Long Beach ADU cost and permits in 2026: the field guide

Long Beach Development Services handles local ADU applications. Total permit, plan-check and connection fees depend on project scope and utility hookups; confirm the current fee schedule on the Long Beach Development Services ADU page and check the Long Beach city page for planning context. This guide identifies cost drivers and questions to resolve before comparing proposals.

Cost drivers across project types

• —Garage conversion (400 sq ft) — cost is driven mainly by existing slab and framing condition, panel capacity, and finish level; get itemized bids from a CSLB-licensed contractor.
• —Detached studio (480 sq ft) — driven by foundation type, utility-run distance to the panel and sewer lateral, and finish level.
• —Detached 1-BR (750 sq ft) — driven by scope, engineering and Title 24 consultant fees, and site work.
• —Detached 2-BR (1,000 sq ft) — driven by scope, grading, and finish level; model your parcel on the ROI calculator.

Permitting workflow

Long Beach Development Services reviews applications under the applicable state-law pathway and local objective standards. The statutory completeness and decision clocks are not a project-duration estimate. Check whether a specific parcel is in the coastal zone and which coastal approval process applies before scheduling work. See the permit timeline guide for the distinction between application review and the full build.

Utility connection: the LB Water and LB Energy story

Confirm whether a separate water meter or service change is needed and check current charges with Long Beach Water. Confirm electric and, if applicable, gas capacity with the serving utilities during feasibility. Utility requirements depend on the existing connections and proposed load; do not assume another city's utility process applies here.

Where Long Beach pencils best

• —Bixby Knolls and California Heights — verify the individual lot's access, existing structures and utility capacity.
• —Wrigley and West Long Beach — compare conversion feasibility with a detached design on the specific lot.
• —Belmont Shore and Naples — check the parcel's coastal status and applicable permit path.
• —Los Cerritos and Bixby Hill — check comparable listings for the proposed unit size before modeling rent.

Next steps

Pull APN, zoning, and coastal-zone status before committing to a design. Use the cost breakdown to test sensitivity, then discuss a site-specific feasibility review. Confirm scope and any fee in writing.