DC Water Heater Permit Cost (2026)

Residential water heater replacement permit fees in Washington, DC, pulled directly from the DOB Building Permit Fee Schedule on dob.dc.gov (captured April 25, 2026). DC prices a water heater swap as a single plumbing fixture or appliance line item: $26 for the first fixture, plus the District's universal 10% DOB Enhanced Fee, for $28.60 all-in. Each additional fixture on the same plumbing permit is $20 ($22.00 with the Enhanced Fee). A gas conversion or a new gas burner is a separate $50.60 line item. There is no state levy in the federal district. Verify your current plumbing permit fee with the DC Department of Buildings at (202) 671-3500.

First Plumbing Fixture (base)

$26.00

10% DOB Enhanced Fee

$2.60

Single Water Heater All-In

$28.60

Each Additional Fixture

$22.00

Gas Conversion / Burner

$50.60

Fee Status

Official DOB Schedule

What This Guide Covers - and What It Does Not

This guide covers: Washington, DC residential plumbing permit fees for a water heater replacement as published in the DOB Building Permit Fee Schedule (dob.dc.gov, captured April 25, 2026). Coverage includes the per-fixture plumbing rates ($26 first fixture, $20 each additional), the universal 10% DOB Enhanced Fee, the $28.60 Instant Permit per-fixture rate, and the $50.60 gas conversion / burner line item.

This guide does NOT cover: The cost of the water heater unit, expansion tank, venting, or any plumbing hardware. Licensed plumber labor. Sprinkler, sewer, or water-service line work, which the schedule prices separately. Any electrical work for an electric model. These are separate from the DC permit fee.

How the fee is set: DC itemizes plumbing work per fixture and per appliance. A replacement water heater is priced as the first fixture or appliance at $26 ($28.60 with the Enhanced Fee). DC does not bundle plumbing into a base building permit fee - a water heater swap is its own small plumbing permit.

When a plumbing permit is required: A water heater replacement requires a plumbing permit. A like-for-like swap can often be filed through DOB's Instant Permit at $28.60 per fixture. A gas conversion or new gas burner is priced on the separate $50.60 line. Verify your project's permit path with the DC Department of Buildings before starting.

Key Takeaways

DC prices a water heater as a single plumbing fixture or appliance: $26 base plus the universal 10% DOB Enhanced Fee = $28.60 all-in for a standalone replacement.
Each additional fixture on the same plumbing permit is $20 base ($22.00 with the Enhanced Fee), so a heater plus one added fixture is $50.60 all-in.
A like-for-like water heater swap can often be filed through DOB's Instant Permit at $28.60 per fixture.
A gas conversion or a new gas burner is a separate $50.60 line item (with the Enhanced Fee), not the standard $28.60 fixture line.
There is no state levy in the federal district. The 10% DOB Enhanced Fee is the only add-on to the base plumbing line.
The permit fee is a District charge only. It excludes the water heater unit, expansion tank, venting, plumber labor, and any electrical work.
Source: DOB Building Permit Fee Schedule on dob.dc.gov, captured April 25, 2026. The schedule is a live page without a stamped effective date; PermitPrice re-verifies it quarterly. Confirm current rates with DOB at (202) 671-3500 before filing.

Calculate Your Plumbing Permit All DC Permit Fees

DC Water Heater Permit Fee Components

A DC residential plumbing permit for a standalone water heater replacement is built from two lines: the first-fixture plumbing line ($26) and the universal 10% DOB Enhanced Fee applied to it. There is no state levy and no separate plan-review fee for a single-fixture plumbing permit.

Component	Amount (single water heater)	How It Is Calculated
Plumbing fixture (first fixture / appliance)	$26.00	Base rate per the DOB schedule for the first plumbing fixture or appliance. A water heater is one fixture.
10% DOB Enhanced Fee	$2.60	10% of the $26 base, applied to every DOB permit line item.
All-in water heater total	$28.60	$26 first fixture + $2.60 Enhanced Fee. No state levy in the federal district.

DC Plumbing Fixture and Appliance Rates

DC itemizes plumbing work per fixture and per appliance. A water heater is the first fixture. The all-in column adds the 10% DOB Enhanced Fee where the schedule states a base rate; the Instant Permit and gas-conversion rows are stated by DOB already inclusive of the Enhanced Fee.

