Whitespace is the only design element that everyone in the room feels qualified to have an opinion about, because it looks like the absence of work. It is not. It is the mechanism by which everything else becomes legible.
Space is hierarchy
Proximity is the strongest grouping signal available, stronger than colour, a border or a heading. When elements sit closer to each other than to anything else, the eye reads them as one thing. Most hierarchy problems are not font-size problems; they are spacing problems, and adding a larger heading rarely fixes them.
The real objection
"It looks empty" almost never means the layout is wrong. It usually means someone is anxious that a stakeholder will ask why their section is not visible without scrolling. That is a political problem wearing a design costume, and it is best answered with a scroll-depth chart rather than with a compromise.
Density is not the same as information. A page can carry more and communicate less.
A practical rhythm
Work from a single spacing unit, eight pixels being a reasonable default, and allow only multiples of it. The constraint removes the endless micro-negotiation of whether something should be fourteen or sixteen pixels, and produces a page rhythm that reads as intentional even to people who cannot say why.
- Space between sections should be roughly three times the space within them.
- Line length between 55 and 75 characters; longer is where reading comprehension starts to fall.
- When a layout feels cluttered, remove an element before reducing space.
- Visual design
- Hierarchy
- Craft
