Documented bathroom lines run from around S$4,000, and whether the waterproofing membrane is broken decides almost everything above that.
A toilet renovation Singapore homeowners commission starts around S$4,000 in documented lines, and is really a waterproofing decision wearing tiles. Overlay keeps the membrane intact and the cost contained; hacking to the screed means re-waterproofing, re-screeding and making good. New flats also carry a three-year restriction.
01 PERMIT
Hacking always
needs one
All demolition and hacking of walls, partial or complete, needs HDB’s prior written approval before anything starts.
hdb.gov.sg · read 2026-08-31
02 HOURS
Mon to Fri
9am to 5pm
Restricted works only. General works such as painting and screed run Monday to Saturday until 6pm.
hdb.gov.sg · read 2026-08-31
03 DEADLINE
3 months for
a new block
From the date the permit is granted. Existing blocks get 1 month.
hdb.gov.sg · read 2026-08-31
Tiling, sanitary ware, a shower screen, the tap and shower set, and underneath all of it the waterproofing and the falls that send water to the trap.
Everything visible sits on top of one invisible layer. That layer is the job, and the rest is finish selection.
An hdb bathroom renovation and a bathroom renovation Singapore-wide are the same job under different names. The rules that bind it come from the flat, not from the vocabulary.
Two very different numbers hide behind one question, depending on whether the membrane is broken.
| Item | Reported range |
|---|---|
| 3-room BTO | S$25k to 50k |
| 4-room BTO | S$51k to 62k |
| 5-room BTO | S$40k to 115k |
Whole-project bands with their sources and dates. Bathrooms sit inside these totals and are among the least compressible rooms.
Sources interiordiary.com.sg 2026-08-31qanvast.com 2026-08-31moneysmart.sg 2026-08-31
Use these as context rather than as a bathroom price. Ask any quote whether it assumes an overlay or a hack before you compare it to anything.
Any toilet renovation cost figure you read online should say which of the two it describes. Most do not, which is why the same room appears at wildly different prices.
Not by the tile. A bathroom is priced by area, by whether the membrane is disturbed and by how many plumbing points move.
Those three explain nearly the whole spread between two bathroom quotes. Tile choice moves the number far less than any of them.
For an overlay with new fittings, often yes. For a hack to the screed with the waterproofing renewed, that budget rarely survives contact with the quote.
The dividing line is the membrane, not the finish. Any figure quoted without saying which side of that line it sits on is not a figure you can use.
There is no such status. The Housing & Development Board registers firms in its Directory of Renovation Contractors; it does not approve, endorse or rank them.
A bathroom renovation contractor is bound by the same register as any firm doing a whole flat. There is no lighter category for single-room work, and no separate approval to hold.
Under the Housing and Development (Renovation Control) Rules 2006. Bathrooms are the room where an unregistered job is most likely to become somebody else's ceiling.
Five things. A bathroom line missing any of them is not comparable to the line beside it.
Ask whether a water test is included and how long it is held. A membrane that is never tested is a membrane nobody has confirmed works.
Put all five on the renovation quotation itself. An itemised quote is the document you will be holding if anything is disputed, and a chat thread is not.
Newly completed flats carry a restriction on removing bathroom floor finishes, which is why the room you most want to change has the least freedom in its early years.
The three-year bathroom restriction is the rule people meet late and resent most. Check it against your own flat before you plan anything, because it decides overlay against hack for you.
The restriction exists to protect the original waterproofing during the period when defects would otherwise surface. Overlay is normally the route within it.
Tiling and fitting are general renovation works, Monday to Saturday 9am to 6pm. Hacking tiles is restricted works, Monday to Friday 9am to 5pm only.
Sources MyNiceHome by HDB 2026-08-31
A hacked bathroom therefore spends its noisiest days in the narrowest window of the week, which is one more argument for an overlay where the condition allows it.
Three months in a newly completed block, one month in an existing one, from the day the HDB renovation permit is granted.
Tell us the flat type and when you collect keys. You get a scope discussion and an indicative cost band within one working day.
or email hello@btorenovation.sg
Early and slow. Bathrooms start near the beginning and finish near the end, and everything in between depends on the waterproofing being right.
