Replacing the floor panel inside a sink cabinet typically costs $150-$600, with an average near $350 for a straightforward repair. The price depends on cabinet size, water damage, panel material, labor minimums, and whether plumbing or the cabinet sides also need work.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| DIY panel replacement | $25 | $90 | $200 | Panel, sealant, fasteners, and basic supplies; excludes tools |
| Professional bottom-panel replacement | $150 | $350 | $600 | One cabinet, standard access, no plumbing relocation |
| Repair with damaged cabinet framing | $350 | $750 | $1,500 | May include reinforcement or partial cabinet rebuild |
| Full sink-base cabinet replacement | $500 | $1,200 | $2,500+ | Cabinet grade, countertop handling, and plumbing affect total |
What Does a Sink Cabinet Floor Replacement Usually Cost?
For a typical 30- to 36-inch-wide sink base, a contractor may charge $150-$600 to remove a damaged bottom panel and fit a new one. Many jobs land around $250-$450 when the cabinet sides and support rails remain solid and the sink and plumbing stay in place. A small repair may cost less, but service-call minimums can make a simple task more expensive than the material itself.
These estimates assume a single cabinet, ordinary access, and a replacement panel cut to fit. They generally include basic removal, installation, and sealing, but not mold remediation, plumbing changes, new cabinet doors, or countertop removal. Assumptions: typical U.S. labor rates, one sink-base cabinet, standard plywood, and no structural damage beyond the floor panel.
A one-panel repair is usually far less expensive than replacing the entire sink base, provided the cabinet sides and framing are still sound. A contractor may recommend a larger rebuild if the panel is swollen into the sidewalls, the cabinet has lost its shape, or moisture damage continues behind it.
How Plywood, Labor, and Disposal Shape the Quote
The quote usually combines a modest material bill with labor, setup, and cleanup. A cabinet bottom can be made from plywood, sealed plywood, or a moisture-resistant panel. The installer may also add cleats or support strips to hold the new piece, especially if the original panel was stapled or glued in place. Material selection matters, but labor access and the condition of the cabinet often matter more.
| Quote component | Typical range | What it covers | Price driver |
|---|---|---|---|
| Replacement panel | $20-$100 | Cut-to-size plywood or moisture-resistant sheet | Thickness, grade, and cut size |
| Cleats, sealant, and fasteners | $10-$50 | Support strips, adhesive, screws, and edge coating | Amount of reinforcement needed |
| Carpentry labor | $75-$125 per hour | Removal, fitting, fastening, and sealing | Access and damage complexity |
| Service call or minimum | $75-$200 | Travel, setup, and minimum billed time | Contractor policy and location |
| Removal and disposal | $0-$75 | Damaged panel disposal and job cleanup | Debris volume and local fees |
A basic panel job may require 2-4 labor hours, or about $150-$500 in billed labor before materials and any service minimum. Some contractors quote a flat price rather than listing hours. Ask whether the estimate includes panel removal, support cleats, sealing, cleanup, and a return visit if the cabinet must dry first.
Which Sink-Base Dimensions and Water Damage Raise the Price?
Cabinet width sets the panel size, but damage extent is often the larger cost variable. A standard 30-inch cabinet with damage limited to its bottom may fit within the basic range. A 36-inch or wider cabinet, a corner sink base, or a custom cabinet can require more cutting, added support, or a nonstandard panel. A larger panel alone may add only $20-$60 in material; difficult fitting can add much more in labor.
Water damage that reaches the vertical sides, back, or toe kick can turn a panel swap into cabinet rebuilding. If the bottom edges of both side panels are swollen or soft over more than 6-12 inches, a contractor may need to install reinforcement, replace sections, or rebuild the base. Those repairs commonly add $150-$700, depending on how much can be saved.
Material thickness and support also influence durability. A 1/2-inch panel may work where the cabinet has continuous support, while a 3/4-inch panel or added cleats may be needed for a broad span or a heavy storage load. Repairing the visible panel without finding the leak risks another failure. Get the moisture source fixed before closing the cabinet with a new floor.
Can the Cabinet Bottom Be Repaired Instead of Replaced?
Sometimes. If the panel is stained but remains firm, dry, and flat, cleaning, sealing, or adding a protective liner may cost $25-$150, including basic supplies or a short service visit. That is not a sound fix for plywood that crumbles, has delaminated, or remains swollen after drying. A liner can hide a leak and trap moisture rather than strengthen a failed panel.
A partial repair may be practical when damage is confined to a small area near a pipe opening. A carpenter can cut out the soft section, install a patch over cleats, and seal the edges. This may cost $150-$400, depending on access and whether the remaining panel can securely hold the patch. A full panel replacement is often more dependable when damage covers a broad area or the patch would sit under stored items.