Plumbing Line Item	Base / Stated Rate	All-In (with 10% Enhanced)
First fixture or appliance (water heater)	$26.00	$28.60
Each additional fixture	$20.00	$22.00
Instant Permit per fixture / appliance	$28.60	$28.60
Gas conversion / burner installation	$50.60	$50.60

Source: DC DOB Building Permit Fee Schedule on dob.dc.gov/node/1620346, captured April 25, 2026 - plumbing per-fixture rates ($26 first, $20 each additional), Instant Permit per fixture ($28.60), and gas conversion / burner installation ($50.60), each with the universal 10% DOB Enhanced Fee. The all-in column applies the 10% Enhanced Fee to the base fixture rates. Verified April 2026.

Worked Examples - Real Water Heater Jobs in Washington DC

Each example uses the same DC plumbing fee schedule. DC prices the permit per fixture and appliance, so the cost rises with the number of fixtures on the permit and with whether the job needs gas-line work.

Example 1: Like-for-like water heater replacement (verified reference example)

A homeowner replaces a failing 50-gallon tank water heater with a new one of the same fuel type. The job is a single plumbing fixture or appliance, filed as the first fixture - often through DOB's Instant Permit. This is the verified reference example for a DC water heater permit.

First plumbing fixture (base): $26.00
10% DOB Enhanced Fee on the $26 base: $2.60
Total all-in plumbing permit: $28.60

Example 2: Water heater plus an added utility sink (two fixtures)

A homeowner replaces the water heater and adds a new utility sink on the same plumbing permit. That is two fixtures: the first at $26 and the second at $20. The figures below are arithmetic from the verified per-fixture rates.

First fixture (water heater): $26.00
Additional fixture (utility sink): $20.00
10% DOB Enhanced Fee on the $46 base: $4.60
Total all-in plumbing permit: $50.60

Arithmetic from the verified per-fixture rates ($26 first + $20 additional = $46, plus 10% Enhanced Fee = $50.60). DC charges per fixture, so each added fixture raises the permit.

Example 3: Gas conversion or new gas burner (separate line item)

A homeowner converts an electric water heater to gas, or installs a new gas burner. DC prices a gas conversion / burner installation on its own line at $50.60 (already stated with the Enhanced Fee), separate from the standard $28.60 fixture line.

Gas conversion / burner installation (with Enhanced Fee): $50.60
Total all-in for the gas line item: $50.60

From the verified DOB gas conversion / burner installation line ($50.60 each, with Enhanced Fee). A gas conversion may also involve the fixture line and a mechanical inspection; confirm the full scope with DOB.

Calculate Your DC Plumbing Permit

The PermitPrice fee calculator models DC's per-fixture plumbing rates plus the 10% DOB Enhanced Fee. Enter the number of fixtures and the calculator returns the all-in permit cost broken down by component.

Calculator coverage for DC plumbing permits: the per-fixture rates ($26 first, $20 each additional) and the 10% DOB Enhanced Fee. A standalone water heater is one fixture ($28.60 all-in). The unit, venting, plumber labor, and any gas or electrical work are separate and not included.

Open the Permit Fee Calculator

Water Heater Permit Cost: Washington DC vs Fairfax

DC and Fairfax County price a water heater permit very differently, so these figures are not apples-to-apples. DC itemizes a single fixture at a low flat rate. Fairfax charges a fixture-count plumbing trade permit with a much higher floor.

Jurisdiction	Water Heater Permit Formula / Rule	All-In Permit Cost
Washington DC	Plumbing fixture $26 first + 10% DOB Enhanced Fee	$28.60 (single fixture)
Fairfax County	Plumbing permit $340 (1-5 fixture tier) + 2% levy	$346.80 (single heater)

DC prices a single fixture at $28.60; Fairfax has a $340 plumbing-permit floor for any job of 1 to 5 fixtures. These are different fee models and are not directly comparable line-for-line. Neither figure includes the water heater unit, venting, plumber labor, or any gas or electrical work. See the full side-by-side breakdown in the comparison guide.

Related DC Permits

A water heater swap often rides alongside HVAC or electrical work. See the related DC trade-permit guides and the full comparison.

Fairfax vs DC Water Heater → DC HVAC Permit → DC Electrical Panel Permit →

Frequently Asked Questions

How much does a water heater permit cost in Washington, DC?

