Modern bathrooms demand fixtures that are both functional and refined. The Swiss Madison Voltaire 21-inch rectangle undermount bathroom sink in Matte Black delivers a clean, frameless look that integrates seamlessly beneath a vanity cabinet or custom countertop.
Built from ceramic and finished in a bold Matte Black, the Voltaire brings a contemporary edge to modern and transitional bathroom styles alike. Its undermount configuration hides the sink rim below the countertop surface, making countertop cleanup straightforward.
Why the Voltaire 21-inch Matte Black Undermount Sink
- Ceramic construction: durable, non-porous, and easy to clean in daily use
- Undermount installation eliminates exposed rims so the countertop wipes clean in one pass
- Rectangle silhouette complements modern and transitional bathroom designs
- Matte Black finish adds a bold, contemporary contrast against light countertops and cabinetry
- Sized at 21 inches to fit a wide range of vanity cabinets in that footprint range
- Yala Vanity is an authorized Swiss Madison dealer, and the sink ships free to the contiguous 48 United States
Specifications
- Brand: Swiss Madison
- Model: Voltaire
- SKU: SM-UM625MB
- Size: 21 inch
- Shape: Rectangle
- Mount Type: Undermount
- Material: Ceramic
- Finish/Color: Matte Black
- Product Type: Bathroom Sink
- Intended Use: Vanity cabinet or custom bathroom countertop installation
Frequently Asked Questions
Q: What mounting style does the Voltaire use?
A: The Voltaire is an undermount sink. It installs beneath the countertop surface so the rim is hidden, giving you a smooth countertop edge and easy wiping.
Q: What is the sink made of?
A: The Voltaire is constructed from ceramic, a non-porous material that resists staining and holds up well to daily cleaning.
Q: What is the finish, and what style bathrooms does it suit?
A: This model comes in Matte Black. Swiss Madison designed the Voltaire for modern and transitional bathroom styles.
Q: What size vanity cabinet or countertop does this sink fit?
A: The sink is sized at 21 inches. It is intended for use with a vanity cabinet or custom countertop that accommodates a 21-inch undermount basin.
Q: Is Yala Vanity an authorized dealer for Swiss Madison products?
A: Yes. Yala Vanity is an authorized Swiss Madison dealer. For questions, contact sales@yalavanity.com.
Shipping

Free Shipping on every order in the United States - no minimums, no hidden fees. We ship via USPS, UPS, FedEx, and DHL, and hand-pick the fastest carrier for your delivery zip code.
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Standard Free Shipping: 5-10 business days in transit
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Need it sooner? Expedited options (including USPS Priority Mail) are available at checkout with live rates calculated for your address
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Fully tracked & insured: Every shipment includes tracking and transit insurance at no extra cost
Order Confirmation
The moment you place your order, you'll receive a confirmation email. This means we have your order in our system and have pre-authorized your card. We immediately contact our supplier warehouse to reserve your unit for shipment. If an item is on backorder, we void the pre-authorization (no charge to you) and reach out by email with options. If it's ready to ship within 5 business days, we process the charge and release the order to our warehouse.
Order Shipment & Tracking
Orders ship within 5 business days. You'll receive a tracking number by email within 24 hours of shipment so you can follow your bathroom vanity door-to-door. If you haven't received tracking within 6 business days, email us at sales@yalavanity.com and a real human will respond the same business day.
Freight Delivery Appointment
Because bathroom vanities ship as oversized freight, our carrier partner will call you 1-2 business days before the proposed delivery date to confirm a delivery window that works for your schedule and verify your shipping address is correct. That way, you can pick a time that's actually convenient, make sure someone's home to receive the shipment, and avoid missed-delivery fees. Please double-check that the phone number on your order is the best way to reach you - that's how the carrier will get in touch.
Damage-Free Delivery Promise
All Yala Vanity shipments are fully insured. Please inspect the packaging the moment your vanity arrives and note any visible damage when signing for delivery. If anything shows up damaged, snap a photo and email sales@yalavanity.com - we'll file the carrier claim for you and make it right. You focus on the bathroom remodel; we'll handle the logistics.
Easy Cancellations & Refunds
Change of plans? Cancel within 48 hours of ordering for a full refund - no questions asked. Cancellations after 48 hours are subject to a $20 administration fee, and if the order has already shipped, return shipping is the buyer's responsibility. Refunds are issued back to your original payment method, usually within 3-5 business days of approval.
Price Match Guarantee
100% Price Match Guarantee - for a full 6 months after your purchase. Find the same bathroom vanity at a lower advertised price on another authorized online retailer-or even on our own site-within 6 months of your order date, and we'll refund the difference. No 30-day cutoffs, no hoops. Just confidence that you locked in the best price on yalavanity.com.
How to Claim Your Price Match
- Email sales@yalavanity.com with a link to the lower-priced listing
- We verify eligibility (typically within 1 business day)
- Your partial refund is issued back to your original payment method
Price Match Eligibility
Our 100% Price Match Guarantee applies when:
- You purchased the item from yalavanity.com before submitting the claim
- The competitor is an Authorized Retailer of the product
- The competitor operates as an online store (no physical retail location)
- The competing item is in stock on the competitor's website at the time of the claim
- The match covers the item price and shipping charges (sales tax excluded)
Not eligible: promotional pricing such as rebates and buy-one-get-one offers; discount, liquidation, or auction websites (e.g., eBay, Overstock); and any retailer that isn't an authorized seller of the product.