Construction Company
Your Full-Service Construction Company — Design-Build, ADUs & Commercial Projects
Uni Construction is a design-build contractor delivering residential and commercial construction services — from accessory dwelling units and home additions to tenant improvements and owner’s rep engagements. One firm, every phase, built right the first time.
Why Uni Construction
Why Property Owners Choose Uni Construction as Their Design-Build Contractor
Most construction companies hand you a bid and start swinging hammers. The best ones understand the full lifecycle of a project before the first nail is driven. That is the difference Uni Construction brings to every engagement.
With more than twenty years of preconstruction, cost management, and construction delivery experience across institutional and residential projects throughout California, our team operates as both your design-build contractor and your construction advocate. We manage architectural coordination, engineering, permitting, budgeting, and field execution within a single accountable team — so you never find yourself mediating between an architect who does not understand costs and a contractor who did not read the plans.
Whether you are a homeowner building an ADU, a property investor planning a multi-unit addition, or a business owner renovating a commercial space, Uni Construction functions as the construction company near me that actually delivers — on scope, on schedule, and on budget.
Value Points:
- Integrated design-build delivery — architecture, engineering, and construction under one roof
- Preconstruction cost analysis before you commit to a scope or a number
- Deep knowledge of California building codes, Title 24, and local zoning requirements
- Owner's rep and construction management capabilities for complex projects
- Transparent fixed-fee proposals with no change-order surprises
ADU Contractor
ADU Contractor — Every Configuration, From Design Through Certificate of Occupancy
Uni Construction is a specialized ADU contractor delivering turnkey accessory dwelling unit projects — not just plans, but complete design-build execution from feasibility through final inspection. We handle site evaluation, architectural design, structural engineering, permitting, and construction so your ADU is built right, approved fast, and ready for occupancy.
Detached ADU
New stand-alone structures built on your lot — up to 1,200 square feet under current California ADU law. We design for setback compliance and utility connections, then build with cost-controlled framing, mechanical, and finish packages that maximize livable area without exceeding your budget.
Attached ADU
Additions that connect directly to your primary dwelling. Our design-build approach maintains the structural integrity of the existing home while constructing a fully independent living unit with its own entrance, kitchen, and bathroom — permitted and inspected as a single coordinated project.
Garage Conversion
Transform an existing one- or two-car garage into a permitted accessory dwelling unit. We manage foundation upgrades, insulation, ventilation, window egress, and parking replacement requirements — handling both the design documentation and the physical construction within your current building footprint.
Junior ADU (JADU)
Units of 500 square feet or less carved from the existing footprint of your primary residence. JADUs are among the most cost-effective ways to add a rental unit or multi-generational living space. Our construction team delivers these compact conversions efficiently, with minimal disruption to your daily routine.
Existing Floor Conversion
Repurpose underused interior space — a bonus room, basement area, or unused wing — into a code-compliant ADU. We evaluate structural capacity, egress paths, plumbing access, and fire separation, then execute the conversion from demolition through finish work and final city inspection.
Residential Construction
Full-Service Construction Company for Home Additions, Remodels & Renovations
Beyond ADU projects, Uni Construction delivers complete residential construction services — from room additions and kitchen renovations to whole-house remodels and coordinated plan set development. Every project is managed under our design-build model so design intent carries cleanly into construction execution.
01 — Home Addition & Room Addition Construction
Expand your living space with a second story, rear extension, or side addition. We produce architectural layouts, structural plans, and Title 24 energy calculations, then build the addition with our own crews — ensuring the finished product matches the approved drawings down to the last detail.
02 — Kitchen & Bathroom Remodel Construction
Functional layouts that balance aesthetics with plumbing, electrical, and ventilation realities. Our team produces detailed floor plans and specification sheets, then executes the demolition, rough-in, and finish work so you deal with one company from concept through completion.
03 — Residential Renovation Planning & Execution
Whole-house or phased renovation scopes, documented from demolition plans through finish schedules and then built by our field teams. We coordinate structural engineers, energy consultants, and trade subcontractors to deliver a complete project that satisfies city reviewers and exceeds your expectations.
04 — Site Planning & Zoning Review
Before a single line is drawn, we evaluate your lot against current zoning overlays, setback requirements, lot coverage limits, height restrictions, and parking ratios. This upfront analysis prevents costly redesigns and ensures your project is buildable as designed — saving time and money before construction begins.
05 — Coordinated Plan Sets — Drafting, Permitting & Structural Input
One unified plan set that includes architectural drawings, structural details, Title 24 reports, and site plans — ready for city submittal. No chasing separate consultants, no conflicting details, no wasted revision cycles. This is what a true design-build contractor delivers as standard practice.
Commercial Construction & Owner's Rep
Tenant Improvement Contractor & Owner's Rep Construction Services
Uni Construction extends the same integrated delivery model to commercial projects. As a tenant improvement contractor, we handle office build-outs, retail renovations, and workspace reconfigurations from lease negotiation support through certificate of occupancy. As an owner’s rep for construction projects across Southern California, we protect your interests on complex developments where independent oversight makes the difference between a project that delivers and one that drifts.
