ADU Builders & Home Addition Contractors in California
Design-build ADUs, garage conversions, and home additions — from first sketch to final keys, under one contract.
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. The most 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.
ADUDetached ADU
A standalone backyard home — up to 1,200 sq ft, its own address, real rental income.
View Detached ADU details
ADUAttached ADU
New living space seamlessly bolted to your existing home — shared wall, separate life.
View Attached ADU details
ConvertGarage Conversion
The fastest, most cost-effective path to permitted living space in LA.
View Garage Conversion details
ADUAbove-Garage ADU
Stack a second-story unit over your garage — square footage without giving up yard.
View Above-Garage ADU details
JADUJunior ADU (JADU)
Up to 500 sq ft carved inside your existing home — the simplest permit path.
View Junior ADU (JADU) details
AddRoom Addition
One more bedroom, an office, a nursery — added to your existing footprint.
View Room Addition details
ExpandHome Addition
Second stories, full wings, kitchen expansions — significant square footage.
View Home Addition details
ExpandSecond-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. No surprise invoices.
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 LADBS, LA County, and OC building departments end-to-end. You just approve.
Build & handoff
One project manager, weekly walkthroughs, 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.
The design-build company Angelenos actually recommend.
- ✓Detailed written proposalsDefined scope and itemized allowances after design, plus a written change-order process.
- ✓Coordinated design + permittingNo architect ping-pong. No permit runaround.
- ✓Local specialistsWe work with LADBS, LA County, OC, and Ventura building departments regularly.
- ✓One project managerWeekly walkthroughs and one point of contact from day one.
Serving three Southern California counties.
One coordinated design + build team across LA, Orange, and Ventura — matched to each city or county's permit path.
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.
5.0 on Google.
"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."
LA, Orange County, and Ventura.
Headquartered in Woodland Hills, serving the San Fernando Valley, the Westside, South Bay, most of Orange County, and Conejo Valley.
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.
Our 60-second project qualifier collects the details we need to give you an honest first answer. HomeAdd typically responds within one business day.