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How much does gas water heater replacement (40–50 gallon tank) cost in Washington?
Updated September 2026 · Washington price index 1.21 for plumbing work (national = 1.00)
In Washington, a licensed plumber typically charges $600 to $3,750 to replace a 40–50 gallon gas tank water heater like for like, with most jobs landing near $1,800. That is about 21% above the national average of $500–$3,100, based on what plumbers earn in Washington.
AI-powered second opinion using these same Washington figures. No account, no card. Need someone to do the work? Verified pros in Washington took the Fair Price Pledge.
What a Washington quote means
| Quote for this job | What it means |
|---|---|
| Under $360 | Suspiciously low — ask what is excluded, and check licensing and insurance |
| $360 – $4,125 | Fair price — inside the typical range (up to 10% over the top is still normal) |
| $4,125 – $6,563 | Running high — get the quote itemized, and get a second one |
| Over $6,563 | Ripoff territory — more than 1.75× the high end of the typical range |
Same rules the QuoteJury checker uses on every quote.
What you're paying for
What is usually included: The new tank, removal and disposal of the old one, new supply connectors and gas flex, a drip pan and expansion tank where required, permit, and 2–4 hours of labor.
What moves the price:
- Code upgrades at replacement time: expansion tank, seismic straps, pan, venting corrections and a shutoff valve
- Tank brand and warranty length (6-year versus 12-year models)
- Power-vent or direct-vent units, which cost considerably more than atmospheric-vent tanks
- Access: tight closets, attics and crawlspaces add labor
- Permit and inspection fees, which many quotes list separately
Tank size, venting type (atmospheric vs power vent), local labor rate, permit, and whether the unit is a like-for-like swap or needs code upgrades (expansion tank, pan, gas flex, drip leg).
Gas water heater replacement (40–50 gallon tank) cost across Washington
Typical range by metro and rural area, from BLS wage data for plumbers in each area.
| Area | Typical range | Most jobs |
|---|---|---|
| Bellingham, WA | $680 – $4,250 | $2,050 |
| Bremerton-Silverdale-Port Orchard, WA | $610 – $3,800 | $1,850 |
| Kennewick-Richland, WA | $660 – $4,100 | $2,000 |
| Longview-Kelso, WA | $590 – $3,650 | $1,750 |
| Mount Vernon-Anacortes, WA | $580 – $3,600 | $1,750 |
| Olympia-Lacey-Tumwater, WA | $600 – $3,700 | $1,800 |
| Seattle-Tacoma-Bellevue, WA | $690 – $4,250 | $2,050 |
| Spokane-Spokane Valley, WA | $550 – $3,400 | $1,650 |
| Walla Walla, WA | $530 – $3,300 | $1,600 |
| Wenatchee-East Wenatchee, WA | $540 – $3,350 | $1,600 |
| Yakima, WA | $480 – $3,000 | $1,450 |
| Eastern Washington nonmetropolitan area | $490 – $3,050 | $1,500 |
| Western Washington nonmetropolitan area | $500 – $3,100 | $1,500 |
Frequently asked
Is $1,800 a fair price for gas water heater replacement (40–50 gallon tank) in Washington?
Yes. $1,800 is right around what most homeowners in Washington pay. Anything from $360 to $4,125 is inside the normal range for a licensed plumber; above $4,125 it is worth getting a second quote.
Why do quotes for the same job vary so much?
Code upgrades at replacement time: expansion tank, seismic straps, pan, venting corrections and a shutoff valve. Tank brand and warranty length (6-year versus 12-year models). Company overhead matters too: a large company with trucks, dispatchers and a warranty department charges more than a one-person shop, and both can be honest prices.
When should I get a second quote?
Any time a quote lands above $4,125, or when the contractor cannot break it into parts, labor and fees. Ask for the itemized version, ask what would change the price, and confirm licensing and insurance. You can also paste the quote into the free QuoteJury checker for an instant second opinion.
Other plumbing jobs in Washington
- Electric water heater replacement (40–50 gallon tank)
- Gas tankless water heater installation
- Garbage disposal replacement
- Kitchen faucet replacement
- Toilet replacement
- Running or leaking toilet repair
- Clogged drain cleaning
- Sewer line camera inspection
- Sewer line hydro jetting
- Sump pump replacement
- Water pressure regulator (PRV) replacement
- Main water shutoff valve replacement
- Leaking pipe repair
- Water heater expansion tank installation
- Plumber service call and hourly rate
Gas water heater replacement (40–50 gallon tank) in other states
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Sources
- Angi (2026): $700–$2,700 nationally
- Fixr (2026): $700–$2,700 nationally
- HomeGuide (2026): $600–$3,100 nationally
- Bob Vila (2024): $700–$2,700 nationally
- Forbes Home (2025): $500–$2,500 nationally
- U.S. Bureau of Labor Statistics, Occupational Employment and Wage Statistics, May 2025 — median hourly wages by state and metro area
About these numbers. Ranges are typical market rates for a licensed, insured contractor, blended from published U.S. cost guides and adjusted with U.S. Bureau of Labor Statistics wage data (OEWS, May 2025) for each state and metro area. They are estimates, not a bid, appraisal or inspection. Real prices move with parts, access, permits and code requirements. The quote checker is AI-powered and labeled as such.