Sacramento, Sacramento County, Elk Grove, and Citrus Heights all publish free pre-approved ADU plans that skip plan-check entirely. Custom plans take longer and cost more — but on the right lot, they're worth every dollar. Here's how to decide.
Pre-approved plan fee: $0
Custom plans cost: $8K–$18K
Plan-check savings: 4–8 weeks
Plan-check (custom): 6–12 weeks
What this guide covers
Each section below answers one part of the question in plain language, with 2026 Sacramento-region numbers rather than national averages.
Side-by-side comparison — Pre-approved plans are the fastest, cheapest path to a permitted ADU — Sacramento jurisdictions have already done the structural and Title-24 review, so plan-check turns into a short over-the-counter check instead of a multi-month review cycle.
When pre-approved plans win — If your lot is a standard rectangular shape with normal setbacks and you're optimizing for speed-to-tenant or speed-to-occupancy, pre-approved plans are nearly always the right call.
When custom plans are worth the extra cost — Pick custom when the lot demands it (slope, lot shape, mature trees, unusual setbacks), when you want a layout the city library doesn't offer, or when long-term family use justifies the architectural investment.
Hybrid: customize a pre-approved shell — A1's most popular path in 2026 is the hybrid: start with a pre-approved exterior shell and customize the interior layout, finishes, and kitchen/bath spec.
Frequently asked: Pre-Approved vs Custom ADU Plans Sacramento
The questions homeowners ask most about this topic, answered by a CSLB-licensed Sacramento builder.
Are pre-approved ADU plans really free in Sacramento? Yes. The City of Sacramento, Sacramento County, Elk Grove, and Citrus Heights all publish free pre-approved ADU plans that any homeowner can use. You still pay the building permit fee and (in some jurisdictions) impact fees, but the architectural plans themselves cost $0.
How much faster is a pre-approved plan? 4–8 weeks faster on permits in most Sacramento-region jurisdictions. The City of Sacramento often issues over-the-counter permits for pre-approved plans, while custom plans run 6–12 weeks of plan-check.
Can I customize a pre-approved plan? Interior layout, finishes, kitchen, and bathroom configurations are fully customizable on most pre-approved plans. Exterior dimensions, structural envelope, and Title-24 energy envelope must match the approved plan to keep the fast-track permit benefit.
Do pre-approved plans hurt resale value? No. Sacramento appraisers value ADUs based on size, condition, and rental income — not whether the plan was custom or pre-approved. As long as the build quality is solid, resale lift is identical.
How we deliver Pre-Approved vs Custom ADU Plans Sacramento
Every project runs through the same five-stage process, so you know what happens next and what it costs before construction starts. We handle design, engineering, jurisdictional plan check and construction under one contract, which keeps the schedule and the budget with a single accountable team.
Stage 1 — Site walk and feasibility: setbacks, utilities, easements and lot coverage reviewed on site
Stage 2 — Fixed-scope proposal: line-item pricing with permits, utility connections and finishes included
Stage 3 — Design and engineering: architectural plans, Title 24 energy calcs and structural engineering
Stage 4 — Permitting and plan check: submittal, corrections and approvals handled by our office
Stage 5 — Construction and closeout: weekly updates, final inspection, certificate of occupancy and warranty
Why homeowners choose A1 for Pre-Approved vs Custom ADU Plans Sacramento
A1 Building Contractors LLC is a veteran-owned, CSLB-licensed general contractor based in Roseville, CA. We design, permit and build ADUs, garage conversions, home additions and custom homes across the Sacramento region, with transparent line-item pricing and a single point of contact from first site walk to final inspection.
CSLB #1094366 General Contractor · DRE #00898265 Broker
Serving Sacramento, Placer, El Dorado, Yolo and Sutter counties
In-house design, permitting, plan check and construction
4010 Foothills Blvd Ste 103-155, Roseville, CA 95747