An ADU is one of the smartest things you can build on Oahu right now — a place for family to stay close, or rental income that turns your extra space into a monthly check. But an ADU is a full house in miniature: foundation, framing, plumbing, electrical, and a string of DPP inspections. Done right, it’s an asset for decades. Done wrong, it’s a money pit. That’s where we come in.
Choose your ADU
Start from one of our proven layouts and we’ll tailor it to your lot — or bring us your own vision. Every one is built to Hawaii code, permit-ready, and finished to the same premium standard.
Images are design concepts. Your ADU is custom to your lot, your budget, and Oahu code — we’ll give you a real price in your consultation.
Two signature looks
Whatever your taste — timeless island or clean warm modern — we design and build it to feel like it was always meant to be there.
Design concepts — your ADU is tailored to your lot and taste.
Choose your look
Every model comes in three curated exterior palettes — or we’ll match your main house. Pick the feel; we build it to last in Oahu sun and salt air.
Plantation White
Bright white stucco, warm cedar accents, bronze standing-seam roof. Timeless island classic.
Coastal Grey
Soft grey board-and-batten, crisp white trim, black windows, light-oak warmth. Breezy and coastal.
Lava Charcoal
Dramatic charcoal siding, rich teak, matte-black metal, concrete. Bold and modern.
Palettes are illustrative — finishes, flooring, cabinets, and fixtures are all chosen with you.
Small footprint. Full home.
A few hundred square feet, designed right, lives like a whole house — vaulted ceilings, real kitchens, island light, and finishes you’d be proud to show off. This is the standard we build to.
Interior design concepts. Pick your finishes with us — flooring, cabinets, counters, and fixtures are yours to choose.
Two ways we help
Start to finish
You’ve got the idea — we handle everything. Design, plans, DPP permit, and the full build, managed by one licensed team with one clear price. You watch it go up; we handle the headaches.
Pulled your own permit? We’ll finish it.
A lot of homeowners pull an owner-builder ADU permit, start strong, then hit the hard part — the foundation, the rough-ins, the inspections that keep failing. We’ll step in and take it over, whole or in part, and get you to the finish line the right way.
Built here, not shipped here
You’ve seen the mainland prefab companies — order a box online, wait for a crate, hope it fits. That model doesn’t work on Oahu, and it isn’t how you get the ADU you actually want. Here’s the difference:
Custom to your lot
Your slope, your setbacks, your view, your access — we design around the yard you actually have, not a one-size catalog unit.
We handle DPP
Permits, inspections, and the Hawaii build sequence are ours to manage. A shipped box still has to pass local inspection — and that’s where mainland kits stall.
Local crews, local accountability
Licensed GC (BC-39795) with crews on this island. A live project board and daily photo logs mean you always know where it stands.
Island-proven build
Built for Oahu sun, salt air, and code — the right materials and details so it lasts decades, not a few trade-wind seasons.
Your backyard could pay you back
On Oahu’s housing market, a legal ADU is one of the few improvements that can turn around and pay for itself. Rent out a permitted unit and the monthly income can offset — or cover — the financing on the build. When you’re done, you own an appraisable second dwelling, not a depreciating purchase.
- Rental income — a legal ADU can command steady monthly rent in Oahu’s tightest-in-the-nation housing market.
- Multigenerational living — keep parents or adult kids close, with their own space and privacy, instead of paying someone else’s mortgage.
- Property value — a permitted, professionally built second dwelling adds real, appraisable value to your lot.
- Financing that fits — let the rent do the work; see monthly-payment options built right into your estimate. See financing →
Rental income varies by size, location, and finishes — we’ll run honest numbers for your lot in your consultation.
Why the inspections trip people up
Owner-builder ADUs stall at the same places: a footing that doesn’t pass, a rough-in that has to be opened back up, a shower pan that fails its flood test, or a final that keeps getting kicked. We build the correct Hawaii sequence — 30-day concrete cure, DPP inspections scheduled with the right buffer, wet-area waterproofing done to code — so you pass the first time instead of paying twice.
Thinking about an ADU, or stuck on one you already started? Call or text (808) 330-1164 and we’ll walk your property with you — no pressure, just a clear plan and an honest price.
What homeowners ask us
Can I even build an ADU on my lot?
Often yes — Oahu’s rules allow ADUs on many residential lots, but it comes down to lot size, zoning, parking, and setbacks. Tell us your address and we’ll check what your property qualifies for.
What does an ADU cost?
It depends on size, finishes, and site conditions (utilities, grading, access). We give you a real, honest number for your project in your consultation — and financing can turn it into monthly payments. See financing →
How long does it take?
Design and permitting through DPP is usually the longest stretch; the build itself is faster. We manage the whole timeline and keep you updated the entire way — no guessing.
Can I rent it out?
A permitted ADU can be a legal long-term rental — steady monthly income on Oahu’s tight housing market. We’ll build it to code so it’s a real, rentable asset.
I already pulled my own permit — can you take over?
Yes. We step into owner-builder projects all the time — the whole build or just the hard parts (foundation, rough-ins, the inspections that keep failing). We’ll get you to the finish line the right way.
What our clients say
“I hired IBBuilders to renovate my condo/townhouse and they made the experience so much easier. The work crews were fantastic… I can’t recommend them enough — not just because of the quality of the job but because of the quality of people that they are.”
“Shane is responsive, he does what he says he’s going to do, and he cares about the people he’s working for more than most… If you’re considering a high-quality remodel on Oahu, I’d recommend Shane.”
Serving Oahu, island-wide
We build ADUs across the island — Kailua, Kāneʻohe, Pearl City, ʻAiea, Mānoa, Makiki, Kāhala, Wahiawā, and everywhere between. Big lot or tight footprint, we’ll tell you honestly what fits.