Total basement area
Measures the total square feet of a property's basement, including both finished and unfinished areas. Known or imputed for 18.7 million addresses — 15.8% of the addresses Faraday knows.
At a glance
- Coverage today
- 15.8%
- Typical coverage
- 15.3%
- Addresses with a value
- 18.7M
- Median
- 1,016 square feet
- Most values come
- from the address
- Latest collection
- May 1, 2026
Distribution
n = 18,722,380Share of addresses with a known value in each band. The middle 50% falls between 723 and 1,357 square feet, shaded darkest.
P10 means 10% of addresses have a value at or below this one, and P90 means 90% do. P25 and P75 bound the middle half. The median is the middle: half are below it, half above.
Median over time
1,008 square feet1,005 square feet → 1,008 square feet across 12 collections, shaded between P25 and P75. Estimated from a 1% sample of addresses.
Coverage
Latest collection: 98,683,954 addressesCoverage by state
Percentage of addresses in each state with a value.
Coverage over time
15.8% todayShare of addresses holding a value at each monthly snapshot. A value carries forward for one year.
How we arrive at a value
Whether a value was observed on the person themselves, carried from their address, or estimated from the people around them.
- On the person — 0%
- Not used for this attribute — no value is inherited this way.
- From address — 100%
- Carried from what we know about the household at their address.
- From geography — 0%
- Not used for this attribute — no value is inherited this way.
Coverage, in context
Where 15.8% sits on the catalog’s own coverage range.
Higher coverage than 33% of address-level attributes in the catalog
Freshness
How recently this was collected, and how often a new collection arrives. Each bar is the number of addresses in that collection. Gaps are real — collection is periodic, not continuous.
Change between collections
The share of addresses whose value is different from the previous collection.
of addresses changed value between the two most recent collections — 149.7× steadier than the catalog median of 13.5%.
Contribution ledger
17 ingestions
1 authority contributed since Jul 2023.
| Observed | Ingested | Count | ID |
|---|---|---|---|
| 2026-05-01 | 2026-07-01 | 125,639,012 | f9d55800… |
| 2026-04-01 | 2026-07-01 | 121,548,788 | 178f88a6… |
| 2026-03-01 | 2026-07-01 | 72,154,489 | a1e715b0… |
| 2026-02-01 | 2026-07-01 | 121,865,620 | b70b01b3… |
| 2026-01-01 | 2026-07-01 | 120,035,058 | 2786571a… |
Technical details
- API name
- total_basement_area
- Category
- fig/property
- Type · unit
- Integer · square feet
- Statistical type
- ratio
- Allowed values
- null
- Derivations
- Unspecified
- Directionality
- Higher number means larger area.
- Deprecation
- false
In a payload
{
"attributes": {
"total_basement_area": 1016
}
}