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Car storage units in Mercer Island, WA, and nearby area - 13 facilities and 222 available spaces.

Prices start at just $293.

Not sure what size you need? See our size guide!

Not sure what size you need? See our size guide!

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Types of car storage

With 5 car storage units nearby, you’ve got some solid choices around Mercer Island.

A car storage facility in Mercer Island, WA may offer:

Outdoor storage

  • May be open or covered
  • Best for: Short-term storage or larger vehicles
  • Tip: Use a weatherproof cover for protection
Covered outdoor car storage

Indoor storage

  • Offers the highest level of protection
  • Often includes climate and humidity control
  • Ideal for long-term, luxury, or seasonal vehicles
Indoor car storage

What’s the best size for a vehicle storage space?

Choosing the right unit size depends on the type and length of your vehicle. Here’s a quick guide to help you pick the best fit:

Car storage sizes

10′ × 15′ – Best for compact cars and hatchbacks

  • Works well for vehicles under 15 feet long
  • Ideal for short-term or seasonal storage
  • Examples: Mini Cooper, Honda Fit, Mazda Miata

10′ × 20′ – Fits most sedans, crossovers, and small SUVs

  • A popular choice for everyday cars
  • Also fits small pickups with standard beds
  • Examples: Toyota Camry, Honda CR-V, Ford Ranger

10′ × 25′ – Good for full-size sedans, SUVs, and standard pickups

  • Allows extra space for larger vehicles or tighter maneuvering
  • Great for long-term storage or occasional access
  • Examples: Ford F-150, Chevy Tahoe, Dodge Charger

10′ × 30′ – Ideal for oversized vehicles

  • Accommodates vans, extended cab trucks, and long-bed pickups
  • Recommended for vehicles over 19 feet long
  • Examples: Chevrolet Silverado Crew Cab, Ford Expedition Max, Sprinter van

Tip: Always measure your vehicle (including mirrors or attachments) before booking to ensure a proper fit.

Specialized car storage options

If you're storing a vehicle that needs extra care – whether it's seasonal or high-value – some facilities offer features designed to go beyond basic storage.

Winter car storage

Planning to store your car during the colder months? Here’s what to look for:

  • Climate-controlled units with humidity control to prevent rust, mold, and battery issues
  • Indoor storage to protect against snow, ice, and temperature swings
  • Some facilities even offer add-on services like tire pressure checks, battery maintenance, or a basic wash before pickup

Tip: Store your vehicle with a full tank of gas and a trickle charger for the best results in winter storage.

Exotic and classic car storage

High-value or collector cars deserve a little more attention. Look for:

  • Climate- and humidity-controlled indoor storage to protect finishes and interiors
  • Limited-access or private units for added security
  • Optional maintenance or detailing services to keep your car in pristine shape while it’s in storage
  • Some premium locations offer vehicle preparation and startup services upon return

Good to know: Some facilities require advance booking for specialty storage, especially during peak seasons.

How to get your vehicle ready for storage

Before storing your car, be sure to:

  • Wash and wax to protect the exterior
  • Check and top off fluids (oil, brake fluid, coolant)
  • Fill the gas tank and add fuel stabilizer
  • Inflate tires to the proper PSI
  • Disconnect the battery or use a maintainer
  • Use a breathable, fitted car cover

What documents you need to store your car

Storage facilities may have specific requirements before you can store your vehicle:

  • Proof of ownership (vehicle title or registration)
  • Valid government-issued ID
  • Proof of insurance (some facilities require it even if your car is off the road)
  • Up-to-date registration (requirements vary by state and facility)

Tip: Always check with the facility in advance, as some will not accept vehicles with expired registration or no insurance. Read your lease agreement carefully and ask about storage-specific insurance options.

How secure your car is in self storage

When choosing a car storage facility, security is crucial. Here’s what to look for:

  • 24/7 video surveillance and monitored security systems
  • Gated access with keypad or card entry
  • Well-lit premises and secure fencing
  • On-site staff or regular patrols
  • Reputation for safety in the local community

Tip: Ask the facility about recent upgrades to their security and check online reviews for peace of mind.

Frequently asked questions

Can I put a car in a storage unit?

Yes – most standard vehicles fit in a 10′×20′ unit or larger. Be sure to measure your car and check height/width clearance (usually 7'8").