Roommate crosses the line by using my expensive equipment without permission - AITA?

AITA for refusing to let my roommate use my expensive equipment without permission? Roommate used it without asking, thinks it's no big deal, I disagree.

Jesse

Published in Interesting
1 Apr 2026

Roommate crosses the line by using my expensive equipment without permission - AITA?

Some roommate conflicts start small, then blow up fast when one person crosses a line. That is exactly what happened here, after a 28-year-old man caught his 27-year-old roommate using his expensive equipment without permission.

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He says he had already made the rules clear, the gear was delicate, and the cost of damage was no joke. She argued that it was an urgent one-time need for a project, while mutual friends split over whether he was being too strict about sharing in a home they both pay for.

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Now the whole situation comes down to one familiar question: where does being considerate end and respecting boundaries begin? Read on.

Original Post

I (28M) live with my roommate (27F), and we generally get along well. We split bills evenly and respect each other's space.

I have some expensive equipment for my hobby that I keep in my room. I've made it clear to my roommate that she can use it with my permission, but she should never do so without asking first.

Recently, I came home early from work and caught my roommate using my equipment without permission. She claimed she needed it urgently for a project and thought it would be okay.

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I was upset because she knows the rules, and the equipment is delicate and costly to repair if damaged. I calmly asked her to stop using it immediately and reminded her of our agreement.

She got defensive, saying she didn't think it was a big deal since it was just a one-time thing. I explained that it wasn't about the frequency but the principle of respect and trust.

Now, she's upset with me for making a big deal out of it and says I'm too uptight about my stuff. Some mutual friends agree with her, saying I should be more lenient with sharing since we live together.

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But I believe boundaries are essential, especially for expensive and fragile belongings. AITA for standing my ground on this, or should I have been more understanding of her situation?