ADU — Detached 1-bedroom Cost in San Francisco, 2026

Why detached 1-bedroom × San Francisco produces this band

A detached 1-bedroom scope for a adu in San Francisco combines two price levers: scope and metro labor rates. A detached 1-bedroom ADU is the category anchor: 500-750 SF standalone unit with a full kitchen, full bath, and bedroom. Separate foundation, roof, MEP, and entrance. Against the national median remodel labor rate, San Francisco runs 55% above the national median — so the detached 1-bedroom band comes in at the mid-range, then scales 55% above the national median on top of that. Permit timelines for residential work in San Francisco typically run 10-26 weeks, which is the window you plan your design and decision sequence against. This page gives you the actual 2026 San Francisco bands for this exact combination, plus the three cost drivers Baily asks about first when scoping the project live.

What drives cost for a detached 1-bedroom scope

• ·New foundation (slab-on-grade or stem-wall)
• ·New roof system and weather envelope
• ·Full MEP rough-in from the street (water, sewer, gas, electric)
• ·Site prep, grading, drainage

What makes San Francisco different

• Labor — Bay Area CSLB-licensed contractor scarcity keeps labor rates the highest in California.
• Labor — Union framing and electrical rates carry a 30-35% premium over national median.
• Labor — Tech-sector remodel demand (Noe Valley, Pacific Heights, Sea Cliff) competes for premium-finish crews.
• Material — Victorian + Edwardian heritage restoration uses specialty millwork and painters — significant premium.
• Material — Title 24 energy code same as rest of CA — envelope + glazing premium.

San Francisco rules that affect this scope

• SF DBI permit process is notably long (10-26 weeks typical; discretionary review on most kitchen/bath >$25K).
• Section 317 (Residential Demolition) controls ADU and addition work — lot merger and demolition ratio tracked.
• Historic Preservation Commission review for Articles 10 + 11 properties adds 8-16 weeks.
• Soft-story retrofit ordinance (SF Ordinance 66-13) affects multi-family properties with tuck-under parking.

Scope your adu with Baily.

Baily asks the eight questions that determine where your project lands inside the $279K-$589K band for San Francisco and hands the scoped brief to one licensed builder.

Related pages

Questions LA homeowners actually ask

• What is the 2026 cost range for a detached 1-bedroom scope adu in San Francisco?

  $279,000-$589,000, with the median landing near $434,000. The range reflects finish tier and layout complexity within the detached 1-bedroom scope; the San Francisco labor multiplier of 1.55× vs national median is baked in.

• How long does a detached 1-bedroom scope adu take in San Francisco?

  26-40 weeks of on-site construction for the detached 1-bedroom scope, plus 10-26 weeks of permit review in San Francisco if the scope requires a permit. Cosmetic-only refreshes often skip permits; anything touching plumbing, electrical, or structural does not.

• What is the single biggest budget-overrun risk for this scope?

  Sewer connection — if the existing lateral runs under the new foundation line, a new lateral cut plus utility easement and right-of-way bond can add $12-22K.