Changing a single vanity to a double vanity typically costs $1,500-$5,500, with an average near $3,300 for a standard bathroom and midrange materials. The final price depends most on vanity width, plumbing changes, countertop and sink choices, and whether the existing bathroom needs electrical or wall repairs.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Complete conversion | $1,500 | $3,300 | $5,500 | Vanity, two sinks, installation, and typical plumbing work |
| Vanity cabinet and top | $600 | $1,700 | $3,500 | Usually 60-72 inches wide |
| Plumbing changes | $300 | $900 | $2,000 | Higher if drains or supply lines need rerouting |
| Labor | $500 | $1,200 | $2,500 | Removal, fitting, plumbing, and finish work |
Typical price for a 60- to 72-inch double vanity
Most standard conversions land between $2,500 and $4,500 when the new vanity fits the existing wall and plumbing needs only modest changes. A basic stock cabinet, laminate or cultured-marble top, and two drop-in sinks can keep the project near the low end. Custom cabinetry, stone counters, wall repairs, or relocated plumbing push the total higher.
For a straightforward job, expect roughly $25-$75 per inch of vanity width for the cabinet and top together, though product quality and countertop material make this a rough comparison rather than a fixed rate. Assumptions: U.S. midmarket labor, standard 60- to 72-inch vanity, normal access, and no major water damage.
Cabinet, countertop, and plumbing charges in one quote
Quotes often combine several trades. Confirm whether the price includes disposal, faucets, drain assemblies, countertop cutouts, and reconnecting both sinks; an apparently low installation quote may exclude these items.
| Quote component | Low | Typical | High | Price basis |
|---|---|---|---|---|
| Vanity cabinet and top | $600 | $1,700 | $3,500 | $10-$50 per inch of width |
| Two sinks and faucets | $250 | $650 | $1,400 | $125-$700 per sink and faucet set |
| Plumbing labor and parts | $300 | $900 | $2,000 | $75-$150 per hour, often 3-10 hours |
| Removal and installation | $350 | $850 | $1,600 | Cabinet removal, leveling, fastening |
| Finishing and disposal | $100 | $350 | $900 | Haul-away, patching, paint, trim |
Labor allowances vary by market and by whether a plumber, carpenter, and countertop installer charge separately.
How vanity width and drain spacing change the estimate
Width and plumbing layout are the strongest price drivers: a 60-inch stock unit can be far less costly than a 72-inch custom cabinet with a relocated drain. A double vanity generally needs enough counter space for two basins and usable space between them; measure wall length, door swing, and clearance before selecting a model.
If the existing drain is centered, a plumber may need to add a second drain branch and adjust hot and cold supply lines. Keeping the new basins near existing plumbing may cost $300-$700 for basic modifications. Moving a drain more than 3-4 feet, opening a finished wall, or changing a vent connection can bring plumbing work to $1,000-$2,000 or more.
Countertop material also matters. Laminate or cultured marble may add about $200-$700 beyond the cabinet, while quartz or natural stone can add $700-$2,000, including fabrication and sink openings. Custom widths, unusual wall angles, and nonstandard sink placements typically require more labor.
Do two sinks require moving the drain or water lines?
Not always. Some bathrooms have plumbing positioned to serve two basins, or the new cabinet can be selected to work with existing connections. A plumber should verify drain locations, venting, shutoff valves, and cabinet access before the vanity is ordered.
When pipe changes are needed, the work may be straightforward if the plumbing remains accessible beneath the cabinet. Opening drywall or tile to reroute lines adds patching and finish costs. If the conversion involves moving a wall, altering a shared plumbing stack, or changing electrical outlets, request separate itemized prices rather than treating those tasks as standard vanity installation.
How many work hours does a double-vanity conversion take?
A simple replacement can take one to two days, often split between removal and installation, plumbing connections, and countertop or sink work. A more involved conversion may take two to four days of scheduled work, even if the combined labor time is shorter, because separate trades and countertop fabrication must be coordinated.
Carpenter or installer rates commonly run $50-$100 per hour, while plumbers often charge $75-$150 per hour. A typical project may use 8-18 combined labor hours. Ask whether the bid includes reconnecting both faucets and testing for leaks, not just setting the cabinet in place.
Removal, wall repairs, and other add-ons to budget
Removing and hauling away the old vanity commonly adds $100-$400. Drywall repair and repainting may add $150-$600, while tile or flooring repairs can cost $300-$1,500 depending on how much of the old vanity footprint was exposed. These are common surprises when the replacement is narrower or has a different toe-kick.
Faucets, mirrors, lighting, and medicine cabinets are often priced separately. Two new faucets may cost $150-$800 for the pair, excluding installation. Replacing a single wide mirror with two mirrors or adding lighting may add $200-$1,000. Ask contractors to identify allowances and exclusions so add-ons do not blur the base estimate.
Why local labor can shift bathroom vanity pricing
Labor prices in large coastal metros can run about 15%-35% above national midmarket estimates; smaller cities and rural areas may come in 5%-20% lower. The difference reflects local wages, contractor demand, travel, and disposal charges rather than a different standard for the vanity itself.
Older homes can also cost more when pipes are corroded, walls are out of square, or prior work does not meet current code. Permit requirements vary by city and usually depend on whether plumbing is relocated or the project changes more than the fixture. Check with the local building department before assuming a permit is unnecessary.
Ways to control the cost without cutting useful scope
Keeping plumbing close to its current location and choosing a stock cabinet are the most reliable ways to reduce the total. Measure carefully, compare units with compatible drain openings, and settle the cabinet width before ordering a countertop. A small design change can avoid custom fabrication or extra pipe work.
Get at least three itemized estimates that separate cabinet, top, plumbing, installation, disposal, and finish repairs. Compare the same materials and scope, not just the bottom-line totals. If the existing cabinet is sound and wide enough, ask whether adding a second basin and replacing the top is feasible; it may cost less, but cabinet support, sink spacing, and plumbing access must be checked first.
Choose standard sink and faucet sizes, retain serviceable mirrors and lighting, and handle simple room clearing yourself if the contractor agrees. Avoid buying a vanity before confirming wall dimensions, plumbing positions, and delivery access; restocking or modification charges can erase savings.