United Construction Group Hawaii
Custom Home Additions
Providing custom home building services to Hawaii including Oahu, Maui, Big Island, and Kauai.
At UCG Hawaii, we provide expert home addition services to create the extra space you need while maintaining the beauty and functionality of your home.
Whether you’re growing your family, looking to add luxury amenities, or simply want to upgrade your living space, our custom home additions are designed to blend seamlessly with your existing structure.
Our Custom Home Addition Services
Bedroom Additions
Expand your home’s comfort and functionality by adding bedrooms designed with attention to detail and your family’s unique needs. From luxurious master suites to cozy guest rooms, we create spaces that reflect your style and enhance your living experience.
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Master Suites
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Guest Bedrooms
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Children’s Bedrooms
- Walk-In Closets
- Home Office Conversions
Multi-Generational Spaces
Foster family togetherness while maintaining privacy with well-designed multi-generational spaces. These additions are perfect for accommodating extended family, offering both independence and a shared home environment.
In-Law Suites
Guest Houses
Accessible Additions
Shared Living Areas
Private Entrances
Outdoor Living Spaces
Enjoy Hawaii’s natural beauty by creating outdoor spaces that blend seamlessly with your lifestyle. From elegant lanais to fully-equipped outdoor kitchens, we help you make the most of your property.
Lanais and Patios
Deck Extensions
Outdoor Kitchens
- Pergolas and Gazebos
- Fire Pits
- Swimming Pool Areas
Garage Additions & Conversions
Maximize your property’s potential with garages that serve more than just storage. Whether you’re adding a new structure or converting an existing one, we design spaces to fit your needs, from workshops to modern living areas.
New Garages
Garage Apartments
Storage Solutions
- Home Gym Conversions
- Workshop Areas
- EV Charging Stations
Kitchen Expansions
Transform your kitchen into the heart of your home with expanded layouts, modern appliances, and custom designs. Whether you need more space to entertain or dream of a chef-inspired setup, we bring your vision to life.
Open-Concept Kitchens
Chef’s Kitchen
Island Additions
- Pantry Expansions
- Custom Backsplashes
- Lighting Upgrades
Living Room Enhancements
Elevate your living room into a stylish and functional hub for family gatherings, relaxation, or entertainment. From custom built-ins to upgraded lighting, we ensure your living space is as inviting as it is practical.
Entertainment Rooms
Open Layouts
Fireplace Additions
- Custom Built-Ins
- Ceiling Treatments
Our Remodeling Process
Step 1
At United Construction Group, our design experts begin with a detailed in-home consultation to understand your vision and create custom 3D renderings.
Step 2
United Construction Group’s dedicated team ensures minimal disruption to your home life, with daily cleanup and consistent updates throughout the construction process.
Step 3
United Construction Group’s Hawaii bathroom remodeling team meticulously inspects every detail, ensuring all elements meet our premium quality standards.
Your Custom Home Awaits
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- Personalized Consultation & Design
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- Immersive Design Experience
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- Transparent Planning
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- Minimal Disruption Installation
- Quality Assurance
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Picture Gallery
Benefits of Custom Home Additions with UCG Hawaii
Designed Specifically for Your Lifestyle
Every family is different, and their needs in a home remodeling project are tailored to their specific desires and requirements. Whether you’re creating a nursery, a spacious master suite, or a multi-generational space, we tailor each addition to match your lifestyle, preferences, and future goals.
Seamless Architectural Integration
We don’t just build—we blend. Our design team ensures your new addition looks like it was always part of your home by matching structural lines, materials, finishes, and color palettes to create a cohesive look.
Boosts Property Value
Quality additions can significantly increase your home’s resale value in an entire project, making your property more attractive to future buyers. These improvements, from extra bedrooms to outdoor living spaces, make your property more attractive to future buyers while enhancing your enjoyment today.
Island-Specific Expertise
Building in Hawaii requires a deep understanding of island climates, terrain, and zoning laws. With years of local experience, we navigate these complexities for you, ensuring your project stays on track and compliant.
Full-Service Design & Build
From initial design concepts to final walkthroughs, our in-house services team handles every aspect of your home addition. You get one point of contact, transparent updates, and a streamlined process from start to finish.
Energy Efficiency and Sustainability
We incorporate eco-conscious materials, energy-saving appliances, smart construction services, and layout choices that help lower utility costs and reduce your environmental footprint—all while maintaining comfort, style, and finishing touches.
Built with Ohana in Mind
Our additions are crafted to support the values of connection, comfort, and care. Whether it’s a guest house for your parents or an outdoor kitchen for gatherings, we help you build a home where everyone feels welcome.
Frequently Asked Questions
How long does a custom home addition take from start to finish?
How long does a custom home addition take from start to finish?
The timeline depends on the size and complexity of the project. A basic room addition might take 2–3 months, while larger or multi-structure projects can take 4–6 months or more. After your consultation, we provide a clear schedule with milestones and regular updates throughout the build.
Will the new addition match the look and style of my current home?
Yes. We specialize in cohesive design. We carefully select materials, finishes, and architectural details that complement your existing structure, making your addition look like a natural extension of your home.
Do I need to obtain permits for a home addition in Hawaii?
Yes, permits are required for most structural modifications, including plumbing, electrical, and additions, and our general contractor will manage the entire permitting process for you. We manage the entire permitting process for you, ensuring compliance with state and county building codes across Oahu, Maui, the Big Island, and Kauai.
Can UCG Hawaii build on challenging terrain or smaller lots?
Absolutely. We have extensive experience designing additions on steep slopes, coastal properties, and tight urban lots. We’ll conduct a site assessment to determine the best approach for your specific location.
Do you offer design services, or do I need to bring my own plans?
We offer complete in-house design services but are happy to work with homeowners’ existing plans or collaborate with your architect. Either way, we ensure your vision is fully realized with professional execution.
Can I live in my home during the construction process?
In many cases, yes. We work to minimize disruption to your daily life. However, depending on the project’s scope, especially if utilities are impacted, you may need to relocate temporarily. We’ll advise you ahead of time and plan accordingly.
How do I get started with a custom addition?
The first step in the entire process is a free consultation with our team. We’ll listen to your goals, evaluate your space, and provide recommendations and a preliminary quote. From there, we’ll move into design development and formal budgeting before construction begins.
Plan. Design. Build your dreams.
We redefine construction with commitment and
expertise, shaping enduring, inspiring spaces. We strive to create enduring spaces that inspire and stand as a testament to our dedication to