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Case Study:

Residential Double-Sink Vanity Plumbing Installation In Williamsville, NY

– Buffalo, NY

New PVC drain lines and Uponor PEX water supply lines roughed in for sink configuration in Williamsville, NY bathroom.
New PVC drain lines and Uponor PEX water supply lines roughed in for double-sink configuration in Williamsville, NY bathroom.
bathroom plumbing installation by Cellino in Williamsville, NY.
Subfloor and wall opened to access existing drain and water piping for double-sink rough-in by Cellino in Williamsville, NY.
Single-sink bathroom before double-sink vanity plumbing upgrade by Cellino Plumbing in Williamsville, NY.

Location:

Buffalo, NY

Property Type:

Single-Family Home

Project Type:

Double-Sink Vanity Plumbing, PEX & PVC Rough-In, Faucet & Fixture Installation

Client Type:

Residential Homeowner
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Overview

Cellino Plumbing, Heating, Cooling & Electric was called to a single-family home in Williamsville, NY, to upgrade a single-sink bathroom to a double-sink configuration. The homeowner had already selected a new vanity and fixtures and needed a licensed plumber to handle the full rough-in, installation, and testing.

 

  • Opened the subfloor and wall to access the existing drain and water piping for the bathroom sink.
  • Reworked the plumbing system to support a double-sink setup, routing separate drain and water lines to each sink location through the floor and wall.
  • Used PVC piping and fittings along with copper and Uponor PEX materials to properly rough in the new configuration.
  • Installed the customer-supplied vanity by modifying the base to accommodate existing plumbing, setting it in place, leveling it, and fastening it securely to the wall.
  • Installed the sink top, sealed it, and connected two customer-supplied widespread faucets with new pop-up assemblies.
  • Reconfigured all drain and water lines beneath the vanity to support the double-sink setup.
  • Installed the bathroom light fixture and two mirrors to complete the space.
  • Tested both sinks thoroughly upon completion to confirm proper operation.
bathroom plumbing installation by Cellino in Williamsville, NY.
Subfloor and wall opened to access existing drain and water piping for double-sink rough-in by Cellino in Williamsville, NY.

Key Challenges

Upgrading a single-sink bathroom to a double-sink configuration in an existing home required careful planning and precise execution at every stage:

 

  • Existing Plumbing Access: Accessing the existing drain and water piping required opening both the subfloor and the wall. This is a precise process to avoid damage to surrounding finishes while gaining the access needed to rework the system.
  • Routing New Lines in Finished Space: Separate drain and water lines had to be routed to two sink locations through the floor and walls of an already finished bathroom, requiring careful planning to minimize disruption and maintain a clean result.  
  • Vanity Base Modification: The customer-supplied vanity base required modification to fit around the existing plumbing configuration before it could be set, leveled, and secured. This is a common challenge when homeowners supply their own fixtures. 

 

Double-Sink Drain & Water Configuration: Reconfiguring the drain and supply lines beneath the vanity to serve two sinks independently required precise connections and fittings to ensure leak-free, code-compliant operation at both sink locations.

New PVC drain lines and Uponor PEX water supply lines roughed in for sink configuration in Williamsville, NY bathroom.
Single-sink bathroom before double-sink vanity plumbing upgrade by Cellino Plumbing in Williamsville, NY.

Our Approach

Cellino resolved each challenge with a phased, non-invasive installation strategy:

 

  • Subfloor & Wall Access: Our plumber opened the subfloor and wall with precision to expose the existing drain and water piping, minimizing disruption to finished surfaces throughout the process.
  • PVC & PEX Rough-In: New drain lines were roughed in using PVC piping and fittings, while copper and Uponor PEX materials were used for the water supply lines. The approach is a combination chosen for durability, flexibility, and compatibility with the existing system. 
  • Vanity Modification & Setting: The customer-supplied vanity base was modified on-site to clear the existing plumbing, then set in place, leveled, and fastened securely to the wall before any finish work began. 
  • Complete Finish Installation: The sinktop was installed and sealed; both widespread faucets and pop-up assemblies were connected; and the light fixture and two mirrors were installed to deliver a fully finished bathroom space. 

result

The completed project delivered a fully functional, professionally finished double-sink bathroom for a residential homeowner in Williamsville, NY. Every element, from the rough-in plumbing to the final fixtures, was completed in a single visit with no callbacks required.

 

Both sinks are fully operational with properly configured drains and water lines serving each sink independently. The customer-supplied vanity is set, leveled, sealed, and securely fastened, with the base modified to fit cleanly around the existing plumbing. Two widespread faucets and pop-up assemblies are installed and functioning correctly at both sink locations.

 

The bathroom light fixture and two mirrors complete the space, leaving the homeowner with a finished room ready for daily use. All rough-in and finish plumbing was completed using PVC, copper, and Uponor PEX materials in full compliance with applicable codes.

Upgrade Your Bathroom Plumbing in Williamsville, NY

This project reflects what Cellino delivers on every residential plumbing job: a solution planned around the home’s existing conditions, executed cleanly in a single visit, and finished to a standard the homeowner can see and rely on every day. From subfloor access to the final mirror installation, every step was handled by a licensed plumber with the materials and expertise to do it right.

 

Cellino Plumbing, Heating, Cooling & Electric provides comprehensive residential plumbing services throughout Williamsville and Western New York. Our licensed plumbers deliver reliable, code-compliant results tailored to your home, whether it’s bathroom reconfigurations, vanity installations, or full repiping and water treatment. 

 

If you’re planning a bathroom upgrade or dealing with aging plumbing that needs rework, Cellino is ready to assess your needs and develop a plan around them. We bring licensed expertise, quality materials, transparent pricing, and flexible financing options to every job, regardless of size or complexity.

 

Ready to upgrade your bathroom? Call Cellino at (716) 302-4488 or schedule service online today.

Frequently Asked Questions

In most cases, yes. A licensed plumber will assess the existing drain and water piping to determine the best approach for routing new lines to a second sink location. Access through the subfloor or wall is typically required.

Cellino uses PVC piping and fittings for drain lines and copper or Uponor PEX tubing for water supply lines.

Yes. Cellino installs customer-supplied vanities and fixtures. Our plumbers will modify the vanity base as needed to fit around existing plumbing, set and level it, and complete all connections for a professional finish.

A full double-sink vanity installation, including plumbing rough-in, vanity setting, faucet installation, and fixture installation, is typically completed in a single visit for most residential bathrooms.

A pop-up assembly is the drain stopper mechanism in a bathroom sink controlled by a rod behind the faucet. New faucets typically include matching pop-up assemblies, and installing them together ensures proper fit, function, and a clean, finished appearance.

Yes. Cellino offers flexible financing options to help homeowners manage the cost of bathroom upgrades and plumbing improvements.
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