Engineered footings, rebar and anchor bolts, inspected and poured. Hillside, slab or raised, we build the base everything else sits on.
Walls, floor joists and roof rafters go up to the engineer's plan, with shear walls and hold-downs for Southern California seismic code.
Sheathing, house wrap and flashed openings, then the black-framed windows and the pivot entry door. The house is now sealed against the weather.
Underlayment and a standing seam metal roof, installed and flashed by our own crew. Built for heat, Santa Ana winds and fire zones.
Smooth stucco, oak cladding, driveway and drought-tolerant landscaping. The outside is done, and it looks like it belongs on the street.
From the curb to the front door. Every detail you touch daily, the hardware, the threshold, the light, is planned before we build.
Double-height ceilings, white oak floors and floor-to-ceiling glass. Electrical, HVAC and insulation are all hidden behind finish-grade drywall.
A big L-shaped layout around a waterfall-stone center island. Custom cabinetry, paneled appliances and lighting we lay out with you.
A floating oak staircase with frameless glass rail. Structural steel and finish carpentry, built in-house to tight tolerances.
Marble slab walls, a freestanding tub and a walk-in shower. Waterproofed, tiled and plumbed by our own team. High-end finish, done right.
Licensed design-build contractor for custom homes, additions, ADUs and full remodels. Scroll to watch us build a 5,000 sq ft home, step by step.
4.9 Verified on Google · Licensed & Insured1 Smart Build is a licensed, bonded and insured design-build general contractor working across Los Angeles County. We handle the whole job under one contract: measuring and drawing the plans, running them through plan check, pulling the permit, and then building the work with our own supervision on site every day. You are not hiring an architect, then a contractor, then chasing an inspector yourself.
Detached ADUs and garage conversions make up a large share of our work, and they typically run somewhere between $90,000 and $300,000 depending on whether we are converting an existing slab or pouring an entirely new foundation in the rear yard. Kitchen remodels start at $35,000 for a small kitchen, $55,000 for an average-size kitchen, and $80,000 and up for a large kitchen once custom cabinetry, new dedicated circuits and a properly vented range hood are all accounted for, while bathroom remodels start at $18,000 for a guest bath, $28,000 for mid-range, and $58,000 and up for a master suite. Room additions and second stories start around $150,000 and climb from there with the amount of foundation and framing reinforcement the existing house needs, and the same is true of structural work such as foundation replacement and seismic retrofit, where the engineering drives the number far more than the finishes do.
Timelines on almost every one of these projects depend far more on permitting than on the construction itself, which surprises most homeowners the first time they hear it. A bathroom takes roughly four to six weeks of actual work, a kitchen with a load-bearing wall removed is closer to nine or ten weeks, and an ADU or a room addition usually runs six to eleven months from the first drawing to the final inspection because a substantial chunk of that window is city review rather than crews on site. Before you sign anything, we tell you which department will be reviewing your project and roughly how long that particular office is taking right now, so the schedule you agree to is the schedule the city is actually working on.
We work in Woodland Hills, Encino, Sherman Oaks, Studio City, Burbank, Glendale, Calabasas, Pasadena, Santa Monica, the South Bay and everywhere between. Every project is permitted and inspected. If a lot has expansive soil, a hillside grading review, a protected tree or a coastal overlay, we would rather find it during the walkthrough than explain it to you later as a change order.
Real numbers and timelines for Los Angeles, in plain language. Every dollar figure is a 2026 planning range for budgeting, not a quote.
1 Smart Build is a licensed design-build general contractor in Woodland Hills, CA (CSLB #1076428), serving all of Los Angeles County. We design, permit and build residential projects under one contract.
$35,000 to $60,000 for a cosmetic refresh in the same footprint, $60,000 to $100,000 with layout changes, and $100,000 to $180,000+ for luxury design-build. Planning ranges, not quotes.
Bathrooms start at $18,000 for a guest bath, $28,000 for a mid-range full remodel, and $58,000 and up for a master suite.
A garage conversion to a full ADU runs $110,000 to $150,000. An attached ADU of 500 to 750 sq ft runs $150,000 to $260,000. A detached ADU of 600 to 1,200 sq ft runs $180,000 to $350,000.
A bathroom is typically 3 to 4 weeks of construction, a kitchen 4 to 8 weeks. A ground-up custom home in the City of LA is realistically 22 to 34 months including design and plan check.
Yes. Design, structural engineering, LADBS plan check submittal and corrections, inspections and certificate of occupancy are all managed by our team.
Yes. CSLB license #1076428 (Class B, General Building Contractor), a $1,000,000 general liability policy and workers' compensation on file. Anyone can verify the license at cslb.ca.gov.
