ADU & Home Addition Builders in Greater Los Angeles
Design-build ADUs, garage conversions, and home additions from Ventura to Long Beach — first sketch to final keys, under one contract.
Serving Greater Los Angeles from Woodland Hills
One design-build team based at 22256 Buenaventura St, Woodland Hills, CA 91364, matched to each city's or county's permit path. Start with your county, or jump to a city page.
Alongside ADUs, we build home addition contractors in Los Angeles — room, second-story and kitchen additions — as well as in southern Ventura County. Explore our Los Angeles County service area for local planning details.
Full-service design & build — from concept to keys.
At HomeAdd we don't just plan — we build. As a California design-build company, we manage your project end-to-end, coordinating design, engineering, and construction under one contract.
Our coordinated team manages every phase: feasibility, structural engineering, permitting, and the final coat of paint. Old-school craftsmanship, modern construction technology, with clear communication throughout.
Every way to add square footage to your property.
ADUs, additions, and conversions — permitted, engineered, and built by one team. A common starting point is a detached ADU in the backyard; if you're still deciding, our ADU and home addition guides and homeowner FAQ cover feasibility, permitting, and planning budgets.
Reusing an existing garage? Our garage-to-ADU conversion contractors coordinate design, permits and construction for a separate dwelling.
ADUDesign inspirationDetached ADU
A standalone backyard home — up to 1,200 sq ft, its own address, real rental income.
View Detached ADU details
ADUDesign inspirationAttached ADU
New living space seamlessly bolted to your existing home — shared wall, separate life.
View Attached ADU details
ConvertDesign inspirationGarage Conversion
Often the most cost-effective path to permitted living space.
View Garage Conversion details
ADUDesign inspirationAbove-Garage ADU
Stack a second-story unit over your garage — square footage without giving up yard.
View Above-Garage ADU details
JADUDesign inspirationJunior ADU (JADU)
Up to 500 sq ft carved inside your existing home — the simplest permit path.
View Junior ADU (JADU) details
AddDesign inspirationRoom Addition
One more bedroom, an office, a nursery — added to your existing footprint.
View Room Addition details
ExpandDesign inspirationHome Addition
Second stories, full wings, kitchen expansions — significant square footage.
View Home Addition details
ExpandDesign inspirationSecond-Story Addition
Double your square footage without touching the yard — a full second floor built above your existing home.
View Second-Story Addition detailsFour steps. One team. One written proposal.
Feasibility & site walk
We visit, review setbacks, utilities, and zoning, and tell you honestly what's buildable.
Design & written pricing
Coordinated architectural drawings with a defined scope and a transparent, itemized budget.
Permits & plan check
We handle permit submittals with LADBS, LA County and the city building departments in Los Angeles and Ventura counties. You just approve.
Build & handoff
One project manager, regular updates, and a documented closeout when we hand you the keys.
Want to add a room, a bedroom, or a kitchen? Here's how the options compare.
Most homeowners start with a need — one more bedroom, a bigger kitchen, space for a parent or a tenant — not with a construction term. These are the five paths we build, what each one is actually good for, and where to read more. Every path below is a permitted project: design, engineering, plan check, and construction under one contract.
Room addition
A new bedroom, office, or bath built onto the existing house, tied into the current roofline, foundation, and HVAC so it reads as original construction rather than a bolt-on.
Master suite addition
A bedroom, walk-in closet, and full bath added as one connected suite. It carries more plumbing and framing work than a plain bedroom, so the scope is defined during design.
Kitchen expansion
Push out an exterior wall, remove structural walls with new beams and posts, and rebuild the kitchen with relocated plumbing, gas, and electrical to current code.
Second-story addition
A full or partial second floor on the existing structure. Requires a foundation and framing evaluation, but adds the most square footage without touching the lot footprint.
Detached ADU
A standalone unit in the rear yard with its own entry, kitchen, bath, and utilities — the path with the strongest state-level permitting protections in California.
Garage conversion
Turn an existing garage into permitted living space. The slab, walls, and roof already exist, so the work is structure, insulation, utilities, and finishes.
Still comparing? Read ADU vs. room addition, run numbers in the cost estimator, or see full home additions when the plan involves more than one room.
Design inspirationThe design-build company Angelenos actually recommend.
- ✓Detailed written proposalsDefined scope and itemized allowances after design, plus a written change-order process.
- ✓Coordinated design + permittingDesign, engineering and permit coordination under one contract.
- ✓Permit coordinationPermit coordination with LADBS, LA County and the city building departments in Los Angeles and Ventura counties.
- ✓One project managerOne point of contact from day one.
Common questions from California homeowners.
Straightforward guides on permits, costs, and the build-or-move decision — written by Eli Cohen, HomeAdd's project advisor.
Ready to add square footage? Let's talk today.
Call now for a free feasibility and pricing consultation. No obligation, no pushy sales — just honest numbers and a clear path to permits.
"HomeAdd built a detached ADU on our property and did an excellent job. From the beginning the team took the time to understand what we needed and helped us navigate the design and permitting process. They stayed on budget, communication was top-notch, and the final ADU is a perfect addition to our home."
"They completely transformed my ADU into a beautiful, functional space that now feels like a true home. Incredibly responsive with clear timelines, top-notch craftsmanship, and they really maximized the square footage. I definitely plan to work with them again."
"The full remodel was worth every penny. They kept things moving at a steady pace and stayed on top of details. I walk through the house every morning with a smile on my face."
"The whole process was seamless. The team was very professional, on time every day, kept the worksite clean, and stayed within budget. The office is spacious, well-lit, and modern — one of our favorite rooms in the house."
"Amazed at how quickly they completed our remodel without cutting corners. The kitchen is gorgeous and the bathroom feels so much bigger. Polite and professional the whole way — I'd hire them again in a heartbeat."
Greater Los Angeles, from Ventura to Long Beach.
Headquartered in Woodland Hills, serving the San Fernando Valley, the Conejo Valley, the Santa Clarita Valley, the Westside, Pasadena, the South Bay, Long Beach and southern Ventura County.
The home for additions & ADUs.
- Address
- 22256 Buenaventura St, Woodland Hills, CA 91364
- Phone
- (877) 544-1543
- info@homeadd.com
- Hours
- Mon–Fri · 8:00 AM – 6:00 PM
Start with a free property check.
Tell us about your property and what you want to build. We'll come back with what's possible, what it'll cost, and how long it'll take.
Tell us your address and project goals so we can review the initial feasibility questions with you.