While soundproof underlay is a bit of a misnomer, we are able to provide and install sound-reducing underlay. Our carpet underlay is particularly good for reducing noise, and there are options for floating wood floors on underlays too.
Depending on the results you wish to achieve, (and crudely, how much you are happy to spend) there are additional solutions we can provide that will reduce airborne and/or impact noise.
It is worth noting that true soundproofing is achieved by removing movement in sub-floors, filling voids and installing various layers of materials at different densities; very rarely can one layer alone make a similar impact.