Water Heater Replacement Cost in Flower Mound, TX (2026)

What You Can Expect to Pay in Flower Mound

For most Flower Mound homeowners replacing a standard 50-gallon tank, the installed cost—equipment plus labor—runs roughly $1,300 to $1,900 for gas and $1,300 to $1,800 for electric, based on contractor feedback specific to this market. Those figures do not automatically include permit fees, an expansion tank, a drain pan, or haul-away of the old unit. Budget an additional $150 to $800 for code-required add-ons, which are explained in the permit section below.

Tankless gas systems cost significantly more. A whole-house gas tankless unit with new gas line, condensing flue, and recirculation pump typically starts around $3,600 to $4,100 installed in the DFW area, depending on the complexity of the conversion.

Publisher disclosure: our owner also owns Varsity Zone of Frisco. Consider that relationship when comparing providers.

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Flower Mound Permit Requirements You Cannot Skip

The Town of Flower Mound requires a permit for every water heater replacement—gas or electric, no exceptions. Any contractor who offers to skip the permit is creating a problem you will discover at resale or during an insurance claim, because unpermitted work appears in the home’s permit history.

Key rules as of 2026:

• Contractor registration: Your plumber must hold a Texas state license and be registered with the Town of Flower Mound before pulling a permit. Verify current licensing at TSBPE.texas.gov.
• Final inspection window: State law requires an inspection after installation. Flower Mound’s window is 72 hours—tighter than most surrounding cities. Confirm your contractor schedules this before they leave the job.
• Expansion tank: Required on all new installations. Many older Flower Mound homes were replaced before this became standard and may not have one, so budget for it.
• Drain pan: Required when a leak could damage the surrounding structure or finishes.
• Garage elevation: Gas water heaters in garages must sit at least 18 inches above the floor unless the unit is a flammable vapor ignition resistant (FVIR) model.

For permit questions, contact the Building Inspections Department at 972-874-6355 or visit flowermound.gov/167/FAQs.

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Cost Ranges by Type

All figures below are installed planning ranges—equipment plus labor. They are not guaranteed quotes and do not represent a measured average of Flower Mound transactions. Get a written quote that itemizes equipment, labor, permit fee, expansion tank, drain pan, and haul-away before authorizing any work.

Standard Tank — Electric

Tank Size	Installed Range
30-gallon	$900 – $1,300
40-gallon	$1,100 – $1,400
50-gallon (most common)	$1,300 – $1,800
75-gallon	$1,700 – $2,200
80-gallon	$1,900 – $2,500

Standard Tank — Gas

Tank Size	Installed Range
40-gallon	$1,100 – $1,600
50-gallon (most common)	$1,300 – $1,900

Some DFW-area plumbers use a broader preliminary budget of $2,100 to $3,000 for a standard tank replacement when access, venting changes, or gas line work is involved. That wider range is a planning ceiling, not a typical starting point.

Tankless Gas

Scenario	Installed Range
Like-for-like tankless swap	$2,500 – $3,500
Full conversion (new gas line, condensing flue, recirculation pump)	$3,600 – $4,100+

Code Add-Ons (Budget Separately)

Item	Typical Cost
Expansion tank	$150 – $350
Drain pan	$75 – $200
Permit fee	Varies; confirm with Town
Haul-away of old unit	$50 – $200 (often included)

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Repair vs. Replace: A Practical Threshold

If your water heater is under eight years old and the repair is straightforward, fixing it often makes sense. Common Flower Mound repair costs for reference:

• Thermocouple replacement (gas): $240 – $420
• Gas valve replacement: $620 – $1,030
• Upper heating element (electric): $450 – $750
• T&P valve replacement: $470 – $790

Once a tank is past eight to ten years and a repair quote exceeds roughly half the cost of a new installed unit, replacement is usually the better investment. An aging tank that needs a $700 repair today may need another one within a year.

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What a Written Quote Should Include

Before signing anything, ask your contractor to provide a written scope that specifies:

1. Equipment brand, model number, capacity, and first-hour rating
2. Labor cost, separately stated
3. Permit fee and confirmation that the contractor will pull the permit and schedule the 72-hour inspection
4. Expansion tank (required in Flower Mound)
5. Drain pan, if applicable to your installation location
6. Haul-away and disposal of the old unit
7. Any gas line, venting, or electrical upgrades required
8. Warranty terms—distinguish the manufacturer’s equipment warranty from any labor guarantee the contractor offers

A quote that bundles everything into one number without itemizing makes it impossible to compare bids accurately.

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A Local Provider Worth Contacting

Legacy Plumbing lists Flower Mound explicitly in its service area and holds Plumbing License M-37588. They are one verified option for getting a local quote. As with any contractor, confirm their current Town of Flower Mound registration and verify their license at TSBPE.texas.gov before scheduling work.

This publication does not rank contractors or designate any provider as the best option. The mention above reflects verified service-area coverage, not an endorsement based on independent testing.

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Frequently Asked Questions

Do I need a permit to replace a water heater in Flower Mound if I own the home? Yes. The Town requires a permit regardless of whether a licensed contractor or the homeowner performs the work. The permit also triggers a required inspection within 72 hours of installation.

Why does my quote include an expansion tank when my old water heater didn’t have one? Flower Mound now requires a thermal expansion tank on all new installations. Many homes replaced their water heaters before this rule was in effect. If your system has a check valve or pressure-reducing valve on the supply line, the expansion tank prevents pressure buildup that can damage the new unit.

How long does a standard tank water heater last in North Texas? Most tank water heaters last eight to ten years. Hard water in the DFW area can accelerate sediment buildup, which shortens tank life and reduces efficiency. Annual flushing helps, but a tank past ten years is a reasonable candidate for proactive replacement.

Is a tankless water heater worth the higher upfront cost? For households with high or staggered hot water demand, tankless units can reduce energy use and eliminate the risk of running out of hot water. The payback period depends on your usage pattern, gas rates, and whether significant conversion work is required. Get a side-by-side quote for both options before deciding.

What happens if a contractor does the work without a permit? Unpermitted work in Flower Mound appears in the home’s permit history. This can complicate a home sale, void a homeowner’s insurance claim related to the water heater, and may require the work to be redone at your expense to bring it into compliance.