If you own a home in Eureka, Arcata, Fortuna or anywhere along Humboldt Bay, there is a good chance you have a deck that has been through a lot of wet winters. At some point every deck owner asks the same thing: can this be fixed, or does it need to come off and be rebuilt?
This guide covers what the north coast climate does to outdoor wood, the questions to ask before you decide, what today's railing code asks of a rebuilt deck, and who issues the permit where you live. It is not a substitute for someone looking at your deck in person. If you would like that, Humboldt Bay Construction Co. builds and rebuilds decks across Humboldt and Trinity County.
Why are decks on the Humboldt coast so hard on wood?
The USDA Forest Products Laboratory rates how hard a place's climate is on wood left outdoors, above the ground, with a decay hazard (Scheffer) index: the higher the number, the greater the hazard. Its table of values for 1971 to 2000 lists Eureka at 44.5. The map groups places into three bands: under 35, 35 to 65, and over 65.
So Eureka is in the middle band. That does not mean your deck will fail on a set schedule, because the index compares places. It does not predict when one structure will fail. But between the fog, the rain and the long wet season, wood on the coast stays damp for a lot of the year, and damp wood is where decay starts.
Source: USDA Forest Products Laboratory, Decay Hazard (Scheffer) Index Values, 1971-2000 (FPL-GTR-179). More detail is in our answer on wood decay on the north coast.
What should I look at before deciding?
You do not need tools to get a first read. Walk the deck and look underneath it with a flashlight:
- Where does water sit? Look where boards meet the house, around stair stringers, and at post bases. Those spots stay wet longest.
- Does anything feel soft? Boards or framing that give under your foot or a screwdriver tip are a warning sign.
- Is the railing solid? Push on it. A guard that moves is a safety problem, whatever condition the boards are in.
- What is under the surface? New deck boards on tired framing is a common shortcut. The framing, posts and the attachment to the house carry the load.
- How do the stairs feel? Uneven steps and loose treads are where people trip.
If the problems are limited to a few surface boards, a repair may make sense. If the framing, posts, ledger or railings are compromised, it usually becomes a rebuild conversation. The right call depends on what is found when someone opens it up.
If I rebuild, what does the railing code require now?
A rebuild is new work, so it has to meet the current code, and that is often different from what the old deck was built to. From the 2025 California Residential Code, Chapter 3:
- When a guard is required: on open-sided floors, stairs, ramps and landings more than 30 inches above the floor or grade below, at any point within 36 inches of the open edge (R321.1.1). Insect screening does not count as a guard.
- Height: required guards must be at least 42 inches high (R321.1.2). On the open sides of stairs, at least 34 inches, measured from a line along the nosings.
- Openings: a 4-inch sphere must not pass through a required guard. On the open side of stairs, the limit is a 4-3/8-inch sphere, and the triangle formed by the riser, tread and bottom rail must not pass a 6-inch sphere.
- Stairs: riser and tread rules are in section R318.7.
See also our pages on deck railing height and stair rise and run.
Do I need a permit to rebuild a deck in Humboldt County?
It depends on the deck and on where you live, and who issues the permit depends on your address, not your ZIP code:
- Unincorporated Humboldt County: the county building department. The county describes work that does not need a building permit in Humboldt County Code §331-11(a)(4) and California Building Code §105.2. See also the county's page on applying for a building permit for the first time.
- Inside the City of Eureka: the city's own Building Division, which takes applications through its online platform. Arcata, Trinidad, Rio Dell, Fortuna, Ferndale and Blue Lake also have their own city departments.
- Trinity County: the Community Development Department, Building Division. The county posts a building permit application for download.
A Eureka mailing address does not always mean you are inside city limits. Our page on a Eureka ZIP code with a county permit explains how that works. Coastal properties can also need a coastal development permit.
Is it worth rebuilding instead of patching?
That is your call, and it should be made with the facts in front of you. A rebuild is a chance to:
- fix the parts that hold water,
- bring the railings and stairs up to current code, and
- rethink the layout, like a wider stair, a better connection to the yard, or room for a table.
Some of our deck work, including the before and after shown here, is in our work gallery.
Frequently asked questions
How do I know if my deck needs to be rebuilt or just repaired? Soft or decayed framing, posts, or house attachment, and railings that move, usually point to a rebuild. Problems limited to a few surface boards may be repairable. An in-person look is the only way to be sure.
How high does a deck railing have to be in California? Under the 2025 California Residential Code, required guards must be at least 42 inches high. On the open sides of stairs, they must be at least 34 inches high, measured from the line of the nosings.
When does a deck need a railing? When the walking surface is more than 30 inches above the floor or grade below at any point within 36 inches of the open edge (CRC R321.1.1).
Who issues deck permits in Eureka? Inside Eureka city limits, the City of Eureka Building Division does. In unincorporated areas, including some homes with a Eureka mailing address, the Humboldt County building department does.
Does Humboldt Bay Construction Co. rebuild decks in Trinity County? Yes. The company works across Humboldt and Trinity County.
Talk to us about your deck
Humboldt Bay Construction Co. is a licensed general contractor based in Eureka (CA Lic. #1137566, B, General Building), owned and run by Kyler Gouthier. We build new decks, stairs and railings, and rebuild old ones across Humboldt and Trinity County.
Request an estimate or call or text Kyler at (707) 273-7594.