Full cabinet replacement becomes more reasonable when the side panels, back, or face frame are also compromised, or when a replacement panel cannot be secured. A stock sink-base cabinet may cost $150-$700 before installation; installed replacement commonly reaches $500-$1,500 or more once labor, plumbing, and countertop handling are included. Compare the repair price with the full replacement quote only after confirming the cabinet’s structural condition.
How Long Does a Sink-Base Floor Repair Take?
A simple replacement generally takes 2-4 hours on site if the panel can be removed without dismantling the cabinet. Removing a glued or trapped panel may take longer, as can fitting a new piece around a drain, water lines, or a disposal. A basic repair may be completed in one visit; drying, leak repair, or replacement of swollen framing can extend the schedule by a day or more.
At typical handyman or carpenter rates of $75-$125 per hour, labor for a short repair might calculate to $150-$500. The final bill can be higher than the hourly calculation if a contractor has a minimum charge or needs a second trip. Some cabinet companies charge more than general handymen but may be better equipped for matching custom materials or rebuilding a complex cabinet base.
Access affects time. A packed cabinet must be emptied, and a large disposal unit or crowded plumbing can limit working room. In some cases, the sink, drain, or countertop must be disturbed to remove the panel; that can require a plumber or additional trade labor. Confirm in advance whether the quoted work includes disconnecting or reconnecting plumbing.
Which Extra Charges Appear When Plumbing Must Move?
A panel replacement usually does not require moving plumbing, but a fixed shelf, drain line, or disposal can make removal difficult. Disconnecting and reconnecting a simple drain or water supply may add about $100-$300 when handled by a plumber. Moving pipes, replacing a shutoff valve, or changing a drain configuration can add $200-$800 or more, depending on access and local rates.
Leak repairs are separate from cabinet carpentry. Replacing a supply line or trap may cost roughly $75-$250 for a straightforward repair, while a persistent leak behind a wall or below the sink can require diagnosis and more extensive work. Mold cleanup is also not automatically included in a cabinet quote; localized treatment may add $200-$700, while widespread contamination can cost substantially more.
Countertop or sink removal is uncommon for a simple bottom-panel job, but may be necessary if the cabinet is being replaced or its framing is failing. Handling can add $150-$500 or more, and stone countertops may need a specialist. Request separate line items for plumbing, leak correction, mold work, and countertop handling so the base-panel price remains comparable.
Three Sink-Cabinet Quotes at Different Damage Levels
These examples show how scope changes the total. They assume a moderate-cost U.S. market and standard access; local labor rates and contractor minimums can shift the numbers. The labor-hour figures are approximate billed time, not a guarantee that work will be completed in one uninterrupted visit.
| Job scope | Materials and disposal | Labor assumption | Estimated total |
|---|---|---|---|
| Replace a 30-inch panel, sound cabinet | $45-$110 | 2-3 hours at $85-$110 per hour | $250-$450 |
| Replace a 36-inch panel and add cleats | $70-$160 | 3-5 hours at $90-$120 per hour | $400-$750 |
| Rebuild base with damaged side edges | $150-$350 | 6-10 hours at $90-$125 per hour | $800-$1,600 |
The first quote assumes the existing cabinet can accept a new panel without removing plumbing. The second includes additional support and more fitting time. The third represents substantial carpentry, not a routine panel swap; it may be worth comparing against the price of a stock cabinet replacement.
A quote that is much lower may exclude leak correction, sealing, or disposal. A higher quote may include plumbing work, custom fabrication, or a warranty. Compare the written scope and the cabinet condition, not just the headline total.
How to Cut the Cost Without Hiding Moisture Damage
First, stop the leak and dry the cabinet before scheduling the panel work. If the source is a loose trap or supply connection, repairing it promptly can prevent damage from spreading into the cabinet sides or floor below. Emptying the cabinet and removing stored items also saves the contractor time, but homeowners should not cut into a panel containing hidden plumbing or wiring.
Keep the work limited to the damaged area when the frame is sound. A standard plywood panel with sealed edges may be adequate; a premium waterproof sheet is not always necessary if the cabinet is kept dry and the leak is corrected. Ask whether reinforcement is actually needed rather than automatically approving a full cabinet rebuild. Conversely, do not choose a thin patch simply to reduce the quote if the remaining bottom is soft.
Request two or three itemized estimates from carpenters, handymen, or cabinet repair services. Confirm panel thickness, material, labor, support work, disposal, and warranty terms. Scheduling several small repairs together may help offset a service minimum, while emergency or after-hours visits can add roughly 20%-50% to labor charges. The best savings usually come from controlling the repair scope early, not postponing necessary moisture repairs.