Bring Your Project to Life with Streamline Design & Permitting
Turn your ideas into code-compliant, permit-ready plans with our expert Orange County ADU drafting team. Schedule a consultation today and see how we can help.
Orange County ADU Drafting Services
A detached ADU in Orange County can run up to 1,200 square feet, but a permit only moves as fast as the drawings behind it. We draft precise, code-compliant plans for everything from ADUs and additions to full commercial buildouts, then guide you through permitting from application to approval.
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See why property owners throughout Orange County and beyond rely on our drafting and permitting expertise for their projects.
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About
Your Local Drafting and Permit Specialists
Streamline Design & Permitting delivers complete ADU drafting services in Orange County for homeowners, developers, and businesses. Our detailed, code-compliant plans help you secure building permits faster and keep your project on schedule — without unexpected and frustrating setbacks.
Our skilled team of designers provides advanced 3D CAD drafting, allowing you to preview your design before construction begins. After your plans are approved, we'll connect you with trusted local builders to bring your vision to life seamlessly.
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Our Services
From ADUs to Commercial Projects: Our Orange County ADU Drafting Services
We handle projects of all sizes and levels of complication, ensuring each plan complies with Orange County building and zoning standards.
Accessory Dwelling Units (ADUs)
As your full-service ADU drafting partner in Orange County, we handle every unit type below under one point of contact, from initial feasibility through permit-ready plans. Each drawing set is coordinated with structural engineering and Title 24 documentation before it ever reaches your building department.
Multi-Family ADUs
We design detached ADU additions for duplexes, triplexes, and small apartment properties, where owners can add units under SB 1211. Our drawings document unit count, parking, and utility capacity across the full property.
Garage to ADU
Garage conversions reuse your existing foundation, roof, and framing to keep costs down. We prepare as-built and conversion drawings that document structural conditions, new plumbing, and electrical routing for plan check.
Basement to ADU
We convert underutilized basement space into a fully permitted living unit. Our drawings address egress, ceiling height, moisture control, and ventilation requirements specific to below-grade construction.
Junior ADU
We draft Junior ADUs up to 500 square feet within your home's existing footprint. Under AB 1154, effective January 1, 2026, owner-occupancy is only required when a JADU shares sanitation facilities with the main house, a distinction our drawings document clearly.
Attached ADU
Our attached ADU drawings show how a new unit ties into your home's existing framing, roofline, and utility systems. Each design keeps a fully independent entrance and layout while satisfying shared-wall fire separation requirements.
Detached ADU
We draft freestanding backyard units up to 1,200 square feet, engineered around your lot's buildable area and setback lines. Detached ADU designs document foundation, framing, and utility connections in full.
ADU Feasibility Studies
Before any design work begins, we assess your lot's buildable area, zoning, and utility access to confirm what your property can realistically support. This upfront analysis prevents costly redesigns later in the process.
Unpermitted ADUs Legalization
Under AB 2533, local agencies cannot deny a legalization permit for a pre-2020 unpermitted ADU based on building standard violations alone. We produce the forensic as-built drawings your building department requires to bring the structure into compliance.
3D Rendering & Visualization
We provide photorealistic 3D renderings so you can see your ADU before construction begins. This helps you refine layout, finishes, and design decisions with confidence prior to permit submission.
ADU Regulations & Requirements in Orange County
Orange County adheres to California ADU laws (Cal. Gov. Code §§66310–66342) and local building standards. Key points include:
- Permitted locations: ADUs and Junior ADUs (JADUs) may be built on lots with existing single- or multi-family homes per the Orange County Zoning Code.
- Quantity allowed: Single-family lots can include one ADU and one JADU; multi-family parcels may add two detached ADUs plus conversions of existing spaces.
- Size limits: Detached ADUs up to 1,200 sq. ft.; attached ADUs limited to 50 percent of the main home's size or 1,200 sq. ft., whichever is smaller.
- Setbacks: Minimum 4 ft from side and rear property lines (Orange County Zoning Code §7-9-90).
- Parking: One space per unit, unless within 0.5 miles of public transit or meeting state exemptions (HCD Guidelines).
- Building standards: Compliance with the California Building Code and Title 24 Energy Standards; new detached units must meet solar-readiness requirements.
Transform Ideas into Tangible Plans
Work with our Orange County drafting experts for seamless, permit-ready designs.
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Process
How Our Orange County ADU Building Designers Streamline Your Project
We make drafting and permitting simple:
- 01
Consultation & Planning
Align your goals with a functional design plan.
- 02
Design Development
Deliver accurate, code-compliant drafts.
- 03
Specialist Collaboration
Work with engineers and surveyors to refine plans.
- 04
Permit Preparation
Handle submittals to the Orange County Building Division.
- 05
Project Finalization
Deliver approved, construction-ready plans.
Why Us
Why Clients Choose Streamline Design & Permitting
Orange County property owners have plenty of drafting companies to choose from. Here's where Streamline Design & Permitting stands apart:
Code Expertise
Creative, compliant solutions for even the most challenging properties.
Proven Track Record
Dozens of approved permits and successful builds.
Local Knowledge
In-depth understanding of Orange County codes and zoning.
Reliable Delivery
On-time results with proactive communication.
Transparent Pricing
Drafting services typically run 3–4 percent of your total project cost.
Contact Us
Schedule a Strategic Project Review Today
Our Orange County ADU drafting experts create code-compliant drafting plans that simplify approvals and move your Orange County project forward with confidence.
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FAQ
FAQ Regarding Drafting Services in Orange County
- 01
How much do drafting services cost in Orange County?
Professional drafting is a smart investment in accurate plans, smoother permitting, and fewer costly revisions. Pricing varies by project scope and complexity, and we provide a transparent estimate before any work begins.
- 02
What projects don't require a permit in California?
Most non-structural work, like painting or faucet swaps, needs no permit. Fence limits vary by city; backyards often allow 6 feet, front yards less. Confirm locally, or check the county's building permit overview.
- 03
What do drafting services include?
Drafting services provide detailed plans showing layouts, measurements, and specifications needed for permits and construction, helping homeowners and officials align on every aspect of the project.
- 04
Do ADU requirements differ across Orange County's cities?
Yes. State law sets the baseline, but cities like Irvine, Anaheim, Santa Ana, and Newport Beach, plus the unincorporated county, can add their own zoning overlays and design standards. We confirm your jurisdiction's specific rules before drafting begins.
- 05
Do I need a Coastal Development Permit for an ADU in Orange County?
Coastal-zone properties, including parts of Newport Beach, Huntington Beach, and Laguna Beach, may need a Coastal Development Permit alongside your building permit. Under AB 462, effective January 1, 2026, that review now runs on the same 60-day window as a standard ADU application.