What areas does 1 Smart Build serve in Los Angeles?

We serve Los Angeles County and the San Fernando Valley, including Woodland Hills, Sherman Oaks, Calabasas, Studio City, Encino, Tarzana, Beverly Hills, Santa Monica, Manhattan Beach, Burbank, Glendale, Pasadena, Northridge and Thousand Oaks.

Does 1 Smart Build handle ADUs and SB9 lot splits?

Yes. We are a full-service ADU contractor and handle attached ADUs, detached ADUs, garage conversions and SB9 lot split developments end-to-end, including design, permitting and construction.

Are you licensed and insured?

Yes. 1 Smart Build Inc. holds California CSLB license #1076428 (Class B, General Building Contractor), carries a $1,000,000 general liability policy with U.S. Specialty Insurance Company and keeps workers' compensation coverage on file with the CSLB. We manage permits, engineering and inspections for every project.

How long does a typical kitchen or bathroom remodel take?

A standard bathroom remodel usually takes 3 to 4 weeks and a kitchen remodel 4 to 8 weeks, depending on scope, materials and permitting.

Do you offer free consultations and estimates?

Yes. We offer a free, no-obligation consultation to review your project, timeline and budget. Call 1 (866) 419-8840 or submit a request on our website.

Who is the best general contractor for remodeling in Los Angeles?

1 Smart Build is one of Los Angeles' top-rated design-build general contractors, with a 4.9-star Google rating. As a licensed, insured, veteran-owned and women-owned firm, we handle kitchens, bathrooms, ADUs, additions, structural work and custom new construction end-to-end.

Does 1 Smart Build handle design, permits and construction?

Yes. 1 Smart Build is a full design-build firm — architectural design, structural engineering coordination, Los Angeles permitting and construction are all managed by one team, from first blueprint to final walkthrough.

How much does an ADU cost to build in Los Angeles?

ADU costs in Los Angeles vary by size, site conditions and finishes. Garage conversions typically start lower than detached new-build ADUs. 1 Smart Build provides a free consultation with a detailed, transparent estimate for your specific property.

How can I track my remodeling project's progress?

Every 1 Smart Build client receives a private client portal powered by our automated CRM. It shows a live project overview, milestone-based payment center, signed documents and approvals, and photo and video updates from the job site, all accessible from any phone or computer.

Is 1 Smart Build veteran-owned or women-owned?

Yes. 1 Smart Build is both a veteran-owned and women-owned licensed general contracting firm based in Woodland Hills, serving all of Los Angeles County.

Who is the best Woodland Hills contractor for home remodeling?

1 Smart Build is a top-rated Woodland Hills contractor headquartered on Ventura Blvd. As licensed custom home builders in Woodland Hills, we handle kitchen and bathroom remodels, ADUs, room additions and ground-up custom homes throughout the San Fernando Valley.

Do you work as a general contractor for Calabasas homes?

Yes. 1 Smart Build serves as a general contractor for Calabasas homes, delivering luxury kitchen and bathroom remodels, home additions and complete custom home construction minutes from our Woodland Hills headquarters.

What does a kitchen remodel cost in Los Angeles?

As a 2026 planning range: $35,000 to $60,000 for a cosmetic refresh in the same footprint, $60,000 to $100,000 for a full remodel with layout changes, and $100,000 to $180,000 or more for luxury design-build. These are budgeting ranges, not quotes.

What does a bathroom remodel cost in Los Angeles?

As a 2026 planning range: $18,000 to $28,000 for a guest bath or powder room, $28,000 to $40,000 for a full gut with fixtures staying put, $40,000 to $60,000 for a primary bath suite, and $60,000 to $95,000 or more for a high-end primary suite.

What does a room addition cost per square foot in Los Angeles?

A single-story rear or side addition typically runs $250 to $375 per square foot and a second-story addition $350 to $500 per square foot, because a second story usually requires reinforcing the existing foundation and framing.

What does it cost to build a custom home in Los Angeles?

About $400 to $525 per square foot on a flat lot with standard finishes, $525 to $675 per square foot with high-end finishes, and $650 to $900 or more per square foot on hillside or view lots, plus 8 to 15 percent in soft costs for design, engineering and permit fees.

How long does a custom home take to build in Los Angeles?

Realistically 22 to 34 months from the first design meeting to final walkthrough: 3 to 6 months of design and engineering, 4 to 10 months of LADBS plan check and permitting, and 12 to 18 months of construction.

Does 1 Smart Build rebuild homes lost to wildfire?

Yes. Fire rebuild and reconstruction is a core service. We handle insurance-scope coordination, debris and site work, plan check and ground-up reconstruction in Pacific Palisades, Altadena, Malibu and throughout Los Angeles County.

Where can I find bathroom remodeling services near me in Los Angeles?

