Property data, United States
Home Valuations (AVM)
An automated valuation model for every US home: the estimate, a confidence range and the comparable sales it rests on, as a file or a real-time API.
An automated valuation model, or AVM, estimates what a property would sell for today from data rather than from a visit. Ours produces an estimate, a low and high range, a confidence score and the list of comparable sales behind the number for every US residential property, so an analyst or a customer can see why the value is what it is.
The model is retrained on recorded transactions and current listings and is validated by holding out recent sales by metro, which means the reported error is measured against sales the model had not seen. Where we have permit and listing signal that other models lack, such as a recent roof replacement or a price cut on a live listing, the estimate reflects it.
Take it as a bulk file for portfolio marks, equity-based audiences and model features, or as a real-time API for a home-value feature, a lending pre-qualification flow or an insurance quote. The comparable sales endpoint returns the comps on their own for teams that want to build their own adjustment logic.
Sample rows
Illustrative and synthetic. Real samples for your geography are a reply away.
| property_id | address | estimate | low | high | confidence | as_of | comps_used | last_sale_price | last_sale_date |
|---|---|---|---|---|---|---|---|---|---|
| P0148••• | •••• W Oakwood Ave, Chicago IL | $9••,000 | $8••,000 | $9••,000 | 0.88 | 09/01/2026 | 6 | $8••,000 | 06/14/2018 |
| P5522••• | 2•• Vine St, Fresno CA | $4••,000 | $3••,000 | $4••,000 | 0.81 | 09/01/2026 | 8 | $3••,000 | 05/14/2021 |
Schema
| Field | Type | Notes |
|---|---|---|
| property_id | identifier | non-personal |
| address | text | personal data |
| estimate | currency | non-personal |
| low | currency | non-personal |
| high | currency | non-personal |
| confidence | number | non-personal |
| as_of | date | non-personal |
| comps_used | text | non-personal |
| last_sale_price | date | non-personal |
| last_sale_date | date | non-personal |
Abridged. The full data dictionary ships with every sample and lists every field, its fill rate and its source.
Used for
- Portfolio and collateral marks
- Home-value features in consumer products
- Equity-based marketing audiences
- Pre-qualification and quote flows
- Model features for underwriting and pricing
How it is built
Gradient-boosted models trained on transaction, assessor, listing and permit features, retrained weekly. Comparable sales are selected on distance, similarity and recency and are returned with the estimate. Validation holds out sales recorded after the training cutoff, by metro, and the resulting error distribution ships in the documentation.
Confidence reflects comp density and recency, the agreement between models and how unusual the property is for its area. Rural parcels, unique structures and recently changed properties score lower and the range widens accordingly.
Questions we get
What is an automated valuation model?
A statistical model that estimates a property's market value from recorded sales, property characteristics, listings and local market conditions, without a physical inspection. Lenders, insurers, investors and consumer sites use AVMs for scale; an appraisal is still required where regulation demands one.
How accurate is it compared to the large AVM providers?
Accuracy is a metro-by-metro question, and every provider's error is lower in dense suburban markets than in rural ones. We publish our holdout error by metro and will run a blind test on your portfolio, scored against your own subsequent sales, before you decide.
How much does an AVM cost versus an appraisal?
An appraisal is a per-property fee and days of turnaround. An AVM lookup is a fraction of that and returns in real time, which is why it is used for screening, marketing and monitoring, with appraisals reserved for the decisions that require them.
Do you offer a commercial AVM?
Not as a general model. Commercial value depends on income, and public record rarely carries it. We provide commercial comparable sales and assessor data and build income-based estimates on a scoped basis.
Can we get just the comparable sales?
Yes. The comparable sales endpoint returns the comps, their adjustments and distances without the estimate, for teams that want to apply their own logic.
Is there a free AVM lookup?
Not on this site. Evaluation keys with a request allowance are available so a team can test the API against its own addresses before licensing.