Commercial Plumbing in Shoreline, WA
Commercially licensed plumbers for Shoreline's public buildings, Aurora and North City businesses and prevailing-wage work, from our shop in Mukilteo
Stollwerck Plumbing & Sewer is commercially licensed and insured above Washington's minimums, and public work is a regular part of our schedule. For a Shoreline agency, property manager or business, that means one plumber who can rebuild a commercial water heater, add laundry or equipment connections, camera the sewer and file the prevailing-wage paperwork, and who plans the work around a building that never closes.
Real Commercial Work in Shoreline
In April 2026 Willie and Logan added a second set of washer and dryer connections at two fire stations, one in Ridgecrest and one in North City, so each could run two side-by-side commercial machines. The first day at each station was demolition from the laundry-room side and a plan; at one of them the station crew removed a lower cabinet so the drain could be chased further into the wall. Then the new waste was built for both washers, which meant raising the original washer box so the new waste line could pass beneath its trap and still meet code, the water was reconnected to the original box and run to the new one, and the gas lines were built to within about a foot of where the dryers would stand. Water and gas went on for testing, the new trap was primed, and at the Ridgecrest station the dryer was run and every joint the crew had made was checked. Because a station cannot be without water for long, the building was drained, refilled and purged of air in the same visit, with the recirculation line turned back on last.
The winter before, J.D. took a call from the North City station about its high-efficiency commercial water heater, a 199,000 BTU condensing unit showing a fan fault and a control fault. He diagnosed it, ordered the blower motor, the control board and the gasket to ship next-day, and replaced all three. The heater fired and came up to temperature, and only then did it become clear that the recirculation pump had also died, so a new circulator went in a few weeks later in December. The year before that, J.D., Logan and Justin replaced the 100-gallon gas water heater at the Ridgecrest station under the same prevailing-wage arrangement, and in May 2026 Logan and Chase moved the mop-sink supplies to the opposite wall at the Richmond Highlands station, adding vacuum breakers and boiler drains while they were in the wall.
Who We Work For in Shoreline
Public Agencies and Public Works
Public work in Washington is prevailing-wage work, and it needs a contractor whose licensing and insurance can carry it. We file the intent and the affidavit with Labor & Industries on every public job, document the line items the way an agency needs them, and schedule around a crew that is on duty around the clock.
Property Managers and Multi-Tenant Buildings
The apartment buildings and offices along Aurora and around North City share walls, stacks and water heaters, so one failed fixture reaches several tenants. We work with managers on turnovers, common-area plumbing and the water heater that serves the whole building, and report what we find in writing.
Restaurants and Retail
Wall-mount and pre-rinse faucets, hand sinks, floor sinks, grease lines and the backflow assembly your purveyor wants tested every year. We work around service hours where the job allows it.
The New Station-Area Buildings
The mixed-use buildings rising around the 148th and 185th light-rail stations bring commercial kitchens, laundry rooms and bike-room hose bibs to blocks that used to be single-family. New construction is not our trade, but the service work after the ribbon is cut is.
Shoreline-Specific Considerations
Prevailing Wage Is Paperwork as Much as Plumbing
Every public job carries an intent filed before the work and an affidavit filed after it, and the invoice has to show the prevailing-wage labor separately from the materials. We have done this often enough in Shoreline that the paperwork is routine, and it is the reason a fire station can hire us for a water heater rather than waiting for a larger mechanical contractor.
Buildings That Never Close
A fire station, a clinic or an apartment building cannot lose water for a day. Our approach is to do the demolition and the planning on one visit, order what is needed, and make the actual cutover in a single stretch: drain the building, make the connections, refill it, purge the air from every fixture and turn the recirculation back on before we leave.
Two Purveyors, One Cross-Connection Rule
Seattle Public Utilities serves buildings west of I-5 and North City Water District those east of it. Both run cross-connection programs under the state rule, so a commercial building’s backflow assembly gets tested every year whichever side of the freeway it sits on, and a new irrigation tap or equipment connection needs the right assembly from the start.
City Permits and the City’s Sewer
Gas piping, water heaters and fixture work in Shoreline are permitted by the City’s own permit office, not by the county health department, and side-sewer work is permitted by the City’s Wastewater Utility, which took over the former Ronald Wastewater District. We pull the permits through the City’s online portal and schedule the inspections.
Commercial Plumbing FAQ for Shoreline
Do you do prevailing-wage plumbing work in Shoreline?
Yes. Public buildings in Washington are prevailing-wage work, and we carry the licensing and the insurance to take it on. In Shoreline that has meant water heaters, laundry connections and mop-sink work at fire stations, each with the intent filed before the job and the affidavit filed after it.
Should a commercial water heater be repaired or replaced?
Repaired when the tank or heat exchanger is sound and the failed parts are available, replaced when the vessel itself is aging. A 199,000 BTU condensing heater at a North City station was worth a blower motor and a control board; a 75-gallon tank heater at a Richmond Highlands station was worth replacing outright.
Can you add washer and dryer hookups in a building that stays open?
Yes. At two Shoreline stations we added a second set of waste, water and gas connections for commercial machines, doing the demolition and layout on the first visit and the connections on the second. The water was off only for the cutover, and the building was refilled and purged the same day.
Who is responsible for a commercial building’s side sewer in Shoreline?
The property owner, from the building to the City’s main. Shoreline’s Wastewater Utility owns the mains and issues the permit for side-sewer work, so a backup or a break inside the property line is the owner’s repair. We camera the line first and show you where the problem sits and how deep before anyone quotes an excavation.
How quickly can you get to a Shoreline business?
Shoreline is about half an hour from our shop in Mukilteo, straight down I-5 or Aurora. Routine work is grouped with our other King County stops and usually scheduled within a few days, and an emergency at a building that cannot close goes to the front of the line.
Serving Shoreline From Mukilteo
Our shop is in Old Town Mukilteo, and Shoreline sits about half an hour south by I-5 or Aurora, which is why we run King County work in batches: a fire station in North City, a building on Aurora and a house in Briarcrest often share one day. Parts for a commercial water heater are ordered to ship next-day, and a genuine emergency goes on the next available truck.
Why Shoreline Businesses Choose Us
Licensed for Commercial Work
J.D. came up through commercial construction, and the company carries the licensing and insurance that public agencies, property managers and multi-tenant buildings require.
One Cutover, Not Three
We plan, order and then make the connections in a single stretch, so a building that cannot close loses water once and briefly.
A One-Year Guarantee, Commercial Included
Our workmanship is guaranteed for a full year on every job, including commercial water heaters and the rough-ins behind the walls.
Commercial Plumbing Trouble in Shoreline
Call the office with what is failing and when the building can have us in, and we will tell you which day we can put you on, or send the next truck if it cannot wait.