Pipe Leak Under Sink Water Damage Repair Cost in 2025
Quick Answer
Under-sink pipe leak repairs cost $500–$5,000 depending on how long the leak went unnoticed. Most repairs include plumbing fix ($150–$400), cabinet repair or replacement ($200–$2,000), and flooring repair if water spread.
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Cost Breakdown by Scenario
| Scenario | Typical Cost Range | What Changes the Price |
|---|---|---|
| Fresh leak, caught immediately | $500 – $1,000 | Dry-out and minor repairs |
| Leak for 1-2 weeks, cabinet damage | $1,000 – $2,500 | Cabinet repair or replacement |
| Long-term leak with mold | $2,500 – $5,000 | Mold remediation included |
| Cabinet replacement (stock) | $200 – $800 | Per cabinet, installed |
| Cabinet replacement (custom) | $800 – $2,000 | Custom match existing |
| Subfloor repair under cabinet | $300 – $800 | If water penetrated floor |
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Estimated Cost
This is an estimate only. Local labor rates and specific damage conditions will affect your actual cost. We recommend getting multiple professional assessments.
What Drives the Price
Understanding these key factors will help you estimate your costs more accurately and know what to expect when getting quotes.
1. Leak Duration
The longer a leak goes unnoticed, the more damage to cabinets and subfloor.
Example: A 2-week leak may rot cabinet bottom vs 2-day leak requiring only drying.
2. Cabinet Quality
Particle board cabinets fail quickly; solid wood can sometimes be saved.
Example: Particle board replacement: $400 vs solid wood repair: $200.
3. Flooring Spread
Water often spreads under adjacent flooring before being noticed.
Example: Kitchen island 10 ft away may have wet subfloor.
4. Mold Development
Dark, enclosed cabinet spaces grow mold quickly.
Example: Mold remediation adds $1,000–$3,000 to the project.
5. Matching Cabinets
Replacing one cabinet to match existing can be costly.
Example: Custom color match: $300–$500 extra.
Under-Sink Leaks Are Cheap Until the Cabinet Floor Gives Out
A slow leak from a supply line or P-trap under a sink is one of the least dramatic water events a home can have, and that's exactly why it's often the most expensive per gallon: nobody notices until the cabinet floor is already rotted through.
The plumbing fix is almost never the expensive part
Tightening a fitting, replacing a supply line, or resealing a P-trap connection is typically under $200 in parts and labor. What runs the bill up is what the slow drip did underneath: swollen particleboard cabinet bottoms, delaminated cabinet sides, and, if it went on long enough, a soft spot in the subfloor directly beneath the cabinet.
How far it spread depends on the cabinet's construction
Cabinets with a solid, sealed base tend to hold water like a shallow tray, containing the damage to that one cabinet even after months of slow leaking. Cabinets with any gap at the back for plumbing penetrations let water track straight down to the subfloor from day one, so a leak that looks identical from the outside can require very different scopes of repair depending on that construction detail.
Real-World Examples
Here's what actual homeowners paid in similar situations. Your costs may vary based on local rates and specific conditions.
Fresh Kitchen Leak
P-trap repair, cabinet drying, antimicrobial treatment
Caught within 24 hours, minimal damage
Bathroom Vanity Leak
Supply line replacement, vanity cabinet replacement, vinyl floor patch
Particle board vanity needed full replacement
Kitchen Leak with Mold
Mold remediation, base cabinet replacement, hardwood repair
Multi-week unnoticed leak with mold growth
Insurance Coverage
Often Covered
- Sudden pipe failure damage
- Resulting mold from covered leak
- Cabinet and flooring replacement
Commonly Denied
- Gradual deterioration
- Maintenance neglect
- The plumbing repair itself
Documentation Checklist
Document these items to strengthen your insurance claim:
- 1Photos of damage progression
- 2Plumber invoice
- 3Before/after cabinet condition
What to Expect: Timeline
Day 1
Emergency plumbing repair and water extraction
Day 2-3
Cabinet removal if needed, drying setup
Day 4-5
Mold inspection and treatment if required
Week 2
Cabinet and flooring replacement
Related Water Damage Guides
Essential guides in this topic cluster:
Frequently Asked Questions
Get a Better Estimate
Use our calculator and guides to understand typical costs before you start researching.