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Data Glossary

Metric definitions

Reference

Data Glossary

Definitions, sources, and update cadence for every data point in OpenRoof. Data is refreshed monthly unless noted.

106 metricsSourcesCadence
Data trust center
Home Value5 metrics
Median Home Valuehome_value

The midpoint sale price for all single-family homes in the market, smoothed with a three-month rolling average to reduce seasonal noise.

Source: Zillow ZHVIUpdates: Monthly (mid-month)
Home Value YoY %home_value_yoy

Percentage change in median home value compared with the same month one year prior. Positive values indicate appreciation; negative values indicate depreciation.

Source: Zillow ZHVIUpdates: Monthly
Home Value MoM %home_value_mom

Month-over-month percentage change in median home value. Useful for tracking short-term momentum, though more volatile than YoY.

Source: Zillow ZHVIUpdates: Monthly
5-Year % Changehome_value_5yr

Total percentage appreciation or depreciation in median home value over the past 60 months. Shows long-term structural trends in a market.

Source: Zillow ZHVIUpdates: Monthly
% Change from Peakhome_value_since_peak

How far the current median home value sits above or below the local all-time high. Markets below peak may represent recovery opportunities; markets far above peak may indicate stretched valuations.

Source: Zillow ZHVIUpdates: Monthly
Rent3 metrics
Average Monthly Rentavg_rent

Mean observed monthly rent across all rental units in the market, including apartments, condos, and single-family homes.

Source: Zillow ZORIUpdates: Monthly (mid-month)
Rent YoY %avg_rent_yoy

Year-over-year percentage change in average rent. Rapid rent growth often precedes home price appreciation; rent declines can signal softening demand.

Source: Zillow ZORIUpdates: Monthly
Rent-to-Income Ratiorent_to_income

Average monthly rent divided by average monthly household income. Values above 30% signal affordability stress; values above 40% indicate severe cost burden.

Source: Zillow ZORI + Census ACSUpdates: Monthly rent / Annual census
Market Activity7 metrics
Active Listingsinventory

Total number of residential properties listed for sale and active on the market at end of month. Rising inventory gives buyers more choices and can soften price growth.

Source: Realtor.comUpdates: Monthly (1st week)
Inventory YoY %inventory_yoy

Year-over-year change in active listing count. A sharp drop signals tightening supply; a surge signals softening demand or sellers returning to market.

Source: Realtor.comUpdates: Monthly
Days on Market (DOM)days_on_market

Median number of days active listings spend on market before going under contract. Low DOM indicates high demand; rising DOM signals cooling buyer activity.

Source: Realtor.comUpdates: Monthly
DOM YoY Changedom_yoy

Days-on-market compared with the same month one year ago. Always measured year-over-year (not month-over-month) to eliminate seasonal patterns.

Source: Realtor.comUpdates: Monthly
Price Reduction %price_cuts_pct

Percentage of active listings that have had at least one price reduction. Markets above 25% are showing seller capitulation; markets below 10% are strongly seller-favored.

Source: Realtor.comUpdates: Monthly
New Listingsnew_listings

Count of newly listed properties added to the market during the month. Rising new listings can expand buyer choice; declining new listings can intensify competition.

Source: Realtor.comUpdates: Monthly
New Listings YoY %new_listings_yoy

Year-over-year change in new listing count, indicating whether sellers are increasingly willing (or unwilling) to put homes on the market.

Source: Realtor.comUpdates: Monthly
Valuation & AffordabilityPremium5 metrics
Valuation RatioPremiumvaluation_ratio

Median home value divided by (median household income × 5). Lower ratios indicate relatively affordable markets; higher ratios indicate stretched valuations relative to local income.

Source: Zillow ZHVI + Census ACSUpdates: Monthly
Overvalued %Premiumovervalued_pct

How much a market's valuation ratio exceeds (or falls below) the national average, expressed as a percentage. A value of +25% means homes are 25% more expensive relative to income than the national baseline.

Source: Calculated — Zillow + CensusUpdates: Monthly
Price-to-Rent RatioPremiumprice_to_rent_ratio

Median home value divided by annual rent. Lower ratios (< 15) favor buying; higher ratios (> 20) favor renting. Useful for investors evaluating buy-vs-rent decisions.

Source: Zillow ZHVI + ZORIUpdates: Monthly
Income-to-Value RatioPremiumincome_to_value

Annual median household income divided by median home value. Higher ratios mean locals can more easily afford local homes; lower ratios signal affordability stress.

Source: Census ACS + ZillowUpdates: Monthly
Affordability ScorePremiumaffordability_score

Composite 0–100 index weighting price-to-income, rent-to-income, and price-to-rent. A score of 100 represents the most affordable market in the dataset; 0 represents the least.

Source: Calculated — multi-sourceUpdates: Monthly
Demographics4 metrics
Populationpopulation

Total residential population of the market area. Used to contextualize absolute listing counts, inventory levels, and aggregate demand signals.

Source: U.S. Census ACSUpdates: Annual (Q4 release)
Population YoY %population_yoy

Year-over-year percentage change in population estimate. Markets with consistent inflows often sustain higher price appreciation due to structural demand growth.

Source: U.S. Census ACSUpdates: Annual
Median Household Incomemedian_income

Midpoint household income across all households in the market area, in current-year dollars. Core input for affordability and valuation calculations.

Source: U.S. Census ACSUpdates: Annual (Q4 release)
Income YoY %income_yoy

Year-over-year change in median household income. Markets where incomes grow faster than prices are gradually becoming more affordable.

Source: U.S. Census ACSUpdates: Annual
Forecast & ScorePremium3 metrics
Momentum ScorePremiumheat_score

Composite 0–100 market score weighing inventory (25%), days-on-market (20%), price reductions (20%), appreciation (20%), and mortgage rate adjustment (15%). Scores above 60 indicate appreciating markets; below 40 signal declining markets.

Source: Calculated — multi-sourceUpdates: Monthly
12-Month ForecastPremiumforecast_12mo

Predicted percentage change in home value over the next 12 months, based on current market dynamics, historical trends, and macro indicators. Provided as a directional signal, not a guarantee.

Source: OpenRoof modelUpdates: Monthly
Forecast DirectionPremiumforecast_direction

Simplified directional signal: Up, Flat, or Down — derived from the 12-month forecast. Useful for quickly screening markets without reading percentage values.

Source: OpenRoof modelUpdates: Monthly
All metrics are updated on a monthly basis unless otherwise noted. Source data may be revised by the originating agency; OpenRoof reflects the latest available values within 48 hours of source publication.
Data Glossary | OpenRoof