A standalone water heater replacement permit in DC costs $28.60: a $26 first-fixture plumbing line plus DC's 10% DOB Enhanced Fee of $2.60. A like-for-like swap can often be filed through DOB's Instant Permit at the same $28.60 per fixture.

Why is the DC water heater permit so much cheaper than Virginia jurisdictions?

DC itemizes plumbing work per fixture, so a single appliance like a water heater is priced at one fixture ($26 + 10% = $28.60). Many Virginia jurisdictions, including Fairfax, set a flat plumbing-permit floor (Fairfax's 1-5 fixture tier is $340), and Virginia adds a 2% state levy that DC does not have. The fee models are simply different.

Is the permit fee the only cost of replacing a water heater in DC?

No. The $28.60 is the DC permit fee only. It does not include the water heater unit, expansion tank, venting or fittings, the licensed plumber's labor, or any gas-line or electrical work a fuel change might require. Those are separate and are usually the larger part of a water heater budget.

Can I use DC's Instant Permit for a water heater?

Often, yes. DOB's Instant Permit program prices a plumbing fixture or appliance at $28.60, which matches the first-fixture rate. A like-for-like water heater swap is the kind of straightforward residential scope the program is designed for. Confirm eligibility with DOB, since a gas conversion or added scope may require a standard permit.

Does a gas water heater cost more to permit in DC?

A like-for-like gas water heater swap is still priced as one fixture ($28.60). But a gas conversion or a new gas burner is a separate line item at $50.60 (already stated with the Enhanced Fee). If your job moves or adds a gas line, expect that $50.60 line in addition to or instead of the standard fixture line - confirm with DOB.

Is there a state levy on DC permits?

No. DC is a federal district, not a state, so there is no Virginia-style 2% state levy. The only add-on to the base plumbing line is the universal 10% DOB Enhanced Fee, which is already included in the $28.60 all-in figure.

Do I need a permit to replace my water heater in DC?

Yes. A water heater replacement requires a plumbing permit in DC. The good news is the fee is low ($28.60) and a like-for-like swap can often be filed through the Instant Permit. Verify your permit path with the DC Department of Buildings at (202) 671-3500 before starting.

How does the DC water heater permit compare to Fairfax County?

DC prices a single fixture at $28.60. Fairfax County sets a $340 plumbing-permit floor (the 1-5 fixture tier), so a single water heater there is $346.80 with the 2% Virginia state levy. These are different fee models and are not directly comparable line-for-line; neither includes the unit, venting, labor, or gas/electrical work. See the full Fairfax vs DC water heater comparison.

Sources

Official .gov Sources - Verified April 2026

DOB Building Permit Fee Schedule - DC Department of Buildings Captured April 25, 2026 - live page on dob.dc.gov. Primary source for the per-fixture plumbing rates ($26 first, $20 each additional), Instant Permit per fixture ($28.60), gas conversion / burner ($50.60), and the 10% DOB Enhanced Fee. Verified April 2026 Verified
Permitting in the District of Columbia - DC DOB Accessed April 2026 - DOB permitting hub and Instant Permit program; phone (202) 671-3500

Next Step

Calculate your specific DC plumbing permit cost or compare against neighbors.

Use the Calculator → All DC Permit Fees DC HVAC Permit Guide

Fairfax Water Heater Guide → Fairfax vs DC Comparison → DC Electrical Panel Permit → All Guides →

Always verify current plumbing permit fees directly with the DC Department of Buildings before budgeting or filing. The DOB Building Permit Fee Schedule on dob.dc.gov is published as a live page without a stamped effective date; PermitPrice captured it on April 25, 2026 and re-verifies it quarterly. Call (202) 671-3500 or use the DOB permitting portal to confirm the per-fixture plumbing rate, Instant Permit eligibility, the gas conversion line, and any inspection requirements before submitting an application.

Disclaimer: All fee information on PermitPrice is for informational purposes only and is not an official permit quotation. Actual permit fees are determined by the DC Department of Buildings at the time of application. The plumbing permit fee is set per fixture; the all-in figures add the 10% DOB Enhanced Fee. Permit fees exclude the water heater unit, venting, plumber labor, and any gas or electrical work. Verify directly with DC DOB before filing.

Written by: Munib Ur Rehman

Data verified against official fee schedule documents.