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ADU Plans Gallery

Browse pre-approved architectural plans tailored for Hawai'i's climate and regulations.

Note: Estimated costs vary by island, site conditions, and finish level. Oahu typically has higher construction costs. Contact a contractor for accurate quotes.

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Showing 6 of 6 plans
Modern Studio ADU
Modern

Modern Studio ADU

Compact modern studio perfect for single occupants or couples. Energy-efficient design with open floor plan.

400
sq ft
0
bed
1
bath
Estimated Cost
150K
Tropical One-Bedroom
Contemporary

Tropical One-Bedroom

Spacious one-bedroom with covered lanai. Perfect for rental income. Climate-responsive design.

650
sq ft
1
bed
1
bath
Estimated Cost
225K
Family Two-Bedroom
Traditional

Family Two-Bedroom

Two-bedroom ADU ideal for families or multigenerational living. Includes separate living areas.

900
sq ft
2
bed
1.5
bath
Estimated Cost
320K
Luxury Two-Bedroom
Modern

Luxury Two-Bedroom

Premium two-bedroom with high-end finishes. Double bathrooms and premium appliances.

1100
sq ft
2
bed
2
bath
Estimated Cost
425K
Compact One-Bed
Contemporary

Compact One-Bed

Efficient one-bedroom design maximizing space. Great starter ADU for new builders.

550
sq ft
1
bed
1
bath
Estimated Cost
195K
Ohana Three-Bedroom
Traditional

Ohana Three-Bedroom

Spacious three-bedroom perfect for multi-family living. Includes guest quarters potential.

1200
sq ft
3
bed
2
bath
Estimated Cost
480K

Plan Your Finances

Use our mortgage calculator to estimate monthly payments and understand the total cost of your ADU investment.

Mortgage Calculator

Estimate your monthly ADU payments

Current Mortgage Rates

As of February 6, 2026

Sources: Bankrate, Freddie Mac, Money.com. Rates are national averages and may vary. Click a rate to apply it.

Down payment: $50,000

Estimated Monthly Payment

$1,624.40

Loan amount: $200,000

Monthly Breakdown

Principal & Interest
$1,232.74
Property Tax
$291.67
Insurance
$100.00

Total Interest

$243,785

Total Cost

$584,785

First Year Summary

Principal paid$2,339
Interest paid$12,454
Remaining balance$197,661

This calculator provides estimates only. Rates shown are national averages as of February 6, 2026 and may vary by lender, credit score, and location. Contact a lender for personalized quotes. Hawai'i property taxes vary by county.