It depends on the size, fabric, number of posts and site conditions. A small sail between existing walls costs less than a large sail on new posts. Send through a quote request for a price.
Standard shade cloth lets some rain through; PVC sails are fully waterproof.
Quality shade cloth blocks a high percentage of UV; the exact figure depends on the fabric and colour.
Many residential sails don't, but some sites and sizes do. Check with your local council before installing.
In very high winds it's a good idea to release the tension or take the sail down.
Fill in the form and a local shade sail installer will get back to you. No obligation.