Phase 1: Site Assessment (Weeks 1–2)

Perris site assessments are faster than most cities because pre-approved plan eligibility can be confirmed early. In our first site visit we cover: lot dimensions and setbacks, FEMA flood zone status check (msc.fema.gov — this takes 5 minutes and determines whether elevation compliance is required), water district identification (EMWD for most, EVMWD for eastern parcels), HOA status check, and pre-approved plan eligibility assessment. If the lot is flood zone-free and has standard geometry, we can confirm pre-approved plan eligibility on the spot.

Phase 2: Design (Weeks 2–6 Custom / Weeks 2–4 Pre-Approved)

Pre-approved plan path: We select the appropriate plan set from the City of Perris's AB 1332 library that fits your lot and your income goals. We may need to make minor site-plan adjustments (utility locations, setback confirmation) but no full architectural design is required. Submittal-ready in 2–4 weeks from site assessment. This is the fastest path to a Perris permit — and for standard residential lots without unusual constraints, it's the right choice.

Custom plan path: For flood zone lots requiring elevated construction, irregular lot configurations, or HOA requirements that the pre-approved plan can't satisfy — architectural design (2–4 weeks), structural engineering (2–3 weeks concurrent), Title 24 (1–2 weeks concurrent). Flood zone lots add Base Flood Elevation documentation and elevation certificate specification to the drawings — typically an extra 1–2 weeks of design work.

Phase 3: Permit Submittal — Perris Development Department (Weeks 5–13)

Submittal is to the City of Perris Development Department at 101 N D St. For pre-approved plan projects: 30-day review timeline. For custom plan projects: 4–8 weeks plan check. The department has specific ADU reviewers who are familiar with the California ADU law framework and process applications with priority.

Simultaneously: EMWD or EVMWD water and sewer connection application filed at permit submittal. This parallel filing prevents 6–10 weeks of utility review from extending the back end of the project. EMWD's connection process for Perris projects typically runs 8–12 weeks — starting at permit submittal rather than after approval is essential.

Phase 4: Construction (Weeks 12–32)

Standard construction phases apply. Flood zone properties add one construction step: elevation certificate survey after foundation is poured and before framing begins — a licensed surveyor confirms that the foundation top of slab meets the Base Flood Elevation. This survey takes 1–2 weeks and must happen before framing inspection. We schedule this proactively so it doesn't hold up framing start.

Perris's construction environment benefits from strong subcontractor availability — the city's I-215 position makes it accessible for trades from both the San Bernardino and Riverside markets. Material delivery logistics are also efficient given the area's logistics corridor.

Phase 5: Certificate of Occupancy (Weeks 30–36)

EMWD or EVMWD final connection and meter installation. City final inspection and CO issuance. For flood zone properties: final elevation certificate confirming all finished construction meets NFIP standards. CO issuance to first tenant: 1–2 weeks in Perris's strong rental market.