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Storage units in Mercer Island, WA, and nearby area - 30 listings with over 457 spaces

Prices start at just $12. See the latest Mercer Island storage market trends

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

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

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Need more options? Browse storage units in other Washington cities!

Browse storage units in all Washington cities.

Average storage prices in Mercer Island (updated April 2026)

With prices starting at $111, you’ll find everything from compact locker-sized units to large spaces for cars, RVs or household goods. The average monthly rate for a storage unit in Mercer Island is $385.

Prices typically vary depending on the unit size and whether it’s climate controlled.

Unit SizeNon-Climate-Controlled UnitsClimate-Controlled Units
5x5-$111
5x10-$215
10x10-$322
10x15-$433
10x20$502$502
10x30$460$460
Average (all sizes)$481$340

Note: Street rate data provided by Yardi Matrix.

Cheap storage units in Mercer Island

  • Small storage units (perfect for boxes, seasonal items, or a studio apartment) start as low as $111
  • Medium storage units (great for 1- to 2-bedroom homes) are available from just $305
  • Large storage units (ideal for multi-room moves or business inventory) start around $502
Cheap storage units
5x5 $111/mo

Storage Court - 8501 SE 68th Street, Mercer Island, WA 98040

Cheap storage units Cheap storage units
10x10 $305/mo

Storage Court - 8501 SE 68th Street, Mercer Island, WA 98040

Cheap storage units Cheap storage units Cheap storage units
10x20 $502/mo

Storage Court - 8501 SE 68th Street, Mercer Island, WA 98040

Types of storage available in Mercer Island

Standard Non-Climate Controlled Units: Non-climate-controlled storage units are suitable for items that aren't sensitive to humidity or temperature fluctuations. These units may be located either inside a building or outdoors – outdoor units often feature drive-up access for convenient loading and unloading.

In Mercer Island, you can rent a non-climate-controlled storage unit for an average of $481 per month.

Climate-Controlled Units: Climate-controlled units maintain consistent temperature and humidity levels year-round, protecting everything from electronics and wooden furniture to antiques, artwork, books and important documents.

You’ll find 1 self storage facility in Mercer Island offering climate-controlled units in a variety of sizes and price points.

The average rate for a 10'x10' climate-controlled storage unit in Mercer Island is around $322 per month — a smart investment to ensure your valuables stay protected.

Vehicle Storage Options: Perfect for outdoor adventurers, seasonal travelers and classic car collectors, specialized storage spaces offer a secure place to store cars, SUVs, vans, RVs, boats and other types of vehicles.

RV Storage in Mercer Island

Mercer Island offers both covered and uncovered RV storage options to protect your motorhome from snow, hail and sun exposure. Sizes vary depending on the type of RV, with many facilities offering 24/7 access for road trip flexibility.

RV storage spaces in Mercer Island start at around $358 per month, with prices depending on the level of protection you choose – whether that’s open-air parking, a covered shelter or a fully enclosed unit to keep your vehicle safe from the elements. Location and availability also play a role in the final cost.

👉 See current rates and available RV storage spaces in Mercer Island.

Boat Storage in Mercer Island

Boat storage in Mercer Island averages $299 per month, with rates depending on location, availability, and the type of space — outdoor, covered or fully enclosed. Many facilities offer secure access, room for trailers and wide drive aisles for easy parking. Whether for off-season or year-round storage, there’s a solution to fit your boat and budget.

👉 Check current prices and available boat storage units in Mercer Island.

How to choose the right storage unit in Mercer Island

Here are a few simple things to keep in mind when choosing a storage unit in Mercer Island:

  • Think about the weather
  • If you’re storing things like electronics, wooden furniture or photos, go with a climate-controlled unit to keep them safe.
  • Check when you can get in
  • Need late-night access? Some places offer 24/7 entry, while others stick to regular business hours. Make sure you pick a facility whose opening hours work for your schedule.
  • Make sure it feels secure
  • Look for places with gated access, security cameras and someone on-site. It’s your stuff — you want it protected.
  • Shop around for deals
  • Prices can vary a lot. It’s worth checking a few places – some even offer discounts for your first month.
  • See what others are saying
  • Online reviews can give you the real scoop on customer service, cleanliness, and how a facility treats its renters.
  • Don’t forget about insurance
  • Most storage places require it. Some offer it themselves, or you might already be covered through your renters or homeowners insurance.

Take a few minutes to check these things off your list, and you’ll be set up with a storage unit that actually works for you — without overpaying or guessing.

Frequently asked questions

How safe is self storage?

Most self storage facilities have some level of security, often including surveillance cameras and gated access. Popular security features include video surveillance and secure entry systems. Know that the facility comes with a strong security setup can give you confidence that your belongings are safe until you need them again.

Methodology Note: Self storage data - including pricing and unit information - is analyzed and curated by RentCafe Self Storage. Statements reflect local market coverage and storage availability trends within the area.

Data sources: RentCafe Self Storage Research, Yardi Matrix, U.S. Census.