All materials have doubled or trippled. Wood composite all building materials are up. If you can obsorb the cost go ahead or wait but who knows when that correction will come

Even if you were to do it now there are also material shortages so not all may be currently in stock. If you proceed, all material should be ordered and stored where you have access to it before you start rather than risk your choices not being available and having to switch gears, possibly to even more expensive material.

I would wait. I just bought 8 foot treated posts for fence and gagged at the price. I'm going to wait before buying the rest of the fencing. It won't go back to old prices but might be more reasonable next year.

I work at a lumber yard in Pennsylvania as a deck installer and have done so for years And have kept a close eye on pricing. Prices will not be going down anytime within the next year. Mills do not generally keep any Excess stock on hand. The combination of increased saving, desire to complete home projects, and 8 plus months of initial production drop/stoppage in the initial stages of covid created high prices. Low interest rates continue to drive home building and thus keep prices high. we’re buying lumber at a higher cost on the day we sell the previous purchase and still make money. It’s going up and up and until interest rates increase and talk of infrastructure bills go away prices are only climbing. I’d suggest you buy today. Or wait a few years....