak sources. These are covered under roof waterproofing.
How we work
- InspectWe find where the water is actually coming from: tiles, grout, floor trap, pipes, walls or roof.
- QuoteYou get a clear written quote with the method and timeline before any work starts.
- RepairWe fix the source with the right system: nano sealant, PU injection, membrane or roof coating.
- TestWhere the method allows, we water-test before handover so you can see it holds.
Frequently asked questions
How do I know where my leak is coming from?
Note when it appears: after showers usually points to a bathroom; after heavy rain points to the roof, walls or windows; all the time may mean a pipe. An inspection confirms the source before any work starts.
Can waterproofing be done without hacking?
Often, yes. Minor seepage through tiles and grout can be treated with nano sealants or PU injection. If the waterproofing membrane underneath has failed completely, re-waterproofing with hacking is the lasting fix.
How long does waterproofing take?
No-hacking treatments are usually done in about a day. Full re-waterproofing takes longer because the membrane must cure and be water-tested before re-tiling. You'll get the timeline in your quote.
Do you work on HDB, condo and landed properties?
Yes, plus shophouses and commercial buildings across Singapore.