What Does a Custom Carport Cost in Snohomish & King County? (2026 Guide)

If you’re pricing out a carport for your Snohomish or King County property, the range you’ll see online is wide — and for good reason. A carport can be a basic prefab kit or a fully custom wood structure built to match your home. Here’s what actually drives the number, and how to get a figure you can plan around.

Kit Carport Pricing

Prefab kit carports, usually metal, are the cheapest option: typically $5 to $20 per square foot for materials, or roughly $15 to $30 per square foot installed. NW Structures doesn’t sell or install kits. We build wood carports framed on-site, and that’s what the rest of this guide covers.

Wood Carport Pricing

Wood carports cost more to build — typically $15 to $30 per square foot installed, or $10 to $20 per square foot for materials alone. The labor is more specialized, since a wood frame is usually built to match the house rather than assembled from a kit. Overall, custom wood carport projects land somewhere in the $3,000 to $18,000+ range depending on size, design, and materials.

These figures are general market data, not a quote from NW Structures — every lot and design is different. The only way to know what your project costs is a site-specific written estimate.

What Actually Drives the Cost

• Size. A single-car carport costs a fraction of a build sized for an RV or a boat.
• Attached vs. freestanding. Attaching a carport to your house or garage adds engineering and tie-in work that a standalone structure doesn’t need.
• Site prep. A sloped lot, existing concrete, or drainage work can add cost before the structure itself even starts.
• Snow and wind load. Western Washington’s building code accounts for our wet winters — a carport engineered for real snow load costs more than a bare-minimum kit, but it’s the difference between a structure that holds up and one that doesn’t.
• Permits. Requirements vary by jurisdiction — Snohomish County, King County, and individual cities each handle accessory structures a little differently. Your builder should pull the right permit for your specific address rather than assume one county’s rule applies everywhere.

Why We Build Carports in Wood

A kit is the faster, lower-cost option. Wood costs more but blends into a property the way a kit carport usually can’t: it’s framed on-site to fit your lot and finished to match your siding, trim, and roofline, so it looks like part of the house instead of something dropped beside it. That’s why every carport NW Structures builds is wood.

This is the same reasoning that goes into any accessory structure on your property — it’s worth weighing against a fully enclosed garage if you want security and storage, not just covered parking. We build both, along with the custom carports and garages that make up a big part of our work across Snohomish and King County.

If you’re comparing builders, ask to see recent local work and get everything — site prep, permitting, and the structure itself — in one written number. That’s the only way to compare two quotes apples-to-apples. NW Structures is a family-owned shed, garage, and ADU builder based in Snohomish County, and we build carports on-site rather than dropping a prefab kit on your lot.

Common Questions We Hear

Do I need a permit for a carport? In most cases, yes — but the threshold and process depend on your jurisdiction and the structure’s size. Some smaller, fully open carports may fall under different rules than an enclosed or attached one. Don’t assume; check with your county or city before you build, or ask your builder to confirm before pricing the job.

Can I attach a carport to my existing garage? Usually, yes. Attaching to an existing structure can actually simplify the footing and roofline work compared to a freestanding build, though it does mean matching your existing roof pitch and siding if you want it to look built-in rather than bolted-on.

How long does a carport take to build? A straightforward wood carport is typically a matter of days once permits are in hand and materials are on-site. Custom, attached builds with more site prep take longer — your builder should give you a realistic timeline as part of the estimate, not just the sticker price.

Will it hold up to our winters? That’s the real question, and it’s why we don’t recommend the cheapest big-box kit for anyone who wants the structure to last. Western Washington’s snow load and wind requirements exist because a carport that isn’t engineered for them can fail in a bad winter — ask any builder for their structure’s rated snow load before you sign anything.

Get a Real Number

Every lot is different, and the fastest way to know what your carport will actually cost is a site visit and a written estimate. Reach out to NW Structures and we’ll walk your property, talk through size, roofline, and finishes, and give you a number you can plan around — not a range pulled from a national average.