Accessory Structures in Carlsbad, CA (2026)
4 verified accessory structures rules for Carlsbad, California, sourced directly from the municipal code and official government pages.
Verified from official government sources
ADU Rules
Carlsbad allows ADUs on any lot with an existing or proposed dwelling, capping detached units at 1,200 square feet and 16 to 18 feet in height, with a certified local coastal program overlay for coastal-zone properties.
Carlsbad Accessory Dwelling Unit Zoning Rules
Some RestrictionsCarlsbad, CA, Municipal Code § 21.10.030(D), (E)(3)(c), (E)(5)
ADUs shall be permitted in zones that allow one-family dwellings, two-family dwellings, multiple-family dwellings, and mixed-use... provided there is an existing or proposed dwelling on the lot where the ADU is proposed... Detached ADUs – 1,200 square feet. This limit applies to one-family dwelling lots... Roof decks shall not be permitted on detached or attached ADUs.
ADU Rental Restrictions
Carlsbad bars newer accessory dwelling units from short-term vacation rental use and caps rents on ADUs built to satisfy inclusionary housing requirements. An ADU or JADU permitted on or after January 1, 2020 cannot be booked as a vacation rental under Chapter 5.60.
Carlsbad ADU Rental Restrictions
Some RestrictionsCarlsbad, CA, Municipal Code § 5.60.020; § 21.85.070(B)
"Short-term vacation rental" is defined as the rental of any legally permitted dwelling unit... for occupancy for dwelling, lodging or sleeping purposes for a period of less than 30 consecutive calendar days... Accessory dwelling units and junior accessory dwelling units as defined in Chapter 21.04, Section 21.04.121, for which a building permit was issued on or after January 1, 2020, are not c...
Shed & Carport Rules
A detached shed, garage, or patio cover built in a Carlsbad R-T zone setback tops out at 440 square feet, one story, and 14 feet tall with a 3:12 roof pitch. Setbacks run 20 feet in front, 5 feet on the sides, rear, and alley, and a building permit is required regardless.
Carlsbad Accessory Building & Shed Standards
Some RestrictionsCarlsbad, CA, Municipal Code § 21.20.080
(D) Buildings shall not exceed one story. (E) Building height shall not exceed fourteen feet if a minimum roof pitch of 3:12 is provided or ten feet if less than a 3:12 roof pitch is provided. ... (3) Detached accessory structures, which are not dwelling units and contain no habitable space, including, but not limited to, garages, workshops, tool sheds, decks over thirty inches above grade, and...
Tiny Homes
Carlsbad enforces tiny houses under Appendix BB of the 2025 California Residential Code, adopted without local amendment by Municipal Code Section 18.20.010. Because the Residential Code only reaches detached one- and two-family dwellings, townhomes of three stories or less, and their accessory structures, a tiny house built under Appendix BB still needs a building permit and inspection like any other residential structure.
Carlsbad Tiny House Building Code Standard
Some RestrictionsCarlsbad, CA, Municipal Code § 18.20.010
A. The 2025 California Residential Code, California Code of Regulations, Title 24, a portion of the California Building Standards Code, is adopted and incorporated by this reference as the residential code except for changes, additions, deletions and amendments in this chapter. The following sections are deleted: Sections R103, R104, R107, R108, and R110 through R114 of Chapter 1. Only the foll...
Looking for San Diego County county-wide rules?
County ordinances apply to unincorporated areas and may supplement Carlsbad city rules.
Accessory Structures in San Diego County →