ADUs / Room Additions in Hawthorne, CA & the South Bay
An accessory dwelling unit (ADU) or room addition is one of the smartest ways to add living space and property value in Hawthorne, CA. Armenta Construction Inc is an ADU contractor and room addition builder with 20 years of experience navigating South Bay permitting, zoning, and construction. From foundation and framing to electrical, plumbing, and finishes, we build your addition as one seamless project — and we help you plan it so it fits your lot, budget, and goals.
Benefits of Our ADUs / Room Additions
- One contractor for permits, framing, and all trades
- Experience with South Bay and Hawthorne ADU zoning
- Added living space or rental income potential
- Honest planning help before you spend a dollar
- Quality construction that matches your existing home
Common Problems We Solve
- • Need more space for family, a home office, or aging parents
- • Want rental income but don't know where to start with ADU rules
- • Existing layout can't be expanded without a room addition
- • Worried about permits, setbacks, and city requirements
Materials, Methods & Details
- • Attached and detached ADU construction
- • Room additions and second-story expansions
- • Foundation, framing, and roof tie-ins
- • Electrical, plumbing, and HVAC for new space
- • Permitting and inspection coordination
- • Interior finishes, flooring, and painting
Residential ADUs / Room Additions
ADUs and room additions in Hawthorne and the South Bay are almost entirely residential — homeowners adding units for family, rental income, or home offices.
Commercial ADUs / Room Additions
We also build small accessory structures for mixed-use and commercial properties where zoning allows.
Why Choose Armenta Construction Inc for Your ADUs / Room Additions
With 20 years of experience as a general contractor in Hawthorne, CA, Mariano Armenta brings dependable service, honest communication, and quality workmanship to every adus / room additions project. We help you envision and plan each project before we build, and we keep you informed from start to finish. One contractor for your whole project — no juggling multiple companies.
Our Process
- 1
Free consultation — call or request a quote and tell us your goals.
- 2
On-site estimate — Mariano evaluates the scope and gives honest pricing.
- 3
Planning — we help you choose materials, layout, and finishes.
- 4
Construction — our crew executes with quality workmanship.
- 5
Final walkthrough — we make sure you're completely satisfied.
Serving Homeowners Across the South Bay
We provide adus / room additions in Hawthorne and nearby cities. Explore our service area pages for local details:
What Homeowners Say
Trusted by South Bay Homeowners
"Armenta Construction remodeled our entire kitchen and the results were beyond what we imagined. Mariano was honest, on time, and kept us informed every step of the way."
Jessica R.
Hawthorne, CA
"We added an ADU to our property and Armenta handled everything from permits to plumbing. Professional workmanship and fair pricing. Highly recommend."
David M.
Torrance, CA
"Our bathroom remodel turned out beautiful. The crew was clean, respectful, and finished on schedule. We'll be calling them for our next project."
Sandra L.
Manhattan Beach, CA
"New roof and concrete driveway done in one project. Mariano knows his trade and communicates clearly. 20 years of experience really shows."
Robert K.
Gardena, CA