Dear All, We do alot of wooden planter deckings, mainly Ashwood and Chengai. There are many factors that contributes to the pricing for decking. 1. Quality of wood. Yup, probably get a lot of that. The thing is, we seldom come across a hundred year old tree nowadays. However, there are treatments to make it more durable. Firstly, insist on Kiln dry wood. It dries up the moisture from the wood so that it is more resistant to termite attacks and such. All our wood are also stored for at least 6 mths to air dry before using it to fabricate into deckings. Air drying encourages the wood to 'expand' to its maximum potential so that it prevents warping. 2. Installation methods Some contractors will install the reinforcements of the decking by directly securing it onto the wall. This is NOT allowed for external walls. Nailing into the walls can cause hairline cracks that cause costly and troublesome waterproofing issues to the building. contractors does this to save on labor and material cost. Decking should be prefabricated in the factory and assembled on site so that cutting is more uniformed. I strongly encourage that deckings are made removable to clear drain clogs and general cleaning. 3. For smaller areas, usually there's an additional charge. So if u have more than one area to deck, it's more economical to do it at one go. As for maintenance, it's usually advised to have ur decking revarnished once a year. WPC does not require maintenance, but the color usually fades and it's very hot to step on with a 'sticky' feeling. This is just a general feedback from customers. I'm not condemning WPC. I'm sure there will be a few good brands out there. I hope my very long post will answer most of the questions out there! Good luck with ur home renovations! God Bless!