Adding a second bathroom sink typically costs $1,200-$4,500, with an average near $2,700 for a standard vanity and straightforward plumbing. The final price depends on whether existing drain and water lines can be extended, whether the vanity or countertop needs replacement, and local labor rates.
| Item | Low | Average | High | Notes |
|---|---|---|---|---|
| Installed second sink | $1,200 | $2,700 | $4,500 | Typical addition near existing plumbing |
| Sink and faucet | $150 | $450 | $1,200 | Bowl, faucet, and basic fittings |
| Plumbing labor | $400 | $1,000 | $2,200 | Higher if pipes are concealed or distant |
| Countertop or vanity work | $200 | $850 | $2,500 | May include a new double-sink top |
What a second bathroom sink costs with standard plumbing
A straightforward installation generally runs $1,200-$2,800 when the current vanity has room, water lines are accessible, and the drain can be connected nearby. A sink, faucet, trap, supply lines, countertop cutout, and plumber labor are typically included. A more involved project with a new vanity, replacement countertop, or wall repairs can reach $3,000-$4,500.
For budgeting, allow about $2,700 for a standard addition and verify what the quote includes. Prices assume a conventional residential bathroom, midrange fixtures, and no major rerouting. An added sink may be priced around $600-$1,500 per fixture for plumbing and installation alone, before substantial vanity or countertop work. Assumptions: U.S. midrange labor rates, standard materials, and normal access.
How plumbing, fixtures, and vanity work shape the quote
The total combines fixture purchases with plumbing, installation, and any alterations to the vanity. Costs vary because an existing single-sink cabinet may not have enough width or a suitable countertop for a second basin.
| Quote component | Low | Typical | High | What changes the charge |
|---|---|---|---|---|
| Sink, faucet, and drain parts | $150 | $450 | $1,200 | Material, style, and faucet features |
| Plumbing labor | $400 | $1,000 | $2,200 | Pipe access and drain changes |
| Countertop cutout or replacement | $200 | $850 | $2,500 | Cutting versus installing a new top |
| Vanity, finish repair, and disposal | $100 | $500 | $1,500 | Cabinet modification or replacement |
Plumbing access and countertop work are often the largest sources of price variation. Plumbers commonly charge $75-$150 per hour, with a minimum service charge of roughly $150-$300. Ask whether the estimate includes shutoff valves, a compatible drain connection, leak testing, and cleanup.
Does the vanity width or drain distance raise installation costs?
Yes. A double-sink setup usually needs a vanity approximately 60 inches wide; a 48-inch cabinet may be tight, depending on basin size and spacing. If the existing cabinet is too narrow, replacing it and its countertop can add $700-$2,500 or more, excluding premium materials.
Plumbing is usually least expensive when the new basin sits close to existing lines. Extending water supplies a few feet may add roughly $200-$600, while opening a wall or floor and moving a drain 5 feet or more can add $500-$1,500. Concrete floors, tile, and limited access can increase repair labor.
Measure the cabinet and locate the drain before treating a low fixture price as the project budget. A second faucet also needs suitable hot and cold supply connections, while two sink drains must be configured to meet local plumbing requirements.
When does a double vanity cost less than adding one sink?
Keeping a functional single vanity and fitting a second basin can cost less than replacing the entire cabinet, but only if the top has enough width and can accept another cutout. A countertop replacement with a second basin may cost $1,500-$3,500 installed, depending on material and plumbing access.
A complete double-vanity replacement often runs $2,500-$6,000, including a new cabinet, top, two sinks, faucets, and installation. It may be the more practical option when the existing vanity is undersized, damaged, or poorly configured. Stone tops and custom cabinetry can push the total higher.
Compare the cost of modifying the current vanity with a complete replacement, not just the price of a second bowl. Reusing a sound cabinet avoids demolition and disposal, but forcing two sinks into insufficient counter space can compromise usability.
How many hours does the bathroom sink installation take?
A plumber may need 4-8 hours for an accessible installation with nearby water and drain lines. A coordinated project involving countertop fabrication, cabinet changes, or finish repairs can take 1-3 days, often with separate visits. Custom countertops may require additional lead time before installation.
Plumbing work commonly accounts for $400-$1,200 in a simple job; complicated access or pipe relocation can push labor above $2,000. If the countertop must be removed, allow for the fabricator’s measurement and installation schedule as well as the plumber’s return visit.
Request labor hours and trade responsibilities in writing to identify double charges or missing work. Confirm who disconnects the old sink, cuts or replaces the top, installs the faucet, reconnects plumbing, and repairs disturbed surfaces.
Which bathroom sink upgrades add expense beyond the fixture?
Premium faucets, vessel sinks, stone countertops, new cabinetry, and wall or floor repairs can expand the estimate. Fixture and faucet choices together may range from $150 for basic products to $1,200 or more for higher-end models. A new countertop can add $500-$2,500, depending on material, size, and fabrication.
Permit requirements differ by city and by the scope of plumbing changes. A like-for-like fixture installation may not require a permit, while relocating drains or changing concealed plumbing may. If needed, budget roughly $50-$300 for a basic permit, plus inspection or contractor charges where applicable.
Ask the contractor to separate required plumbing work from optional finish upgrades. A written estimate should also say whether permit fees, disposal, patching, and taxes are included or billed separately.
How do bathroom sink quotes differ by U.S. region?
Labor rates and contractor availability can make the same scope cost more in major coastal metros than in smaller inland markets. A practical planning range is 10%-25% above national midrange pricing in high-cost urban areas; rural markets may run 5%-15% below it, although travel charges can offset savings.
For a $2,700 typical project, those differences suggest about $2,970-$3,375 in a higher-cost market or $2,295-$2,565 in a lower-cost area. These are budgeting adjustments, not fixed regional tariffs. Material availability, local code, and the amount of plumbing work can matter more than geography alone.
Compare at least three itemized local quotes for the same sink, countertop, and pipe-routing scope. Check that each estimate includes labor, fixtures, finish repairs, disposal, and any permit before comparing totals.
Which choices keep a second-sink project near budget?
Keep the new basin close to the existing plumbing, reuse a sound vanity, and select a standard sink and faucet rather than custom fixtures. Ask whether a countertop installer can cut a compatible top instead of replacing it, and handle simple room clearing or cabinet preparation only when the contractor approves.
Schedule the work with other planned bathroom updates when trades can share a visit, but avoid adding unrelated renovations to a quote without comparing their separate prices. Do not skip required permits or code-compliant drainage to reduce the upfront bill; correcting improper plumbing can cost more later.
The most dependable savings come from limiting pipe relocation and avoiding unnecessary cabinet and countertop replacement. Have each bidder price the base installation separately from optional upgrades, then compare the same scope and warranty terms.