Hardwood and water can coexist for decades, right up until a dishwasher hose splits or the washing machine overflows. The first instinct is to rip up the swollen boards, which is usually the wrong move. Water damaged timber floor repair works best in a set order: stop the water, let the floor dry, measure what is happening in the timber and the subfloor, and only then decide which boards stay and which go.
Design Timber Flooring is a mobile service across Sydney, owner-operated by Jimmy, who has been working on Sydney timber floors since 2006. He comes to the property, assesses the damage himself and gives a fixed-price written quote once the scope is clear. This page goes deeper on water damage; for the broader picture, see our full timber floor repairs service.
Where the water usually comes from
Most water damage is slow and quiet. A small leak under a sink can wet the same boards for months before anyone notices a dark edge or a lifted joint.
| Source | What it often looks like | Where to look first |
|---|---|---|
| Dishwasher or fridge water line | Darkening or cupping in front of the appliance, boards lifting at the kickboard | Hose connections and the fridge water line |
| Kitchen or bathroom plumbing | Staining spreading out from a wall or cabinet base | Under-sink traps, wall cavities, shower recesses |
| Laundry overflow or leaking tap | Swelling along the laundry doorway | Machine hoses, tub seals |
| Pet accidents | Dark, almost black rings that grow over time | Corners, beside doors, under rugs |
| Wet entries and open doors | Greying or raised grain near the threshold | Door seals, paving falls |
| Flooding or a burst pipe | Widespread swelling, boards pushing against walls | Subfloor framing, skirting, wall linings |
Pet urine soaks into the grain, so the black staining often goes deeper than sanding can reach. Those boards are frequently better replaced, but we check first.
Fix the source first
No flooring repair should go ahead while water is still getting in. A plumber needs to find and fix the leak, and water sitting under the house, from poor drainage or a broken downpipe, needs dealing with too. If you have just found a leak:
- Turn off the water to the appliance or the house if you can do so safely.
- Mop up surface water and pull back wet rugs and mats so the boards can breathe.
- Run fans and open windows if the weather allows. Avoid aiming heaters at the boards, as forced drying can crack or split timber.
- Take dated photographs before anything is moved or thrown away.
Drying and moisture readings
Swollen hardwood often settles noticeably once it dries; other boards stay cupped, cracked or stained. The only honest way to tell is to wait and measure.
Jimmy checks moisture in the affected boards and compares it with dry boards elsewhere in the same floor. Where there is subfloor access, he also looks underneath, because a floor over a damp crawl space will not dry properly from the top alone. Drying time varies with the amount of water, the season, ventilation and whether the subfloor got wet, so we do not put a fixed number of days on it. Sanding or replacing boards before they have stabilised risks the floor moving again afterwards.
What Jimmy checks on site
When Jimmy visits, he works through the whole picture, not just the stained patch:
- Whether the water source has been fixed and confirmed by the relevant trade.
- Moisture levels in damaged boards compared with unaffected areas of the floor.
- How far the damage runs, including under kickboards, cabinets and skirting.
- The condition of joists, bearers or battens wherever they can be seen.
- Board species, width, thickness and profile, for sourcing replacements.
- How much sandable timber remains above the tongue.
- Signs of mould, rot or pest activity that need another trade first.
Repair or replace?
Not every water-marked board has to come out. As a general guide:
Boards may be saved when they have dried back close to the rest of the floor, any cupping has largely settled, the timber is structurally sound and the staining is shallow enough to come out with sanding.
Boards usually need replacing when they are split, soft or delaminating at the tongue, deep staining remains after drying (common with pet damage), the boards have permanently cupped or crowned, or the tongue and groove has broken down so they no longer sit flat.
Where a section needs replacing, damaged boards are cut back to sound timber and matched boards laced in. Our guide to floorboard replacement and matching explains that process. If the boards have dried with a lasting cup or with gaps along their edges, the page on cupping and gaps in floorboards covers why timing matters before sanding.
Insurance: document everything
If you are claiming on home insurance, contact your insurer early. Policies differ, so we cannot tell you what is covered, but these records usually help:
- Dated photographs of the damage, the source of the leak and any affected joinery.
- The plumber's invoice or report showing what failed and when it was fixed.
- Notes on when you discovered the leak and what you did straight away.
- Leftover flooring, product information or original receipts if you have them.
Jimmy's fixed-price written quote sets out the recommended scope, which you can share with your insurer.
Mould and structural damage need the right trade
Rotted subfloor framing, mould on joists or wall linings, or signs of termites need a builder, a mould remediation specialist or a pest inspector before any flooring work. We will tell you if we see them, and we will not lay new boards over an active problem.
Engineered, laminate and hybrid floors
This repair service covers solid hardwood floors. Engineered, laminate and hybrid planks react to water differently, and many cannot be repaired board by board unless matching planks are available and the locking system allows it. If your floor is one of these, have the product name ready and talk to Jimmy, or read about engineered timber flooring and hybrid and laminate options if replacement makes more sense.
Finishing the repair
Once new boards are in, or saved boards have settled, the area usually needs sanding and coating so old and new timber sit flush and take the same finish, often across the whole room. Our floor sanding and polishing service covers that step, with vacuum-assisted machines that reduce dust at the source. Some colour difference between new and older boards is normal at first and usually softens as the timber ages.
Water damage repairs across Sydney
Jimmy travels to homes across Greater Sydney. Kitchens and laundries in older homes are common trouble spots, especially original hardwood in Inner West terraces and cottages and in semis through the Eastern Suburbs, where plumbing has often been altered more than once.
After the repair, our timber floor care guide has practical tips for keeping water away from the boards, from appliance checks to entry mats.
Frequently asked questions
Will water-damaged floorboards go back to normal on their own?
Some do. Hardwood that swelled after a short leak can settle noticeably once it dries, while boards that stayed wet for a long time, or were soaked with pet urine, often remain cupped, cracked or stained. The best approach is to fix the source, let the floor dry and have the moisture checked before deciding.
How long should I wait before repairing a water-damaged timber floor?
It depends on how much water got in, whether the subfloor was wet, ventilation and the season. Rather than picking a number of days, we compare moisture in affected boards with dry areas of the same floor and proceed once they have stabilised.
Can you sand out water stains?
Light grey surface marks can often be sanded out. Dark or black staining, particularly from pet urine or long-term leaks, usually goes deeper into the timber and may not sand out. In those cases, replacing the affected boards is often the better result.
Should I pull up the wet boards straight away?
Usually not. Removing boards before they have dried can mean replacing timber that would have settled. Stop the water, dry the area and take photographs. The exception is where a trade needs access to fix a leak or where there is a safety concern.
Do you work with insurance claims?
We provide a fixed-price written quote setting out the recommended scope, which you can share with your insurer. Your insurer or their assessor decides what is covered, so contact them early and keep photographs and the plumber's report.
Can you repair water damage on an engineered or hybrid floor?
Our repair service is for solid hardwood. Engineered, laminate and hybrid repairs depend on the product and whether matching planks are available. Tell Jimmy the product name and he can talk through the options.
Send us photos of the water damage
Have a leak, a stain or boards lifting near the dishwasher? Send a few photos of the damage and the surrounding floor, plus your suburb, through our free quote request form, or call Jimmy on 0404 906 432 to arrange an on-site assessment.