School quality is the most-cited factor in residential real estate decisions, and also one of the most misunderstood. Here's what the data actually measures, where it falls short, and how to use it well.
Why School Data Matters Even Without Kids
Even buyers who don't have children, and don't plan to, should pay attention to school district quality. The reason is straightforward: school quality is the dominant driver of single-family home prices in most American markets.
Multiple studies, including long-running research from Brookings and NBER, have found that moving from an average to a top-quartile school district is associated with home price premiums of 15 to 25%. That premium is built into the purchase price you pay, and it tends to hold, or grow, over time.
The Standard Metrics (and Their Limits)
Test Score Proficiency Rates
State standardized test results, typically reported as the percentage of students "proficient" or above in math and reading, are the most widely cited school quality metric. They're easy to find and easy to compare.
The problem: they largely reflect the economic status of a school's students, not the quality of instruction. Districts serving high-income families consistently score high; districts serving lower-income families consistently score lower. This has been replicated so reliably that proficiency rates alone tell you more about neighborhood demographics than about whether teachers are effective.
What to Look at Instead: Value-Added Metrics
A better question than "how high are the scores?" is "how much do students improve compared to where they started?" Value-added models (VAMs) attempt to measure exactly this: the academic growth a school produces beyond what's predicted by its student demographics.
Several states publish value-added or "growth" scores alongside raw proficiency data. A school with mediocre proficiency but high growth scores may actually be doing excellent instructional work. It just starts from a harder baseline. These are often the best buys: undervalued schools in improving neighborhoods.
Graduation Rates
Four-year cohort graduation rates are a more direct outcome measure. They're harder to game than test scores and speak directly to whether students are completing their education. Look for rates above 90%. Below 80% is a significant warning sign.
Per-Pupil Expenditure
Funding doesn't guarantee quality, but chronic underfunding does tend to erode it over time. Look at per-pupil spending relative to the state average. A district spending 30% below state average may be operating with facilities, teacher salaries, and programs that will struggle to attract and retain effective staff.
The District vs. School Distinction
District-level data averages across all schools. Within a district, quality can vary dramatically, sometimes by elementary school catchment area that spans just a few blocks. If schools are important to your decision, drill down to the specific assigned school for any address you're considering, not just the district average.
GreatSchools.org and the NCES Common Core of Data are useful for school-level lookups. State department of education websites often have the most current and granular data.
Charter and Private School Access
In some markets, the quality of the assigned public school matters less because there are strong alternatives available. Dense urban areas often have high-performing charter networks; some suburban areas have private school ecosystems within reasonable distance.
Factor in availability and cost realistically. A competitive charter lottery is not a guarantee. Private school tuition at $20 to 40K/year significantly affects the real cost of living in a lower-cost home.
Trends Matter as Much as Current State
A school district's current ratings matter less than its trajectory. A district that was rated 6/10 five years ago and is now 8/10 is a different investment than one rated 8/10 and declining.
Look for: enrollment trends (declining enrollment is a warning sign for funding and program offerings), demographic shifts, new administration or curriculum changes, and bond election history (community willingness to fund schools).
What the Data Can't Capture
Numbers don't capture culture. A school's test scores say nothing about whether it fosters curiosity, how it handles bullying, the quality of its arts or athletics programs, or whether teachers genuinely like being there.
If schools are a significant factor for your family, schedule tours. Talk to parents at pickup. Visit during school hours if you can. The data will tell you which schools are worth visiting. The visit will tell you whether it feels right.