Plumber in Washington DC: 2026 Costs, Permits and Vetted Pros

What plumbers cost in Washington DC

These ranges cover labor and standard parts for a typical single-family home or rowhouse. They come from national cost data adjusted by the metro's construction cost factor of 1.04 from the U.S. Army Corps of Engineers Area Cost Factors, checked against local price guides.

Estimates for 2026, including labor and standard parts. Washington DC prices use the metro's construction cost factor of 1.04 (US average = 1.00) from the U.S. Army Corps of Engineers Area Cost Factors. Your quote depends on access, materials and the condition of the home.

Quotes land near the top of a range when the work is hard to reach: pipes inside plaster walls in a DC rowhouse, a sewer lateral under a sidewalk, or a crawl space in an older Alexandria home. After-hours and weekend calls cost more, and so does anything that needs a permit and an inspection visit.

For a number based on your own job, use the cost estimator below. It asks a few questions and applies the rate for your ZIP code.

Why plumbing breaks the way it does here

The metro has two very different housing stocks, and they fail in different ways.

Old pipes in the District and the inner suburbs

The District is the old core. About 31% of its housing units were built before 1940 and about 66% before 1980, according to the Census Bureau's American Community Survey. Alexandria and Arlington have older housing stocks too. Those houses often still have galvanized steel supply lines that rust from the inside, and cast iron drains that corrode and catch debris. A repipe or a camera inspection of the sewer line is a normal part of owning one.

The outer Virginia counties are the opposite. Loudoun's median home was built in 2003 and only about 11% of its homes predate 1980. Prince William's median is 1995. In those counties you are more likely to call a plumber about a failed builder-grade fixture or a water heater at the end of its life than about rusted pipe.

Lead service lines

DC Water estimates the District has more than 42,000 water service lines made of lead or galvanized iron, and says homes built before the 1980s were typically built with a lead service line (DC Water). Water leaves the plant essentially lead-free. The lead comes from the service line and the plumbing inside the house. DC Water's Lead Free DC program, launched in 2019, replaces lines on private property for free during DC Water and DDOT construction projects if the owner signs a Right of Entry form, and the Lead Pipe Replacement Assistance Program gives free or discounted private-side replacement in other cases (DC Water replacement programs). If your house is old and you do not know what your service line is made of, ask before you sign a repipe contract.

Freeze risk and the suburban cold

The city and the outer suburbs do not share a winter. Reagan National and Dulles sit in different climate zones, and Dulles gets about 21 inches of snow a year against 13.7 inches at National (NOAA NCEI 1991 to 2020 normals). Pipes in garages, crawl spaces and unheated additions in Fairfax, Loudoun and Montgomery counties see far more freeze hours than the same pipes inside the District. A burst pipe repair runs $520 to $5,200 here, so insulation and a shutoff you can reach are cheap insurance.

Sewer backups after heavy rain

The region gets its rain in bursts. The January 2016 blizzard dropped 17.8 inches at Reagan National and 29.3 inches at Dulles (NWS service assessment), and a July 2019 storm put about 80 mm of rain on the city in one hour (NASA GPM). In older rowhouse blocks, that water finds the floor drain in the basement. A backwater valve on the sewer lateral is the usual fix, and it needs a permit.

Do you need a permit?

Almost always, and the office depends on where the house is. This metro has three rule books.

District of Columbia

Plumbing and gas work in DC needs a permit from the Department of Buildings (DOB). Only a DC-licensed trade can pull a trade permit. Homeowners cannot apply for plumbing, mechanical or electrical permits themselves. DOB issues those only to licensed and bonded master trade professionals (DOB Homeowner's Center).

DOB permit fees are set by construction value. Work valued under $500 costs $33, or $36.30 with the 10% enhanced fee. Work valued $501 to $1,000 costs $65, or $71.50. Work valued $1,001 to $1 million costs $30 plus 2% of construction value, plus the 10% enhanced fee (DOB fee schedule). A filing deposit of 50% of the assessed fee is due with the application, capped at $20,000.

Maryland: Montgomery and Prince George's counties

In both counties, most plumbing work must be done by a WSSC Water-licensed plumber or gasfitter. That includes water and sewer service line repairs and replacements, interior repiping, and all gas work such as furnace and gas water heater replacements (WSSC Water). WSSC issues the plumbing and gas permits through its online ePermitting system. Paper applications are no longer accepted. First-time installation or replacement of a gas appliance needs a WSSC permit and a master gasfitter licensee, and the work must be inspected within 10 business days of installation (WSSC inspections).

The county still handles the building side. Montgomery County DPS takes residential alteration applications online and asks for inspections at least 24 hours ahead. Prince George's County DPIE adds a 10% technology fee to all its permitting fees (DPIE fee schedule).

Virginia: Arlington, Alexandria, Fairfax and the outer counties

Virginia's Uniform Statewide Building Code requires a permit for work on water supply, drainage or vent systems and for fuel supply systems (13VAC5-63-80). Replacing a plumbing fixture without changing the supply, drain or vent piping is exempt in a one- or two-family home. Fairfax County goes further and lists water heaters, disposals, sinks, tubs, showers, hose bibs and toilets as permit work, and requires a permit for kitchen and bathroom remodels (Fairfax County LDS). Arlington issues permits through Permit Arlington. Alexandria, Loudoun and Prince William each have their own building official under the same state code.

Before anyone digs

Call 811 before digging a water or sewer line. DC requires at least four days' notice, Maryland between 3 and 12 business days, and Virginia work can start 48 hours after a locate request (Miss Utility, Code of Virginia 56-265.17).

Common plumbing jobs and how long they take

Water heaters

A 50-gallon gas tank installed runs $730 to $3,200 here. A gas tankless unit runs $2,200 to $5,800, because it often needs a larger gas line and new venting. In Montgomery and Prince George's counties, a gas water heater replacement needs a WSSC permit and a master gasfitter, and the inspection has to happen within 10 business days. In DC, the permit comes from DOB. In Fairfax, LDS lists water heater replacement as permit work.

Sewer lines and water service lines: yours or the utility's?

In the District, the owner maintains the sewer service line. If DC Water finds the main sewer clear, the owner must hire a registered master plumber at their own expense to clear the lateral, and cleanup and damage are usually the owner's responsibility (DC Water). Report a backup to DC Water's 24-hour line at (202) 612-3400 first.

In Montgomery and Prince George's counties, WSSC Water handles water and sewer emergencies at 301-206-4002. In the Fairfax Water service area, the 24-hour emergency line is 703-698-5613 (Fairfax Water).

Gas work

Gas is the one job to leave alone. In Maryland, all gas work requires a WSSC-licensed master gasfitter and a WSSC permit. In DC, a master gas fitter pulls the gas permit. If you smell gas, leave the building first, then call 911 and Washington Gas at 844-927-4427 (Washington Gas).

Areas we cover

GOLDGCP plumbers work across the Washington metro, including:

• Washington DC, including Capitol Hill, Shaw, Petworth, Georgetown and Anacostia
• Arlington and Alexandria
• Fairfax County, including Fairfax City, Reston, McLean and Springfield
• Bethesda, Silver Spring and the rest of Montgomery County
• Northern Virginia, including Loudoun and Prince William counties

If your city isn't listed, tell us your ZIP code and we'll tell you whether a plumber in our network covers it.