Baldwin Builders ADU projectLicense Verified

Baldwin Builders logoBaldwin Builders

Serving Los Angeles County, Orange County, Riverside County, Covina & more · Based in Covina, CA

Pricing on request — unlock Baldwin Builders's ADU pricing for your project

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Baldwin Builders ADU project 5

About Baldwin Builders

Baldwin Builders (legal entity Baldwin Plumbing Inc.) is a Covina-based, firefighter-owned design-build general contractor that constructs detached, attached, and junior ADUs, garage conversions, and prefab/modular units across Los Angeles, Orange, and Riverside counties. The company holds CSLB license #992380 (class B General Building plus C-36 plumbing and related specialties) and handles permitting and compliance in-house, offering turnkey ADU projects with free consultations. It claims 30+ years of experience, 200+ completed ADUs, and a 4.9-star rating, though those figures are self-reported.

31+ years building ADUs · CSLB 992380 · B — General Building Contractor (also C-36 Plumbing, C-22 Asbestos, C-61/limited specialty, HAZ, ASB)

Baldwin Builders ADU pricing

Pricing varies by unit type, size, finishes, and site conditions. Unlock Baldwin Builders's project pricing for your lot — free, no obligation.

Unit typeTypical sizePricing
Studio / JADU≤ 500 sq ftPricing locked — unlock to view
1-bedroom detached ADU600–750 sq ftPricing locked — unlock to view
2-bedroom detached ADU750–1,000 sq ftPricing locked — unlock to view
Garage conversion400–600 sq ftPricing locked — unlock to view
Attached ADU400–800 sq ftPricing locked — unlock to view

Pricing is unlocked per project

Share a few details and we'll send Baldwin Builders's pricing for your build.

Services Baldwin Builders offers

  • Detached ADUs
  • Attached ADUs
  • Garage Conversions
  • Junior ADUs (JADU)
  • Prefab/Modular ADUs
  • Design-Build

What Baldwin Builders handles

Design & permitting

In-house design and full permit handling.

  • Architectural design & 3D renderings
  • Structural & Title 24 energy plans
  • City plan-check submittal & corrections

Construction

Turnkey ground-up and conversion builds.

  • Foundation & framing
  • Detached, attached & garage-conversion ADUs
  • Electrical, plumbing & HVAC

Financing

Guidance and lender introductions.

  • Renovation / construction-loan guidance
  • HELOC & cash-out refinance referrals
  • ADU-specific (after-build-value) lenders

Project types

ADU formats this builder takes on.

  • Detached ADU
  • Attached ADU
  • Garage / ADU conversion

Warranty & support

What's covered after move-in.

  • Workmanship warranty
  • Manufacturer materials warranties
  • Dedicated project manager

Reviews of Baldwin Builders

4.219 verified reviews
Verified

I have had the pleasure of knowing Tony Ferro, owner of Baldwin Builders, both personally and professionally and I cannot recommend him and his team highly enough. As a longtime property adjuster working specifically with high net-worth clients throughout the Los Angeles area, I know how essential it is to have a contractor who values professionalism, integrity and quality workmanship…Baldwin Builders consistently delivers on all three. Tony and his crew have worked in my own home as well as the homes of many friends recently affected by the Eaton Fire, and all of the feedback has been exceptional. Baldwin Builders is knowledgeable, dependable and extremely communicative, providing timely updates and responding quickly to any questions or concerns. Their attention to detail and commitment to doing the job right is what truly sets them apart. It is rare to find a contractor who combines technical expertise with genuine client care, but Baldwin Builders does exactly that. I will continue to recommend Tony and his team to anyone seeking a trusted, highly-quality general contractor.

carolyn cooney0 found this helpful
Verified

Working with Baldwin Builders was a remarkable experience from start to finish. Their team’s professionalism, attention to detail, and commitment to excellence set them apart from any contractor I’ve worked with. Every phase of construction was executed with precision, clear communication, and a genuine respect for both schedule and budget. They approached our project as if it were their own, solving challenges quickly and maintaining a clean, organized job site throughout. The final product exceeded our expectations — structurally sound, aesthetically flawless, and built to last. Baldwin Builders delivers craftsmanship and integrity that reflect true pride in their work.

Douglas Deyoung0 found this helpful
Verified

Our ADU project with Baldwin Builders was handled with exceptional professionalism and precision. From design coordination through final inspection, their team maintained clear communication, met every deadline, and delivered craftsmanship that far exceeded our expectations. They navigated all city permitting requirements and utility tie-ins with ease, keeping us informed every step of the way. The quality of finishes, attention to detail, and efficiency on-site were outstanding. Baldwin Builders turned what could have been a stressful process into a seamless experience, resulting in a beautiful, high-quality ADU that added tremendous value to our property.

Gianna Frisella0 found this helpful
Verified

I first heard about Baldwin Builders last year when one of my tenants called them while I was out of the country for a wedding in Italy. There was a ceiling leak at one of my rentals, and since I was completely off the grid, they handled it on their own. I’ll admit I was nervous at first, but Tony kept me in the loop, sent photos, and got everything repaired quickly. The work held up great, and the whole experience left a good impression. So when I decided to remodel my own kitchen and hallway bathroom a few weeks ago, I called Baldwin Builders. Once again, everything went smoothly — the crew was professional, finished on time, and the results look amazing. They’ve definitely earned my trust.

Paul Miloknay0 found this helpful
Verified

We used Baldwin Builders for repairs and remodeling at our dental office after a small flood from a broken supply line. Tony and his team were great from start to finish. They worked around our patient schedule, kept noise to a minimum during business hours, and finished everything faster than expected. The drywall and flooring repairs look seamless, and they even helped touch up some older cabinetry so it all matched. Communication was easy and professional — I always knew what was happening each day. It’s hard finding contractors who respect a medical office environment, but Baldwin Builders handled it perfectly. Highly recommend them.

Beverly Hills Dental Center0 found this helpful

Frequently asked questions about Baldwin Builders

What does Baldwin Builders offer?

Baldwin Builders is a full-service ADU builder serving Covina, CA, handling design, permitting, and turnkey construction for detached ADUs, attached ADUs, garage conversions, and junior ADUs (JADUs). Baldwin Builders holds a 4.2-star rating across 19 verified homeowner reviews.

Is Baldwin Builders licensed and insured?

Yes. Baldwin Builders holds an active CSLB license (992380), classified B — General Building Contractor (also C-36 Plumbing, C-22 Asbestos, C-61/limited specialty, HAZ, ASB), and is bonded and insured.

How much does Baldwin Builders charge to build an ADU?

Baldwin Builders prices every ADU per project — your cost depends on size, finishes, and site conditions. Garage conversions are the most affordable path; detached units cost more. Pricing is unlocked per project: request a quote to get Baldwin Builders's exact, no-obligation estimate for your lot.

What areas does Baldwin Builders serve?

Baldwin Builders builds ADUs in Los Angeles County, Orange County, Riverside County, Covina, Santa Monica, Whittier, and surrounding areas.

How long does Baldwin Builders take to build an ADU?

Most ADU projects run 6–12 months end to end — roughly 1–2 months for design and permitting (California caps plan check at 60 days for compliant units) and 4–8 months of construction. Baldwin Builders confirms a timeline for your specific project during the feasibility consultation.

How do I get a quote from Baldwin Builders?

Tap any "Get a Quote" button on this page to share a few details about your property and project. We'll confirm your service area, match you directly with Baldwin Builders, and set up your free feasibility consultation — no obligation.

Where Baldwin Builders works

Covina, CAService-area map
Street View
  • City Building & Safety
  • Planning Department
  • Permit Center

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