The Hidden Cost of Poor Layouts

Last week I was asked to quote on a couple of projects. And I spotted an issue that often comes up. There is a focus on tile selections, tapware, appliances etc, but the floor plan still needs work.

A lot of new build floor plans tick the buildability and council compliance boxes. But often, the layout needs refinement.

Interior designers obsess over floor plans as much as finishes because we design for useability - focusing on end users who will actually live in the space.

Professional design means:

• Traffic flow that makes sense

• Strategic adjacency (kitchens near dining, bedrooms near bathrooms)

• Smart zoning between public and private

• Minimal wasted circulation space

• Natural light and ventilation

• Furniture placement to inform design

• Joinery and lighting integrated, not afterthoughts

• Borrowed space - think visual connection indoors to outdoors that makes rooms feel bigger

• Views and sightlines considered

• Treats materials as part of the spatial design, not as separate elements

Now, the maths. A well-resolved floor plan = smaller footprint = lower build costs = better user experience. A thoughtfully designed 160m² outperforms a mediocre 180m² every time. At $2,500/m² build cost, the difference between 180m² and 160m² is $50,000 per dwelling. That's substantial.

Floor plan optimisation is foundational. Beautiful, expensive finishes can't fix a poor layout—but a sharp layout makes everything else work harder.

Have you seen a floor plan redesign transform a project?