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GoldenStateADU

Timeline reality · Berkeley · City of Berkeley Planning & Permits

Berkeley ADU timeline — phase-by-phase, no fairy tales

Most Berkeley ADU contractors quote 6–8 months. Most Berkeley ADUs take 11–15 months from first call to keys. Here is the realistic schedule — feasibility, design, City of Berkeley Planning & Permits plan-check, construction, and finals — with the specific points where projects slip and how we keep ours on track.

City-specific deep dives

Phase 1 — Feasibility (1–2 weeks)

Survey, APN pull, zoning confirmation, overlay check, utility scoping, rough budget. In Berkeley this is where we catch the deal-breakers: hillside overlays, easements, undersized panels, sewer issues. Two weeks is realistic; one week is possible on a clean lot.

Phase 2 — Design & engineering (8–12 weeks)

Schematic design, design development, construction documents, Title 24, structural engineering, MEP coordination. Berkeley parcels with overlays or unusual geometry push toward the 12-week end. Weekly homeowner reviews keep this from drifting into 4-month territory.

Phase 3 — City of Berkeley Planning & Permits plan-check (12–20 weeks)

Submittal, first-pass review, comment response, second-pass approval, permit issuance. A clean first submittal in Berkeley is the single biggest schedule lever — it cuts plan-check from 5 months to 3. Overlays and resubmits drive the variance.

Phase 4 — Construction (20–28 weeks)

Foundation, framing, MEP rough-in, inspections, drywall, finishes, fixtures, final inspections. Berkeley construction time is steady; long-pole items are utility upgrades (panel, sewer lateral) and finish lead times. Pre-ordering long-lead items at permit issuance protects this phase.

Phase 5 — Finals, C of O, walk-through (2–4 weeks)

Final building inspection, final MEP inspections, fire clearance, Berkeley Certificate of Occupancy, homeowner walk-through, punch-list, keys. We don't call a project done until C of O is in hand and the homeowner has signed the walk.

Berkeley · Timeline reality

Questions Berkeley homeowners ask about timeline

Direct answers, Berkeley-specific.

  1. Does Berkeley always require design review for ADUs?
    No — state law's ministerial approval applies to compliant ADU projects. Where review is triggered, it's usually because of objective standards we can design around at concept.
  2. Are Berkeley ADUs much more expensive than Oakland?
    Slightly — typically 5–10% above Oakland equivalents, mostly driven by finish expectations and the city's more deliberate review pace.
  3. Does Berkeley have unique requirements that affect timeline?
    Yes — City of Berkeley Planning & Permits sets the local rules, and Berkeley has its own plan-check rhythm. The realistic numbers above reflect 2026 Berkeley conditions, not statewide averages.

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