Accessory Structures in Tigard, OR (2026)
5 verified accessory structures rules for Tigard, Oregon, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
In the City of Tigard, Oregon, a lot with small form residential development can add one detached accessory dwelling unit of up to 800 square feet and 25 feet in height. The unit cannot sit closer to the front property line than the primary dwelling, and the code adds no off-street parking requirement for it.
Tigard OR Detached ADU Rules: 800 Sq Ft, 25 Ft
Some RestrictionsTigard Municipal Code § 18.220.040
A. Unit count. A maximum of one detached accessory dwelling unit is allowed per lot. The total maximum number of dwelling units on a small form residential lot is three, including the units in the small form residential development. Detached accessory dwelling units are prohibited on lots with three small form residential dwelling units. B. Size. The maximum size of a detached accessory dwellin...
ADU Impact Fees
In the City of Tigard, Oregon, an accessory dwelling unit of 1,000 square feet or less that complies with TMC 3.24.180 is exempt from city transportation and park system development charges, and ADUs of that size are exempt from the construction excise tax. Both exemptions are repealed July 31, 2027.
Tigard ADU Impact Fee and CET Exemptions
Light RestrictionsTigard Municipal Code §§ 3.24.100(F), 3.90.050(A)(2)
§ 3.24.100. Exemptions. The following types of development are exempt from payment of SDCs: ... F. Accessory dwelling units of 1,000 square feet or less that comply with TMC 3.24.180, from city transportation and park SDCs only. ... § 3.90.050. Exemptions. ... A. Notwithstanding TMC 3.90.030, the following are exempt from payment of the CET: ... 2. Accessory dwelling units of 1,000 square feet ...
ADU Rental Restrictions
In the City of Tigard, Oregon, an ADU that receives the SDC exemption cannot be used as a short-term rental for 10 years after final inspection approval. A restrictive covenant must be recorded and submitted to the city before the building permit is issued.
Tigard ADU Short-Term Rental Ban Covenant
Some RestrictionsTigard Municipal Code § 3.24.180
§ 3.24.180. Exemption for Accessory Dwelling Units. A. An ADU receiving an exemption pursuant to TMC 3.24.100.F may not be used as a short-term rental for a period of 10 years following approval of final inspection of the building permit for the ADU. A restrictive covenant must be recorded and submitted to the city prior to building permit issuance. B. TMC 3.24.100.F is repealed on July 31, 202...
Shed & Carport Rules
In the City of Tigard, Oregon, an accessory structure on a small form residential lot is limited to 528 square feet on lots under 2.5 acres and 1,000 square feet on lots of 2.5 acres or more, 15 feet in height, with no placement in the front setback and a 5 foot minimum from other lot lines.
Tigard OR Shed and Accessory Structure Rules
Some RestrictionsTigard Municipal Code § 18.290.050
Accessory structures are allowed on all lots with small form residential development subject to the following standards: A. The maximum size of accessory structures is 528 square feet on lots less than 2.5 acres and 1,000 square feet on lots 2.5 acres or larger; B. The maximum height of accessory structures is 15 feet; C. Accessory structures may not cause the lot to exceed the maximum lot cove...
Garage Conversions
In the City of Tigard, Oregon, a detached garage can be turned into a detached accessory dwelling unit, but the 800 square foot cap applies to the entire structure, including any part that stays a garage. A unit built above a garage must keep the combined height within the ADU maximum.
Tigard OR Detached Garage to ADU Conversion Rules
Some RestrictionsTigard Municipal Code §§ 18.220.010, 18.220.040(G)
C. They may be newly constructed or converted from existing dwelling spaces or accessory structures; ... E. The units require no additional off-street parking. ... G. Accessory structure additions and conversions. Detached accessory dwelling units may be added to or created from existing accessory structures such as detached garages. The maximum square footage requirements for the accessory dwe...
Looking for Washington County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Tigard city rules.
Accessory Structures in Washington County →