Permission is not production. Albuquerque opened the door to casitas and kept them small enough for older pipes and alleys. The units do not pencil, because an appraiser cannot give an accessory building the land value it does not own.

In 2023 the City changed the Integrated Development Ordinance so a casita is allowed by right on most residential lots, including R-1 neighborhoods long limited to one house. The stated aim was gentle density: a place for a parent, a caregiver, or a renter, without rewriting the street.

The permission was tempered on purpose. One casita per lot. It must sit behind the main house. It cannot cover more than 25 percent of the side and rear yard combined, and it cannot exceed 750 square feet (650 in the Downtown Neighborhood Area). The 2026 IDO update left those limits in place.

That cap protects the infrastructure. It also locks in the appraisal problem.

An ADU is not a house with its own land under it. It is an accessory improvement on an existing lot. Under standard residential appraisal practice, contributory value is what the market pays for the added structure, not what it cost to build. Land value stays with the primary residence. A one-off custom casita lacks economies of scale, and separate utility taps can run deep into five figures. A unit that costs $100,000 to $200,000 commonly supports a contributory adjustment far below that. The owner is upside down before the first tenant moves in.

Lenders read the same report. Because the casita cannot be pledged on its own, conventional construction financing is rarely available. The City’s own guidance points owners to a cash-out refinance or a home-equity loan on the main house. That restricts building to households with equity and spare cash. Zoning made casitas legal. It did not make them financeable.

Two changes would close the gap.

The broader fix is an ADU-to-condo conversion. Washington already requires its cities to allow a house and an ADU to be placed in a condominium and sold separately. California’s AB 1033 permits the same path, but only in cities that opt in. Albuquerque could authorize the conversion in the IDO. The New Mexico Condominium Act already lets an owner record a two-unit declaration. What is missing is the City’s confirmation that a casita mapped as a condominium complies with zoning density. With that confirmation, and with the casita ideally opening to the alley, the land stays intact as a common element shared by both units. That is easier on an existing mortgage than a lot split, provided the lender consents. The casita gets its own legal interest, its own tax parcel, and its own collateral. Appraisers could then value it as a dwelling, not as a backyard amenity, and a buyer could finance it as a starter home.

Where the lot already has alley access and the zoning allows it, a front-and-back lot split is the cleaner version of the same idea. Within a quarter-mile of a Main Street or Premium Transit corridor, the Albuquerque IDO already allows townhouse-scale lots. A minor plat that creates a fee-simple rear parcel gives the new unit its own land value. That is the difference between an accessory discount and a saleable house. It will not fit every R-1 lot, and it should not be forced onto streets with no rear access.

Either path would benefit from cheaper construction: crane-set or factory units instead of one-off custom builds, and published caps on tap and connection fees so a homeowner is not surprised by a five-figure utility bill.

Zoning opened the door, financing did not. If they are built under current zoning, they will be rentals. Given a separate title, by condominium or by a rear lot split, they can be more easily financed and a modest supply of entry-level housing.