Decking & Pergola Prices in Seattle

Decking in Seattle starts from $3/sqft. A standard timber deck averages $35/sqft. Prices exclude sales tax. Building permits typically required. HOA restrictions may apply. Installation included in listed prices.

Timber hardwood and composite decking are the most popular choices in Seattle. Composite is gaining popularity for its low maintenance, while hardwood remains the premium choice for natural appearance and longevity. Treated pine is the most affordable option for budget-conscious projects.

Pergola costs in Seattle start from $30/sqft for an open timber structure and range up to $85/sqft for a fully insulated patio roof. Prices exclude sales tax. Building permits typically required. HOA restrictions may apply. Installation included in listed prices.

Composite decking costs $20–$40/sqft but requires almost no maintenance. Given local climate conditions, composite is often the better long-term value once oiling and staining costs for timber are factored in over 10+ years.