Skip to content
FeaturedVerifiedRenovation Contractors in Garden Grove, California

Osh Construction

Featured in Garden Grove Today 5.00 (13 reviews)(949) 244-2998

Osh Construction is a Garden Grove general contractor for new construction and remodeling. Founder Orlando Sergio Hernandez established the company in 2015. Its project process includes a group chat for questions and concerns, plus daily updates with photos.

Business Highlights
  • OSH Construction lists license no. 1005707 and says it is bonded.
  • OSH Construction offers a warranty for all services provided.

Service Area

California.

Featured on ProsGrade. Osh Construction is one of 6 renovation contractors ProsGrade lists in Garden Grove, California.

Listing details

5 services listed, including ADUs, Kitchen remodeling and Bathroom remodeling. Open Monday to Saturday. Rated 5.0 from 13 reviews.

  • Verified listing details
  • Service information
  • Customer review signals
  • Photo gallery
  • Public contact information
  • Published local profile

How This Business Compares

How Osh Construction compares with the other 5 renovation contractors on ProsGrade in Garden Grove, using public Google ratings and review counts.

  • Ranks in the top half of the 6 Garden Grove renovation contractors on ProsGrade by Google rating and review volume.
  • Rated 5.0 on Google, at or above the 4.8 average of other Garden Grove renovation contractors on ProsGrade.
  • Has more Google reviews (13) than 3 of the 5 other Garden Grove renovation contractors on ProsGrade.
  • One of 4 Garden Grove renovation contractors on ProsGrade rated 4.7 or higher from at least 10 reviews.

Services Covered

5 services
  • ADUs
  • Kitchen remodelingOptions for large and small kitchens
  • Bathroom remodelingFamily, master and powder rooms; new bathroom spaces
  • Room additionsBedrooms, offices and living spaces
  • General constructionLiving-space overhauls or smaller home updates

Reviews

What customers say

Customers praise clear communication and tidy work areas. One customer particularly valued end-of-day updates on the work completed that day.

Customer Reviews

Danny Do

We recently hired OSH Construction for our kitchen extension, and we couldn’t be happier with the entire experience. From the very first day, Sergio and his team impressed us with their professionalism, communication, and high-quality workmanship. The project started with major excavation and foundation work, and the crew handled it efficiently and with great care for our property. Once they moved into framing, electrical, and structural work, everything was organized and clearly explained. The team always showed up on time, kept the area as tidy as possible, and made sure we were aware of every step. Now that the kitchen is complete, the results are truly stunning. >PS: With a toddler at home and my wife being pregnant, we didn’t have time to tidy up the place as nicely as the kitchen should’ve been. ?? The craftsmanship is excellent, from the cabinetry and flooring to the lighting and finishes, everything feels beautifully done and thoughtfully installed. The new space has transformed our home, and we absolutely love it. Throughout the entire project, OSH Construction was responsive, reliable, and genuinely great to work with. They listened to our ideas, offered helpful suggestions, and delivered exactly what we envisioned, and more. We highly recommend OSH Construction, for any projects from home addition, ADU, and remodeling. A trustworthy company with exceptional workmanship!
View full reviewShow less

Derrick Lin

The absolute highest recommendations for Sergio (the owner) and his exceptional team at OSH Construction. Their honesty, professionalism, work ethic, attention to detail, and commitment to quality set them apart. They consistently go above and beyond, making what could have been a stressful remodel a smooth and positive experience. From the very beginning, Sergio stood out with his meticulous attention to detail, honesty, and transparency. During our initial walkthrough, he not only surveyed the project thoroughly but also identified potential issues and explained them clearly, patiently answering my many questions. Unlike other contractors who focused on upselling, Sergio genuinely listened to what we wanted and offered thoughtful, practical recommendations. His estimate and scope of work were clear, detailed, and fair, and he worked closely with us to ensure we felt completely comfortable with the plan. Once we confirmed, he provided a detailed schedule outlining the work process and payment milestones. The care and clarity Sergio brought to this phase gave us immense confidence moving forward. OSH Construction's work ethic and commitment to quality are truly next level. Every day, Sergio provided updates on what had been accomplished, what was planned for the next day, and addressed any concerns we had with quick and clear communication. His crew arrived punctually (usually around 7:30-8:30) and treated our home with incredible respect. Because it was a partial remodel and we were still living in the house, they carefully protected our spaces, laying down canvas and plastic to keep the area clean and dust-free. At the end of each day, they cleaned up so thoroughly that it hardly felt like construction was happening at all. Despite his busy schedule, Sergio made it a priority to visit our project multiple times a week, walking through progress with me personally and ensuring everything stayed on track. Partway through the project, we realized that Sergio had underbid on one of the line items--something we were able to confirm by comparing with other estimates we'd received. His response speaks volumes about his character and integrity. Although I offered to pay the difference because I was so impressed with the quality of their work, Sergio insisted, "not a penny." Sergio's honesty carried through to the end of the project. While we didn't follow the schedule perfectly, he honored the original payment timeline without hesitation. Sergio's team is exceptionally skilled and hardworking. When unforeseen issues arose--such as mold and termite damage--they were immediately communicated to us. Sergio assessed the situation in person and provided thoughtful recommendations. He walked us through our options and gave us space to make decisions without ever rushing or pressuring us. A huge shoutout to Imanol, Estachio, and the rest of the crew for their kindness, patience, and expertise. Living in the house during the remodel was challenging, but they went out of their way to be accommodating, helpful, and considerate every step of the way. Special recognition goes to Susano, the tile master, whose 20+ years of expertise shine in the incredible tiling work. Our tiles are flawless and a true testament to his craftsmanship. Sergio and his team consistently exceeded expectations. Whether it was fixing hidden issues that were discovered along the way, going outside the original scope of the project to make sure everything looked perfect, or maintaining exceptional cleanliness throughout, they went the extra mile to take care of us and our home. If you're looking for a contractor who is honest, thoughtful, highly skilled, and committed to delivering the absolute best, look no further than Sergio and OSH Construction. The experience was seamless, the quality of work unmatched, and the level of care they put into their work and customer relationships is rare to find. Thank you, Sergio, and the entire OSH Construction team. You've truly earned our highest praise and gratitude!
View full reviewShow less

Christine Marcin

Absolutely amazing service from Sergio and his team. Construction can be stressful but he and his team are always on time and always through and clean. I had a complete kitchen remodel as well as bathroom remodel done and I’m so happy with the outcome. I will definitely be using them again for future projects.
View full reviewShow less

Write a Review

Share your experience with this business. Reviews are moderated before they appear publicly.

We'll email you a link to confirm your review. It's only sent in once you click it.

Frequently Asked Questions

How does Osh Construction involve clients in projects?

Clients are involved from initial blueprint development through inspection of the finishing touches.