Every few months, a buyer under contract on one of Colleyville's larger lots hits the same wall during the inspection period. The survey shows a utility line that isn't a water line at all. It's a well casing. The septic tank sits somewhere behind the property, waiting for its own separate inspection that has nothing to do with the general home inspection the buyer already scheduled.
For someone moving from a typical suburban subdivision, this comes as a genuine surprise. Colleyville reads as one of the more affluent, established cities in the Mid-Cities corridor, the kind of place where you'd assume every address ties into city water and city sewer. On the city's larger parcels, that assumption is often wrong. Active land listings in Colleyville right now market private well water as a standard feature rather than a defect, and the pattern shows up on exactly the kind of parcel you'd expect: large, secluded, and far enough from the core that municipal lines never reached it. One 8.28-acre property with dual gated access off both John McCain Road and Pleasant Run Road is being sold on its seclusion and lake views, the type of remote acreage where well and septic tend to appear.
The reason this catches buyers off guard is the same reason the median price they saw on a portal before they ever toured a house is a reasonable starting point and a poor place to stop.
The Median Is Real. It Just Isn't Describing One Market
Pull three widely used sources for Colleyville in 2026 and you get three different stories. Over the three months ending in May, one tracker put the median sale price at $1.0 million, up 11 percent from the same stretch a year earlier, with price per square foot at $294, up nearly 7 percent, and homes selling in a median of 24 days versus 30 days the year before. A separate index, updated at the end of May, placed the typical home value at $925,491, up only 1.6 percent for the year. By mid to late summer, a third source had the trailing 30-day median at $960,000, down 6.5 percent year over year, even while price per square foot on that same snapshot rose 2 percent.
None of these numbers are wrong. They're measuring a market that doesn't sell in volume. Colleyville isn't a phase-driven builder market where a few hundred closings a month smooth out the noise. It's a market where price movement gets driven by a small number of high-end transactions rather than a broad shift across every price tier. When only a handful of estate-lot sales close in a given month, one large luxury closing or one smaller entry-tier sale can pull the median several percentage points in either direction, with no change at all in how the broader city is actually trading.
That volatility isn't a data quality problem. It's the same lot-scarcity story showing up in the price feed. The number swings because the product being sold in Colleyville isn't a standard unit. It's a limited run of large, wooded, increasingly hard-to-replace parcels, and the mix of which parcels happen to close in any given month changes the average more than any change in underlying demand does.
Square Footage Stopped Being the Story
Once you accept that the lot is the product, price per square foot loses most of its usefulness as a comparison tool. Two homes of similar size in Colleyville can carry very different price tags depending on tree cover, privacy, and how much land sits around the structure. That's the actual variable buyers are pricing when they compare listings here, not finish quality or square footage alone.
The concentration of that premium isn't spread evenly across the city. It clusters in established custom-home neighborhoods with mature trees and larger lots: Whittier Heights, Montclair Parc, Woodland Hills, and Somerset. Homes in Timarron and Pembrooke, generally in the $700,000 to $1.2 million range, draw steady buyer interest without the scarcity pricing of the true estate tier. At the top end, properties in Riviera Estates and along Bill Simmons Road carry the highest price points and the smallest buyer pools, which means they routinely sit on the market longer than the citywide averages above would suggest, even when they're priced correctly.
New construction has started responding to the same scarcity rather than fighting it. Rather than building larger subdivisions, recent projects have gone small and exclusive: Holt Farms and Park Hill are custom micro-subdivisions bringing new multimillion-dollar sites to a city with little available land left to develop. Oak Alley Estates takes that logic to its extreme, offering just 34 lots across 43 acres. These aren't volume plays. They're an acknowledgment that in Colleyville, the scarce resource is the dirt, not the square footage sitting on top of it.
What the Flyer Doesn't Say About Utilities
That scarcity is also why the well and septic question keeps surfacing on the larger parcels rather than in the older, tighter subdivisions closer to the city's core, where full municipal hookups are standard. The biggest, most private lots, the ones that command the steepest per-acre premiums, are more likely to sit far enough from existing infrastructure that private well and septic were the original, and sometimes only, option.
For a buyer, that reality adds a step to due diligence that a typical subdivision purchase never requires. A septic system needs its own inspection, separate from the general home inspection. Well water needs to be tested on its own timeline. Buyers considering any of Colleyville's larger acreage listings should ask about utility setup, maintenance history, and ongoing costs before they get attached to a lot, not after the option period is already ticking. It's a five-minute question at the showing that can save a week of scrambling during inspection.
Where Colleyville Sits Once You Zoom Out
Buyers comparing Colleyville against Southlake or Westlake are often comparing more than price. In the same period Colleyville's median sat around $1.0 million, Westlake's median ran roughly five times higher, with homes there taking closer to 80 days to sell and typically closing around 7 percent under asking. That gap says less about square footage or finish level than it does about liquidity. Colleyville sits in a middle ground: genuinely expensive by national standards, but far more reachable and far faster moving than the ultra-luxury tier one city over.
For someone deciding between the two, the real question isn't which city has the better median. It's how much of what they're buying is land versus how much is speed of transaction. Colleyville offers both a lot-driven premium and a market that still moves in a matter of weeks rather than months. That combination is rarer than the headline numbers make it look.
A Few Questions Worth Asking Before You Offer
Does every large lot in Colleyville run on well and septic? No. Older, established subdivisions closer to the city center generally tie into full city water and sewer. The private well and septic setups tend to show up on the larger, more remote acreage parcels and the newer custom micro-subdivisions built on land that sat outside existing infrastructure.
Should I anchor my offer to the citywide median price? Treat it as context, not a target. Given how few high-end transactions move the number each month, the citywide median can shift by tens of thousands of dollars from one data source's snapshot to the next. A comparison built from recent sales on similar lot sizes in the same neighborhood will tell you far more than the citywide figure will.
If you're comparing Colleyville against neighboring cities, or trying to figure out what a specific lot's utility setup means for your timeline and budget, that's the kind of detail worth working through with someone who tracks it property by property rather than headline by headline. Hacker Property Group works this market daily, from the established estate streets to the newest micro-subdivisions, and can walk you through exactly what a given lot is going to ask of you before you're under contract on it.
