Toilet Installation and Replacement in King County, WA
New toilets, shutoffs and flanges
Lighthouse Plumbing installs and replaces toilets across King County from our shop in Fall City: a new Toto or American Standard toilet we supply, or one you've already bought. Every install gets a new wax ring, closet bolts and supply line, a look at the flange and the shutoff, and a leak test before we haul the old toilet away.
Recent Toilet Installations
In late August, PJ and Alex replaced two toilets in a Duvall house with Toto Drake elongated, comfort-height toilets with soft-close seats. While the water was off, they swapped the old multi-turn shutoffs behind both toilets for quarter-turn valves, so the next time someone needs the water off it takes a quarter turn instead of a fight with an old valve. Each toilet was set and sealed on new supply connections, and they tested both for leaks and a clean flush before hauling the old ones away. The whole job took about two hours.
In June, Bradyn went to a Bothell house where an upstairs toilet was leaking at the base. He offered to reset it on a new wax ring or replace it, and the homeowners chose a new comfort-height Toto Drake. The flange under the old toilet turned out to be all plastic, which Bradyn noted as the likely reason the old seal had failed.
In October, Caleb installed a toilet an Issaquah homeowner had bought. When the old one came up, rust on the flange showed there had been a leak at some point, though the floor was dry, so he set the new toilet on new closet bolts and a new wax ring with a new supply line and tested it. The shutoff behind it wouldn't close, so the water had to be turned off at the main.
Not every call ends in a new toilet. In July, PJ and Alex looked at a Snoqualmie toilet with a failed fill valve, found the toilet itself in good shape, and replaced just the fill valve and the supply line. And in Redmond's Bear Creek neighborhood, PJ replaced a powder-room toilet with a Toto Drake and rebuilt a second one, a job told in our Redmond toilet story.
What We Install
New toilets we supply
Most of the toilets we install are Toto Drakes or American Standard Cadet Pros, in elongated or round-front bowls and standard or comfort height. They go in with a new wax ring, closet bolts, a braided stainless supply line and a soft-close seat, and we take the old toilet with us.
Toilets you've bought
We'll install a toilet you've picked out, from a basic two-piece to a TOTO Neorest like the one Caleb installed near Renton in September, where he also put in a new quarter-turn shutoff. Tell us the model when you book so we bring the right supply line.
Shutoff valves
Old multi-turn shutoffs can refuse to close, or start to drip once they're finally turned, like the one behind the Issaquah toilet. A toilet swap is the cheapest time to replace one with a quarter-turn valve.
Flanges
The flange is the fitting in the floor that the toilet bolts to and seals against. When it's cracked, rusted, loose or worn, we repair or replace it, because a new toilet on a bad flange can leak at the same spot the old one did.
What Decides the Install
The rough-in
The rough-in is the distance from the wall behind the toilet to the center of the drain, and the new toilet has to match it. In Brier in April, PJ and Reid set two Cadet Pros in one house, one on a 10-inch rough-in and one on a 12-inch, and in September Caleb replaced a toilet near Renton with a Toto made for a 10-inch rough-in.
Bowl shape and height
Elongated bowls are longer and more comfortable to sit on; round-front bowls save a few inches in a small bathroom. Comfort-height toilets, sometimes sold as ADA height, put the seat 17 to 19 inches off the floor, the range in the federal ADA standards, a couple of inches taller than an older standard bowl.
What's under the old toilet
We look at the flange and the floor on every install, because they decide whether the new seal holds. In June, Mykal replaced two toilets in another Duvall house and found one flange starting to separate from the concrete slab. The Issaquah flange was rusted, and the Bothell flange was all plastic.
Our Process
1. Look at what's there
We check the toilet, the flange, the shutoff and the rough-in, and give you the price before we start.
2. Shut off and remove
We close the shutoff, or the main if the shutoff won't hold, disconnect the supply and lift the old toilet off the flange.
3. Set the new toilet
The new toilet goes down on a new wax ring and closet bolts, level and secure, with a new supply line.
4. Test and haul away
We flush it, check the base and the supply connection for leaks, and take the old toilet with us.
Frequently Asked Questions
How much does it cost to replace a toilet?
On our 2026 invoices, replacing one toilet with a new Toto Drake or American Standard Cadet Pro that we supply ran about $950 to $1,350 with tax, including the wax ring, bolts, supply line, seat and haul-away. Two toilets on one visit ran about $1,900 to $2,200, and installing a toilet you bought about $500 to $800.
What moves the price: a flange that needs repair, a shutoff that needs replacing, a rough-in other than 12 inches, or a smart toilet like the Neorest, which took a new shutoff and its own supply line.
What is a toilet rough-in, and how do I measure it?
The rough-in is the distance from the finished wall behind the toilet to the center of the drain under it. Measure from the wall, not the baseboard, to the center of the bolts that hold the toilet down. Most houses have a 12-inch rough-in, but 10-inch and 14-inch drains exist, and the new toilet has to match.
Can you install a toilet I bought myself?
Yes. We install toilets homeowners have bought, from basic two-piece models to smart toilets like the TOTO Neorest, with a new wax ring, bolts and supply line, and we haul the old one away. Tell us the model when you book, and check the box for damage before we arrive, because cracked china can't be fixed on site.
How long does it take to replace a toilet?
Usually about an hour for one toilet when nothing under it needs work. On our 2026 jobs, single replacements in Kirkland, Fall City and near Renton took about 40 to 70 minutes on site, and the two toilets in Duvall took about two hours. A clogged old toilet, a bad flange or a shutoff that won't close adds time.
Why does a new toilet rock or leak at the base?
Usually because of what's under it. A flange that is cracked, rusted, plastic and worn, or set too low leaves the wax ring nothing solid to seal against, and an uneven floor lets the bowl rock and break the seal. We check the flange and the floor before setting a new toilet, and shim or repair what we find.
Toilet Installation Across Our Service Area
We install toilets from Fall City and the Snoqualmie Valley to the Eastside, Seattle and the north end. Our stories from the field include a Toto Drake replacement in Bear Creek, Redmond, three new toilets in a Duvall house, a toilet repair in Carnation and a toilet leak in Issaquah. We also have city pages for toilet installation in Carnation and toilet installation in Seattle. For running toilets, clogs and leaks that don't call for a new toilet, see toilet repair.
Plumbing in Duvall · Plumbing in Brier · Plumbing in Issaquah
Why Homeowners Call Lighthouse for a New Toilet
We'll tell you when a part will do
When a fill valve or a flapper is the problem, we replace the part, as PJ and Alex did in Snoqualmie.
We look under the toilet, not just at it
The flange, the floor and the shutoff get checked on every install.
The old toilet leaves with us
We haul it away the same visit.
Licensed, Bonded & Insured
Washington Plumbing Contractor License: LIGHTP*762K2
Coverage: Fully bonded and insured
Learn how to verify our license or check directly at secure.lni.wa.gov/verify.