We're a licensed design-build contractor serving all of Los Angeles County. Custom homes, room additions, and full remodels. We design it, permit it, and build it ourselves, and we stand behind the work.
See an overview of home construction, from site preparation to finishes.
Site preparation begins with surveying, grading and marking the building footprint.
Trenches, formwork and rebar go in, then the slab is poured and troweled smooth.
Studs, joists and rafters rise piece by piece as window and door openings take shape.
Roofing, windows, doors and exterior finishes close in the structure.
An open kitchen and living area with large windows and an island.
A bathroom layout with stone surfaces, an oak vanity and a freestanding tub.
See the main stages of home construction.
Years of building in LA have taught us one thing: the details are everything. We handle the design, the permits, and the construction ourselves, so nothing gets lost between teams, and you always know exactly where your project stands.
We work with LA's building codes, permit offices, and architectural styles every day.
We sweat the details you'll live with every day, and the ones you'll never see.
Practical decisions that keep your project on schedule and on budget.
Your goals set the plan, and you'll always know where your project stands.
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.
Explore The Site
Every service, city and cost guide we publish is one click away. Pick the work you are planning, the city your property sits in, or a real project with its budget and timeline attached.
Check Us Out Yourself
You should never take a contractor's word for it, so here is where to confirm everything we claim. These links open our public records on the state license board, review platforms and the city building department.
Real numbers and timelines for Los Angeles, in plain language. Every dollar figure is a 2026 planning range for budgeting, not a quote.
Design ideas to help you picture the work. Choose a service to learn about what's involved.
New cabinets, counters, lighting and layouts, with the plumbing and electrical work handled too.
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Showers, tubs, vanities and tile, with proper waterproofing and ventilation.
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Add a separate living space. We handle the plans, permits and construction.
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Foundation repairs, structural reinforcement and framing based on engineered plans.
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Renovate several rooms or the whole house with one team managing the work.
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Find out whether your lot qualifies for a split and additional homes under SB9.
Request a QuoteSenate Bill 9, SB9 Services
California's SB 9 law lets many single-family homeowners split their lot and build up to two units on each new parcel, subject to the law's zoning, fire-hazard, historic and tenant-history exclusions. 1 Smart Build is one of the few Los Angeles general contractors offering the entire SB9 process under one roof, feasibility, lot split, design, permitting and construction.
Many single-family lots in Los Angeles qualify under SB 9, but eligibility depends on zoning, lot size, fire-hazard zone, historic status, tenant history and other statutory exclusions. Our free feasibility review checks your parcel against each requirement before you spend a dollar.
We manage the urban lot split application, parcel map, surveys and city approvals end-to-end, turning one lot into two sellable parcels.
As a licensed design-build contractor, we design the new units, pull LADBS permits and build up to two homes per parcel, one team, start to finish.
Build to sell, rent or house family. We model the numbers with you so the project pencils out before ground breaks.
01We meet at your property, discuss your goals and prepare plans and an itemized estimate.
02We coordinate the engineering, permit applications and inspections your project needs.
03Your project manager coordinates the crews and keeps you updated on progress and schedule changes.
04We review the finished work with you, address the punch list and provide the inspection and warranty documents.
Every 1 Smart Build client gets a private portal powered by our automated CRM. From your phone or computer, you always know exactly where your project stands, with no chasing and no guessing.
Schedule, milestones, and daily progress. Everything about your project in one place, updated in real time.
A clear payment schedule tied to milestones. See what's paid, what's next, and pay securely online.
Contracts, permits, plans, and change orders, organized, signed, and always accessible.
Watch your project come to life with photo and video updates from the field, from demo day to final reveal.
A real example of what every homeowner receives.
The experience was exceptional from start to finish. They took my vague ideas and turned them into a sleek, functional design. Every staff member showed up on time, consistently. The attention to detail in the tiling and fixture installation is flawless.
I cannot recommend 1 Smart Build enough. From the first consultation to the final walkthrough, the entire process was professional, transparent, and stress-free. The attention to detail on the cabinetry and tiling is second to none. My kitchen is the centerpiece of my home.
Their expertise in the structural phase was evident. They handled the framing and foundation with such precision that the inspectors were even impressed. They kept me in the loop through every phase. It's clear they don't cut corners.
From the initial design and permitting to the final walkthrough, incredible professionalism. Every staff member showed up looking sharp and ready to work. The quality of the build is absolutely top-tier. Our new ADU feels like a seamless extension of our home.
We pay attention to the finish details and the work behind the walls.
We help you choose materials and layouts that suit your home and budget.
You get a written scope and updates on costs, scheduling and changes.
We manage design, permits and construction through the final walkthrough.
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
162 verified reviews
Verify our license at the California Contractors State License Board, or read reviews on Google, Houzz, Yelp and BBB.
We proudly serve all of Los Angeles County, including Woodland Hills, the San Fernando Valley, and surrounding communities, with deep knowledge of local building standards and architectural styles.
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 5.0 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 $150,000–$400,000 depending on size and finishes, while garage conversions often start around $120,000. We handle ADU design, city permits and construction end-to-end under California ADU law.
Bathrooms take 3–4 weeks, kitchens 6–10 weeks, room additions 3–5 months, and ground-up custom homes 10–16 months including permitting. 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.
The Command CenterFrictionless, high-intent lead capture. Tell us about your project and our team will reach out to schedule your free consultation.
Call Direct1 (866) 419-8840Email Usinfo@1smart.buildOur office sits right on Ventura Blvd, minutes from Calabasas, Tarzana and Encino. Stop by to talk through your plans in person, or tap for directions and we'll see you soon.
Address
21243 Ventura Blvd #133, Woodland Hills, CA 91364
Hours
Open 7 days a week, by appointment
Phone
1 (866) 419-8840
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