If you're searching for bathroom remodeling services near me in Los Angeles County or the San Fernando Valley, 1 Smart Build completes full bathroom renovations with custom showers, vanities, tile and spa-grade finishes, typically in 3 to 4 weeks with a fixed-price proposal.

What is 1Smart Build?

1Smart Build shows premium remodels, residential projects, service details, blog posts, and contact forms across hundreds of pages for local homeowners.

Room Addition Contractor Los Angeles

Short Answer

Expect $250 to $500+ per square foot depending on whether you're building out or up, the finishes, and what structural reinforcement the existing house needs.

Typical cost: $250 – $500+ per square foot depending on type and complexity
Typical timeline: 6–12 months including design and permitting
Permits: Permits and inspections handled by us through LADBS or your city building department.
Service area: All of Los Angeles County, including the San Fernando Valley, Westside, South Bay and foothill cities.
Credentials: Licensed, bonded and insured. CSLB #1076428. Owner-operated.

Types of Additions

We build out, up, and into existing space, whichever makes sense for your lot, your budget, and what the city will approve.

Single-story rear and side additions
Second-story additions
Primary suite and bathroom additions
Kitchen expansions and bump-outs
Enclosing patios and converting non-living space

What Drives the Cost

A second story usually costs more per square foot than building out, because the existing foundation and framing often need reinforcement to carry the new load. On a flat lot with room to spare, going out is almost always cheaper than going up.

Foundation and framing reinforcement
Roof tie-ins and re-roofing where they meet
Panel upgrades and HVAC capacity
Hillside and soils reports where applicable

Design, Engineering and Permits

Additions require structural engineering, Title 24 energy compliance, and full plan check. We coordinate the engineer, submit to LADBS or your city, and handle corrections until the permit is issued.

Architectural plans and structural engineering
Setback, FAR and height verification
Title 24 energy calculations
Plan check corrections handled by us

Projects We've Actually Built

Room Additions & Second Stories Jobs, With Real Numbers

Every figure below is from a permitted project we completed in Los Angeles County, not an estimate or an industry average.

Second-Story Addition in Burbank

Cost: $412,000
Duration: 10 months including permitting
Size: 1,050 sq ft added, 2 bed / 2 bath upstairs
Permits: Burbank Community Development, permitted and inspected

Family Room and Bath Addition in Glendale

Cost: $186,000
Duration: 6 months including permitting
Size: 520 sq ft added, family room plus full bath
Permits: Glendale Community Development, permitted and inspected

Room Addition on El Rodeo Rd, Rancho Palos Verdes

Cost: $224,000
Duration: 8 months including permitting
Size: 540 sq ft added, family room plus bedroom
Permits: City of Rancho Palos Verdes, permitted and inspected

Who Does This Work

Isaac Sade, Project Manager

Isaac runs room additions & second stories projects at 1 Smart Build from the first site visit through final inspection: scope, plans, permit submittal, the crews on site, and the walkthrough at the end. You deal with one person who is accountable for the whole job.

Class B — General Building Contractor, CSLB #1076428. Bonded through and insured to $1,000,000 through U.S. Specialty Insurance Company. Rated 4.9 across 168 reviews.

More about Isaac

FREQUENTLY ASKED QUESTIONS

How much does a room addition cost in Los Angeles?

Expect $250 to $500+ per square foot depending on whether you're building out or up, the finishes, and what structural reinforcement the existing house needs.

Is it cheaper to build out or add a second story?

Building out is usually cheaper if your lot has room, because a second story often requires reinforcing the existing foundation and framing to carry the added load.

How long does a room addition take?

Plan on 6 to 12 months total: design and engineering, plan check at the city, then 3 to 6 months of construction depending on size.

Do you build home additions near me outside the City of Los Angeles?

Yes. We build primary suite additions, second stories and house extensions across a 100-mile radius of Woodland Hills, the San Fernando Valley, Ventura County, the Westside, the South Bay and Orange County. Each city runs its own plan check, and we handle whichever one governs your parcel.

Areas We Serve

1 Smart Build provides room additions & second stories services within a 100-mile radius of our Woodland Hills office, covering Los Angeles County, Ventura County, Orange County and the surrounding region. Homeowners searching for a remodeling contractor near me regularly hire us in:

Don't see your city? View all service areas or give us a call, if you're within 100 miles, we build there.

Free Consultation

DISCUSS YOUR PROJECT WITH 1 SMART BUILD

Licensed, bonded and insured design-build general contractor serving Los Angeles County and Southern California. Tell us about your property and goals, and we'll walk you through feasibility, permitting and a clear plan.

1 (866) 419-8840

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Also Explore

ADU & Garage ConversionConstruction in as few as 120 working days once permits are issued; 8–14 months from first site visit to final inspection Structural, Foundation & Framing2 weeks to 4 months depending on scope SB9 Lot Splits & Two-Unit Development12–24 months including entitlement and permitting

ROOM ADDITION CONTRACTOR IN LOS ANGELES