O‘ahu residential general contractor
Custom homes, renovations and additions, built with the whole house in mind.
Building Science is a personal, boutique general contractor for O‘ahu homeowners planning a significant project. We coordinate the structure, systems, materials and finishes as one connected whole, and keep you informed from the first conversation to the final walkthrough.
Where the Whole House Matters
A home is a system, not a collection of parts.
Structure, plumbing, electrical, ventilation, layout, materials and finishes all affect one another. A new opening changes how a wall carries load and how a room catches the breeze. A kitchen layout depends on where water, power and venting can practically go. When those decisions are made in isolation, problems tend to surface later.
We plan and build with those connections in view, so the finished home works as well as it looks, and continues to serve the people who live in it.
01
Structure
Foundations, framing and load paths that everything else depends on.
02
Plumbing & electrical
Supply, drainage, power and lighting planned around how each room is used.
03
Air & moisture
Ventilation and moisture management that suit Hawai‘i’s climate.
04
Layout & flow
How rooms connect to each other, to the outdoors and to daily routines.
05
Materials & finishes
Selections that fit the setting, the design and long-term care.
06
Comfort & function
Light, airflow, storage and the small details you notice every day.
What we build
Our services
01
A home planned around your property, your household and the way you want to live, with every trade coordinated from foundation to finish.
02
Major and whole-home renovations that improve how an existing house looks, functions and feels, including the parts you can’t see.
03
More room for family, guests or work, connected structurally, functionally and visually to the home you already have.
04
Kitchens laid out for how you cook and gather, with plumbing, electrical, ventilation and finishes planned together.
05
Bathrooms built for comfort and durability, with careful attention to waterproofing, ventilation and detail.
Selected work
Craftsmanship you can see. Coordination you can’t.
Completed spaces and work in progress from Building Science projects, from framing to final finish.
Meet Sean McKenzie
A builder who works directly with you.
Building Science grew out of owner Sean McKenzie’s lifetime in building and construction. Sean grew up in the industry and spent years working with different companies and across many parts of the business, including frontline management.
That experience shaped a simple conviction: a successful project takes more than managing individual trades. It takes understanding how the entire home works together. Building Science is also Sean’s return to the part of the work he enjoys most: working directly with homeowners and helping them turn a house into a home.
How we work
A clear path from first conversation to final walkthrough.
01
Conversation
Tell us about your home, your goals and what’s prompting the project. We listen first and ask the questions that shape the right approach.
02
Planning
We look at the whole house: existing conditions, systems, priorities and constraints, so decisions are made with the full picture in view.
03
Building
We coordinate the trades, materials, schedule and site, and keep you informed as the work progresses, including when something unexpected comes up.
04
Completion
We review the finished work together, room by room and system by system, before we call it done.
Client words
What homeowners say
“Without reservation, I would recommend Building Science to anyone looking for reliable, high-quality construction services.”
Michael Fischer
Client testimonial
“We had the best experience working with Sean and the whole Building Science team!”
Lindsay McHale
Client testimonial
“We want to sincerely thank you for building our home addition.”
Peter & Jacky Jaeger
Client testimonial
Planning a new home, renovation or addition?
Tell us about your project and let’s start the conversation.