In most cases, yes. Uninsulated floors, especially older suspended timber ones, can account for a surprising amount of heat loss. Insulating helps retain heat, reduces how much you need to heat your home, and makes floors noticeably warmer underfoot.

It also helps prevent cold bridging, and can support a better EPC rating, which matters for future saleability, letting, and upcoming regulations. For homeowners looking at energy-saving improvements, it’s often a practical, cost-effective place to start.