Building a Composite Deck?
Make it easy on yourself. Tell us the project specs and we'll put together a quick materials estimate.
Will your deck have railing? How we calculate railing

12' X 12' Deck design
(144 sq. ft.)
The perfect starter size, with plenty of room for an outdoor furniture set.

12' X 14' Deck design
(168 sq. ft.)
A few more feet sets the scene with space for a dining table.



12' X 20' Deck design
(240 sq. ft.)
Open up the layout, call the neighbors and let the party begin.

3m X 3m Deck design
(9 sq. m.)
The perfect starter size, with plenty of room for an outdoor furniture set.

3m X 4m Deck design
(12 sq. m.)
A few more meters sets the scene with space for a dining table.



3m X 7m Deck design
(21 sq. m.)
Open up the layout, call the neighbors and let the party begin.

Calculating Railing
One side of your deck borders your home. To keep things simple, we approximate railing costs for the remaining sides.
Decking Materials
(Choose from 8, 12, 16, or 20 ft board lengths. Choose which board best fits the dimensions of the deck. Make sure to order one square edge board for the outer edge of your deck.)
Board length | Boards required |
---|---|
8 FT | |
12 FT | |
16 FT | |
20 FT |
Trex® decking is available in 12, 16 and 20 ft lengths, with 8 ft decking available on shelf in select stores. Calculations provided for boards installed at a 90 degree angle. If laying boards on an angle, an approximate increase of 15% may be required.
Railing Materials
(Choose from 6 or 8 ft railing lengths)
Railing section size (on center) | Number of sections required | Number of posts, caps, skirts required per section |
---|---|---|
6 FT | ||
8 FT |
Trex Transcend® and Trex® Signature™ railing is available in 6 and 8 ft lengths. Trex Enhance® railing is available in 6 ft length only. You may prefer your railing posts in a different location that may then affect the railing lengths and number of sections required.
Trex Hidden Fasteners
(Both required)
Hardware | Number required |
---|---|
Starter Clips | Bag(s) |
Trex Hideaway® Hidden Fasteners |
Box(s) |
Calculations provided for boards installed at a 90 degree angle. If laying boards on an angle, an approximate increase of 15% may be required.
The above estimate is for comparison purposes and does not account for substructure or labor. Square footage may vary depending on the placement of stairs, curves or additional features. Because all decks are custom-built, every project requires a personalized estimate.
Almost There.
Enter your information to recieve a full price and materials breakdown.
*Required