Honolulu County

Home permits and project costs in Kailua, HI

Kailua sits in Honolulu County, Hawaii. Coastal wind design and salt-air corrosion raise material specifications for roofing, fasteners, siding and mechanical equipment. Work outside city limits is permitted by the county building department rather than the city.

Model reviewed August 2026

Local cost index

+59%

vs national average

Permit fee index

+15%

vs national baseline

Population

40,514

Homeownership

Do you need a permit in Kailua?

For most structural work, yes

Kailua enforces hawaii state building code, based on the irc with county amendments through Honolulu County. Roofing, electrical, plumbing, structural, pools and most exterior additions require a permit and inspection. Cosmetic work — paint, flooring, cabinet swaps — generally does not.

Project costs in Kailua

National baselines adjusted by the local labor and materials index.

Project	Typical cost	Permit	Deep pages
Roof Replacement	$16,100 – $54,100	required	Cost·Permit
AC Replacement	$8,400 – $24,900	required	Cost·Permit
Fence Installation	$3,900 – $17,900	usually required	Cost·Permit
Water Heater Replacement	$2,000 – $9,100	required	Cost·Permit
Pool Installation	$64,000 – $193,800	required	Cost·Permit
Window Replacement	$12,200 – $55,200	required	Cost·Permit
Electrical Panel Replacement	$3,200 – $11,500	required	Cost·Permit
Generator Installation	$10,900 – $37,000	required	Cost·Permit
Solar Panel Installation	$23,200 – $74,300	required	Cost·Permit
Kitchen Remodel	$28,100 – $143,600	conditional	Cost·Permit
Bathroom Remodel	$14,200 – $66,500	conditional	Cost·Permit
Driveway Replacement	$6,900 – $31,200	usually required	Cost·Permit
Paver Patio & Walkway	$5,700 – $25,900	conditional	Cost·Permit
Deck Construction	$9,200 – $46,600	required	Cost·Permit
Shed Installation	$2,900 – $19,400	conditional	Cost·Permit
Whole-House Repipe	$7,700 – $27,500	required	Cost·Permit
EV Charger Installation	$1,300 – $7,000	required	Cost·Permit
Hurricane Shutter Installation	$5,400 – $30,600	required	Cost·Permit
Pool Enclosure / Screen Cage	$15,300 – $71,400	required	Cost·Permit
Septic System Replacement	$12,600 – $47,200	required	Cost·Permit
Impact Window Installation	$14,700 – $68,700	required	Cost·Permit
Exterior Door Replacement	$1,500 – $10,900	usually required	Cost·Permit
Garage Door Replacement	$2,400 – $12,600	required	Cost·Permit
Siding Installation	$13,300 – $63,000	usually required	Cost·Permit
Stucco Repair	$1,400 – $25,700	conditional	Cost·Permit
Soffit & Fascia Replacement	$3,000 – $18,200	conditional	Cost·Permit
Gutter Installation	$1,400 – $10,300	rarely required	Cost·Permit
Roof Repair	$700 – $8,200	conditional	Cost·Permit
Flat Roof Replacement	$10,200 – $47,600	required	Cost·Permit
Attic Insulation	$1,800 – $11,200	rarely required	Cost·Permit
Ductwork Replacement	$4,000 – $19,300	required	Cost·Permit
Mini Split Installation	$3,900 – $20,100	required	Cost·Permit
Flooring Installation	$3,900 – $31,300	rarely required	Cost·Permit
Tile Installation	$2,900 – $25,800	rarely required	Cost·Permit
Interior Painting	$2,500 – $16,000	rarely required	Cost·Permit
Exterior Painting	$4,700 – $25,000	rarely required	Cost·Permit
Drywall Repair	$600 – $7,500	rarely required	Cost·Permit
Kitchen Cabinet Refacing	$7,200 – $32,100	rarely required	Cost·Permit
Countertop Replacement	$3,300 – $18,000	rarely required	Cost·Permit
Tub to Shower Conversion	$5,800 – $26,600	usually required	Cost·Permit
Sod Installation	$1,400 – $10,800	rarely required	Cost·Permit
Irrigation System Installation	$3,600 – $16,200	conditional	Cost·Permit
Tree Removal	$800 – $9,500	conditional	Cost·Permit
Outdoor Kitchen	$9,900 – $74,000	usually required	Cost·Permit
Seawall Repair	$13,800 – $163,600	required	Cost·Permit
Dock Construction	$15,500 – $146,400	required	Cost·Permit
Well Installation	$9,400 – $42,600	required	Cost·Permit
Mold Remediation	$2,600 – $25,600	conditional	Cost·Permit
Water Softener Installation	$2,000 – $10,800	usually required	Cost·Permit
Home Addition	$76,500 – $475,700	required	Cost·Permit
Heat Pump Replacement	$10,500 – $35,400	required	Cost·Permit
Furnace Replacement	$5,100 – $18,500	required	Cost·Permit
Foundation Repair	$4,600 – $52,200	usually required	Cost·Permit
Basement Waterproofing	$4,800 – $28,900	conditional	Cost·Permit
Drain Field Replacement	$10,100 – $42,100	required	Cost·Permit
Toilet Installation	$400 – $1,800	rarely required	Cost·Permit
Hot Tub Installation	$9,000 – $36,200	usually required	Cost·Permit

Kailua permitting basics

Jurisdiction	Kailua, Honolulu County
Building department	Confirm with the city or county
Permit portal	No verified online portal on file
Owner-builder permits	Owner-builder permits allowed with an exemption affidavit
Contractor verification	Verify any license with Hawaii State Building Code Council before signing

Sources

Sources & verification

Hawaii State Building Code Council

Model vintage August 2026. The links above are the issuing agencies' own pages — we publish them so you can confirm the current rule yourself, not as evidence that each fact on this page was re-checked with them today. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing, not quotes. Permit rules change; confirm with the building department before starting work.