Number 1: Home Addition Contractors in Orange County California
on GoogleOrange County
A general contractor in Orange County, California, working on home additions, ADUs and design-build projects.
Home addition contractors in Orange County
The 10 home addition contractors from Google's results for Orange County, California, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
- Bump-out
- $28,500 – $69,000small single-room extension
- Room addition
- $92,000 – $230,000ground floor, finished
- Second-story addition
- $172,500 – $460,000whole or partial floor
- Orange County vs US
- +15%well above the US median
Licensing in California. California contractors need a CSLB license for most remodeling work. Check the license number and its bond on the CSLB site before you sign.
Number 2: Home Additions in Orange County
on GoogleEncino, CA
An Encino, California business covering kitchen remodels, home additions, ADUs and siding.
(818) 317-3567 17141 Ventura Blvd, Encino, CA 91316
Number 3: DYM Builders
on GoogleIrvine, CA
DYM Builders Group builds custom homes and handles remodeling, ADUs and garage conversions in Orange County, Los Angeles and Dallas, Texas. Based in Irvine, it works on home additions and design-build projects alongside its other construction services.
(800) 396-6773 2372 Morse Ave #987, Irvine, CA 92614
Number 4: OC Builders Group
on GoogleSanta Ana, CA
OC Builders Group is a design-build remodeling contractor in Orange, California, working on residential properties. Its services include kitchen remodels with custom cabinetry and countertops, bathroom remodels with tile work, freestanding tubs and vanities, and new home construction.
(714) 417-7771 600 W Santa Ana Blvd Ste 114-499, Santa Ana, CA 92701
Number 5: Dreamcatcher Remodeling
on GoogleSan Juan Capistrano, CA
Based in San Juan Capistrano, Dreamcatcher Remodeling builds home additions across Orange County, including second-story additions for homeowners who want more room without giving up yard space. Building up rather than out lets these projects add bedrooms and living areas on the existing footprint.
(855) 854-9030 31831 Camino Capistrano Ste 101 / Office 107, San Juan Capistrano, CA 92675
Number 6: SoCal Home Renovation
on GoogleDana Point, CA
SoCal Home Renovation is a general contractor in Dana Point that builds room additions and second-story additions for Orange County homeowners, including in Irvine. It works with families who would rather expand their current house than move to gain square footage.
(855) 530-0545 32400 Crown Valley Pkwy, Dana Point, CA 92629
Number 7: Orange County Construction
on GoogleAnaheim, CA
Orange County Construction is an Anaheim, California contractor listed for home additions and ADU construction.
(714) 231-9773 1173 N Red Gum St, Anaheim, CA 92806
Number 8: Room Additions
on GoogleIrvine, CA
Sea Pointe is an Irvine design-build firm that remodels bathrooms across Orange County, from spa-style primary baths to smaller updates. It also plans and builds home additions, working through local permitting and zoning rules that decide whether a room goes up or out.
(949) 755-0416 576 Wald, Irvine, CA 92618
Number 9: Keely Design Build
on GoogleOrange County
Keely Design Build is an Orange County design-build firm where one team handles both the design and construction of home additions. Projects range from a single added room to a full second story, planned to match the original architecture, including the roof connection between new and existing sections.
Number 10: OCCP Construction
Orange County
OCCP Construction builds home additions in Orange County, covering both the new space and the structural tie-ins that connect it to the existing house. Scope details such as layout, existing conditions and finish selections are worked out before plans are finalized.
What home addition contractors charge in Orange County
In Orange County, a bump-out typically costs $28,500 – $69,000. Remodeling labor in Orange County runs about 15% above the US median, which accounts for most of the difference from the same project elsewhere.
How to choose between them
- Check the license yourself. Where California or Orange County licenses this work, the licensing board's own lookup confirms a license number in a minute. Do it before you sign, not after.
- Get three bids on the same scope. Written down, split into labor, materials, allowances and anything structural. Most people compare a total against a total and end up choosing between two different projects.
- Ask what is not included. Permits, debris removal, fixture and finish allowances, and repairs after demolition are the four that turn a cheap bid into an average one.
- Never pay a large deposit up front. A deposit to order materials and hold a start date is normal. Half the total before anyone shows up is not.
How this list is ordered
These are the firms from Google's results for "home additions orange county ca", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
Home addition contractors in Orange County: common questions
Do I need an architect for a home addition?
Usually yes, or a design-build firm with in-house design. Additions need stamped structural drawings for the permit in most places, and zoning review on setbacks, height and lot coverage.