# Toilet Waterproofing Singapore | Membrane, Screed, Ponding Test | Seepwise > Toilet waterproofing in Singapore: new membrane, screed and a ponding test, HDB permit rules for hacking, and published 2026 price ranges. Request a quote. URL: https://waterproofing.affiliateinsider.buzz/toilet-waterproofing/ - Home - / Toilet waterproofing # Toilet Waterproofing in Singapore A wet area that stays dry for years needs three things done in order: membrane, screed, test. [Request an inspection](#request) Last updated: 2026-10-10 [Seepwise](/) arranges toilet waterproofing in Singapore for HDB flats, condos and landed homes, from a single leaking toilet to a full re-waterproof during renovation. The work matters because the toilet is where most inter-floor leaks start: HDB names bathrooms and toilets as the usual source in older flats ([HDB](https://www.mynicehome.gov.sg/hdb-how-to/maintain-your-flat/)). ## What happens on the first visit The first visit checks whether the toilet is already leaking (moisture readings on the ceiling below if accessible, grout and floor-trap condition, tile hollowness) and whether you need a full re-waterproof or a targeted repair. For HDB flats, the specialist confirms whether hacking is involved, because that needs a permit applied for by the renovation contractor. ## What proper toilet waterproofing involves A full job removes the old tiles and screed, prepares the slab, lays a waterproofing membrane across the floor and up the walls, then screeds and re-tiles. Published HDB-flat guides describe the membrane turned up the walls (figures from 150 mm to at least 300 mm are cited) and a ponding test, where the floor traps are blocked and the floor is flooded for a minimum of 24 hours before any tile goes down ([guide](https://megafurniture.sg/blogs/articles/old-hdb-toilet-renovation-a-practical-buyers-guide-for-singapore-homes)). The ponding test is the step most often skipped, and it is the only one that proves the membrane holds before it is buried under tiles. ## HDB rules before you hack a toilet floor Hacking bathroom floors generally needs an HDB renovation permit, applied for by your renovation contractor ([Hometrust](https://www.hometrust.sg/articles/renovation-permits-what-you-need-a-permit-for-and-how-it-works/)). New flats carry a 5-year warranty on ceiling leaks, and HDB states it ceases if floor tiles are changed or the waterproofing system is tampered with ([HDB](https://www.mynicehome.gov.sg/hdb-how-to/maintain-your-flat/)). Guides also note that wet-area floor tiles in new flats should not be changed in the first three years ([Hometrust](https://www.hometrust.sg/articles/renovation-permits-what-you-need-a-permit-for-and-how-it-works/)). If your flat is still inside those windows, report a leak to HDB before touching the tiles. ## Overlay tiles are not waterproofing Laying new tiles over old ones avoids hacking and the permit, and it is a common renovation shortcut. It does nothing for a membrane that has already failed: water still finds the slab underneath. If the toilet is leaking now, the fix is under the tiles, not on top of them. See [hacking vs non-hacking waterproofing](/guide/hacking-vs-non-hacking-waterproofing/). ## What is included - ✓Leak check before quoting - ✓Permit handled by the renovation contractor for hacking - ✓Hacking and debris disposal - ✓New membrane turned up the walls - ✓Screed laid to fall toward the floor trap - ✓Ponding test of at least 24 hours - ✓Re-tiling (quoted separately if you choose new tiles) - ✓Photo record of each layer before it is covered ## Painting over it vs a quick fix vs a proper repair DIY Quick fix Proper repair Membrane Paint-on sealer Thin coat, floor only Full membrane up the walls Ponding test No Often skipped 24 hours minimum HDB permit for hacking Not applied Sometimes skipped Applied by the contractor Fixes an existing leak No Sometimes Yes, the membrane is renewed Evidence for later None None Photos of each layer ## What it costs Published 2026 ranges per toilet: waterproofing package S$800 to S$2,500; hacking and disposal S$800 to S$1,500 ([Triton](https://www.tritoncon.sg/blog/waterproofing-cost-singapore), [PRDT](https://www.prdt.com.sg/blog/bathroom-renovation-cost-singapore/), [Hock Star](https://hockstar.sg/bathroom-renovation-cost-singapore/)). Full HDB toilet renovations are quoted higher, around S$5,000 to S$8,000 in one 2026 guide ([MoneyBees](https://themoneybees.co/blog/hdb-toilet-renovation)). [Try the cost estimator](/tools/waterproofing-cost-estimator/) or read the [waterproofing cost guide](/guide/waterproofing-cost-singapore/). ## Related guides - How Much Does Toilet Waterproofing Cost in Singapore (2026)? - Do You Need an HDB Permit for Toilet Waterproofing? - What Is a Ponding Test, and Why Does It Matter? - Is My BTO Leak Covered by HDB's Warranty? ## How it is done - Check. Is it leaking now, and is a full re-waterproof needed? - Permit and plan. Permit for hacking in HDB flats, schedule agreed. - Membrane and screed. Old layers out, membrane up the walls, screed to fall. - Ponding test, then tiles. Flood test for 24 hours or more, then re-tiling. Water dripping now? Switch off any circuit near the drip, put a bucket under it and photograph the stain with the time. Then send a request and tick "dripping right now". [What to do in an active leak](/emergency-leak-repair/) Standards and methods - Moisture mapping before quoting - Ponding test 24h+ on wet areas - Membrane turned up the walls - HDB permit for hacking, via the contractor - BCA workhead CR13 for waterproofing installers Request toilet waterproofing A specialist calls you back to book an inspection. Request received. A specialist will contact you on the number you gave. If water is near electrics, switch off that circuit at the distribution board and keep clear until then. Get toilet waterproofing quoted after a proper inspection. A specialist calls you back to book an inspection. Tell us what you see and the type of home. [Request an inspection](/contact/#request) ## Questions people ask How much does toilet waterproofing cost in Singapore? + Published 2026 contractor guides put a waterproofing package of membrane, screed and ponding test at about S$800 to S$2,500 per toilet, with hacking and disposal another S$800 to S$1,500. Re-tiling and GST may be extra. Do I need an HDB permit for toilet waterproofing? + If the floor is hacked, generally yes. The permit is applied for by your renovation contractor, not by you. Can I re-tile my new BTO toilet? + Changing the wet-area floor tiles can end HDB's 5-year ceiling-leak warranty, and guides advise not changing them in the first three years. Check your flat's dates first. What is a ponding test? + The floor traps are blocked and the bathroom floor is flooded for at least 24 hours to prove the new membrane holds before tiles cover it. Is there a charge for sending a request? + No. Sending a request costs nothing. The specialist explains any inspection fee before the visit. ## Related services [Ceiling leak repairFind where the water enters, fix it at the source, and know who pays before work starts.](/ceiling-leak-repair/)[PU injection leak repairSeal the crack the water travels through, without hacking the floor. Good for the right leak, wrong for a failed membrane.](/pu-injection-leak-repair/)[Spalling concrete repairCracked or bulging ceiling plaster over rusty steel is spalling. It spreads if left.](/spalling-concrete-repair/)