ADU Builder & Home Additions in Orange, CA | Remodel Your Vibe
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Last modified: 2026-09-24T00:00:00.000Z
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Image: Detached backyard ADU with wood siding and black-framed glass doors at dusk
- Orange
Design · Permit · Build
ADUs & Additions in Orange
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Orange Homes
Orange holds two distinct building environments inside one city line. The central and western city sits on a flat alluvial plain, where Old Towne, gathered around its Plaza, contains the largest National Register historic district in California and exterior changes follow the city's preservation design standards.
Three Eichler tracts built between 1960 and 1964, Fairhaven, Fairmeadow and Fairhills, are local historic districts too, their rear walls opening to the yard in floor-to-ceiling glass. East of the plain the land rises into the foothills of the Santa Ana Mountains around Santiago Hills and Orange Park Acres, and the General Plan names the developed fringe of those hillsides as the place where wildland fire is most problematic.
In a historic district an addition or ADU starts with a historic resource assessment; in the foothills, a new home or ADU in a Fire Hazard Severity Zone falls under the city's Wildland-Urban Interface Code.
Single-family zoning runs from 6,000-square-foot minimum lots in R1-6 up to one acre in R1-40 and two and a half acres in the rural R1-R district, whose stated purpose is to minimize changes to riparian habitat, oak woodlands and prominent landforms; the 5,000-square-foot R1-5 district is intended for limited use in large-scale developments that keep at least 40 percent of their planning area as open space.
Old Towne's residential quadrants sit on the flat plain around the Plaza. Serrano Heights and Santiago Hills II are governed by their own specific plans, and Orange Park Acres, in east Orange, by a neighborhood plan, where the General Plan's Estate Low Density designation provides for estate homes on large lots and can allow private equestrian use.
We are a design-build team, which means the people who draw your project are the people who build it. Design, engineering, permits and construction run through one project manager and our own crews, so nothing gets lost in a handoff between a salesperson and a subcontractor. We are licensed, bonded and insured, CSLB license #1119054 .
Permits in Orange: Inside city limits, the Building Division accepts permit applications only through the city's Civic Portal, and an ADU or JADU needs an approved Planning Division application before plans can go to building plan check. Pockets of El Modena and Orange Park Acres remain unincorporated county land, where OC Public Works Building and Safety handles permits instead.
Exterior changes in Old Towne must meet the Historic Preservation Design Standards for Old Towne, the Fairhaven, Fairhills and Fairmeadow Eichler tracts follow the Orange Eichler Design Standards, and additions, infill and ADUs in any of the city's four historic districts also require a historic resource assessment prepared by a qualified preservation professional.
The Orange City Wildland-Urban Interface Code, adopted in November 2025, applies to new homes in any Fire Hazard Severity Zone and to structures accessory to them, with exceptions that include detached utility buildings at least 50 feet from the house; for new buildings in a Very High zone, the final fuel modification plan must be approved by the fire code official before a grading permit is issued.
Permit details checked September 2026 against Orange Municipal Code . Rules change, so we confirm them again for your parcel.
What We Build
- Old Towne and Eichler design standards review
- Historic resource assessments for ADUs and additions
- Fuel modification and WUI code compliance
- Acoustic screening for pool equipment
- Geotechnical reports in liquefaction areas
- Detached ADUs, ground-up
- Garage conversions to living space
- Junior ADUs within the main house
- Room additions and bump-outs
- Second-story additions
- Full kitchens and bathrooms in the ADU
- Separate utility metering where required
- Private entries, patios and landscaping
- Plans, engineering and city submittals
- Title 24 energy compliance
Local Conditions
What to Know in Orange
These local conditions change the scope, the schedule and the budget.
01
The central and western city sits on an alluvial plain underlain by many thousands of feet of river and floodplain sediment, and ground beside the Santa Ana River and Santiago Creek is susceptible to flooding and seismically induced liquefaction. The Building Division requires a geotechnical report for residential foundation work except one-story additions and one-story detached ADUs or accessory structures of up to 1,200 square feet outside liquefaction areas.
02
East of the plain, the foothills of the Santa Ana Mountains sit on bedrock, and the General Plan identifies the developed residential fringe of those hillsides as the place where wildland fire is most problematic, with dry vegetation and Santa Ana winds raising the seasonal risk. On CAL FIRE's 2025 hazard map, which the city adopted by ordinance, the east side moves between Moderate, High and Very High within short distances, and Class A roof coverings are required citywide.
03
A pool or spa can sit anywhere outside the required front yard setback, but it needs a fence or wall at least five feet high with self-closing, self-latching gates, and on a lot with two or fewer units a clear path at least three feet wide around at least half its perimeter. Pool equipment must be acoustically shielded and screened from adjacent streets and properties by a solid wall, solid fence or landscaping, or else enclosed in a building.
04
In the Eichler tracts, floor-to-ceiling windows and large sliding glass doors open the rear of each house to the yard, which gives these homes their indoor-outdoor character, and any project that affects the exterior of an Eichler home must comply with the Orange Eichler Design Standards.
Areas we serve in Orange:Old TowneEl ModenaFairhavenOrange Park AcresSerrano HeightsSantiago Hills
Investment
What It Costs in Orange
Real Southern California price ranges, not teaser numbers.
Detached ADU
$150,000 to $400,000+
What moves it: square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build
Garage conversion ADU
$80,000 to $180,000
What moves it: whether the existing slab and framing meet current code, how far utilities have to run, and the finish level of the kitchen and bathroom
Plans, drawings and permit management
$4,500 to $25,000+
What moves it: project type and size, whether structural engineering, Title 24 or a soils report is required, and how many jurisdictions or review bodies are involved
Your lot, access and finishes set the price. We walk the site, then show you where every dollar goes.