Call 1 (866) 419-8840 or use the free consultation form on our contact page. We review your scope, timeline and budget at no cost, then visit the property to prepare a fixed-price proposal.
1 Smart Build Inc.
1 (866) 419-8840 info@1smart.build21243 Ventura Blvd #133, Woodland Hills, CA 91364
Free consultation and site walkthrough, no obligation. California CSLB license #1076428, Class B — General Building Contractor.
CSLB License
#1076428
Class B — General Building Contractor
Liability Insurance
$1,000,000
U.S. Specialty Insurance Company
Workers' Compensation
On File
Filed with the CSLB
Client Rating
4.9 / 5
168 verified reviews
Verify our license at the California Contractors State License Board, or read reviews on Google, Houzz, Yelp and BBB.
1 Smart Build is a licensed, bonded and insured Los Angeles general contractor specializing in ADUs, SB9 lot splits, kitchen and bathroom remodeling, room additions, structural and foundation work, and custom new construction. As a full-service design-build firm, we manage design, engineering, permitting and construction under one roof, so homeowners across Los Angeles County and the San Fernando Valley get a single accountable team from foundation to final finishes.
Our office is on Ventura Blvd, so Woodland Hills and Calabasas are our backyard. Need a kitchen remodeler, a bathroom remodel, or a custom home builder? You get a fixed-price proposal from us and one crew that answers for the job from day one.
Attached and detached Accessory Dwelling Units and garage conversions designed, permitted and built under California ADU law to add rental or family space.
Senate Bill 9 lot splits, two-unit developments and parcel maps with full permitting and construction across Los Angeles.
Custom kitchen design-build: cabinetry, stone countertops, islands, tile, lighting and appliance integration.
Full bathroom renovations with custom showers, vanities, tile and spa-grade finishes completed in 3–4 weeks.
Room additions, home extensions and second-story additions that expand living space and home value.
Foundation work, structural framing, seismic retrofits and engineering coordination for safe, code-compliant builds.
Whole-home remodels combining design, demo, MEP, drywall, flooring and luxury finishes.
Ground-up custom home design and construction from foundation to final finishes.
Backyard hardscaping, landscaping, pools and outdoor kitchens for resort-grade outdoor living.
We proudly serve homeowners and investors throughout 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 · Thousand Oaks · West Hills · Bel Air · Pacific Palisades · Topanga · Van Nuys · Reseda · Chatsworth · Granada Hills · North Hollywood · Toluca Lake
The best Los Angeles general contractor is licensed, bonded and insured, offers full design-build service, and shows verified reviews and completed local projects. 1 Smart Build checks every box: a CSLB-licensed design-build firm with a 4.9 Google rating, in-house design, engineering and permitting, and hundreds of completed remodels, ADUs and custom homes across LA County and the San Fernando Valley.
Los Angeles kitchen remodels start at $35,000 for a small kitchen, $55,000 for an average-size kitchen, and $80,000 and up for a large kitchen with custom cabinetry, stone counters and layout changes. 1 Smart Build provides fixed, transparent proposals, with no vague allowances or surprise change orders.
A detached ADU in Los Angeles typically costs $180,000–$350,000 depending on size and finishes, while a garage conversion to a full ADU runs $110,000–$150,000. We handle ADU design, city permits and construction end-to-end under California ADU law.
Bathrooms take 3–4 weeks and kitchens 4–8 weeks of construction, room additions 6–12 months including design and permitting, and ground-up custom homes 22–34 months from first design meeting to final walkthrough. Our clients track schedule, budget and daily progress photos in our automated client portal.
The best home builder combines local permitting experience, in-house design and a verified track record. As a Woodland Hills contractor headquartered on Ventura Blvd, 1 Smart Build designs and builds custom homes, additions and remodels across the Valley, and serves as a trusted general contractor for Calabasas homes just up the road.
1 Smart Build is a full-service kitchen remodeler and bathroom remodeling contractor serving all of LA County. Bathrooms are typically completed in 3–4 weeks with custom showers, vanities and spa-grade tile; kitchens include custom cabinetry, stone counters and layout redesign, all under one fixed-price contract.
Planning a ground-up build? Read our guide: How to Choose a Custom Home Builder in Los Angeles.
Hiring in the Valley? See General Contractor in Woodland Hills: What to Check Before You Hire.
Before hiring any contractor, verify their license on the CSLB Contractor License Check, review permit requirements with LADBS, and check your property's zoning on the City of LA's ZIMAS system.
Ready to compare? Call 1 Smart Build at 1 (866) 419-8840 for a free on-site consultation and a fixed-price proposal from a licensed Los Angeles design-build contractor.
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