How do you know it is time to replace the roof instead of repairing it?
Look at how widespread the trouble is. One failed flashing or a few lifted shingles points to repair. Curling or bare shingles across a whole slope, soft boards, or leaks in several places point toward replacement. The roofer should look in the attic and put both options on paper.
Age on its own is a poor guide. No Washington-specific lifespan is printed on this site, because the published figures are general and a wet valley with shade and conifers is harder on a roof than the average. What counts is the condition of the surface and the deck below it.
Ask any roofer to give you the repair price and the replacement price side by side. If the repair would only buy you one winter, a written comparison makes that plain. The guide on signs an older roof is near the end walks through what to check from the yard and from the attic.
What happens to the old layers and the decking?
The old covering is stripped to the deck, hauled away and replaced. Rotten or stained boards are cut out and replaced with new sheathing before underlayment goes down. Whether that costs extra depends on the quote: ask how many boards it allows for, and how any additional boards are priced.
Some roofs have two or more layers because earlier owners put new shingles over old. Other Washington cities, such as Sammamish and Enumclaw, cap composition roofing at two layers and require a permit when all roofing or the sheathing is replaced. Those are their rules, not rules for Concrete or the towns around it, but they show why the layer count is worth asking about.
The thing no roofer can promise is what lies under the old covering. A roof that has leaked slowly at a valley for ten winters can look fine from above and have a stained, soft deck below. Honest quotes name that risk and say how it will be handled.
Which roofing material suits a house near Concrete?
Asphalt shingles and metal panels cover most of the houses here. Asphalt costs less up front and is easy to repair. Metal sheds snow and debris and resists moss, which suits a steep roof under tall conifers. The right choice depends on the roof pitch, the budget and how you feel about maintenance.
Think about where the roof sits. A roof under big firs collects needles, and needles hold water against asphalt. A steep roof in the upper valley takes snow loads that a lowland roof never sees. Metal handles both better than most coverings, although it brings its own details around snow release and fasteners.
The guide on metal or shingle roofs in the North Cascades sets the two against the weather in more detail, and does so without printing local snow-load numbers.
Does a roof replacement need a permit?
It may. Skagit, Snohomish and Whatcom counties and the cities inside them each set their own rules, and this page cannot state them. Ask the building department that covers your address whether the job needs a permit, and ask the roofer who will apply for it.
Because the service area crosses three counties, the right office depends on where the house is. A house in Darrington answers to Snohomish County rules and a house in Deming to Whatcom County, while Concrete itself sits in Skagit County. The permit guide lists the questions to ask.
Registration is a separate matter. Washington requires roofing contractors to register with the Department of Labor & Industries, and you can check a contractor before you sign. The registration guide shows how.