Honolulu County

Home permits and project costs in Honolulu, HI

Honolulu 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

+64%

vs national average

Permit fee index

+23%

vs national baseline

Population

343,421

Homeownership

Do you need a permit in Honolulu?

For most structural work, yes

Honolulu 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 Honolulu

National baselines adjusted by the local labor and materials index.

Project	Typical cost	Permit	Deep pages
Roof Replacement	$16,900 – $56,900	required	Cost·Permit
AC Replacement	$8,700 – $25,900	required	Cost·Permit
Fence Installation	$4,100 – $18,700	usually required	Cost·Permit
Water Heater Replacement	$2,100 – $9,500	required	Cost·Permit
Pool Installation	$67,000 – $202,900	required	Cost·Permit
Window Replacement	$12,800 – $57,800	required	Cost·Permit
Electrical Panel Replacement	$3,400 – $12,000	required	Cost·Permit
Generator Installation	$11,400 – $38,600	required	Cost·Permit
Solar Panel Installation	$24,100 – $77,200	required	Cost·Permit
Kitchen Remodel	$29,100 – $148,500	conditional	Cost·Permit
Bathroom Remodel	$14,700 – $68,800	conditional	Cost·Permit
Driveway Replacement	$7,200 – $32,500	usually required	Cost·Permit
Paver Patio & Walkway	$5,900 – $26,800	conditional	Cost·Permit
Deck Construction	$9,600 – $48,600	required	Cost·Permit
Shed Installation	$3,000 – $20,100	conditional	Cost·Permit
Whole-House Repipe	$8,100 – $28,700	required	Cost·Permit
EV Charger Installation	$1,400 – $7,300	required	Cost·Permit
Hurricane Shutter Installation	$5,700 – $32,100	required	Cost·Permit
Pool Enclosure / Screen Cage	$16,000 – $74,800	required	Cost·Permit
Septic System Replacement	$13,300 – $49,500	required	Cost·Permit
Impact Window Installation	$15,400 – $72,100	required	Cost·Permit
Exterior Door Replacement	$1,600 – $11,400	usually required	Cost·Permit
Garage Door Replacement	$2,500 – $13,300	required	Cost·Permit
Siding Installation	$13,900 – $65,800	usually required	Cost·Permit
Stucco Repair	$1,500 – $26,600	conditional	Cost·Permit
Soffit & Fascia Replacement	$3,100 – $19,100	conditional	Cost·Permit
Gutter Installation	$1,500 – $10,600	rarely required	Cost·Permit
Roof Repair	$700 – $8,600	conditional	Cost·Permit
Flat Roof Replacement	$10,700 – $50,000	required	Cost·Permit
Attic Insulation	$1,900 – $11,600	rarely required	Cost·Permit
Ductwork Replacement	$4,200 – $20,100	required	Cost·Permit
Mini Split Installation	$4,000 – $20,900	required	Cost·Permit
Flooring Installation	$4,000 – $32,200	rarely required	Cost·Permit
Tile Installation	$3,000 – $26,700	rarely required	Cost·Permit
Interior Painting	$2,600 – $16,500	rarely required	Cost·Permit
Exterior Painting	$4,800 – $25,800	rarely required	Cost·Permit
Drywall Repair	$600 – $7,800	rarely required	Cost·Permit
Kitchen Cabinet Refacing	$7,500 – $33,100	rarely required	Cost·Permit
Countertop Replacement	$3,400 – $18,500	rarely required	Cost·Permit
Tub to Shower Conversion	$6,100 – $27,700	usually required	Cost·Permit
Sod Installation	$1,400 – $11,100	rarely required	Cost·Permit
Irrigation System Installation	$3,700 – $16,800	conditional	Cost·Permit
Tree Removal	$800 – $9,900	conditional	Cost·Permit
Outdoor Kitchen	$10,300 – $77,000	usually required	Cost·Permit
Seawall Repair	$14,500 – $172,000	required	Cost·Permit
Dock Construction	$16,300 – $153,900	required	Cost·Permit
Well Installation	$9,800 – $44,600	required	Cost·Permit
Mold Remediation	$2,700 – $26,600	conditional	Cost·Permit
Water Softener Installation	$2,100 – $11,200	usually required	Cost·Permit
Home Addition	$80,300 – $499,800	required	Cost·Permit
Heat Pump Replacement	$10,900 – $36,800	required	Cost·Permit
Furnace Replacement	$5,400 – $19,300	required	Cost·Permit
Foundation Repair	$4,700 – $54,300	usually required	Cost·Permit
Basement Waterproofing	$5,000 – $29,900	conditional	Cost·Permit
Drain Field Replacement	$10,500 – $43,900	required	Cost·Permit
Toilet Installation	$400 – $1,800	rarely required	Cost·Permit
Hot Tub Installation	$9,400 – $37,600	usually required	Cost·Permit

Honolulu permitting basics

Jurisdiction	Honolulu, 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.