Before you buy a single board, you can see your finished deck in 3D, rotate it, change the color, and get a shopping list, all from your couch. That is what deck design software does, and the best part is that most of the good tools are free.
This guide compares the top free deck designers and online planners, from the big composite brands to store planners and full 3D modelers. Then it walks through how to design your deck in 3D, step by step, so you end up with a plan you can actually build.
We design and build decks across the Indianapolis area, and a good design tool makes the whole process smoother, whether you build it yourself or hand it to us.
What Deck Design Software Does
Deck design software, sometimes called a deck designer or deck planner, lets you draw your deck to scale, see it in 3D, and get a list of everything you need to build it. It turns a rough idea into a real, buildable design.
The best tools share a handful of features:
- Draw to scale. Set your exact dimensions so the design matches your yard and your door height.
- See it in 3D. Rotate a realistic model to preview the finished deck from every angle.
- Try materials and colors. Swap boards, railings, and colors instantly to compare looks.
- Get a material list. Many tools generate a shopping list and a rough cost estimate.
- Export a plan. Save or print a plan you can use to build or to apply for a permit.
The Best Free Deck Design Tools
You can design a great deck without paying for software. Here are the best free deck design tools, most of them web-based and 3D.
| Tool | Cost | 3D | Type | Best for |
|---|---|---|---|---|
| Trex Deck Designer | Free | Yes | Web | A composite deck with a cost estimate |
| TimberTech 3D Designer | Free | Yes | Web | Custom shapes and realistic 3D views |
| Fiberon Discovery | Free | Yes | Web | Homeowners and trade pros |
| Decks.com Designer | Free | Yes | Web | DIY planning with printable plans |
| Lowe’s Deck Designer | Free | Yes | Web | Shopping your materials at Lowe’s |
| SketchUp Free | Free | Yes | Web | Flexible 3D modeling, steeper to learn |
| MiTek / DIY Deck Designer | Free | Yes | Download | Detailed, down-to-the-fastener lists |
| Chief Architect, ZWCAD | Paid | Yes | Download | Pros and complex, multi-level builds |
Tool details are current as of 2026 and can change. Confirm features and pricing on each provider’s site before you rely on them.
Decking Brand Designers (Trex, TimberTech, Fiberon)
The big composite brands offer free, web-based 3D designers. Trex, TimberTech, and Fiberon each let you build a deck on screen, choose their boards and colors, and get a material list with a cost estimate. They are the easiest way to see a real, buildable deck, with the catch that they feature that brand’s products. If you like what you design, read up on the composite boards these tools model so you know what you are choosing.
Retailer Planners (Lowe’s and Home Depot)
Home-improvement stores offer free planners tied to their inventory. Lowe’s Deck Designer lets you lay out a deck and generate a materials list you can buy in-store, and Home Depot has offered similar planning tools. These are handy if you plan to shop at that store. Availability and features change, so check the current site before you start.
General 3D Modeling (SketchUp)
SketchUp Free is a flexible, browser-based 3D modeler. It is not deck-specific, so it can do more but asks more of you. It is a good pick if you want full control over the design and do not mind a learning curve.
Downloadable Deck Software
A few free programs you download, like MiTek Deck Designer and the Do-It-Yourself Deck Designer, focus on detailed material lists, sometimes down to the fasteners. They are less polished than the web tools but strong on the buildable details a DIYer needs.
Professional CAD Software (Paid)
For complex or multi-level builds, professional programs like Chief Architect and ZWCAD offer full precision and engineering detail. They cost money and take time to learn, which is why they are aimed at pros rather than weekend builders.
How to Design a Deck Online in 3D
Ready to try it? Before you open a tool, it helps to gather deck design ideas first so you start with a look in mind. Then design your deck in 3D from start to finish:
- Measure your space. Get accurate measurements of the area, and note the height of the door where the deck meets the house.
- Pick a tool. Start with a free web designer. A brand or store tool is the easiest choice for a first design.
- Draw the footprint to scale. Enter your real dimensions so the on-screen model matches your yard exactly.
- Add levels, stairs, and railings. Build up the structure the way you want it, including any change in height.
- Choose materials and colors. Try different boards and finishes until the look feels right.
- View it in 3D and adjust. Rotate the model, spot what does not work, and fine-tune before you commit.
- Export the plan and material list. Save your plan and shopping list. That export is what lets you turn your design into a buildable plan and price the job.
With a design and a material list in hand, the last step is construction. When you are ready, how to build it once it is designed covers the build from footings to railings.
How to Choose the Right Deck Design Tool
With so many options, keep it simple. For most homeowners, a free brand or store designer is all you need. Choose based on a few things:
- Your skill level. Brand and store designers are the easiest. SketchUp and pro CAD ask more of you.
- Your materials. If you already know your boards, use that brand’s tool. If not, a store planner keeps your options open.
- What you need at the end. Want a shopping list? Pick a tool that makes one. Need a permit drawing? Make sure you can export a plan.
- 3D or 2D. If seeing the deck matters to you, choose a 3D tool. Most free ones now include 3D.
Frequently Asked Questions
What is the best free deck design software?
For most homeowners, a free brand designer like Trex or TimberTech, or a store tool like Lowe’s Deck Designer, is the best starting point. They are web-based, 3D, and generate a material list. SketchUp Free is the pick if you want more control.
Can I design a deck online in 3D for free?
Yes. Several free, web-based tools let you design a deck in 3D without installing anything, including the Trex, TimberTech, Fiberon, and Decks.com designers.
Does Lowe’s have a deck designer?
Yes. Lowe’s offers a free Deck Designer that lets you lay out a deck and generate a materials list you can buy in-store. Features can change, so check the current Lowe’s site.
Do deck design tools give you a material list?
Many do. The brand and store designers usually generate a shopping list, and some add a rough cost estimate. Downloadable tools like MiTek are especially detailed about materials.
Do I need software to design a deck?
No. You can design a deck with graph paper and a pencil. Software just makes it faster, lets you see the deck in 3D, and often builds the material list for you.
Can I use a deck design for a permit?
Often, yes, if the tool lets you export a plan with dimensions and framing details. Check that the drawing meets what your local building department requires before you submit it.
The Bottom Line
Deck design software takes the guesswork out of the biggest decisions before you spend a dollar. Most homeowners can design a beautiful, buildable deck for free with a brand or store designer, see it in 3D, and walk away with a material list. Pros and complex builds are where paid CAD earns its cost.
The next step is easy: pick one free tool, measure your yard, and spend an hour designing. You will learn more about what you want in that hour than in a week of scrolling photos.
A tool can draw the deck. Turning that design into a solid, finished structure is where the real work begins.
If you would rather hand off the whole thing, Platinum Deck and Patio designs and builds custom decks across the Indianapolis area, and we can turn your idea, or your 3D design, into a finished deck. Call us at (463) 466-5870 to get started.