Decking guides

Everything below is priced from the same product data the configurator quotes with, and every example deck opens live so you can edit it.

• Composite vs timber decking: what it actually costs

  Board prices, cost per square metre, and the whole-deck numbers for the same 17 m² deck built two ways.

• Joist spans explained

  Span, centres and section depth — the three numbers that decide your subframe, and how to read a span table without getting it wrong.

• Ground frames vs posts: which foundation does your deck need?

  The height at which a deck stops being a ground frame and starts being a structure on posts, and what that changes in the bill of materials.

• The Millboard range, explained

  Which Millboard board width and colour to choose, what the edging and subframe add, and current prices for the whole range.

• Decking around a tree

  Clearance, framing and trim for a tree opening, with an example deck whose hole you can drag to size.

Plan your own deck