What is the spacing of balusters for building regs?

In the UK, building regulations state that the spacing between balusters should not exceed 100 millimeters (4 inches) to prevent the passage of a 100 mm sphere, ensuring safety, especially for children. This requirement applies to both staircases and guardrails. Additionally, the overall height of the guardrail should be at least 1 meter for stairs and 1.1 meters for balconies. Always consult local regulations as they may vary slightly.