There are many different materials that you can use to build a pergola. You could use wood, metal, or a synthetic material. Using wood will give you a classic and timeless look, however it will require more maintenance over time and if you decide to stain the wood, it may need to be stained agan in the future. Metal is the most durable material, however it doesn't look as visually appealing and can get very hot to touch during the summer. Synthetic materials Synthetic materials like PVC and fiberglass are more expensive upfront, but are a great low-maintenance alternative to wood.