What is BIAB? The UK guide to Builder Gel in a Bottle
1 min read · Updated 17 Jun 2026
What BIAB actually is
BIAB stands for Builder Gel in a Bottle — a thicker soak-off gel applied like a normal gel polish but used to build a protective layer over the natural nail. It’s popular because it strengthens weak nails without the bulk of acrylic.
How long does BIAB last?
A BIAB set typically lasts 3–4 weeks before infills are needed. Because it’s soak-off, removal is gentler than hard gel or acrylic when done properly.
Infills vs full set
Most salons offer a cheaper infill appointment every few weeks and a full removal/re-application less often. Ask your tech what their infill policy is.
What should it cost?
Prices vary by region and experience. Check current community-shared prices in the Price Index before you book.