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Under-sink water-stain repair costs in 2026
As of August 2026, budget about $250–$1,000 for professional correction of a typical under-sink water stain when the job includes repairing an accessible leak and replacing or repairing the damaged cabinet bottom. The biggest variables are the moisture source, whether the cabinet remains structurally sound, and whether damage extends behind the cabinet or into the floor.
That range is a planning calculation, not a single published national average. It combines HomeGuide’s $100–$500 range for an easy-to-reach interior pipe leak, including exposed plumbing under a sink, with HomeAdvisor’s $150–$500 range for replacing a water-damaged kitchen-cabinet bottom.
“Fixing the stain” can mean three different tasks: stop the water source, dry and clean the area, and restore damaged material. A dry, firm cabinet with a historic mark may not need every step. Swollen, soft, delaminated, or still-damp material usually changes the scope.
Low, typical, and high scenarios
| Scenario | 2026 planning amount | Likely scope |
|---|---|---|
| Low | $150–$500 | Leak already corrected; localized cabinet-bottom repair or replacement only |
| Typical | $250–$1,000 | Accessible supply, drain, or fitting repair plus cabinet-bottom work |
| High | $1,000+ | Concealed leak, full cabinet work, adjacent flooring or wall damage, or specialized cleanup |
These tiers are not standardized quotes. A service minimum can make a tiny plumbing adjustment relatively expensive, while one contractor may combine tasks that another separates.
What a useful estimate includes
The estimate should say whether the price covers diagnosis, the plumbing repair, drying, cabinet work, disposal, and finish matching. It should also identify exclusions, especially wall opening, flooring, full cabinet replacement, and mold assessment or cleanup.
Ask whether the diagnostic or service-call charge applies to the repair. HomeGuide reports diagnostic or minimum call-out fees of $50–$200 for pipe leaks. If separate trades are needed, each may have its own minimum charge.
Do not price the color alone
A visible mark does not reveal whether moisture is active or how far it traveled. Confirm the source and material condition before comparing cosmetic-repair prices.
What moves the price most
Access is usually decisive. Exposed supply lines, shutoff valves, traps, and drain joints are easier to evaluate than plumbing behind a cabinet or wall. The leaking component, pipe material, replacement parts, and after-hours scheduling also affect labor.
Cabinet construction matters just as much. A removable bottom panel can be a contained repair; damage to the cabinet sides, back, face frame, countertop support, or neighboring floor may require carpentry and finish work. Matching an existing finish can add time even when the wet area is small.
Location changes the labor portion. Angi’s July 2026 city examples for leaky-pipe repair range from $150–$375 in Orlando to $275–$750 in Seattle, illustrating why a national allowance cannot predict a local bid.
When to obtain specialist estimates
Get itemized plumbing and cabinet estimates when the area remains damp, the leak cannot be reproduced, material feels soft or swollen, or the damage crosses into a wall or floor. Compare the same scope and ask how concealed damage will be priced if discovered.
Prompt drying can also limit the repair boundary. The EPA recommends fixing the water problem and drying water-damaged areas and items within 24–48 hours to prevent mold growth. If visible growth, persistent odor, or extensive wet material complicates the work, qualified evaluation can define the cleanup scope before finishes are replaced.
