



NEW FOUNDATION
Engineered footings, rebar and anchor bolts, inspected and poured. Hillside, slab or raised, we build the base everything else sits on.
STRUCTURAL FRAMING
Walls, floor joists and roof rafters go up to the engineer's plan, with shear walls and hold-downs for Southern California seismic code.
WINDOWS AND DOORS
Sheathing, house wrap and flashed openings, then the black-framed windows and the pivot entry door. The house is now sealed against the weather.
ROOFING
Underlayment and a standing seam metal roof, installed and flashed by our own crew. Built for heat, Santa Ana winds and fire zones.
EXTERIOR FINISHES
Smooth stucco, oak cladding, driveway and drought-tolerant landscaping. The outside is done, and it looks like it belongs on the street.
STEP INSIDE
From the curb to the front door. Every detail you touch daily, the hardware, the threshold, the light, is planned before we build.
OPEN LIVING SPACE
Double-height ceilings, white oak floors and floor-to-ceiling glass. Electrical, HVAC and insulation are all hidden behind finish-grade drywall.
L-SHAPED CHEF'S KITCHEN
A big L-shaped layout around a waterfall-stone center island. Custom cabinetry, paneled appliances and lighting we lay out with you.
UP THE STAIRS
A floating oak staircase with frameless glass rail. Structural steel and finish carpentry, built in-house to tight tolerances.
MASTER BATHROOM
Marble slab walls, a freestanding tub and a walk-in shower. Waterproofed, tiled and plumbed by our own team. High-end finish, done right.
WE BUILD LOS ANGELES HOMES,
FROM THE GROUND UP
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 & InsuredWHAT WE BUILD, WHAT IT COSTS, AND HOW LONG IT TAKES
1 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.
THE QUESTIONS EVERYONE ASKS
Real numbers and timelines for Los Angeles, in plain language. Every dollar figure is a 2026 planning range for budgeting, not a quote.
Who is 1 Smart Build?
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.
What does a kitchen remodel cost in Los Angeles?
$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.
What does a bathroom remodel cost in Los Angeles?
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.
What does an ADU cost in Los Angeles?
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.
How long does a remodel take?
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.
Do you handle permits and engineering?
Yes. Design, structural engineering, LADBS plan check submittal and corrections, inspections and certificate of occupancy are all managed by our team.
Is 1 Smart Build licensed and insured?
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.
How do I get a free estimate?
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.
WHAT SERVICES DOES 1 SMART BUILD OFFER IN LOS ANGELES?
HOW DO I CONTACT 1 SMART BUILD?
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.
LICENSED & INSURED. CHECK IT YOURSELF.
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.
LOS ANGELES DESIGN-BUILD GENERAL CONTRACTOR
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.
ADUS & GARAGE CONVERSIONS
Attached and detached Accessory Dwelling Units and garage conversions designed, permitted and built under California ADU law to add rental or family space.
SB9 LOT SPLIT & URBAN LOTS
Senate Bill 9 lot splits, two-unit developments and parcel maps with full permitting and construction across Los Angeles.
KITCHEN REMODELING
Custom kitchen design-build: cabinetry, stone countertops, islands, tile, lighting and appliance integration.
BATHROOM REMODELING
Full bathroom renovations with custom showers, vanities, tile and spa-grade finishes completed in 3–4 weeks.
ROOM ADDITIONS & SECOND STORIES
Room additions, home extensions and second-story additions that expand living space and home value.
STRUCTURAL, FOUNDATION & FRAMING
Foundation work, structural framing, seismic retrofits and engineering coordination for safe, code-compliant builds.
COMPLETE HOME REMODELS
Whole-home remodels combining design, demo, MEP, drywall, flooring and luxury finishes.
CUSTOM NEW CONSTRUCTION
Ground-up custom home design and construction from foundation to final finishes.
OUTDOOR LIVING & HARDSCAPING
Backyard hardscaping, landscaping, pools and outdoor kitchens for resort-grade outdoor living.
AREAS WE SERVE
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