What Is ADU Construction?
ADU construction involves planning, permitting, and building a self-contained living space on a residential property , adding value, flexibility, and income potential without buying new land.
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ADU Design & Construction
A second home. A considered plan.
Create space for family, independent living, or a long-term rental with an ADU designed around your property. Uni Construction helps connect the early decisions with drawings, engineering coordination, permitting, and construction under an agreed project scope.
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ADU Design & Construction for your property
ADU Design & Construction for your property
An accessory dwelling unit is a complete small home, and the site around it is part of the design. Its entrance, living spaces, kitchen, bathroom, storage, and building systems need to work together. The first useful question is what kind of home the property can support and what its future occupant needs.
20 years of ADU expertise
Uni Construction works from Diamond Bar with homeowners across Los Angeles and surrounding cities. We can discuss a detached ADU, an attached unit, or conversion of existing space. Design services and construction services should be defined in the proposal so the responsibilities, deliverables, and next decision are clear.
ADU Design & Construction for your property
Review available records, existing buildings, access, grade, and known site restrictions. Identify the reviewing jurisdiction and what information is needed to test a concept. This stage should separate verified information from assumptions that need further investigation.
Trust the process, love your ADU
Develop the unit and its relationship to the existing home together. Compare privacy, entrances, outdoor space, room proportions, utility routes, and maintenance access. Resolve the major choices before committing to a detailed drawing package.
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Need an ADU? We handle everything.
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Feasibility
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Design & Plan
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Permit
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Build
Start with inspiration
Browse ADU floor plans
Coordinate architectural information with the required engineering, energy documentation, and other project disciplines. The agreed scope should state which documents are included, which specialists are involved, and who is responsible for their work.
4 BR | 2 BA
- 1192 SF
- 4 Bed
- 2 Bath
2 BR | 2 BA
- 749 SF
- 2 Bed
- 2 Bath
2 BR | 2 BA
- 800 SF
- 2 Bed
- 2 Bath
2 BR | 1 BA
- 650 SF
- 2 Bed
- 1 Bath
1 BR | 1 BA
- 400 SF
- 1 Bed
- 1 Bath
we handle everything
End-to-end ADU project management
As experienced ADU builders, we make the process easy, handling everything from design to construction with clarity and precision. Our team manages each step to deliver high-quality results and complete peace of mind, so you can simply enjoy your new space.
Before we start building your Accessory Dwelling Unit, we do a detailed feasibility study, evaluating zoning regulations, building codes, and potential red tape to show exactly what’s possible for your property. Whether you envision multigenerational living or a backyard cottage, we align design with legal requirements and your lifestyle goals. Our streamlined process establishes a realistic budget, passive income potential, sets clear expectations, and provides full transparency and confidence for your long-term investment from day one.
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Prepare submissions and respond to review comments within the agreement. When construction is included, use the approved documents and written scope to plan procurement, inspections, changes, and closeout. Submission, approval, and authorization to occupy are distinct milestones.
Forget the complexities of permits and building codes, we handle it all. Our experienced team manages every detail of permit submissions, building department approvals, code compliance, and inspections, ensuring a smooth and swift process that keeps your accessory dwelling unit project on track without delays.
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Your dedicated Project Manager oversees the entire construction process of your ADU. They handle everything from utility integration to final touches. They ensure the project progresses on time, maintains quality, and communicates clearly at every step. Our general contractors deliver high-quality workmanship, bringing your vision to life seamlessly and without surprises.
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Explain who will live in the ADU, the rooms and features required, and your priorities for privacy, maintenance, and future use. Share budget expectations early so options can be compared against a useful brief.
Consider a detached home, garage conversion, or attached arrangement where appropriate. Evaluate what each option changes about the main property as well as what it adds. Record unresolved site questions before choosing a direction.
Maximize your accessory dwelling unit investment by boosting your property value and earning extra income with our comprehensive rental support services. From market analysis and tenant attraction to compliance guidance, we'll help you confidently navigate renting your ADU, ensuring optimal returns, extra income, and minimal stress.
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Advance the preferred concept with dimensions, openings, systems, and required technical details. Confirm selections that affect the documents. Coordinate revisions across disciplines before submission and again when review comments arrive.
