If you’re planning a wood stair project, one of the first questions that comes up is: Do I need stair risers? It’s a surprisingly common debate, and the answer isn’t always cut and dry. Whether you’re going for a sleek, modern look with open riser stairs or a more traditional closed staircase, the choice affects everything from safety and building code compliance to the overall aesthetic of your home.

Below, we’ll walk you through everything you need to know about stair risers, what they are, when they’re required, and how they can transform the look and feel of your staircase.

What Are Stair Risers?

A stair riser is the vertical board that fills the space between each stair tread (the horizontal surface you step on). Together, treads and risers form the complete step unit. Risers close off the back of each step, giving a staircase its solid, finished appearance.

When risers are left out entirely, the result is what’s known as open riser stairs, a popular design choice in contemporary homes where you can see through the steps. Both styles have their place, but understanding the trade-offs is key before making your decision.

Closed vs. Open Riser Stairs: What’s the Difference?

The choice between closed vs. open riser stairs comes down to aesthetics, safety, and how your staircase will be used day to day.

Closed Riser Stairs

Closed riser stairs have a vertical board filling every gap between treads. This is the traditional, classic staircase style. The benefits include:

• A clean, finished look that suits most home styles

• Added structural support for the treads

• Improved safety, particularly for young children and pets

• Better sound dampening as you walk up and down

• Easier to meet residential building code requirements

Open Riser Stairs

Open riser stairs leave the vertical space between treads exposed. This style is popular in modern, minimalist, and industrial-inspired interiors. The benefits include:

• A light, airy appearance that suits contemporary design

• The illusion of more space, especially in smaller or darker areas

• A dramatic visual effect, particularly with floating stair designs

• Easy to clean underneath the staircase

However, open riser stairs come with real considerations around stair safety, especially in homes with young children or older adults. Building codes in many areas require that open risers not allow a 4-inch sphere to pass through the gap, which places limits on how open your design can be.

Do I Need Stair Risers? What Building Codes Say

In most residential applications governed by the International Residential Code (IRC), stair risers are technically not required to be solid, but there are strict rules about the size of any opening. Specifically, the IRC states that open risers must not allow the passage of a 4-inch diameter sphere. This effectively limits how open your stairs can be and may require some form of partial riser or decorative infill.

Before deciding to go with open riser stairs, it’s important to:

1. Check your local building codes or consult with a licensed contractor

2. Consider who will be using the stairs regularly

3. Think about long-term resale value and home inspection requirements

When in doubt, opting for closed risers is the safer and more universally compliant choice.

How White Risers Can Transform Your Staircase

One of the most popular and timeless choices for finishing a staircase is white stair risers paired with natural wood treads. This classic contrast creates a crisp, polished look that suits everything from farmhouse and colonial styles to transitional and Craftsman interiors.

White risers serve as a visual anchor, drawing the eye upward while letting the beauty of the wood tread take center stage. The result is a staircase that feels intentional and designed, not like an afterthought.

At Wood Stair Co., our white risers are crafted to pair seamlessly with our hardwood stair treads. They’re pre-primed and ready for painting, making installation and finishing quick and straightforward.

What Are Retro Risers?

Retro risers are a smart solution for homeowners who already have carpeted or finished stairs and want to upgrade to a clean, wood-tread look without tearing everything down to the subfloor. They’re designed to fit over the existing riser surface, offering a fresh, updated appearance with less labor and disruption.

They’re an especially practical choice when:

• You’re doing a stair remodel rather than new construction

• The existing risers are structurally sound but cosmetically worn

• You want to minimize the scope of your renovation project

Retro risers are available in our stair treads and risers collection and can be ordered to match a wide range of tread widths and heights.

Tips for Finishing Stair Risers

Whether you’re installing new risers or refreshing existing ones, finishing stair risers properly makes a huge difference in how your staircase looks and holds up over time.

1. Prime Before You Paint

If you’re using white or painted risers, always apply a quality primer before your finish coat. This ensures better adhesion, an even color, and improved durability in a high-traffic area.

2. Use the Right Paint Sheen

For risers, a semi-gloss or satin finish is ideal. It’s easier to clean than flat paint and holds up better to scuffs, shoes, and general wear.

3. Caulk the Gaps

After installation, caulk the seam where the riser meets the tread and the wall stringer. This gives a seamless, professional finish and prevents dust and debris from collecting in the gaps.

4. Consider a Durable Top Coat on Wood Risers

If you’re leaving your risers natural wood rather than painting them, apply a polyurethane or hardwax oil top coat to protect the surface from foot traffic and scratches.

5. Work From the Top Down

Always finish and install your stair risers starting from the top of the staircase and working down. This prevents you from stepping on fresh finishes as you work.

Can I Add Risers Later if My Stairs Are Already Built?

Yes — and it’s more common than you might think. Homeowners often start with open riser stairs only to find they want a more finished look, or realize that young children or pets make an open riser unsafe.

Retrofitting risers onto an existing staircase is a manageable project, though the ease of installation depends on how your original treads were constructed. In most cases, a riser board can be cut to fit and secured to the back of each tread using construction adhesive and finish nails. Retro risers are specifically designed for this kind of retrofit application.

If you’re unsure about the fit or your stair dimensions, browse our full stair treads and risers collection or contact the Wood Stair Co. team. We’re happy to help you find the right product for your project.

Ready to Shop Stair Risers?

Whether you’re building a new staircase from scratch or refreshing an existing one, Wood Stair Co. has everything you need. Browse our selection of white risers and our full range of stair treads and risers to find the perfect match for your project.

Have questions? Our team is here to help you build a staircase that’s safe, beautiful, and built to last.