Property foundation type
Foundation type supporting the primary building (e.g., slab, crawl space, basement, pier-and-beam). Known or imputed for 27.5 million addresses — 23.2% of the addresses Faraday knows.
At a glance
- Coverage today
- 23.2%
- Typical coverage
- 23.5%
- Addresses with a value
- 27.5M
- Share in largest category
- 32.0%
- Most values come
- from the address
- Latest collection
- May 1, 2026
How the categories split
n = 27,501,311Share of addresses in each category. 29 categories, of which the 20 largest are shown, with 32.0% in the largest.
Every category
29 categoriesThe chart above draws the 20 largest. Search here for one it does not.
- Slab31.95%8,787,103 addresses
- Concrete22.62%6,220,206 addresses
- Continuous footing9.62%2,646,599 addresses
- Concrete block8.50%2,338,689 addresses
- Pier6.61%1,819,116 addresses
- Brick2.96%815,128 addresses
- Masonry2.93%806,001 addresses
- Continuous wall2.88%790,795 addresses
- Block2.83%779,659 addresses
- Type unknown with crawlspace1.83%503,580 addresses
- Wood1.44%394,900 addresses
- Stem wall1.34%367,913 addresses
- Raised w and crawlspace1.02%279,576 addresses
- Stone0.91%249,753 addresses
- Standard0.61%168,678 addresses
- Type unknown with basement0.59%161,984 addresses
- Dirt and earth0.24%66,232 addresses
- Spread footing0.22%61,030 addresses
- Type unknown with part basemen0.21%58,381 addresses
- Concrete and beam0.20%53,912 addresses
- Raised0.14%38,904 addresses
- Pilings0.13%35,786 addresses
- Cross bridged and walls0.11%31,210 addresses
- Raised w and basement0.08%23,010 addresses
- Grade-beam0.01%1,745 addresses
- Mud sill0.00%960 addresses
- Steel0.00%214 addresses
- Pipe and iron0.00%213 addresses
- Pre-fab0.00%34 addresses
Category shares over time
Slab32.0% (largest)The 5 largest categories, each followed across 12 collections. 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
23.2% 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 23.2% sits on the catalog’s own coverage range.
Higher coverage than 38% 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 category changed.
of addresses changed value between the two most recent collections — 420.9× 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
- property_foundation_type
- Category
- fig/property
- Type · unit
- Text
- Statistical type
- nominal
- Allowed values
- null
- Derivations
- Unspecified
- Directionality
- null
- Deprecation
- false
In a payload
{
"attributes": {
"property_foundation_type": "Slab"
}
}