Aascent.PRICING STUDIO · MARYLAND All of Ascent
MARYLAND SDAT/MDP PUBLIC RECORDS

Price a real Maryland home.
See the sales behind the price.

Search single-family homes and townhouses in Montgomery and Prince George’s counties. Prices use size, quality grade, location and sale timing only. Bedrooms and bathrooms are unavailable.

Real public recordsMaryland SDAT/MDP data, public domain
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  • Covered: single-unit homes and townhouses in Montgomery and Prince George’s counties with a usable state address, priced from private arm's-length improved transfers in Maryland state records.
  • Measured: with the Maryland-tested settings, the median error was 9.5% on 2,812 held-out sales. 8 of 9 accuracy criteria met — did not meet the acceptance criteria. Editing a setting leaves that measured configuration. The displayed price range is an uncalibrated comparable envelope.
  • Not covered: condominiums, multi-unit buildings, other Maryland counties and Virginia, MLS listing history, concessions and interior condition.

Virginia awaits written permission. Want to practise first? Open the fictional sample instead.

Maryland accuracy — results and misses

9.5%median error on 2,812 unseen Montgomery & Prince George’s, MD (revised) sales95% CI 9.0%–10.0%
52.0%within ±10% of the recorded price79.3% within ±20%
80.2%of test sales inside the calibrated 80% intervalthe raw comparable envelope held 70.7%
0.8 ptslower median error than median $/sqft of the same sales7.8 pts better than a trailing ZIP median

Pre-registered criteria · Montgomery & Prince George’s, MD (revised)

8 of 9 met
  • Met: Holdout sales valued94.13% target ≥ 90%
  • Met: Median absolute percentage error9.52% target ≤ 10%
  • Met: Share within ±10% of sale price51.98% target ≥ 50%
  • Met: Coefficient of dispersion (COD)14.8 target ≤ 15
  • Not met: Price-related differential (PRD)1.042 target 0.98–1.03
  • Met: Absolute median signed error1.30% target ≤ 3%
  • Met: Beats median $/sqft of the same comparables-0.31 pts target 95% upper bound below 0
  • Met: Beats trailing ZIP median price-6.97 pts target 95% upper bound below 0
  • Met: Calibrated 80% interval coverage80.17% target 75%–85%

These figures use the Montgomery & Prince George’s, MD (revised)-calibrated settings, which could value 94.1% of the holdout sales. With Ascent's general default settings, the median error on the same sales was 10.2%.

Revised experiment: consideration at least $50,000, no bedroom or bathroom inputs, construction quality adjustment capped at $75,000. Three previously unscored months, July–September 2026, with recording lag. Price-related bias still failed. This is a different cohort from the original 13.85% result; it is not a paired improvement estimate. The original failure remains published. Read both experiments. No calibrated range is released.

Maryland SDAT/MDP recorded sales of at least $50,000 (Public Domain public records). Rates were fitted on Jan 2022–Dec 2024, search filters chosen on Jan 2025–Sep 2025, the interval calibrated on Oct 2025–Jun 2026, then Jul 2026–Sep 2026 was scored once. Thresholds were fixed before scoring and have not moved. Report sha256-1c420bbcfa82… can be re-run with npm run validate:valuation -- --verify.

Also published: King County, WA, Jan 2015–May 2015, 10.6% median error on 6,975 sales, 5 of 9 criteria met. Results do not transfer between markets.