Can You Build a Wine Cellar Under the Stairs In Your Home?

Is the Space Under Your Stairs Good for Wine?

Most homes have one awkward, sloped space under the stairs that collects vacuum cleaners and holiday boxes. Turning it into a wine cellar puts that space to real use. It’s close to the kitchen, guests can see it, and it doesn’t take over a room you already use.

But “can you” and “should you” are two different questions.

At Heritage Vine, we’ve designed and built custom cellars for about 16 years, from private homes in Scottsdale to restaurant displays in New York City. Stair cellars look simple on paper. In practice, they mix three trades that don’t usually work in the same space: fine millwork, refrigeration, and construction that has to meet code. Here’s what actually goes into one, including a few details most guides skip.

How Much Space Do You Need Under the Stairs?

Start with the tape measure, not the mood board.

A standard 750ml Bordeaux bottle needs a shelf about 13.5 inches deep, and magnums or wider Champagne bottles need up to 15 inches. Now add insulation and wall finishes, which can take several inches off each wall. So a space under the stairs that measures 36 inches deep from the outside can feel a lot tighter once it’s built out.

Our guide on how much space you need for a wine cellar gives a rough rule: about 100 bottles per 10 square feet of wall with standard floor-to-ceiling racking. A sloped ceiling lowers that number. The tall end of the space takes full-height racking, and the low end works better for bulk storage like diamond bins or case boxes tucked into the deepest corner.

Questions to answer before you design

• How many bottles do you own today, and how many will you own in ten years?
• Do you want a walk-in room or a sealed display you view through glass?
• Where will the cooling unit’s heat go?
• Is there an outlet nearby, or will you need a new dedicated circuit?

That last one sounds minor, but it isn’t.

The Code Detail Most Under-Stair Guides Miss

This part isn’t about the wine at all. Closing in the space under a staircase is a fire safety issue, because the stairs are often a main way out of a home.

The International Residential Code covers this in Section R302.7. As published in this City of Austin, Minnesota building guide, enclosed accessible space under stairs must have its walls, underside, and any soffits protected on the enclosed side with 1/2-inch gypsum board. You can read about the code itself through the International Code Council.

What does that mean for a wine cellar? In most cases, you can’t just wrap the inside of the stair structure in wood paneling or leave the foam insulation exposed. Every city and county adopts and amends the code a little differently, so your builder should confirm the exact requirements and pull permits where they’re needed.

Insulation and Vapor Barriers: Where Stair Cellars Fail

A wine cellar is a cold box inside a warm house. Warm, moist air moves toward the cold side, and when it hits a cold surface, it condenses. If that happens inside your walls, you get mold, swollen drywall, and a cooling unit that runs nonstop.

So the walls and insulation matter as much as the racking.

The U.S. Department of Energy explains how vapor retarders slow moisture moving through walls and ceilings. In a cellar, the barrier generally goes on the warm side of the insulation and needs to run without gaps. Under stairs, that means carrying it up the sloped underside of the steps and sealing around every stringer, riser joint, and hole for pipes or wires. Miss one gap and you’ve built a condensation problem, which is exactly what we cover in our article on why wine cellars sweat.

As the EPA’s guide to mold and moisture puts it, the key to mold control is moisture control. Tight, well-sealed walls do that job.

Choosing a Cooling System for a Stair Cellar

So where does the heat go?

Every cooling unit pulls heat out of the cellar and dumps it somewhere else. Under a staircase, “somewhere else” is usually a hallway, a living room, or a garage. That’s why cooling shapes the whole design. Our wine cellar climate control team generally looks at three options.

Through-the-wall units

These mount in the cellar wall and blow their exhaust into the next room. They’re the most affordable option and work for smaller cellars. The catch? Expect some noise and heat in that room, which should be well ventilated and at least twice the size of the cellar. A stair cellar next to a quiet family room isn’t always a good match.

Split systems

A split system separates the indoor cooling unit from the condenser, so the louder part can sit outside or in a utility room. For small or tightly sealed spaces like the one under your stairs, this is often the better fit, though it needs refrigerant lines run between the two parts and professional installation.

