ADU rules in Pasadena

Pasadena has no zoning, so no ordinance authorizes or prohibits a detached second dwelling; the code never mentions accessory dwelling units and contains no citywide one-dwelling-per-lot rule. What actually decides the question on a given lot is the private deed restrictions recorded with the Harris County Clerk: most Pasadena subdivisions carry them, the city's law department is authorized to sue to enforce them, and the housing code defers to them for any multifamily conversion. On a lot whose restrictions allow it, a detached second dwelling proceeds as ordinary permitted construction under the 2024 IRC with 25 ft front and 5 ft side/rear setbacks, plus planning site plan review because a two-dwelling lot is no longer single-family residential as defined.

An attached second unit makes the building what the code calls a duplex, a building type Pasadena's ordinances expressly recognize (the setback article defines duplex residential buildings, the adopted residential code covers one- and two-family dwellings, and the parking table has a two-family category). No use-district rule forbids it, but the housing chapter says nothing in the code permits establishing or converting a multifamily dwelling in a residential addition except where the deed restrictions permit, and 2021 replat rules lock in single-family plat restrictions. Pull the subdivision's recorded covenants from the Harris County Clerk before designing a conversion.

Because Pasadena has no zoning ordinance there is no maximum square footage, height, or lot coverage rule written for second dwellings; the size lines that exist are procedural. Deed restrictions commonly cap the size, type, and number of buildings, and the city treats those private limits as enforceable in court. If a project were reviewed as multifamily, a 0.40 floor area ratio and 45 percent building mass coverage limit would apply.

A full-text review of the entire Code of Ordinances (all chapters downloaded and searched) found no owner-occupancy condition attached to any dwelling, rental, or permit; with no zoning there is no ADU permit to hang such a condition on. The only owner-occupancy concepts in the code are homestead trade-permit exemptions and senior homestead tax exemptions. Deed restrictions in a particular subdivision could still impose occupancy or leasing conditions, and the city defers to and can enforce those.

Pasadena's minimum parking requirements are Exhibit A to Ordinance 95-86, adopted by §9-7 and published as a Planning Department PDF rather than codified text, so Municode alone will not show the numbers. No building permit or certificate of occupancy may be issued below these minimums; variances need building official plus city council approval.

With no zoning there is no conditional use permit, special exception, or public hearing for a residential project; city approvals are administrative. Every new dwelling needs a building permit under the 2024 IRC (in effect since February 2, 2026), and work that is not single-family residential as defined, which includes adding a second dwelling and any accessory structure over 1,200 sq ft, first needs planning department site plan approval on a legally platted lot; the building official cannot issue the permit until the planning director approves. The real gatekeeper is any recorded deed restriction, which is private but city-enforceable.

Nothing caps rental duration or requires an STR permit, but the hotel definition is broad enough to reach houses and rooming houses, so a short-stay host should expect local hotel-tax exposure on top of state tax. The multiunit-complex occupancy-license definition (two or more dwellings, common ownership, same lot) can sweep in a house plus a rented second unit, though the code does not spell out how it applies to a single accessory rental; confirm with the Permit Division.