Single-family homes in Carroll ISD closed at a median of $1,365,000 over the 12 months ending October 31, 2026, while neighboring Northwest ISD homes in Trophy Club closed at a median of $822,500 and in Roanoke at $585,000, according to NTREIS data pulled November 7, 2026. That gap is real, but the school line is only one of several reasons for it, and the data shows why sellers should price against their own side of the line rather than the district headline.
The Agency Dallas, an independently owned and operated brokerage serving North Texas, looked at every single-family closing in both districts across Southlake, Westlake, Trophy Club and Roanoke to see how much the district appears to move price, and where other factors do more of the work.
What do homes sell for on each side of the line?
Here are the medians for single-family homes that closed between November 1, 2025 and October 31, 2026:
- Carroll ISD, all addresses: 417 closings, median $1,365,000, about $350 per square foot, median home 3,929 square feet.
- Carroll ISD in Southlake: 344 closings, median $1,400,000, about $363 per square foot, median lot 0.46 acres, 13 median days on market.
- Carroll ISD in Westlake: 13 closings, median $3,530,000, about $686 per square foot.
- Northwest ISD in Trophy Club: 196 closings, median $822,500, about $251 per square foot, median lot 0.25 acres, 18.5 median days on market.
- Northwest ISD in Roanoke: 127 closings, median $585,000, about $217 per square foot, 42 median days on market.
- Northwest ISD in Southlake: 6 closings, median $1,983,750, about $389 per square foot, median lot about 1 acre.
In the same period, no single-family homes in Westlake that listed Northwest ISD closed through the MLS.
Do schools explain the whole price gap?
No. Comparing Carroll ISD in Southlake with Northwest ISD in Trophy Club, the median price per square foot differs by about $112. Part of that likely reflects district demand, but the two groups also differ on lot size, home size, age, city services and tax structure. The median Southlake Carroll home sat on almost twice the land of the median Trophy Club home.
The small group of Northwest ISD homes inside Southlake city limits is telling. Those six sales closed at a higher median price per square foot than Carroll ISD homes in Southlake, mostly because they sat on lots of about an acre. With only six sales the sample is too small for firm conclusions, but it shows that land and location within the city can outweigh the district on a given street.
What actually moves price across a district line?
When we price homes near a boundary, these are the factors we weigh, roughly in order of impact:
- Lot size and usable land. Larger lots consistently pushed price per square foot higher in this data.
- City and its services. Southlake, Westlake, Trophy Club and Roanoke differ in retail access, parks, tax rates and development patterns.
- Assigned campuses. Buyers often care about the specific elementary, middle and high school, not just the district name.
- Home age and condition. Updated homes compete differently from originals, on either side.
- Commute and access. Proximity to SH 114, SH 170 and DFW Airport shapes buyer demand.
How should a seller near the boundary price their home?
The Agency Dallas recommends sellers near a district line price against closed sales that share their district, their city and a similar lot size. Pulling comps from the other side of the line, or from the district median, can mislead in both directions.
- If your home is on the Carroll side but on a smaller lot, the Southlake Carroll median of $1,400,000 may overstate your value.
- If your home is on the Northwest side but on a large lot inside Southlake, the Trophy Club median may understate it.
- Confirm the assigned campuses for your exact address with the district and include them in your listing, since buyers check.
- Expect a different pace. Southlake Carroll homes went under contract in a median of 13 days, while Roanoke homes took a median of 42.
Our post on how school enrollment works in Carroll ISD and Westlake Academy explains enrollment details buyers ask about, and Southlake vs Westlake compares the two cities more broadly.
What should buyers check before paying a district premium?
Buyers deciding whether to stretch for a Carroll ISD address should confirm a few things first:
- The exact campus assignment for the address, verified with the district, not just the listing.
- Total property tax rate, including city, county and school district.
- Whether the district has announced campus changes, such as closures or boundary adjustments.
- Resale history on the street, since some blocks sell faster than the district median suggests.
For neighborhood-level context, see our Southlake and Westlake page. Buyers who start in Trophy Club or Roanoke for value and later move into Carroll ISD should also plan around timing, since most families prefer to move between school years.
How can The Agency Dallas help?
The Agency Dallas, an independently owned and operated brokerage serving North Texas, builds valuations for homes near district lines from same-district, same-city comparables. If you are weighing a sale in Southlake, Westlake, Trophy Club or Roanoke, request a free home valuation and we will show you which closed sales truly compare to your address.
Frequently asked questions
What is the median home price in Carroll ISD?
Single-family homes in Carroll ISD closed at a median of $1,365,000 across 417 sales between November 1, 2025 and October 31, 2026, based on NTREIS data. Within Southlake specifically, 344 Carroll ISD homes closed at a median of $1,400,000, or about $363 per square foot.
Are Northwest ISD homes cheaper than Carroll ISD homes?
Generally yes in this area. Northwest ISD homes in Trophy Club closed at a median of $822,500 and in Roanoke at $585,000 over the past year. Those homes also tend to sit on smaller lots and differ in age and size, so the price gap reflects more than the school district alone.
Are there Northwest ISD homes in Southlake?
Yes, a small number. Six single-family homes in Southlake that listed Northwest ISD closed in the past year at a median of $1,983,750, mostly on lots of about an acre. The sample is small, so sellers on that side should price against the closest matching land and home size comparables.
How fast do homes sell in Carroll ISD compared with Northwest ISD?
Carroll ISD homes in Southlake went under contract in a median of 13 days over the past year. Northwest ISD homes took a median of 18.5 days in Trophy Club and 42 days in Roanoke. Pace depends heavily on pricing, condition and lot size, not only the district.
How do I confirm which school district my address is in?
Use the district's own address lookup or call its enrollment office, and confirm the specific elementary, middle and high school. Listing data and third-party maps can be out of date, and boundaries do not always follow city limits. Buyers and sellers near a boundary should verify before pricing or making an offer.
Sources: NTREIS Matrix closed single-family sales, Carroll ISD and Northwest ISD, Southlake, Westlake, Trophy Club and Roanoke, closed November 1, 2025 to October 31, 2026, retrieved November 7, 2026. Medians calculated by The Agency Dallas.
