How To Build Deck Stairs (DIY) | Family Handyman

Time

A full day

Complexity

Intermediate

Cost

$200 and up

Introduction

Building a deck makes for a fantastic addition to any home. But it’s not going to be much use without a good set of deck stairs to get up and down from your primary backyard relaxation spot. The right set of stairs is also a key part of the design, connecting the deck with the rest of your property.

Building deck stairs might look a little intimidating to the novice DIYer, but they don’t have to be. This project will help guide you through the process, whether you’re doing it for the first time or just in need of a little refresher. Done right, your stairs and deck will last for decades. These DIY steps will also work for replacing an old set of stairs or building new ones. So grab your tools and let’s start building!

When to call a pro

Despite the fact that this article will assist you in understanding the complexities of building deck stairs, there is more to it than simply cutting deck boards and screwing them together. It is imperative that the calculations you do (and we will walk you through them) be precise and accurate, that your craftsmanship matches the same precision, and that you adhere to your local residential stair codes, which can be complicated.

Outdoor design and gardening expert Andy Wu has this advice for planning and laying out deck stairs: “Deck stairs are where form and function meet, and I’ve learned enough now to know they don’t deserve rushing through. Measure twice, folks, and break out a stair calculator so you can even the risers out. Make the stairs at least as wide as the deck for good flow through.” He offers this pro tip: “Slope the treads a bit so they drain the water—you’ll appreciate this in the future when they’re not miniature ponds.”

All this having been said, even if you are a seasoned DIYer, you shouldn’t hesitate to hire a professional to construct your deck stairs if you are unsure of your abilities or simply lack the time or resources.

FAQ

How to attach stair stringers to a deck? Stair stringers are usually attached to a deck using galvanized steel stair stringer connectors or joist hangers that are fastened to the rim joists.

How wide should deck stairs be? Building codes require stairs to be at least 36 inches wide for egress.

How many stringers for deck stairs? Stringers should not be placed more than 18-inches on center. Therefore, the narrowest staircase allowed by code (36-inches) should have three stringers. Stairs wider than that will require four or more.

Tools Required

• Chalk line
• Circular saw
• Clamps with a reach of at least 18 inches
• Drill/driver
• Framing square
• Hammer
• Handsaw
• Level
• Safety glasses
• Sawhorses
• Stair gauge

Materials Required

• 2x12 x 12 ft. (3)
• 2x6x 12 ft. (1)
• 3-in. deck screws
• Decking for risers and treads

Watch How To Build Deck Stairs: A DIY Guide to Building Deck Stairs

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