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Trex Deck Designer

Free, brand-locked

Free 3D deck planner locked to the Trex composite catalog

Free tier & pricing

Completely free with no payment and no export paywall, but every board, railing and SKU it prices is a Trex composite product, so the shopping list only works if you actually buy Trex.

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Last verified Jun 23, 2026. Report a change →

Trex Deck Designer home page screenshot Visit site

The short answer

Trex's free browser-based 3D tool lets you size a square or rectangle deck, choose Trex composite boards, railings and lighting, then download a shopping list and a printable rendering you can share with a contractor or planning office. It only models Trex products, runs on desktop only, and the material counts are estimates you should verify.

The facts

Pricing
Free · Free, brand-locked
Free tier
Yes
Runs in browser
Yes
Platforms
Web
2D / 3D
Good 3D
Learning curve
Easy
Export formats
PDF, PNG

The catch

  • Designs only with this brand’s own catalog.
  • Desktop install only — no browser version.
  • You must create an account to save or export.

Pros & cons

Pros

  • Genuinely free, no credit card, unlimited designs
  • Exact Trex SKUs, quantities and a cost estimate in the shopping list
  • Generates a printable blueprint usable for permit and contractor conversations
  • Lets you set joist/beam lumber size under Substructure Options

Cons

  • Locked entirely to the Trex product catalog
  • Only square and rectangle deck shapes (plus multi-level)
  • Desktop/laptop only, not built for phones
  • Material list is a self-serve estimate, not a verified takeoff; order extra

Best for

Homeowners committed to Trex composite who want a contractor-ready shopping list.

Not for

Anyone using wood or a non-Trex brand, or needing curved/freeform deck shapes.

Alternatives to Trex Deck Designer

TimberTech / AZEK Deck Designer screenshot

TimberTech / AZEK Deck Designer

Free, brand-locked

Free to design, save, compare and download a materials take-off, but the take-off only covers AZEK/TimberTech parts and starting a project signs you up for dealer and contractor outreach.

Web, iPadOS Free
 Decks.com Deck Designer screenshot

Decks.com Deck Designer

Free, with limits

Free to design and download plans plus a suggested material list after a free signup, but you cannot change the framing lumber sizes and the materials are a suggested list, not a guaranteed takeoff.

Web Paid
 Fiberon Discovery Deck Designer screenshot

Fiberon Discovery Deck Designer

Free, brand-locked

Free with unlimited designs and a downloadable bill of materials, but the BoM is explicitly an estimate and every component is a Fiberon product.

Web, iOS, Android Free

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Head-to-head comparisons