Thurston County

Home permits and project costs in Olympia, WA

Olympia sits in Thurston County, Washington. Persistent rainfall and moisture management dominate exterior detailing, while seismic provisions apply to structural and foundation work. Work outside city limits is permitted by the county building department rather than the city.

Verified August 2026

Local cost index

+13%

vs national average

Permit fee index

+10%

vs national baseline

Population

55,605

Homeownership

Do you need a permit in Olympia?

For most structural work, yes

Olympia enforces washington state residential code, based on the irc, plus the state energy code through Thurston 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 Olympia

National baselines adjusted by the local labor and materials index.

Project	Typical cost	Permit	Deep pages
Roof Replacement	$11,500 – $38,700	required	Cost·Permit
AC Replacement	$6,100 – $18,100	required	Cost·Permit
Fence Installation	$2,800 – $12,800	usually required	Cost·Permit
Water Heater Replacement	$1,400 – $6,400	required	Cost·Permit
Pool Installation	$45,300 – $137,000	required	Cost·Permit
Window Replacement	$8,900 – $40,400	required	Cost·Permit
Electrical Panel Replacement	$2,300 – $8,100	required	Cost·Permit
Generator Installation	$7,700 – $26,100	required	Cost·Permit
Solar Panel Installation	$17,400 – $55,700	required	Cost·Permit
Kitchen Remodel	$20,500 – $104,900	conditional	Cost·Permit
Bathroom Remodel	$10,300 – $48,100	conditional	Cost·Permit
Driveway Replacement	$4,900 – $22,200	usually required	Cost·Permit
Paver Patio & Walkway	$4,000 – $18,400	conditional	Cost·Permit
Deck Construction	$6,500 – $33,000	required	Cost·Permit
Shed Installation	$2,100 – $13,800	conditional	Cost·Permit
Whole-House Repipe	$5,400 – $19,000	required	Cost·Permit
EV Charger Installation	$900 – $5,000	required	Cost·Permit
Hurricane Shutter Installation	$3,900 – $21,700	required	Cost·Permit
Pool Enclosure / Screen Cage	$10,800 – $50,400	required	Cost·Permit
Septic System Replacement	$9,000 – $33,500	required	Cost·Permit
Impact Window Installation	$10,800 – $50,300	required	Cost·Permit
Exterior Door Replacement	$1,100 – $7,700	usually required	Cost·Permit
Garage Door Replacement	$1,700 – $9,000	required	Cost·Permit
Siding Installation	$9,400 – $44,900	usually required	Cost·Permit
Stucco Repair	$1,000 – $18,400	conditional	Cost·Permit
Soffit & Fascia Replacement	$2,100 – $13,000	conditional	Cost·Permit
Gutter Installation	$1,000 – $7,400	rarely required	Cost·Permit
Roof Repair	$500 – $5,700	conditional	Cost·Permit
Flat Roof Replacement	$7,200 – $33,700	required	Cost·Permit
Attic Insulation	$1,300 – $8,400	rarely required	Cost·Permit
Ductwork Replacement	$2,900 – $14,000	required	Cost·Permit
Mini Split Installation	$2,800 – $14,600	required	Cost·Permit
Flooring Installation	$2,800 – $22,700	rarely required	Cost·Permit
Tile Installation	$2,100 – $18,300	rarely required	Cost·Permit
Interior Painting	$1,700 – $11,000	rarely required	Cost·Permit
Exterior Painting	$3,200 – $17,300	rarely required	Cost·Permit
Drywall Repair	$400 – $5,200	rarely required	Cost·Permit
Kitchen Cabinet Refacing	$5,100 – $22,800	rarely required	Cost·Permit
Countertop Replacement	$2,500 – $13,400	rarely required	Cost·Permit
Tub to Shower Conversion	$4,100 – $18,700	usually required	Cost·Permit
Sod Installation	$1,000 – $7,900	rarely required	Cost·Permit
Irrigation System Installation	$2,500 – $11,500	conditional	Cost·Permit
Tree Removal	$500 – $6,500	conditional	Cost·Permit
Outdoor Kitchen	$7,000 – $52,500	usually required	Cost·Permit
Seawall Repair	$9,700 – $114,900	required	Cost·Permit
Dock Construction	$10,900 – $102,800	required	Cost·Permit
Well Installation	$6,600 – $29,900	required	Cost·Permit
Mold Remediation	$1,800 – $17,600	conditional	Cost·Permit
Water Softener Installation	$1,400 – $7,600	usually required	Cost·Permit
Home Addition	$54,200 – $337,400	required	Cost·Permit

Olympia permitting basics

Jurisdiction	Olympia, Thurston County
Building department	Confirm with the city or county
Permit portal	No verified online portal on file
Owner-builder permits	Homeowner permits allowed on owner-occupied property
Contractor verification	Verify any license with Washington State Building Code Council before signing

Sources

Sources & verification

Washington State Building Code Council

Last verified August 2026. Cost figures are modeled estimates based on national baselines adjusted for local labor and material pricing — they are not quotes. Permit rules change; confirm with the building department before starting work.