Every beautiful room tells a story, and behind that story is a quiet set of principles guiding how a space looks, feels and lives. Design is never a one-size-fits-all discipline, and in my professional experience, personal style is always the compass. But understanding a few timeless fundamentals is what separates a room that looks almost right from one that feels complete.

Here’s my honest take on the design rules worth keeping, and the ones not to lose any sleep over.

Create flow with repetition, not matching

One of the most effective ways to make a home feel cohesive is to repeat key materials, finishes or colours as you move from room to room. Notice I wrote repeat, not match. There’s an important distinction. Matchy-matchy rooms feel flat and a little dated, while rooms with thoughtful repetition feel intentional and alive.

Think of it as a thread running quietly through your home. A warm brass finish that appears in the kitchen, resurfaces in a bedroom lamp and appears again in a bathroom fixture creates a sense of continuity without making every room feel like it belongs in the same furniture catalogue.

Respect the traffic zones

This rule sounds technical, but it’s really about comfort. For main walkways and pathways through a room, allow at least 30 to 36 in. of clear space to move. Furniture that crowds a room doesn’t just look wrong, it feels wrong the moment you try to move through the space. Generous breathing room around larger pieces keeps the space feeling balanced rather than like an obstacle course.

Follow the ‘coffee table rule’

Here’s a guideline I return to time and time again: Your coffee table should be approximately two-thirds the length of your sofa, and positioned roughly 16 to 18 in. from the front of your seating. It sounds precise, but the result is a layout that feels effortlessly proportioned – functional enough to reach your drink from your seated position and visually anchored enough to hold the room together.

Everything does not have to be perfectly symmetrical

Symmetry has its place – flanking a fireplace with identical sconces, for instance, is a classic go-to, for good reason. But a room that’s too symmetrical can be counterproductive, feeling stiff and uninviting. Don’t be afraid to go slightly off-balance. An asymmetrical arrangement of art, one oversized chair instead of two matching ones, or a floor lamp positioned unexpectedly can add the kind of quiet tension that makes a room genuinely interesting.

Think patterns are too risky to mix? Think again

This is the rule I hear most often, and the one I love to overturn every time. Done well, pattern mixing is one of the most sophisticated things you can do in a room. The secret to success? Vary the scale, and yes – there’s a rule for that. Pair a bold, oversized statement print with a medium geometric or classic stripe, then layer in a smaller textural pattern to ground it. What ties the mix together isn’t size, it’s colour. When a consistent colour story runs through each pattern, the result feels curated and confident, not chaotic.

At its best, interior design is a conversation between rules and instinct. The principles exist to serve you, not limit you. Learn them, lean on them when you need confidence, then trust yourself enough to know when to set them aside. That’s where the real magic happens.

Pro-tip

When layering fabrics and prints, I work to a simple formula: Aim for roughly 60-per-cent solids, 30-per-cent subtle patterns or textures, and 10-per-cent bold statement prints. This ratio creates depth and personality while keeping the overall scheme feeling timeless rather than overwhelming. The trick is always to repeat at least one colour across every pattern in the room. That single thread of continuity is what transforms a busy mix into something that looks genuinely considered.