ADU Builder & Home Additions in Corona, 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
- Corona
Design · Permit · Build
ADUs & Additions in Corona
Detached ADUs, garage conversions and additions, from plans to move-in.
Book a Consultation Call 818-300-2393
Built for Corona Homes
Corona grew up around a circle. Civil engineer H.C. Kellogg turned founder R.B. Taylor's idea of a grand circular boulevard into Grand Boulevard, with a grid of streets enclosed inside it, and the loop hosted the Corona Road Races between 1913 and 1916, by which time the town was already known as the Lemon Capital of the World.
The city has since added more than thirty specific plans, from Sierra Del Oro and Corona Ranch to Eagle Glen and Dos Lagos. On a backyard here the deciding questions are slope position, where the pool equipment can legally sit, and whether the parcel falls in a mapped fire hazard zone.
Two broad patterns: the original grid of streets enclosed by Grand Boulevard, and the later specific-plan communities, where development standards are set plan by plan. Slope position and fire hazard mapping vary from lot to lot, so both are checked before design starts.
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 Corona: The Building Division is one of four divisions in the Planning & Development Department, alongside Planning, Code Compliance and Development Services, and works from 400 South Vicentia Avenue on a Monday-through-Thursday schedule, closed Fridays.
Plans are submitted and tracked through the city's eTRAKiT portal. The division's pool advisory requires Development Services and Planning approval before a pool goes to building plan check, structural plans prepared and stamped by a licensed architect or engineer, and a soils report wherever the Building Official calls for one; barbecue islands that include a sink also require plan review.
Chapter 7A ignition-resistant construction applies in the mapped Very High Fire Hazard Severity Zone, the city's 2025 map update extends that standard to High zones once adopted, and applicants are asked to verify a parcel's zone before plan check.
Permit details checked September 2026 against City of Corona . Rules change, so we confirm them again for your parcel.
What We Build
- Top-of-slope pool setback engineering
- Equipment placement and sound wall detailing
- Chapter 7A ignition-resistant specification
- 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 Corona
These local conditions change the scope, the schedule and the budget.
01
A pool shell closer than seven feet to the top of a slope must be engineered to hold its water without soil support, and near the toe of a slope steeper than one in three the setback is a quarter of the slope height, so slope position often decides where a pool can sit.
02
Pumps and filters must stand at least ten feet from an adjoining property line unless a block wall at least five feet high, extending two feet past the equipment on each side, separates them from the neighbor, which drives equipment pad and sound wall placement.
03
Roughly 3,000 structures sit inside the city's Very High Fire Hazard Severity Zone and just over 14,000 more lie within half a mile of it, so venting, decking and cladding choices near the wildland edge are made with ember exposure in mind.
04
Staging sand or materials in the street during a pool build requires an encroachment permit from Development Services, and draining a pool or backwash to the sewer through a P-trap is prohibited without Utilities Department approval, so logistics and discharge are planned before excavation.
Areas we serve in Corona:Sierra Del OroCorona RanchMountain GateEagle GlenDos LagosSouth Corona
Investment
What It Costs in Corona
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 Corona property
The Process
How We Work in Corona
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 Corona that submittal goes to City of Corona Planning & 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 Corona Homeowners Ask
Who issues the permits for this work in Corona?
City of Corona Planning & Development Department, Building Division. The Building Division is one of four divisions in the Planning & Development Department, alongside Planning, Code Compliance and Development Services, and works from 400 South Vicentia Avenue on a Monday-through-Thursday schedule, closed Fridays.
Plans are submitted and tracked through the city's eTRAKiT portal. The division's pool advisory requires Development Services and Planning approval before a pool goes to building plan check, structural plans prepared and stamped by a licensed architect or engineer, and a soils report wherever the Building Official calls for one; barbecue islands that include a sink also require plan review.
Chapter 7A ignition-resistant construction applies in the mapped Very High Fire Hazard Severity Zone, the city's 2025 map update extends that standard to High zones once adopted, and applicants are asked to verify a parcel's zone before plan check.
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 Corona different?
Two broad patterns: the original grid of streets enclosed by Grand Boulevard, and the later specific-plan communities, where development standards are set plan by plan. Slope position and fire hazard mapping vary from lot to lot, so both are checked before design starts.
One local condition that shapes the work: A pool shell closer than seven feet to the top of a slope must be engineered to hold its water without soil support, and near the toe of a slope steeper than one in three the setback is a quarter of the slope height, so slope position often decides where a pool can sit.
Which parts of Corona do you work in?
All of it, including Sierra Del Oro, Corona Ranch, Mountain Gate and Eagle Glen. 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 Corona?
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 Corona
Pool & Spa Remodeling in Corona Backyard & Outdoor Living in Corona Everything we build in Corona
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Planning Guides
Before You Build in Corona
Costs, materials and process notes from our own projects.
Corona Outdoor Kitchens: Shade, Materials & Costs Corona's hot summers require outdoor kitchens designed for heat management. Here's how to build for comfort and durability. Read guide ADU Cost Breakdown by Size in Los Angeles A detached ADU in Los Angeles runs $150,000 to $400,000-plus. Here is the real cost broken down by unit size, with the soft costs, utility work and finish decisions that move the number. Read guide Garage Conversion to ADU: The Step-by-Step Build A garage conversion runs $80,000 to $180,000 in Southern California. Here is the real sequence, from slab testing and plan check to the raised floor, the mini-split and final sign-off. Read guide ADU Rental Income Math in the San Fernando Valley A one-bedroom ADU in the San Fernando Valley rents for roughly $2,100 to $2,900 a month. Here is the honest arithmetic on payback, carrying costs and what the unit adds to the property. Read guide
Planning an ADU in Corona?
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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