ADU design & construction in Los Angeles
Serving homeowners across Los Angeles and surrounding cities, with offices in Diamond Bar, Los Angeles, and Pomona.
Exploring ADU Options
Where should I start with my ADU?
Thinking about an ADU
Not sure if an ADU is right for you? Curious about costs of building, zoning details, or whether you need a feasibility study? We can walk you through the basics and give you a clear picture of your options and the basics of ADUs.Start here to learn the basics
I’m weighing my options
Done some research but still comparing paths? Should you hire separate designers and ADU builders, general contractors, or one trusted design-build partner? Learn why the design-build approach cuts through red tape, saves time, and delivers better value.The design-build difference
I’m ready to build my ADU
If you’re ready to move forward, we’ll make the process seamless. Our team will review your property, handle permits, and create a tailored plan to design and build your ADU, so you can focus on enjoying your new space.Get my custom ADU proposal
ADU Regulations
The easy way to build an ADU is here
Confirm permit conditions, construction inclusions, allowances, exclusions, and access arrangements. Identify procurement decisions and inspection stages. Agree how changes will be documented, then review the required closeout and final approvals at handover.
Smaller ADU setbacks
Allowing you to do more with your property.
Reduced ADU costs
Carrying out cost-effective construction without compromise.
Expedited ADU approvals
Speeding up the permit approval timeline for ADUs.
ADU parking requirements
Alleviating the parking space requirement for ADUs.
Additional ADUs
Supporting both ADUs and Junior ADUs on a single property.
Bigger ADU builds
Greater build sizes Making even larger ADUs possible.ADU INSIGHTS
ADU contractors you can count on
ADU Design & Construction for your property
ADU construction involves planning, permitting, and building a self-contained living space on a residential property , adding value, flexibility, and income potential without buying new land. In California, ADUs now make up about one in six new homes, reflecting their growing role in solving the state’s housing shortage.
ADU Design & Construction for your property
Consider independence, privacy, entry conditions, and practical storage. Discuss future needs while the layout is flexible, especially where an occupant may benefit from easier circulation or a different bathroom arrangement.
ADU Design & Construction for your property
Plan durable finishes, laundry, maintenance access, outdoor separation, and operating responsibilities. Compare a realistic ownership budget separately from projected rent; future occupancy, income, and value are not guaranteed by the design.
ADU Design & Construction for your property
Check the documented use, structure, floor level, and services before assuming a garage or interior area can be reused unchanged. A conversion may retain a footprint while still requiring substantial work to meet residential requirements.
Calculate your
ADU ROI
Our calculator offers a clear look at what your return on investment will be for your ADU project.
Total Return On Your ADU Investment
1,739%
Compare to other investments:
Real Estate
Avg. 6-8%
Stocks
Avg. 5-7%
Savings Account
Avg. 2-4%
Financing your ADU
made simple
We proudly extend flexible financing options to the homeowners we serve, breaking down the full cost of an ADU into manageable payment schedules. Here's how our process works.
1
Easily apply online
Easily apply with our hassle-free online process.
2
Pre-qualify
See if you pre-qualify for an even quicker turnaround.
3
Fast review process
Sit back and relax while we handle the review process.
4
Approval
Receive a notification the moment you’re approved.
Your top ADU questions answered
Answers to your most common ADU building questions.
A useful estimate needs a defined unit, site assumptions, connection scope, specifications, and exclusions. Separate design and approvals, site work, and building construction. Ask which items are fixed, which are allowances, and what has not yet been investigated.
Share the plan source and permission to use it. A preferred layout can be a starting point, but it must be tested against the site and developed into the required documents. A visual plan is not automatically a permit-ready or construction-ready package.
Discuss the services you need and the stage you have reached. A design-only scope differs from a construction agreement. If several parties are involved, identify who coordinates drawings, permit responses, pricing, and changes between them.
Compare the scope as well as the finished-home photos. Ask who develops the design, coordinates engineering, responds to permit comments and manages construction. The best ADU builders for your project should explain their relevant experience, exclusions, communication process and how changes are handled. Uni Construction starts with your property and household goals before defining the agreed work.
An accessory dwelling unit is a complete small home, and the site around it is part of the design. Its entrance, living spaces, kitchen, bathroom, storage, and building systems need to work together. The first useful question is what kind of home the property can support and what its future occupant needs.