I Always Use the “3-Room” Rule to Buy Decor (It’s Saved Me Thousands)

published Sep 3, 2025
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Couch and Leather lounge chair in a white living room.

If there’s only one thing I’ve learned about home decorating that’s stayed true over many years, it’s that my home is constantly evolving. I’ve found that for nearly all homeowners, the space you design when you first move in versus years (or even months) later is very different. After all, you may be on the hunt for a comfortable mattress for a guest bedroom this year — only to make way for a sturdy pull-out couch in the living room as a family expands, or more loved ones call on you to host.

Once upon a time, I decorated my house so carefully that I obsessed over every nail hole, measured twice (twice more before even attempting a room makeover!), and analyzed my color choices so much that I often ended up steering away from buying anything at all. It felt like an endless cycle.

Then, I got tired of living in an under-decorated, underutilized space. I stopped designing as though one day I might actually be done, and I started designing the home I needed now (or then, as it was). I accepted that changes would invariably come — lots of changes!

I started moving things around — and often! It started with floor lamps and picture frames, then I swapped area rugs and console tables. I realized that you often don’t need more stuff to make a space feel fresh — you just need flexibility! That’s how I found myself following what I now call the 3-Room Rule: You only buy decor you can see styled in at least three different rooms in your home.

Credit: Erin Derby

What Is the 3-Room Rule?

Coming up with this tactic felt liberating, as it helped me focus on rethinking how I shop for home decor. It also pushed me to consider the decor I already owned and allowed me to maximize unused spaces, refreshing the overall look of my home along the way. It also saved me a ton of money.

Before I put a piece of decor in my cart to checkout, I literally picture where I’m going to put it when I get home, then I force myself to think through at least two other places that the item could work now, ideally, or later. You can apply this rule whether you’re shopping for a specific item, like a lamp, or something for a specific spot, like a hall table. If I can’t think of three other places around my house where it would work or fit, I don’t buy it

Over the years, I’ve followed this rule on both a large scale and a small scale. A sofa that started in my den next found a home in my living room, then later moved to my home office. The list and journey goes on and on for throw pillows, blankets, frames, vases, and all the other home decor staples you can think of. 

This rule has not only helped me better identify what I really need to buy before shopping, but it has also pushed me to create a cohesive design style along the way. Each room still has its own personality and palette, but because I can easily swap decor pieces around without them feeling out of place, I’ve created real cohesiveness for my home.

If you ask me, any rule that saves time and money — and helps you define your design style throughout your home — is a rule worth following! 

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