We handle double vanity installation across 77006 in Houston, roughly 15 miles from our Energy Corridor base.
Going from a single vanity to a double is the most requested change in Houston master bathrooms, and it is also the one where the plumbing under the slab decides how big the job is. Two sinks means two drains and four supply stops. If the existing rough-in happens to land inside the new cabinet’s plumbing zones, the work stays in the wall. If it does not, someone is either building a chase, relocating drains inside the wall cavity, or in the worst case opening the slab. That single question separates a two-day install from a project with a jackhammer and a concrete truck, and it deserves an answer before anyone picks a countertop.
What the work involves
We start by measuring the wall honestly, corner to corner, at floor height and at counter height, because they are rarely the same number. Then we locate the existing drain and supplies and lay the proposed cabinet over them on paper. Standard vanity cabinets have solid ends and drawer boxes that do not tolerate a drain landing anywhere it wants.
Demo follows: old vanity and top out, old top and backsplash removed, plumbing capped, and the wall inspected. Very often the drywall behind an old vanity is damaged or stained, and that gets cut out and replaced rather than covered.
Plumbing is next. Where the drain has to move a modest distance, it usually can be done in the wall by rerouting the trap arm and re-tying above the slab. Supplies get new stops and, where the existing ones are old multi-turn valves, quarter-turn replacements.
Then the cabinet. Vanities get shimmed level and plumb, scribed to the wall, and fastened to framing. Level matters here more than people expect, because an undermount sink and a stone top will show any twist. Countertop templating happens after the cabinet is set. Faucets, drains, and traps are assembled, then the backsplash, then caulk, then the mirrors and lighting that usually come with the change.
What goes wrong, and how it is avoided
The common error is re-topping a cabinet that is not level or is quietly failing. Stone set on a racked or soft base bears unevenly, and cracks appear at the sink cutouts months later, which people then blame on the material. Second is reusing corroded angle stops because they happen to be closed at the moment. They seize, they weep, and replacing them later means opening finished work. Third is keeping an old faucet on a new top, where a worn cartridge and scaled aerator undercut everything you just paid for, and the holes may not match the new drilling anyway. Fourth is assuming the old top lifts off cleanly. Stone and tile decks are usually adhered and come out in pieces, taking backsplash and sometimes drywall with them, so plan wall repair into the scope. Finally, changing to a taller cabinet without checking the existing drain stub height leaves the trap arm in the wrong place, and on a slab that is not a trivial correction.
What drives the cost
Whether the drains move, and how far, is the biggest single factor. Staying in the wall keeps the job in normal territory. Opening a slab changes the category entirely and brings scanning, cutting, plumbing, concrete, and floor repair with it.
Cabinet construction and origin are next. A stock vanity from a box store, a semi-custom order, and a locally built plywood cabinet scribed to your wall represent three very different numbers, and the middle one covers most projects.
Countertop material spreads widely. Cultured marble, quartz, and natural stone each carry different fabrication and edge costs, and an undermount sink installation costs more than a drop-in.
Wall length matters less than you would think; what matters is whether a stock width fits or the space demands a custom size, and whether there is a corner, a window, or a soffit to work around.
Finally, the work that comes along for the ride. New mirrors, lighting, an outlet added to the vanity area, a repainted wall, and new flooring under the footprint are all common and all real line items.
Materials and specification
Some material choices shorten the disruption noticeably. A wall-hung or floating vanity, where the layout allows it, keeps drains in the wall and avoids slab work entirely, and it keeps the cabinet box off a floor that might get wet. Cabinet boxes should be plywood rather than particleboard, because in this climate a slow supply drip turns particleboard into a swollen, unrecoverable mess while plywood dries out. Countertop material drives the schedule: engineered quartz and granite both need templating and off-site fabrication, and their lead time is whatever the fabricator’s queue is, which nobody should promise you in advance. Marble looks superb and etches from ordinary bathroom products, so it is a choice about tolerance rather than quality. Faucets are worth specifying for hard water: solid brass bodies with ceramic disc cartridges, and physical vapour deposition finishes such as brushed nickel or PVD brass, resist scale marking far better than polished chrome. Aerators will still need periodic soaking regardless.
