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GoldenStateADU

Timeline reality · Sunnyvale · City of Sunnyvale Community Development

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

Most Sunnyvale ADU contractors quote 6–8 months. Most Sunnyvale ADUs take 11–15 months from first call to keys. Here is the realistic schedule — feasibility, design, City of Sunnyvale Community Development 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 Sunnyvale 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. Sunnyvale 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 Sunnyvale Community Development plan-check (12–20 weeks)

Submittal, first-pass review, comment response, second-pass approval, permit issuance. A clean first submittal in Sunnyvale 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. Sunnyvale 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, Sunnyvale 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.

Sunnyvale · Timeline reality

Questions Sunnyvale homeowners ask about timeline

Direct answers, Sunnyvale-specific.

  1. Is Sunnyvale strict on ADU design?
    Standard South Bay objective standards apply. Heritage District work has compatibility considerations; outside it, the path is straightforward.
  2. Does Sunnyvale have unique requirements that affect timeline?
    Yes — City of Sunnyvale Community Development sets the local rules, and Sunnyvale has its own plan-check rhythm. The realistic numbers above reflect 2026 Sunnyvale conditions, not statewide averages.

Continue researching Sunnyvale

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