Composite Decking Calculator

Each CDW composite decking board covers 0.533 m² (3.6m long x 0.148m wide). That means you need approximately 1.88 boards per square metre of deck. Our calculator rounds up to the nearest whole board to ensure you do not run short.

The calculator provides a base board count for a standard rectangular area. For decks with diagonal laying patterns, angled cuts, complex shapes or multiple levels, we recommend adding a 10% waste allowance on top of the calculated figure. If you are unsure, contact us and we will advise on quantities for your specific project.

CDW composite decking boards are 3.6 metres long and 148mm (0.148m) wide, giving a coverage area of 0.533 m² per board. They are available in five finishes - Teak, Chocolate, Silver Grey, Graphite Grey and Charcoal Black - all priced at £16.50 per board.

At £16.50 per board with 0.533 m² coverage, CDW boards cost approximately £31 per square metre for boards only. This does not include subframe, fixings, edging or installation. For a full material list or supply-and-install quote, contact us or use our Essex installation service page.

Yes. If you enter your name, email address and phone number before submitting the form, we will email your results to you so you have them to hand when ordering or getting further quotes. These fields are optional - you can get your result without filling them in if you prefer.

Yes. We offer a free sample box containing physical samples of all five board finishes. Board colours look meaningfully different on screen versus in natural daylight in your garden, so we strongly recommend ordering samples before committing to a colour. Order your free sample box here - no obligation.

Yes. We supply boards nationwide with express delivery in 5 working days. For customers in Essex, we also provide a full supply-and-install service covering subframe construction, board laying with hidden clip fixings, edging, finishing and waste removal. Find out more about our Essex installation service.