Home >> New Construction Plumbing Tips for Argyle, TX Homebuyers

March 14, 2026

Argyle, Texas is one of the fastest-growing communities in Denton County. With master-planned subdivisions like Harvest, Canyon Falls, and The Highlands at Trophy Club expanding year after year, thousands of families are moving into brand-new construction homes across the area. If you're one of them, congratulations — a new home is an exciting milestone. But before you sign the closing papers and pop the champagne, there's a critical step most buyers overlook: an independent plumbing inspection.

At Haltex Plumbing in Argyle, we've inspected hundreds of new construction homes across Denton County, and the results might surprise you. Even in homes that passed the builder's own inspection, we routinely find plumbing issues that range from minor inconveniences to problems that could cost thousands of dollars down the road. Here's what every Argyle homebuyer needs to know about new construction plumbing — and what to look for before the home is yours.

Why New Homes Aren't Immune to Plumbing Problems

There's a common misconception that a new home means everything is perfect. After all, the pipes are new, the fixtures are fresh out of the box, and the home just passed a city inspection. So what could go wrong?

Quite a lot, actually. Argyle's rapid growth has stretched the local construction workforce thin. Builders are managing multiple projects across subdivisions simultaneously, and the subcontractors handling plumbing are often under tight deadlines to complete rough-ins and finish work. That time pressure leads to mistakes — not because the plumbers are unqualified, but because the pace of production doesn't always allow for careful quality control.

The municipal inspection process adds another layer of false security. City inspectors in growing areas like Argyle may be responsible for dozens of inspections per day. They check for code compliance on the major items — proper venting, correct pipe sizing, backflow prevention — but they don't have time to test every connection, check every drain slope, or evaluate whether the builder's fixtures are adequate for the home's size and layout.

The Top 7 Plumbing Issues We Find in New Argyle Homes

Based on our experience inspecting new builds throughout Argyle and Denton County, these are the most common problems we uncover:

1. Improperly Graded Drain Lines

Drain lines need a consistent downward slope — typically 1/4 inch per foot — to carry wastewater away from your home by gravity. In new construction, we frequently find sections of drain line that are flat, have a belly (a low spot where water pools), or even slope slightly upward. These defects cause slow drainage, recurring clogs, and can eventually lead to full drain backups that require professional drain cleaning.

The problem often develops after the initial plumbing rough-in. The concrete slab is poured over the drain lines, and then months of construction activity — heavy equipment driving over the slab, settling of fill dirt, foundation curing — can shift the drain pipes slightly. A quarter-inch of movement doesn't sound like much, but it can turn a properly graded line into a problem area.

2. PEX Connection Failures

Nearly every new home in Argyle uses PEX (cross-linked polyethylene) for water supply lines. PEX is excellent material — it's flexible, resistant to freezing, and doesn't corrode like copper. However, the connections between PEX and fittings are where problems occur. Crimp rings that aren't properly compressed, expansion fittings that aren't fully seated, and SharkBite-style push fittings that weren't pushed in all the way can all develop slow leaks months after the home is occupied.

These leaks often start inside walls or under cabinets where they go unnoticed until they've caused water damage. Our water leak detection service uses pressure testing to identify weak connections before they fail.

3. Builder-Grade Water Heaters

Most new Argyle homes come with the least expensive water heater the builder could specify — typically a 40 or 50-gallon standard tank unit. For a 2,500+ square-foot home with three or four bathrooms (common in Harvest and Canyon Falls), these units are often undersized. You'll notice the problem the first time two showers run simultaneously or when you try to run the dishwasher while someone's bathing.

Beyond sizing, builder-grade water heaters often come with shorter warranties and basic components. The anode rod — the sacrificial metal piece that protects the tank from corrosion — is usually the cheapest option available. In Argyle's hard water, that means the anode rod may need replacing within 2-3 years rather than the typical 5-6.

4. Missing or Incorrect Backflow Prevention

Texas plumbing code requires backflow prevention devices on irrigation system connections and certain other fixtures to prevent contaminated water from flowing back into your home's drinking water supply. In new Argyle subdivisions where homes connect to the city water system, we occasionally find backflow preventers that are the wrong type for the application, installed backward, or missing entirely on the irrigation stub-out.

This is especially important for homes in subdivisions that are transitioning from well water to city water infrastructure. The requirements are different, and sometimes the plumbing subcontractor doesn't account for the specific connection type.

5. Inadequate Outdoor Plumbing

Argyle properties tend to be larger than typical suburban lots. Many homeowners plan to add outdoor kitchens, pool houses, horse facilities, or workshop buildings after they move in. However, the builder typically installs the minimum number of outdoor hose bibs — often just one in the front and one in the back. On a half-acre or one-acre lot, that's not enough coverage.

