Short definition
A wall-hung lavatory is a bathroom sink mounted directly to the wall with no pedestal or leg beneath. A steel hanger bracket — lagged through finish wall into 2×6 horizontal blocking inside the framing — supports the bowl. The plumbing (P-trap, supplies, shutoffs) stays exposed below. Common in pre-1970 Washington homes, and the default for ADA accessibility today.
What it is
A wall-hung lavatory has only one structural element: the wall. The bowl bolts to a metal cleat (or directly through-bolts into wall blocking) so it cantilevers out from the wall surface with nothing under it. The trap and supply lines run exposed to the wall behind, with angle stops in plain sight.
Code and trade practice expect 2×6 horizontal blocking mid-stud height inside the wall behind the bowl, anchoring the lag bolts. Pre-WWII installs sometimes lagged the sink directly to studs without dedicated blocking, which doesn’t last. Standard rim height is 31 to 32 inches off the finish floor for residential; the ADA forward-approach maximum is 34 inches. ADA accessible bathrooms also require 27-inch knee clearance below the apron and insulated hot supply and drain lines so a wheelchair user doesn’t burn against the bare metal underneath.
Wall-hung is the cheapest and structurally simplest of all lavatory mounts. It’s also the most accessible — the open space below makes it the default for ADA bathrooms, aging-in-place remodels, and “roll-under” sink configurations.
Why it matters to a homeowner
Wall-hung lavatories show up in Washington for two distinct reasons, and they push toward different decisions.
Reason one: pre-1970 housing stock. Most bathrooms in older Seattle, Tacoma, Spokane, and Everett single-family homes from roughly 1900 to 1965 shipped with wall-hung lavatories. They’re often paired with cast-iron drum-trap drains (now generally banned for new installs but grandfathered) and S-trap drain configurations (banned everywhere). Pulling the sink usually exposes one or more of these legacy issues. Plan for cascade work.
Reason two: aging-in-place. Modern accessibility-conscious remodels are reversing the 1980s-90s shift to vanities. A wall-hung lavatory at the 34-inch ADA rim with insulated drain and supplies is the default wheelchair lavatory.
In both cases, the load-bearing detail is the wall blocking. A wall-hung sink with no 2×6 backing inside the wall will sag and crack within a few years, and fixing it means cutting drywall, installing the lumber, and refinishing. If you’re swapping a vanity for a wall-hung in an older WA home, expect to open the wall — don’t skip the framing inspection.
Washington note
Wall-hung lavatories are the signature pre-1970 bathroom sink in Puget Sound. Three practical patterns to know:
- Cascade legacy work. A wall-hung pull in a 1920s Seattle bungalow or a 1950s Tacoma rambler often exposes a drum trap (cast iron, no longer code-compliant for new installs but grandfathered if functional), an S-trap drain (banned, must be reworked to a P-trap with proper venting), galvanized supply lines, and missing or rotten 2×6 wall blocking. Budget the wall-opening work into the project before the sink swap, not after.
- The 1980s vanity wave. Many WA wall-hung lavatories were replaced with vanities during the 1980s and 1990s remodel cycle. If your bathroom has a 1985-era vanity in a 1925 house, the original wall-hung sink mounting holes are usually patched in the back wall — useful evidence when you’re trying to figure out the original layout.
- Aging-in-place reversal. Modern WA accessibility remodels — driven by the area’s aging housing stock and aging owner demographics — go back to wall-hung lavatories with ADA insulation kits. Roll-under access plus a 34-inch rim plus insulated supplies is the default specification.
The state’s own building-code amendments (WAC 51-51 / 51-56 series) adopt the standard UPC fixture rules without a Washington-specific deviation on wall-hung mount blocking, which means manufacturer instructions plus carpentry standard practice (2×6 horizontal blocking) is the de facto rule. Verify with your local jurisdiction before relying on prescriptive code text.
Common failure modes
- Wall mount pull-out — lag bolts pull out of drywall when no blocking exists. Bowl tilts forward, mount cracks. Open wall, install 2×6, refinish, remount.
- Hidden water damage — chronic minor leak at the supply or trap drips down the back of the wall. Rotted studs and sheetrock. Often only discovered when the sink is pulled.
- Rusted hanger bracket — pre-1960 steel brackets corrode in chronically humid WA bathrooms. Replace with stainless or new manufacturer mount.
- Pop-up assembly leak — same fixes as any lavatory.
- Cracked porcelain at mounting holes — over-torqued lag bolts crack the rear flange of the bowl. Cosmetic until water reaches the crack, then catastrophic.
Common variants and what a wall-hung lavatory is not
- Wall-hung vs. pedestal. Pedestal adds a column hiding the plumbing.
- Wall-hung vs. console. Console adds two front legs.
- Wall-hung vs. semi-pedestal. Semi-pedestal hangs from the wall with a cosmetic half-pedestal hiding only the trap (no floor contact).
- Wall-hung lavatory vs. floating vanity. Floating vanity is a closed cabinet hung from the wall — different storage and accessibility profile.