Our garden rooms are not only durable, but also ZERO maintenance. And we use plastic coated galvanised steel not just on the exterior walls, but also on the roofs too. And this, as well as the way we design and build them, enables us to give you... A 30 year guarantee (inland) and a 25 year guarantee (coastal) for the exterior cladding of your Elgar Garden Room. That's how much we believe in our product. No other company we've heard of offers this length of guarantee. So, what's not to like! Some companies, for instance, use EPDM, a rubber roof covering. That's fine until, for instance, a bird pecks open a hole or an object or even a person creates a small cut (which can be easily done). Then it's not properly waterproof anymore and this in turn starts to adversely affect and undermine the roof structure too. Not good! And then there's also the fact that this material can somtimes and even often start to break down after about 10 years.