If you're planning outdoor plumbing additions, it's much easier and less expensive to run supply lines during construction (before the landscaping is done) than to retrofit them later. An outdoor spigot installation starts at $275+ when done as a standalone job.

6. Toilet Installation Issues

We've pulled brand-new toilets in Argyle homes and found wax rings that weren't properly seated, closet flanges that were set too high or too low, and even toilets that weren't bolted to the floor tightly enough. A toilet that rocks slightly on its base will eventually break the wax seal, causing leaks that damage the subfloor and can lead to mold growth between the slab and the flooring material.

7. Incomplete or Inaccessible Cleanouts

Every home should have accessible cleanout access points for the main sewer line. In new construction, these cleanouts are sometimes buried under landscaping, covered by concrete work, or installed in locations that are difficult to reach. When you eventually need sewer line service, inaccessible cleanouts mean the plumber has to find alternative access points — adding time and cost to the job.

Well Water vs. City Water: Know Your System

One of the unique aspects of buying in Argyle is the mixed water infrastructure. Newer subdivisions like Harvest and Canyon Falls connect to municipal water systems, giving homeowners treated city water with consistent pressure and quality testing. However, some newer developments on the outskirts of Argyle and older rural properties still rely on private well water and septic systems.

If you're buying a home on well water, your plumbing inspection needs to include additional items: the well pump and pressure tank condition, water quality testing for minerals and bacteria, and the septic system's condition and capacity. We cover this topic in depth in our guide to well water vs. city water in Argyle.

For city water homes, check the water pressure at the main line. Argyle's growing water infrastructure sometimes delivers pressure that's higher than ideal (above 80 PSI), which can stress PEX connections and fixtures. A pressure regulating valve should be installed if the incoming pressure exceeds 80 PSI.

What to Include in Your Pre-Closing Plumbing Inspection

When you hire an independent plumber — separate from the builder's team — to inspect your new Argyle home, here's what the inspection should cover:

Water pressure and flow testing at every fixture. Turn on multiple fixtures simultaneously to check for pressure drops. Run the master shower while flushing a toilet on the same floor — you should maintain acceptable pressure at both.

Drain flow testing at every sink, tub, and shower. Fill each fixture and release the water to check drain speed. Slow drains in a new home indicate grading issues, partially blocked lines, or improper venting.

Water heater evaluation including the size relative to the home, the temperature setting (should be 120°F), the presence of an expansion tank (required by code in most situations), and proper venting for gas units.

Visual inspection of all accessible plumbing including under-sink connections, water supply lines to toilets, washing machine hookups, and the water heater connections. Look for signs of moisture, corrosion, or improperly secured pipes.

Outdoor plumbing check including hose bibs, irrigation connections, backflow preventers, and sewer cleanout access. Verify that outdoor faucets have freeze-proof (frost-free) sillcocks, which is critical for surviving North Texas freezes.

Sewer camera inspection of the main drain line from the house to the city connection. This reveals any issues with the sewer line that aren't visible from inside the home — offset joints, debris left in the line from construction, or improper connections to the city sewer main.

2025 Texas Plumbing Code Updates That Affect New Argyle Builds

Texas adopted updates to the plumbing code that went into effect for new construction permits. For Argyle homebuyers, the most relevant changes include updated requirements for water conservation fixtures, new sizing calculations for supply lines in larger homes, and expanded requirements for backflow prevention on irrigation systems.

If your home was permitted before the code update but completed afterward, it may have been built to the older code — which is legal, but means it might not include some of the newer requirements. An independent inspection can identify which code your home was built to and whether any updates would benefit you.

The Builder's Warranty vs. Independent Inspection

Most builders offer a one-year warranty on workmanship, which includes plumbing. Some issues — like a leaking PEX connection — may be covered for up to two years. Structural plumbing defects (sewer line issues, pipe failures) may be covered for up to ten years under the structural warranty.

Here's the catch: warranty claims require you to identify and report the problem within the warranty period. If a slow drain caused by improper grading goes unnoticed for 18 months, you may miss the one-year workmanship window. An independent plumbing inspection before closing — or within the first few months of ownership — creates a documented record of any issues that can support a warranty claim.

Partner with the Right Team for Your New Argyle Home

At Haltex Plumbing, we work with homeowners across Argyle and all of Denton County. Our team includes master plumbers with 30 years of combined experience who know exactly what to look for in new construction. We've earned a 4.9-star rating from 162+ reviews and are proud to be BBB A+ Accredited.

If you're building or buying a new home in Argyle and planning a kitchen or bathroom with premium finishes, our sister companies Stonemeyer Granite for countertops and The Design House for full design services can help you create the space you want — and we'll make sure the plumbing behind the walls is done right.

Buying a New Home in Argyle? Get a FREE Plumbing Inspection

Our master plumbers will inspect every fixture, connection, and drain line in your new build — at no cost to you. Same-day appointments available when you call before noon.

Call 940-999-7742