Ducted systems

Here, the unit sits in another part of the house and sends cooled air through insulated ducts, so you don’t see any equipment inside the cellar and noise stays low. It’s also the hardest of the three to install.

Whichever you pick, the target is fairly consistent. Wine Spectator notes that 45°F to 65°F is the safe range and 55°F is often cited as close to ideal, with humidity between 50 and 80 percent considered safe. It also warns that rapid, extreme, or frequent temperature swings are the real danger.

That’s the argument against a “passive” stair closet with no cooling. An interior space next to a living area will swing with the seasons, especially in hot places like Arizona. We explain this in more depth in passive vs. active wine cellars.

Racking, Glass, and Design Choices

Here’s where a stair cellar gets fun.

No two staircases are the same, so off-the-shelf racks rarely fit well. Stepped or sloped racking that follows the line of the stairs uses space a rectangular kit would waste. At Heritage Vine, we build our Heritage Series racking in our own Scottsdale workshop in oak, walnut, and sapele. That means we can shape it around the angle of your stairs instead of forcing a standard unit into the space.

A few design choices we see work well under stairs:

• A frameless glass front. It turns the space into a lit display and keeps the stair hall feeling open. Our glass wine cellars page shows how we build these enclosures.
• Label-forward rows at eye level, with bulk bins down low where the ceiling drops.
• Low-heat LED lighting, since light adds heat and UV can harm wine over time.
• Racks mounted to the wall framing, not hung off the stair stringers, so footsteps above don’t travel straight into the bottles.

If the space is shallow, a wine wall or a custom wine cabinet built in under the stairs may be a smarter move than a walk-in room. We’d rather tell you that up front.

What Does an Under-Stair Wine Cellar Cost?

Costs depend on size, materials, glass, and cooling. Based on our own pricing, wine walls and small cellars usually start around $15,000, and full custom wine rooms usually run from $30,000 to $150,000 or more. It’s hard to build a proper climate-controlled custom cellar for under $10,000.

On stair projects, the cost moves most with the cooling system and with how much work it takes to bring the space up to code. You’ll find a fuller breakdown in what it really costs to build a wine cellar, and more style ideas in our post on under-stair wine cellar design.

Why does it help to have one company handle everything? A stair cellar involves framing, insulation, electrical, glass, millwork, and refrigeration. When separate trades handle each piece, a gap in the vapor barrier or a cooling unit that’s the wrong size becomes nobody’s fault. We design, build, install, and maintain our cellars ourselves, so one team is responsible from the first drawing to the last service visit.

Ready to Turn Your Staircase Into a Wine Cellar?

If you’ve got an empty space under your stairs and a growing collection, we’d love to take a look. Our team will measure the space, talk through cooling and code requirements, and show you what’s realistic for your home and budget. Whether you’re in Arizona, California, New York, or anywhere else in the country, schedule a consultation with Heritage Vine to get started.

Frequently Asked Questions

Can you put a wine cellar under any staircase?

Not always. The space needs enough depth for racks plus insulation, somewhere to send the cooling unit’s heat, and power, so shallow or open-riser stairs may suit a wine wall or cabinet better.

How many bottles fit in a wine cellar under the stairs?

It depends on the floor space and the slope, but standard floor-to-ceiling racking holds roughly 100 bottles per 10 square feet of wall, and a sloped ceiling lowers that.

Do I need a cooling unit for an under-stair wine cellar?

For long-term storage, generally yes. Interior spaces next to living areas see seasonal temperature swings, and steady temperature is what protects wine as it ages.

Do I need a permit to build a wine cellar under the stairs?

Often, yes. New electrical circuits, refrigeration, and closing in the space under the stairs can all bring code requirements, including under-stair fire protection. Check with your local building department.

What temperature should an under-stair wine cellar be?

Around 55°F is widely considered close to ideal, with a safe range of roughly 45°F to 65°F. Avoiding rapid swings matters as much as the exact number.

Is a glass front a good idea under the stairs?

It can be. Glass turns the space into a display and keeps the hallway open. Just know it changes how much cooling the cellar needs, so the system has to be sized with the glass in mind.