The Housing Unit Inventory (HUI) is a derivative dataset that, per UCA 63A-16-S506(4) , opens in a new tab , adds additional housing characteristics to the County Assessors' tax parcel data for Utah's most urban counties. It is not a substitute for the excellent datasets maintained by the Assessors but instead presents additional, standardized information about the type and number of housing units, associated grounds and common areas, and related short-term and long-term trends. The HUI is a best-effort product of a resource-limited analysis — users are encouraged to do their own quality assessment, share their findings, and cite this metadata describing how the HUI was produced.

WFRC, MAG, and UGRC are creating this dataset from the Land Information Record (LIR) parcel datasets published by UGRC. The LIR datasets are made possible by the county assessors voluntary sharing their annual tax assessment data. The tax roll data are frozen as of midnight Jan 1st for the specified year, finalized in late May, and typically loaded into the SGID later that summer.

WFRC, the metropolitan planning organization for the urban portions of Salt Lake County, Davis County, and Weber county, prepared the initial 2020 Housing Inventory dataset for their counties and defined the inventory process laid out below. MAG will be providing data for their counties, and UGRC is working with other counties to create inventories as requested.

• The inventory applies apartment unit counts to multi-family rental properties that do not have individually-owned and platted units (traditional apartment buildings, quadplexes, triplexes, mixed use buildings etc). These unit counts come from the address point data layer, with some counts being assigned manually using information from recent aerial photography and other sources.
• For cases where individual condos, townhomes, and single family homes have associated common areas, the inventory aggregates and combines the geometries and attributes of the individual units and common areas into a single composite parcel feature called an "owned unit grouping". This sums, averages, and counts the appropriate attributes of the contributing parcels to better characterize the density of these residential land uses (dwelling units per acre or DUA).
• Every county uses a slightly different set of designations when defining residential parcel types. The inventory attempts to standardize all the different classifications into the following categories:
• Townhouse
• Condo
• Apartment
• Single family
• Single family with Accessory Dwelling Units (ADUs, currently only for Salt Lake County)
• Duplex
• Mixed use (commercial and residential)
• Mobile home
• Pud (mixed)
• Group quarters
• The inventory doesn't include the following types of residential properties:
• Nursing, rehabilitation, or assisted living centers
• Extended stay hotels
• Incarceration facilities
• Student housing or dormitories
• ADUs outside Salt Lake County

The inventory uses the following fields to provide data on each parcel or owned unit grouping:

TYPE

General housing type, single- or multi-family

SUBTYPE

More detailed housing type classification

IS_OUG

1 or Yes for features that are owned unit groupings (as opposed to a single-parcel home or apartment)

UNIT_COUNT

The number of dwelling units, based on address point data

DUA

Density in dwelling units per acre

ACRES

Total acreage

TOT_BD_FT2

Total building(s) square footage

TOT_VALUE

Total market value

APX_BLT_YR

Approximate year built

BLT_DECADE

The decade the structure(s) were built

CITY

The features' city based on the SGID's municipal boundaries data

COUNTY

The features' county

SUBCOUNTY

If provided in the analysis, this groups the features into predefined areas for later grouping and analysis