Tenant Improvement Construction
Whether you are building out a new lease space or reconfiguring an existing commercial interior, our team manages demolition, MEP coordination, ADA compliance, fire-life-safety systems, and finish work. We deliver tenant improvement projects that meet your operational timeline and budget — with design-build efficiency that eliminates the gaps between your architect, engineer, and general contractor.
Owner’s Rep & Construction Management
For property owners, investors, and developers managing larger or more complex projects, Uni Construction provides owner’s representative and construction management services. We oversee contractor selection, budget tracking, schedule management, pay application review, and quality assurance on your behalf — bringing two decades of institutional preconstruction experience to protect your investment from pre-development through project closeout.
Our Process
How Our Construction Company Works With You
We have refined a five-phase process that keeps residential and commercial projects on track from the initial conversation through construction completion.
Step 1 — Discovery & Site Review
We assess your property, review zoning constraints, and define the project scope and preliminary budget before any design work begins.
Step 2 — Concept & Layout Design
Preliminary floor plans and site layouts are developed, reviewed with you, and revised until the design matches your vision, your budget, and your timeline.
Step 3 — Construction Documentation & Permitting
Full plan sets with architectural, structural, and energy compliance details — coordinated and packaged for city submittal. We manage the plan check correction process to keep your permit on track.
Step 4 — Construction Execution
Our field teams and vetted trade partners build your project with the same precision that went into the design. Weekly progress updates, clean job sites, and proactive issue resolution are standard.
Step 5 — Final Inspection & Project Closeout
We coordinate final city inspections, punch list completion, and project handoff — ensuring every detail is resolved before you take occupancy.
Ready to Work With a Construction Company That Gets It Right the First Time?
Request a free project consultation. We will review your property, scope your project, and provide a clear proposal — typically within 48 hours.
Service Area
Construction Company Serving the San Gabriel Valley & Greater Los Angeles
Uni Construction serves homeowners, property investors, business owners, and developers throughout Los Angeles County. Our team has completed ADU, addition, remodel, tenant improvement, and commercial construction projects in dozens of jurisdictions across the region.
Cities Served:
· Los Angeles
· Diamond Bar
· Pasadena
· West Covina
· Alhambra
· Arcadia
· Rosemead
· Temple City
· Glendora
· Covina
· Monrovia
· El Monte
· Hacienda Heights
· Rowland Heights
· Walnut
· Pomona
· San Dimas
· La Verne
· Azusa
· Whittier
· Downtown Los Angeles
FAQ
Frequently Asked Questions
Common Questions About Our Construction Company
Q: What makes Uni Construction different from other construction companies near me?
A: Most construction companies operate as either a design firm or a build firm — rarely both. Uni Construction is a fully integrated design-build contractor that manages architectural design, structural engineering, energy compliance, permitting, and construction execution within a single team. This eliminates the communication breakdowns, cost overruns, and schedule delays that property owners typically experience when coordinating three or four separate consultants and contractors. Combined with over twenty years of preconstruction and cost management experience on major California projects, we deliver buildings that are designed for real-world budgets and built to the standard shown on the approved plans.
Q: What types of ADU projects can your ADU contractors handle?
A: We design and build all five ADU configurations recognized under California law — detached ADUs, attached ADUs, garage conversions, junior ADUs (JADUs), and existing floor conversions. Each project type has distinct zoning, setback, utility, and structural requirements. As a specialized ADU contractor, our team has completed hundreds of accessory dwelling unit projects across multiple jurisdictions throughout Southern California, handling every phase from feasibility study through certificate of occupancy.
Q: Do you provide tenant improvement construction for commercial spaces?
A: Yes. As a tenant improvement contractor, we deliver office build-outs, retail renovations, and workspace reconfigurations from initial space planning through construction completion and final inspection. Our design-build approach means your architect, engineer, and builder are one coordinated team — so your tenant improvement project stays on schedule and within the budget your lease economics require.
Q: What does your owner's rep construction service include?
A: Our owner’s rep construction service provides independent oversight and advocacy for property owners, investors, and developers on complex projects. This includes contractor procurement and selection, budget development and tracking, schedule monitoring, pay application review, quality assurance inspections, and dispute resolution support. We bring two decades of institutional preconstruction experience to protect your investment from the earliest planning phases through project closeout — functioning as an extension of your team without the overhead of a full-time hire.
Q: How does the design-build contractor model benefit my project?
A: The design-build model places design responsibility and construction accountability under one contract and one team. This means your budget is validated during design — not after bids come back higher than expected. It means your drawings reflect what can actually be built efficiently, not just what looks good on paper. And it means schedule commitments are realistic because the people who drew the plans are the same people who will build from them. For homeowners and business owners alike, design-build eliminates the adversarial dynamic between architect and contractor that drives up costs and extends timelines on traditionally delivered projects.
Q: What areas does your construction company serve?
A: We serve homeowners, property investors, and business owners throughout Los Angeles County with a concentration in the San Gabriel Valley — including Diamond Bar, Pasadena, West Covina, Alhambra, Arcadia, Rosemead, Temple City, Glendora, Covina, Hacienda Heights, and surrounding communities. We also take on projects across broader Los Angeles County and Southern California when the scope and location are a good fit for our team.
Contact
Together, We Shape the Extraordinary
Interested in working with us? Let’s bring your space to life.