Building for Gulf Coast conditions
Three Gulf Coast realities shape a vanity install. First, cabinet construction. A bathroom here holds humid air most of the year, and a particleboard cabinet box with a laminated face will swell at the sink base the first time a supply connection weeps. Plywood boxes with a proper finish cost more and are the right specification in this climate, particularly for the sink base and the toe kick.
Second, the slab. Houston homes sit on slab-on-grade over expansive clay, and floors are often out of level by a noticeable amount across an eight-foot vanity run. The cabinet gets shimmed and the base scribed rather than set on the floor and hoped for. Newer homes, roughly from the 1980s onward here, are frequently on post-tension slabs, and no one cuts or drills that slab without locating the tendons first. That is why we look hard for a way to solve drain relocation inside the wall.
Third, hard water. Houston water leaves scale, and that punishes some finishes more than others. Living finishes and certain matte coatings show spotting quickly on a vanity that gets used twice a day. Chrome and quality brushed nickel wipe clean. It is worth knowing before you fall in love with a faucet.
What we see in Houston
Houston is not one housing stock, so it is not one kind of remodel. In the Heights and Woodland Heights you are often working on 1910s–1930s wood-frame homes on pier-and-beam, where leveling, sill and joist repair, and original wiring long past its service life come before anything cosmetic — and where a home in a designated historic district brings design review with it. Montrose, Oak Forest and Garden Oaks add mid-century layers. Meyerland, Westbury, Braeswood and Sharpstown are largely 1950s–60s slab ranch: cast iron drains near the end of their life, galvanized supply, single-pane windows, popcorn ceilings that should be tested before they are disturbed. Memorial and Alief lean 1970s–80s, which brings aluminum branch wiring and polybutylene supply into the conversation. West of Beltway 8 you are usually in 2000s and 2010s construction, where the job is upgrade rather than repair. Houston has no zoning, but plumbing, electrical and structural work is permitted, and deed restrictions still govern a great deal.
How we work
The first visit is measurements, a look under the existing vanity, and a photo of what is behind the wall wherever access allows. That determines whether the drain can stay, move in the wall, or requires something more involved. You get that answer before you are asked to choose finishes.
Once the cabinet and top are selected, we schedule so the countertop template happens after the cabinet is set and the fabrication window is accounted for. Demo, wall repair, plumbing rough, and cabinet set happen first; the room is usable in between where possible.
After template and fabrication, the top and sinks go in, plumbing gets connected and tested, backsplash and caulk follow, and mirrors and lighting finish it. Permitting varies between the City of Houston and unincorporated county areas, and we confirm what applies to your address.
To have someone measure your bathroom, call (281) 235-6971.
Common questions
Plywood or particleboard cabinet boxes?
In a Houston bathroom, plywood for the sink base at minimum. Particleboard performs fine while dry, but a slow supply-line weep or years of ambient humidity will swell it, and once it swells it does not come back. The upcharge for a plywood box is modest compared to replacing a vanity in five years, which is the actual alternative.
Does the countertop get measured before or after the cabinet is installed?
After. Templating on a set, leveled cabinet is the only way to get a top that fits a wall that is not straight, and almost no wall is. Measuring from drawings and ordering ahead saves a little time and regularly produces a top with a visible gap at the wall. The sequence costs a few days and is worth it.
Can I fit two sinks in my existing vanity space?
Often yes, but comfort depends on the width. Two bowls crammed into a narrow run leave no usable counter between them and make the faucets feel cramped. There is a point below which one large sink with two mirrors and better storage serves you better. We measure and lay it out to scale so you can see the real spacing before committing.
Will you have to break the slab to add the second drain?
Usually not. Most of the time the second drain can be picked up inside the wall cavity by extending the trap arm within allowable limits and tying in above the slab. Slab work is the last resort, and if it is genuinely required we say so early. On post-tension slabs, which are common in newer Houston-area homes, the tendons must be located before any cutting.
Do you cover Houston 77006?
Yes. Houston 77006 is about 15 miles from our shop at 1530 W Sam Houston Pkwy N, Houston, TX 77043, inside the area we work in daily. Call (281) 235-6971 to arrange a site visit.
MS Home Remodeling — double vanity installation in Houston, TX 77006. Call (281) 235-6971 for a site visit.