Handover day
Rosemead, CA
Detached two-story ADU with a private balcony
- Size
- 1,188 sq ft
- Layout
- 3 bed · 2 bath
- Type
- Two-story, detached
Big living, small footprint · Licensed design-build
Orange CountyADU builder.Accessory Dwelling Unit (ADU) Design-Build Contractor
Orange County’s licensed ADU builder and accessory dwelling unit contractor, also serving Los Angeles. We design, permit, and build turnkey backyard homes end-to-end. ADUs that add income, space, and value.
Materials & partners we build with
200+projects completed
400–1,200sq ft floor plans
12floor plans to explore in 3D
1contract, from design to keys
What we do
We design custom, permit-ready ADUs and build them in months, not years.
Completed projects
FramingFeb 2025Finished2025
ADUs we have designed and built.
Video and photos from our own job sites and handover day, not renderings. Built by our own crews.
FramingFeb 2025Finished2025Pasadena, CA
Single-story ADU with a vaulted ceiling. Drag to see framing to finish.
- Size
- 700 sq ft
- Layout
- Single story
- Completed
- 2025
What homeowners say
“Their price wasn’t the lowest, but it listed everything.”
John, homeowner in Orange, CA, in his own words.
800 sq ft attached ADU
Real 3D, every plan
See your ADU from every angle.
- LSQ 1200 · 1,200 sq ftEvery plan is a real 3D model, built to scale.
- 3 bedrooms · 3 bathsTurn it, open it up, see how every room connects.
- Step insideWalk the living room before the first nail.
Floor plans · 3D Design Studio
Pick a plan. See it three ways.
12 floor plans from 400 to 1,200 sq ft. Read the layout, step into the finished rooms, then walk through it in 3D.
From the 3D studio
Single story
LSQ 900
- Living area
- 900 sq ft
- Bedrooms
- 2
- Bathrooms
- 2
- Footprint
- 45' × 20'
How it works
From first call to front-door key.
Three stages, one team. You always know what happens next and roughly when.
- 01Week 1–2 · Free
Free consultation & site visit
We talk goals, budget and timeline, then walk the lot: access, utilities, setbacks and sun. You leave knowing what your property can legally hold.
- 02Week 2–13
Design & permits
We draw your plan and 3D views, refined with you until it is right. Then we submit and clear every city correction.
Our LSQ 900 plan - 03Month 4–8
Build & move in
Our own crews build it, through final inspection, walkthrough and keys.
Pasadena: framed Feb 2025, finished 2025
Why L Square
One team. One contract. No hand-offs.
Designed around your lot
Every unit is drawn around your lot, light and privacy.
Permit-ready plans
Pre-designed floor plans and Orange County and Los Angeles experience keep the city review moving.
Built by our own crews
Our own crews build it, foundation to finishes.
Finished to move-in
Hand-picked finishes and appliances, down to a real front-door key.
Meet the owner
Kiko Zhou
Owner · General Contractor
One team from the first sketch to the final inspection, so nothing gets lost between a designer and a builder.
Owner and General Contractor with an interior design background, UC Irvine. Kiko brings design sensibility and local market expertise to every build, so each ADU lives well and adds real property value.
- 200+projects completed across OC and LA
- CSLBLicensed, insured and bonded · #1095476
- UC IrvineInterior design background
Choose your build path
One ADU contractor. Every build path.
Looking for an ADU contractor or ADU builder? Start with the path that matches the property: a coordinated design-build, a custom ADU, or a garage conversion.
01
ADU Contractor
One team coordinates feasibility, design, permits, and construction under one contract.
See the design-build process →02ADU Builder
Build a detached or attached custom ADU around your lot, layout, privacy, and goals.
Explore custom ADUs →03ADU Construction
Turn an existing garage into a legal living space with coordinated utilities, finishes, and inspections.
See garage conversion options →Get started
More home. Same lot.
Tell us where you are and we'll come back with what's possible on your property: a ballpark, and the next step. No pressure.
- Call(949) 374-7980
- Emailinfo@lscontractor.com
- Based inSanta Ana, Orange County
Kiko Zhou · OwnerReplies within one business day
Get your free estimate
Tell us about the property. We reply within one business day with what your lot can hold and the next step.
- Free site visit
- No obligation
- Licensed & insured
Prefer to talk? Call (949) 374-7980
Areas we serve
Orange County and Los Angeles.
As a licensed ADU builder and accessory dwelling unit contractor, L Square designs, permits, and builds custom ADUs, garage conversions, and granny flats across Orange County and Los Angeles, working from our home base as an ADU builder in Santa Ana.
IrvineNewport BeachSanta AnaAnaheimCosta MesaHuntington BeachMission ViejoLake ForestLaguna HillsLaguna BeachTustinYorba LindaLong BeachRiversideLos Angeles
Explore: ADU Guide Services Cost Guide Permit Guide ADU in Los Angeles Custom ADU Garage Conversion Detached ADU Granny Flat In-Law Suite ADU Design-Build View all areas →
What is an ADU, and why should you build one?
An accessory dwelling unit (ADU) is a small, independent living space on your property. It’s ideal for rental income, guest housing, or an in-law suite for family members.
How much does it cost to build an ADU in Los Angeles?
Costs vary based on size and design. Our ADU cost calculator provides an estimate, and as a trusted ADU construction company, we offer accurate quotes and financing options.
Can you convert a garage into an ADU?
Yes. A garage conversion is one of the ADU types we build, usually about 4 to 5 months from the first site visit to final approval. A city cannot require you to replace the parking the garage provided, and we quote each conversion after a site visit.
How do you estimate the cost of a home addition?
Use our home addition cost estimator or construction price calculator for an estimate. Our ADU design-build team in Orange County provides customized solutions to fit your budget.
Do you build ADUs in Los Angeles and Orange County?
Absolutely! We specialize in ADU projects in Los Angeles and Orange County, creating efficient and stylish living spaces.
What are the benefits of working with an ADU contractor in Los Angeles?
A professional ADU contractor in Los Angeles, like LScontractor, ensures compliance with city regulations, high-quality construction, and efficient project management. We handle everything from custom ADU designs in Orange County to final inspections.
Do you build backyard cottages and cabins in Los Angeles?
Yes! We design and build cabins in Los Angeles and Orange County, as well as backyard cottages for homeowners seeking extra space or rental opportunities.