Get a line-item price for your Orange property
The Process
How We Work in Orange
01
Feasibility
We check lot size, setbacks, utilities and access to confirm what your property will actually support.
02
Design & 3D
Layout, elevations and finishes, modeled in 3D so you approve the unit before submittal.
03
Plans & Permits
We prepare the full drawing set, handle engineering and Title 24, and manage the city submittal and corrections. In Orange that submittal goes to City of Orange Community Development Department, Building Division.
04
Foundation & Framing
Site prep, foundation, framing and dry-in by our own crews.
05
Systems & Finishes
Electrical, plumbing, HVAC, insulation, then kitchen, bath and interior finishes.
06
Final Inspection
We pass final inspection, walk the unit with you and hand over the keys.
Questions
What Orange Homeowners Ask
Who issues the permits for this work in Orange?
City of Orange Community Development Department, Building Division. Inside city limits, the Building Division accepts permit applications only through the city's Civic Portal, and an ADU or JADU needs an approved Planning Division application before plans can go to building plan check.
Pockets of El Modena and Orange Park Acres remain unincorporated county land, where OC Public Works Building and Safety handles permits instead. Exterior changes in Old Towne must meet the Historic Preservation Design Standards for Old Towne, the Fairhaven, Fairhills and Fairmeadow Eichler tracts follow the Orange Eichler Design Standards, and additions, infill and ADUs in any of the city's four historic districts also require a historic resource assessment prepared by a qualified preservation professional.
The Orange City Wildland-Urban Interface Code, adopted in November 2025, applies to new homes in any Fire Hazard Severity Zone and to structures accessory to them, with exceptions that include detached utility buildings at least 50 feet from the house; for new buildings in a Very High zone, the final fuel modification plan must be approved by the fire code official before a grading permit is issued.
We prepare the drawings, make the submittal and handle plan-check corrections ourselves, so you are not the one chasing plan check.
What makes building in Orange different?
Single-family zoning runs from 6,000-square-foot minimum lots in R1-6 up to one acre in R1-40 and two and a half acres in the rural R1-R district, whose stated purpose is to minimize changes to riparian habitat, oak woodlands and prominent landforms; the 5,000-square-foot R1-5 district is intended for limited use in large-scale developments that keep at least 40 percent of their planning area as open space.
Old Towne's residential quadrants sit on the flat plain around the Plaza. Serrano Heights and Santiago Hills II are governed by their own specific plans, and Orange Park Acres, in east Orange, by a neighborhood plan, where the General Plan's Estate Low Density designation provides for estate homes on large lots and can allow private equestrian use.
One local condition that shapes the work: The central and western city sits on an alluvial plain underlain by many thousands of feet of river and floodplain sediment, and ground beside the Santa Ana River and Santiago Creek is susceptible to flooding and seismically induced liquefaction.
The Building Division requires a geotechnical report for residential foundation work except one-story additions and one-story detached ADUs or accessory structures of up to 1,200 square feet outside liquefaction areas.
Which parts of Orange do you work in?
All of it, including Old Towne, El Modena, Fairhaven and Orange Park Acres. Our crews run every job out of our Cahuenga Pass base in Los Angeles, with our own people on site.
What does an ADU or addition cost in Orange?
Detached ADU: generally $150,000 to $400,000+ across Southern California. What moves it is square footage, finish level, utility runs, and site access; garage conversions typically run well below a ground-up detached build. We give line-item pricing after seeing the site rather than quoting a number over the phone.
How long does an ADU take start to finish?
Plan a realistic year. Design and engineering typically take one to three months, city plan check and corrections add several more, and construction usually runs four to eight months depending on size and site access.
Is a garage conversion cheaper than a detached ADU?
Usually yes, and often substantially, because the foundation, walls and roof already exist. The trade-offs are that you lose the garage, and older slabs and framing sometimes need upgrading to meet current code.
Can I rent the ADU out?
California ADU law is designed to allow long-term rental, and an ADU is one of the few ways to add rentable square footage to a single-family lot. Short-term rental rules vary by city, so confirm your local ordinance before counting on that income.
Do you handle the permits?
Yes. Plans, engineering, Title 24 and the city submittal are all handled in-house, including responding to plan-check corrections. That is a service we sell on its own, so it is not something we hand off.
More Services in Orange
Pool & Spa Remodeling in Orange Backyard & Outdoor Living in Orange Everything we build in Orange
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Planning Guides
Before You Build in Orange
Costs, materials and process notes from our own projects.
Irvine Outdoor Living Cost and HOA Approval Guide An Irvine backyard build runs $45,000 to $160,000 by yard size. Line-item costs, the two-step HOA and City approval path, Title 24 requirements and the side-gate access problem. Read guide Huntington Beach Backyard Cost: Sand, Wind and Salt What a Huntington Beach backyard costs, plus the shallow water table, sandy soil compaction, daily onshore wind and salt-air material specifications that decide how long the work survives. Read guide Beach House Renovation in Orange County OC beach homes face unique challenges: salt air, humidity, coastal commission review. Here's what renovation requires. Read guide Irvine ADU Construction: City Rules, HOAs & Costs Irvine ADU construction must navigate both City regulations and HOA architectural guidelines. Here's how to build successfully in master-planned communities. Read guide
Planning an ADU in Orange?
Sit down with your project manager and get an accurate estimate. We call you back within one business day.
Book a Consultation 818-300-2393
Licensed, bonded & insured · CSLB license #1119054
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