If you have ever tried designing a room from scratch, you might have noticed that it ends up either too small to use comfortably, or awkwardly too large. The problem isn’t with your creativity, but with the scale. Inexperienced designers tend to size rooms based on how they look rather than how they feel. Your couch may look perfect in your drawing, but in real life it might block the entire pathway. Your dining table may look great, but you forgot to leave enough space between it and the wall to push the chairs back. The best way to correct this issue is to start your design with something that has a real-world size you are familiar with. Use a bed, or a standard door size, as a reference point and design everything else relative to it.
Try this exercise: Draw a rough rectangle to represent the dimensions of your room. Place a single object in that rectangle at a size you think is realistic. Then try walking your pencil around it, leaving enough space to move around it as you would in the room. That last part is important because we don’t experience rooms as static images, we live in them. When the room starts to feel too small, don’t just shrink down all the furniture. Either make the room larger, or remove some furniture until you can comfortably navigate around everything.
A common mistake is to push all the furniture against the walls to make the center of the room feel “more open.” While this might succeed in making the center of the room look emptier, it can also make the proportions of the room feel awkward, and tends to result in wasted space in the corners. Sometimes bringing one large object a little ways into the room can help define a better overall shape and create more useful areas within the room rather than just an open perimeter. If the room suddenly feels like it makes more sense, then your original design didn’t have a structural element, not floor space.
For a quick exercise, take a few minutes to measure the size of any room you happen to be in by pacing it out with your feet, or measuring it in arm spans. Transfer your rough measurements to a piece of paper and sketch an arrangement different from the real one, but using the same dimensions. This exercise will help your brain learn to distinguish the logic of the layout from the decor, and will also help you internalize the true size of common objects.
When you get stuck, it’s usually because you aren’t sure what you want to prioritize, not because you’ve run out of ideas. Decide what you need to use the room for (to sleep, to socialize, to work, to move through, etc.) and design the room around that purpose. You can fit in secondary functions afterwards. With practice, this process will help you to transform the layout from something you have to guess at into a purposeful structural design where every decision serves the way you intend to use that space, rather than simply the way you want it to look.