What to Know Before You Build Your Own Deck

Wondering about whether or not to build your own deck? With the right expectations, know-how, and resources, building your own deck can be an enjoyable and cost-effective option.  

To help you ask whether it might make sense to build your own deck, we’ve assembled top DIY tips and considerations on: 

• Assessment of an existing substructure, project scope, and materials. 
• Consideration of build variables like tools, labor, and timeline.  
• Familiarizing yourself with decking installation best practices. 
• Adhering to building codes and securing a permit. 
• Building a new substructure (if applicable). 

Step 1: Assess Substructure, Scope, & Materials 

Before you build your own deck, ask yourself these questions to decide whether or not you feel comfortable taking on the project. 

Substructure

• Will you need to build a new substructure from scratch?
• Do you have an existing substructure you’ll resurface?  
• Or, are you planning a bit of both by extending your deck? 

Whether you’re simply resurfacing your existing deck or adding on an extension, you need to fully inspect your substructure to ensure it is structurally sound.  

Common Substructure Issues  

During your deck inspection, check for common substructure issues, including:  

• Correct joist spacing and blocking 
• Mold, mildew, or rot 
• Loose or rusted fasteners 
• Bent or damaged joists 
• Joists out of plane 
• Insecure or rotted ledger board 

deck inspection

While minor issues with your substructure, such as loose fasteners or a few damaged joists can often be repaired, in most cases, it is best to replace the entire substructure. A newly built substructure ensures your new deck not only looks great, but also boasts safe, sturdy connections and lasts for many years to come.  

Scope: Deck Shape & Design

• What will your deck shape be? (Note: Your deck’s height and shape will also determine whether you need a building permit). 
• Will you lay your boards straight or go for a more complex deck pattern such as:  A picture frame border? Diagonal decking? 
• Will your deck need a railing (required when deck surface is at or above 30” inches from the ground)? 

Deck Material

• What durable deck material will you use for your build?  
• You likely want a material that is durable, beautiful, and straightforward to install.  
• Discover your DIY deck material options to determine the right choice for you and your build.   

Explore Your Cost to Build a Deck 

Discover how TimberTech delivers high-performance decking with exceptional long-term value.  

EXPLORE

Step 2: Consider Build Variables 

Should you opt to build your own deck, you will take on the role of not only laborer, but project planner and coordinator. A few factors to think through include: 

Get the Guidance You Need for Your Build 

Discover best practice guidelines and helpful videos for all parts of your deck build from substructure to decking installation, railing, and more.  

Deck building

Step 3: Get Familiar With Decking Installation

Before deciding to build your own deck, it’s a good idea to get familiar with the decking installation process to help you decide where you might need some assistance.  

Despite some variations in decking installation depending on deck material and fastener type, all installations will require:  

Step 4: Follow All Building Codes & Secure Permits 

If you feel comfortable with your answers to the questions above and the deck building process steps involved, you’re ready to get started with your project.  

Building Codes 101 

Building codes can affect design choices such as your deck shape and size, railing height and design, or whether your deck needs a railing at all.  

Regardless of whether you have an existing substructure or are building a new one, make sure your deck design is up to code. Review local building codes before confirming your design so you don’t run into any issues when trying to get your building permit.  

Building Permits 101 

Before you build your own deck, you likely need to acquire a building permit from your town or city hall. 

How to Get Your Permit 

You’ll need to bring a diagram of your deck with dimensions to your local building department, so they can confirm it will be built to code. Once they approve it, they’ll issue you the proper building permit.  

Start With a Plan 

Kickstart your deck design with one of our customizable deck templates in our 3D Deck Design tool. 

CUSTOMIZE YOUR PLAN

Step 5: Build Your Substructure (If Applicable) 

You’ll need to build a new substructure if you’re building a brand-new deck or if your existing substructure is beyond repair. Extending your deck will also require an additional frame built in connection with the existing substructure.  

Tips for building a substructure include:  

• If in a cold or four-seasons climate, using frost-proof footings to set your posts in.  
• Ensuring proper deck joist spacing, making sure joists are level and in plane with one another and across the tops. 
• Attaching the ledger board with the appropriate screws. 

Step 6: Get Started 

Now that you have the best practices for how to build your own deck, it’s time to dive in: You’re ready to design your deck with our 3D Deck Design tool.  

Start with either a customizable deck plan template or jump right in and begin designing your ideal deck from the ground up. 

Turn your deck dream into design

Play with shapes, colors, lighting, and railing to bring your deck ideas to life with our custom Deck Designer tool.

LAUNCH DECK DESIGNER