Build the renovation timeline around the water test rather than around the tile delivery. It is the stage with no substitute and no shortcut.
The waterproofing system and the sanitary ware. Tiles matter aesthetically and barely move the total.
Ask what happens at the junction between the floor and the wall. That detail is where most bathroom leaks begin, and it is almost never in a quote.
If your flat kept its Optional Component Scheme sanitary fittings, say so early. It changes what is being replaced and therefore what a bathroom renovation cost Singapore quote should contain.
Tiles and sanitary ware are ordered rather than fabricated, so the lead time is delivery rather than manufacture. Specialist tiles can still run weeks.
Select and confirm the tile early. A bathroom held up waiting for a discontinued tile is the most avoidable delay in the whole flat.
Bathrooms are small enough that a few centimetres change what fits. A vanity chosen from a showroom can be the wrong width for the wall it is going against.
All of that is knowable from the measure. None of it is knowable from a showroom, which is why the order of those two visits matters.
Bathroom failures are the slowest and the most expensive in the flat, because they surface somewhere else.
Every one of them traces back to the waterproofing stage, which is precisely the stage that is invisible by the time you take handover.
Get the defects liability period in writing, and ask specifically what it says about water ingress rather than about tiles.
Any electrical work for a heater or a fan needs a worker holding an Energy Market Authority licence, separate from the firm’s own registration.
Repairing a wall or ceiling after a leak is investigated takes materials and labour. If it is not a named line, it was not priced.
The bathroom depends on hacking and plumbing first fix. Flooring elsewhere in the flat depends on the bathroom threshold level being settled.
We walk the flat after key collection, measure every run, and write down what you want changed and what HDB will let you change.
Your contractor files the electronic application. Wall demolition needs the flat’s floor plan submitted with it.
Demolition, tiling and anything touching the bathroom happen first, inside the restricted-hours window.
Kitchen and wardrobe carpentry is fabricated to a fixed specification, then installed, then painted.
Tie payments to stages you can inspect. The water test is the most important inspection in the room and the easiest one to skip.
Ask to see the water test rather than to be told about it. It is a stage you can photograph, and photographs are what settle disputes later.
Tell us the flat type and when you collect keys. You get a scope discussion and an indicative cost band within one working day.
or email hello@btorenovation.sg
Normalise the assumption first. An overlay quote and a hack quote are not two prices for one job, they are prices for two different jobs.
Once matched, the remaining gap is usually the waterproofing system and whether a water test is included. Both are worth paying for.
Ask for the workmanship warranty in writing too, and check whether a bto renovation package that includes this room carries the same terms as a standalone job. Frequently it does not.
A bathroom fit-out cannot move a soil pipe, cannot enlarge the room and cannot undo a three-year restriction that applies to your flat.
Plan within those constraints rather than against them. A good small bathroom is a far better outcome than a compromised attempt at a larger one.
Most toilet renovation Singapore projects that disappoint did not fail on budget. They failed because a constraint was discovered after the design was already agreed.
Tile hacking is loud and dusty, and in a bathroom it is concentrated into a very small space for a short period.
Tell the unit directly below as well. They are the ones with the most at stake if anything goes wrong with the waterproofing, and they will appreciate knowing.
Every number carries a named publisher and its publication date. Regulatory claims cite HDB directly with the date the page was read.
Rates observed in the market are observations with a date, never benchmarks. The kitchen renovation page applies the same wet-works logic to the other room that has it.
No licence number, no accreditation, no review, no rating and no photograph captioned as our own completed project. None exists for BTO Renovation SG.
Every bathroom image here is a generated illustration and says so. Check any firm, including us, against the register before you pay anything.
Tell us the flat type, when you collect keys, and whether the flat is new enough for the three-year restriction to apply. That answer shapes everything else.
You get a reply within one working day with a scope discussion and an indicative band, stated separately for an overlay and for a full hack so you can see the difference.
Checked against primary sources · updated 2026-09-01
