Current policies might not be helping US EV adoption, but research suggests there’s another big reason that’s a lot closer to home—the junk in your garage.

A new report from strategic communications firm Telemetry, spotted by Ars Technica, finds that though many Americans have the capacity to install their own EV chargers, they simply can’t make room.

“90% of all houses can add a 240-volt outlet near where cars could be parked,” said Telemetry’s VP of Market Research, Sam Abuelsamid. He thinks that as a result, “whether homeowners use a private garage for parking or storage will likely become a key factor in EV adoption.

“Today, garage-use intent is potentially a greater factor for in-house charging ability than the house’s capacity to add 240-volt outlets,” he added.

The report highlights research from the National Renewable Energy Laboratory, which found that an estimated 42% of homeowners park near existing electrical access that can work with a Level 2 charger, though it might need modification.