80 homes in Dallas, Collin County (appraisal neighborhood S1530), compared with their most similar neighbors.
We compared each of 80 single-family homes with its most similar neighbors (same neighborhood and quality, similar size and age). 26% have a house value above the median of those homes: together, $280,846 of house value above them. Texas lets you protest a value that is above the median of comparable homes.
We rate 0 "Yes" and 23 "Maybe". If every one of them protested and got the reduction their comparables support, their owners could pay about $5,314 less in property tax a year.
Of 80 Cobblestone Square homeowners in our data, 17 protested their 2026 value; 5 of 12 decided protests lowered it, typically by $3,222 (1.1% of the value).
The typical winning protest cut the value by 6% on your own vs. 1% with an agent.
On your own
$16,409
typical value cut among wins (6%)
With a paid agent
$2,717
typical value cut among wins (1%)
Source: the Collin Central Appraisal District, 2026 protests. Tax figures at a typical 2% effective tax rate. Agent or do it yourself? · Methodology
At a typical 2% tax rate, the typical win on your own takes about $322 a year off the tax bill, and you keep all of it. The typical agent win takes off about $53, and the agent keeps about $13–$21 of that. Filing is free, online or by mail, and there's no agent contract to renew or cancel each year.
Their house values were above the median of the most similar neighbors, the comparison Texas law allows a protest on, but their owners didn't protest in 2026.
Median change in appraised market value from last year.
Our estimate from 2026 published tax rates and each home's exemptions: 2% of market value.
Usually a rental or second home. If it's your own home, a homestead exemption takes $140,000 off its school taxable value and caps yearly increases in taxable value at 10%; you apply with your appraisal district (Form 50-114).
Free, in about 10 seconds: how your home compares with similar homes nearby.
| Single-family homes | 80 |
|---|---|
| Median market value | $263,314 |
| Median change from last year | -11.4% |
| Median value per sq ft | $231 |
| Median living area | 1,138 sq ft |
| Median year built | 1985 |
| Homes with a pool | 0% |
| Homestead exemption on file | 48% |
| Median estimated property tax | $4,458 a year |
| Median effective tax rate | 2% |
| Homes with a paid protest agent | 20% |
The protest deadline is May 15, or 30 days after your appraisal notice was mailed, whichever is later. Check the date on your notice. New to this? Read how to protest.
Have a specific Texas address? Check it at taxprotesting.com/check?address=1234 Main St, Plano, TX with your own street address, or use the search box.
Based on 2026 appraisal values and protest outcomes from the Collin Central Appraisal District. Estimates, not promises: every protest is decided on its own evidence.