Double Vanity Upgrade
Handis double vanity upgrade is the single-sink-to-double-sink master-bath expansion that ends the morning sink-share for two people in the same household — from $2,500 for a 60-inch double on existing drywall plus the licensed plumber's separate invoice on the second-sink rough-in, to $6,000 for a 72-inch fully custom shaker double with templated quartz and dual sconces. The single-sink master vanity where two adults brush their teeth at the same sink every morning, where the kids fight over who gets the mirror, where every routine is a queue. The fix is one wider cabinet, two sinks, two mirrors, two sconces — and the licensed Washington L&I plumber's half-day to rough in the second drain and the second hot-and-cold supply. Handis runs the carpentry, the cabinet set, the scribe on both wall ends, the templated countertop with two sink cutouts, and the dual-mirror finish. The plumber's scope is named line by line on the quote.
Service
How a Double Vanity Upgrade Works
Six sequential steps from booking-call layout planning through final dual-mirror walkthrough — the actual sequence we follow on every single-to-double vanity expansion.
Plan the Second-Sink Location with the Plumber
We confirm the existing vanity width, the new double cabinet width (60, 66, or 72 inches), and the second-sink location relative to the first. The licensed plumber reviews the in-wall framing, the existing supply and drain rough, and the route for the second drain stub. The plumber's full day is scheduled on the calendar for day two of the project.
Demo the Existing Vanity, Prep the Wall for the Rough-In
Water shut off at the bathroom isolation valve or at the building main. Existing single-sink vanity, top, and sink lifted out as one assembly where possible. Drywall opened where the plumber needs access to add the second drain stub and the second hot-and-cold supply. Debris on a drop cloth, out to the hallway, out of the house.
Licensed Plumber Day — Second-Sink Rough-In
The licensed Washington L&I plumber adds the new drain stub at the correct height and offset for the second sink, the new hot-and-cold supply lines with shut-off valves at the wall, and pressure-tests every connection. Plumber leaves the rough capped and pressure-tested. Drywall patched and primed before the cabinet returns to the wall.
Dry-Fit and Scribe the Double Cabinet to Both Walls
Dry-set the new 60, 66, or 72-inch double cabinet. Scribe both end panels to the actual walls (a compass-scribe transfer and a belt sander on each end) — bathroom corners are rarely 90 degrees on either end. Shim the toe-kick to level along the entire long run, plumb the cabinet face with a 4-foot level, secure to the wall with stud anchors or rated toggles every 16 inches.
Template the Top, Fab Lead Time, Return for Install
Templater visits the day after cabinet set to template the templated quartz or stone top with two sink cutouts measured to the cabinet as it actually sits. Fab time is 1 to 2 weeks. We return for the top install and final plumbing connections on day 12 to 16.
Install Sinks, Faucets, Mirrors, Leak-Check, Walkthrough
Top set on the cabinet. Both sinks set (undermount epoxied and clamped from below, drop-in laid in on silicone). Both faucets set on the deck. Plumber returns for final supply hookups and trap connections on both sinks; water back on, every connection leak-checked at the supply stop and under the cabinet. Two mirrors hung centered over each sink with a level cross-reference. Two sconces centered above the mirrors. Final re-caulk in 100 percent silicone. Walkthrough with the homeowner.
Double Vanity Upgrade Pricing
Final pricing is Handis labor plus countertop material plus the licensed plumber's separate invoice on the second-sink rough-in. Templated stone tops add fab lead time. Sconce install adds licensed electrician if a new circuit is needed. Request a free estimate for an accurate quote.
Tell us the master-bath wall length and the double-vanity width you want — we will quote Handis carpentry, the plumber rough-in, and the dual-mirror finish.
Why Handis for Double Vanity Upgrade
A double vanity upgrade is the biggest single-project storage update we run on this hub because it is the only one that adds an entire sink — a second supply line, a second drain stub, a second trap, a second faucet — to a bathroom that has gotten by with one for decades. The carpentry is straightforward; the plumbing is the real scope change. We have done enough double-vanity upgrades to know exactly how the in-wall framing reads, what the plumber's hours look like on a typical second-sink rough, where the drain offsets have to land for a symmetric layout, and how to schedule the templated top so the project does not stall waiting on quartz fab. The end result is a master bath that two adults share at 7 a.m. instead of negotiate over.
Estimate
Tell us the existing single-sink vanity width, the master-bath wall length where the double vanity will go, the double-cabinet width you want (60, 66, or 72 inches), the countertop choice (stock or templated quartz/stone), and any known constraints — an out-of-square corner, tile flooring you want to preserve, a previously moved supply line. We send a clear estimate with the licensed-plumber rough-in scope called out separately.
Customer Reviews
Double vanity upgrade reviews from real Handis customers.
Master bath in our 1998 Issaquah house — single-sink vanity for 25 years, finally upgraded to a 66-inch double. The plumber came in for a full day on the second drain and the second supply (drywall opened, framed-in, capped, pressure-tested). Handis set the templated quartz top with two undermount sinks. Three weeks end-to-end including the top fab lead time. No more morning sink-share.
72-inch custom shaker-front double in our Mercer Island master. The bathroom wall is about 80 inches long and one corner is out of square by maybe 4 degrees. They scribed both end panels and you cannot see a single shim. Two sinks, two mirrors leveled to the same cross-reference line, two sconces centered. Looks like a magazine photo every morning.
60-inch stock double with a stock standalone marble top in our 1962 split-level master. No fab lead time on the top because it was an in-stock size. Handis set the cabinet day one, plumber rough day two, top and final plumbing day three. Three working days total, came in at the low end of the quote. Mirror placement is dead-centered over both sinks.
The plumber sub on our 72-inch double had to route the second drain around an existing duct in the wall cavity. He showed us the route before he opened drywall — added two hours to his day, no surprise on the bill. Handis kept the cabinet set on schedule and the templater landed on day two as planned. Communication was the best part of the project.
Coordinated upgrade — 66-inch double vanity at the same time as new bathroom tile floor in our Wallingford guest bath. Handis handled the carpentry and the carpentry coordination with the tile setter; the plumber handled the rough; everything finished in eight working days. Two sinks where there was one, brand-new tile under it, all on one project.
Frequently Asked Questions
Common questions about single-sink to double-sink bathroom vanity upgrades.