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.
Build a 5,000+ sq. ft. Los Angeles home phase by phase, then step inside.
A staked, graded lot on a quiet Los Angeles street on day one of the job.
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, stucco and siding install into their exact openings.
Step inside 22-foot ceilings, a glass wall and a 16-foot waterfall island.
Book-matched marble, a floating oak vanity and a sculptural freestanding tub.
Watch the build come alive, then walk inside.
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 usually land between $65,000 and $110,000 once custom cabinetry, new dedicated circuits and a properly vented range hood are all accounted for, while bathroom remodels generally fall between $34,000 and $60,000 per room. 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.
Showcase craftsmanship through a non-linear architectural lens. Each project is engineered from the ground up.
Engineered culinary experiences balancing aesthetic brilliance with structural integrity.
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Spa-like primary retreats blending high-end aesthetics with technical precision.
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Seamless accessory dwelling units and conversions from design to permitting.
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Footings, foundations, and framing handled with inspector-impressing precision.
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Split your lot and build up to four homes under Senate Bill 9, permits included.
Request a QuoteSenate Bill 9 — SB9 Services
California's SB9 law lets most single-family homeowners split their lot and build up to two units on each new parcel. 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.
We check your parcel's zoning, lot size and eligibility under Senate Bill 9 before you spend a dollar — most single-family lots in Los Angeles qualify.
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.
Free on-site consultation. We translate your ideas into architectural plans, 3D concepts, and a transparent line-item estimate.
We handle every LA County permit, structural calc, and city inspection, including SB 9, ADU, and hillside expertise included.
A dedicated project manager, licensed crews, and daily progress updates through your client portal. No surprises.
White-glove punch list, final inspections passed, and warranty in hand. We don't leave until you love it.
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.
Every detail is handled by our professional team, recognizable in signature black polos and blue jeans.
We integrate the latest building science to maximize efficiency and durability.
A streamlined process that keeps you informed at every milestone, with no hidden costs, no surprises.
Consultation, execution, delivery. A roadmap from blueprint to final walkthrough.
CSLB License
#1076428
Class B — General Building Contractor
Liability Insurance
$1,000,000
U.S. Specialty Insurance Company
Contractor Bond
$15,000
Old Republic Surety Company
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.
Headquartered on Ventura Blvd, we're the go-to Woodland Hills contractor and a trusted general contractor for Calabasas homes. Whether you're searching for a skilled kitchen remodeler, bathroom remodeling services near me, or the best home builder for your project, our team of custom home builders in Woodland Hills delivers fixed-price proposals and a single accountable crew 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.
Most Los Angeles kitchen remodels range from $35,000 for a quality mid-range refresh to $120,000+ for a full luxury design-build 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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