Portland Deck Guides: Costs, Permits and Decking Materials
Short, sourced guides for planning a deck in the Portland area, quoting the code, the cities and the manufacturers rather than paraphrasing them.
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Best Decking Material for Portland's Wet Climate, Compared
Pressure-treated fir, cedar or composite? How each decking material copes with Portland rain, moss and shade, what warranties cover and which suits your yard.
Deck Permits in Portland, OR: The 30-Inch Rule and More
Do you need a permit for a deck in Portland? Oregon's 30-inch rule, covered-deck limits, setbacks, tree protection and railing heights, quoted from the code.
Deck Railing Height Code in Oregon: Guards, Stairs and Gaps
How high a deck railing must be in Oregon, when a deck needs one, the 4-inch gap rule and stair and handrail rules, quoted from the Oregon residential code.
Where to start
- Does my deck need a permit? Our guide to deck permit rules quotes Oregon’s 30-inch rule and sets out what Portland, Lake Oswego, Tigard, Happy Valley, Oregon City and the counties add.
- How high does the railing have to be? The guide to deck railing height and stair code quotes the guard, gap, stair and handrail rules from the Oregon code.
- Which boards should I use? Our comparison of the best decking for Portland’s climate covers treated wood, cedar, hardwood, composite and PVC in our rain and shade.
- What will it cost? Our page on what a deck costs gives the most recent published Portland figures for a wood and a composite deck, and what moves a quote up or down.
Each guide names its sources and the date it was checked. Codes and city rules change: Oregon’s 2026 residential code becomes mandatory on April 1, 2027, so confirm the rules for your address with the permit office before you build.
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