General Contractor in Washington Terrace, Utah

Section 17.48.030 of the Washington Terrace Municipal Code, reenacted by Ordinance 2026-04 on September 15, 2026, sets internal and detached ADU conditions that include these, in its own order.

• An ADU only on an eligible lot or parcel that is owner occupied, with the owner of record living in the primary dwelling or the ADU as the owner's sole principal and primary residence
• Every permit and license obtained first, including the required building permits and a business license, along with participation in the city's Good Landlord Program
• No ADU used as a short-term rental, meaning occupancy offered for fewer than 30 consecutive days, or as any similar transient accommodation
• A legally established detached single-family dwelling on the lot or parcel, conforming to its zone and occupied by the owner
• No more than one type of ADU, internal or detached, on a lot or parcel
• The ADU kept in the same owner's fee simple ownership as the primary dwelling, never separately subdivided, sold, conveyed, or assigned its own parcel identification number
• The ADU used only for residential purposes
• An internal ADU only as a permitted use within a primary dwelling in an eligible residential zone
• An internal ADU designed so that the primary dwelling keeps its appearance as a single-family dwelling
• At least one additional on-site parking space for an internal ADU, beyond the maximum the code requires for the primary residential unit and dedicated to the ADU's occupants
• Any garage or carport parking space converted into an internal ADU replaced as usable on-site parking
• No internal ADU created inside a mobile home
• No internal ADU in a zone covering 25 percent or less of the city's total area zoned primarily for residential use, except as Utah Code 10-21-303(3)(f) provides
• No internal ADU where the primary dwelling is served by a failing septic tank
• No internal ADU on a lot or parcel of 6,000 square feet or less
• Separate service laterals and meters for any ADU, where the city requires them
• A detached ADU as a permitted use on a lot or parcel with a primary dwelling in an eligible residential zone
• No detached ADU on a lot or parcel of less than 11,000 square feet
• A detached ADU subordinate and incidental to the primary dwelling
• Two on-site parking spaces assigned only to a detached ADU of 650 square feet or larger, or one for a smaller unit, with any garage or carport parking space converted into the unit replaced as usable on-site parking
• A detached ADU behind the primary dwelling and the front yard setback, meeting the zone's setbacks for an accessory building
• No detached ADU larger in gross floor area than the primary dwelling, on or within a public utility easement, another recorded easement, or irrigation facilities, or in the front-yard area, and none that lacks adequate access to a required utility service that is a project improvement, including sanitary sewer, culinary water, electrical, or storm water, or whose required system improvement lacks the capacity to serve it
• A design for any ADU consistent with the primary dwelling through generally compatible exterior materials, roof form, building proportions, or architectural design
• Conversion of a legally constructed eligible accessory structure into a detached ADU, processed administratively as a permitted use application
• A building permit application that includes, as applicable, engineered architectural drawings and building plans that meet code, proof of ownership, a site plan, utility documentation, evidence that the ADU was legally constructed, an affidavit of the occupied owner, a parking plan, and any required agency approvals
• No occupancy until the city issues final building approval or a certificate of occupancy, as applicable
• No ADU approval treated as permission to violate private covenants, conditions, restrictions, or development agreements
• Utility upgrades where the city requires them to provide adequate capacity, protect the system, or meet health and safety requirements
• An address or unit designation that the city approves and emergency service providers accept
• Notice to the city of any change in ownership or owner occupancy that may affect an ADU's eligibility
• Temporary absences for military service, medical care, or similar circumstances accepted for the occupied owner
• Loss of the ADU's eligibility, and grounds for suspending or revoking it, once owner occupancy of the lot or parcel lapses

Section 17.48.030 also holds a detached ADU to the zone's rules on size, height, and lot coverage. Section 17.44.090 lets accessory buildings in a residential zone cover no more than 25 percent of the rear yard. Section 17.44.120 caps a building accessory to a one-, two-, three-, or four-family dwelling at one story or 20 feet.

Utah's ADU statutes apply in Washington Terrace as well, as our ADU page explains.

Sources: Washington Terrace Municipal Code, Section 17.48.030; Ordinance 2026-04; Section 17.44.090; Section 17.44.120. During preconstruction, we measure your lot against the 11,000-square-foot minimum, confirm the setbacks and rear yard coverage for a detached ADU in Washington Terrace with the city, and ask whether the city will require separate service laterals and meters or a utility upgrade.