UCG Hawaii offers home additions across Oahu, Maui, Big Island & Kauai. Services include ADUs, granny flats & in-law suites. They handle permits, design & site challenges, with a free consultation to start.

UCG Hawaii – ADU Contractor in Honolulu, HI

About UCG Hawaii

Home Additions and Custom Projects with UCG Hawaii

UCG Hawaii offers home addition services across the Hawaiian islands, including Oahu, Maui, the Big Island, and Kauai. Their work covers a range of project types, from basic room additions to larger, more complex multi-structure builds. For homeowners exploring options like an accessory dwelling unit, a backyard cottage, an in-law suite, or a granny flat, UCG Hawaii brings relevant construction experience to the table.

The timeline for a home addition project varies depending on scope and complexity. A straightforward room addition may take around 2–3 months, while larger or more involved projects can run 4–6 months or longer. UCG Hawaii provides a clear project schedule with defined milestones after the initial consultation, along with regular updates throughout the build.

Design, Permitting, and Site Considerations

One area UCG Hawaii focuses on is cohesive design. They work to select materials, finishes, and architectural details that complement the existing structure, so that any addition integrates naturally with the home rather than appearing as a separate or mismatched element.

Permits are required for most structural modifications in Hawaii, including work involving plumbing, electrical systems, and additions. UCG Hawaii manages the permitting process on behalf of homeowners, ensuring compliance with state and county building codes across all the islands they serve.

Their team also has experience working on challenging sites, including steep slopes, coastal properties, and tight urban lots. A site assessment is conducted to determine the most suitable approach for each specific location before construction planning begins.

When it comes to design services, UCG Hawaii offers in-house design support but can also work with homeowners who already have existing plans or who are collaborating with their own architect. The goal is to ensure the homeowner's vision is carried through with professional execution, regardless of where the design originates.

What to Expect During Construction

In many cases, homeowners are able to remain in their homes during construction. However, depending on the scope of the project — particularly if utilities are affected — temporary relocation may be necessary. UCG Hawaii advises homeowners on this ahead of time and plans accordingly to minimize disruption where possible.

The process begins with a free consultation. During this initial meeting, the team listens to the homeowner's goals, evaluates the space, and provides recommendations along with a preliminary quote. From there, the project moves into design development and formal budgeting before any construction work begins.

For homeowners on the Hawaiian islands looking for an ADU contractor, an ADU builder, or a detached ADU builder, UCG Hawaii offers a structured process from initial consultation through to project completion.

Services

UCG Hawaii performs the following services

  • Architecture & Design
  • Permit Specialist
  • Construction
  • Feasibility & Site Assessment
  • Finishing & Fit-out

UCG Hawaii Reviews

Johnette Valley

2026-02-19
"Our experience with this general contractor was excellent from start to finish. They provided a clear plan, realistic timeline, and fair pricing. The team worked efficiently and maintained strong communication at every stage. Their attention to detail and quality craftsmanship really impressed us. The finished project exceeded our expectations, and we wouldnt hesitate to hire them again."

Yasmyn Andrade

2026-01-31
"United Construction Group Hawaii is handling the full demo and build-out of our new house, and even while the project is still in progress, its already lining up almost EXACTLY with the vision we had going into it. At first, we seriously considered managing the project ourselves, but after giving it more thought, we hired UCGH and working with Brandon has made the whole process feel way more grounded and manageable. Hes taken on coordinating everything and being the main point of contact between all the different contractors, which is huge on a build like this. Communication has stayed consistent, and we always feel like things are being handled thoughtfully instead of rushed or overlooked. Construction projects can be stressful, especially with so many moving parts, but Brandon has stayed steady and responsive the entire way through so far. You can tell he takes pride in his work and really knows how to choose the right people to move each phase forward properly. Seeing the progress take shape has been reassuring, and were feeling confident about where things are headed. Were really happy with how its coming together and would confidently recommend United Construction Group Hawaii to anyone taking on a major renovation or build."

panthur64

2026-01-01
"Absolutely exceptional work! United construction group went above and beyond to get Graze Craze Honolulu up and running. Their professionalism, attention to detail, and dedication truly amazed us. Every aspect of their work was top-notch from planning and coordination to execution. Thanks to their expertise, were now able to offer our beautiful grazing boards and events to the Honolulu community. Highly recommend United Construction group for anyone looking for reliable, quality craftsmanship. We are grateful for their hard work and look forward to working with them again in the future!"

Jan

2026-01-01
"United Construction Group was great to work with from start to finish. Communication was always clear, the timeline was respected, and the quality of the work exceeded our expectations. The crew was professional, well-organized, and paid attention to the small details that really matter. The whole process was smooth and stress-free. Highly recommended!"

Jeff Fisher

2026-01-01
"United Construction Group Hawaii delivers exactly what most contractors promisebut rarely execute. From the first conversation to project completion, UCG was professional, organized, and disciplined. Communication was clear, timelines were realistic, and the quality of work spoke for itself. No runarounds. No excuses. Just execution. They understand Hawaii construction at a high level, materials, climate, permitting, and logisticsand it shows in how they plan and build. The crew was respectful, detail-oriented, and took real ownership of the work instead of cutting corners. What stood out most was accountability. One point of contact. Transparent pricing. Problems addressed immediately, not delayed or deflected. If youre looking for a contractor you can actually trust with repairs, renovations, or full construction projects in Hawaii, United Construction Group is the real deal. I would absolutely work with them again and recommend them without hesitation."

Specifics

Licensed

Opening hours

Monday 7:00AM - 6:00PM
Tuesday 7:00AM - 6:00PM
Wednesday 7:00AM - 6:00PM
Thursday 7:00AM - 6:00PM
Friday 7:00AM - 6:00PM
Saturday 7:00AM - 6:00PM
Sunday 7:00AM - 6:00PM

Location

Did we help?

Please let UCG Hawaii know that you found them on Top ADU Pros to allow us to continue helping others find the best adu contractors.

get in contact