How to Add a Double Sink: Step-by-Step Guide

Upgrading Your Bathroom: A Step-by-Step Guide to Adding a Double Sink

Installing a double sink in your bathroom can significantly enhance its functionality and aesthetic appeal. This upgrade is particularly beneficial for master bathrooms or shared bathrooms, as it allows for two people to use the sink area simultaneously. Here's a comprehensive, step-by-step guide to help you achieve this transformation.

Planning and Preparation

Before you start any work, it's crucial to plan and prepare thoroughly. This includes measuring your space, choosing the right vanity or sink, and gathering all necessary tools and materials.

Measure Your Space

Accurate measurements are vital to ensure your new double sink fits perfectly. Measure the width, depth, and height of your current vanity or countertop. Also, consider the plumbing configuration and ensure it can accommodate two sinks.

How To Install A Double Sink In The Bathroom at Loretta Thompson blog

Choose Your Double Sink

There are two main types of double sinks: undermount and drop-in. Undermount sinks are installed underneath the countertop, creating a seamless look, while drop-in sinks sit on top of the counter. Consider your bathroom's style, your budget, and your plumbing configuration when making your choice.

Gather Tools and Materials

  • Tape measure
  • Circular saw or jigsaw
  • Drill and drill bits
  • Screwdriver
  • Level
  • Pencil
  • New sink and faucets
  • Caulk or silicone sealant
  • Plumber's putty
  • Towel bar or hardware for sink support (if needed)

Removing the Old Sink

Before you can install your new double sink, you'll need to remove the old one. Start by turning off the water supply and disconnecting the drain pipes. Then, carefully remove the sink and any remaining hardware.

Installing the New Sink

Now that your space is prepared, it's time to install your new double sink. The process will vary slightly depending on whether you've chosen an undermount or drop-in sink.

Double Sink Bathroom Vanities: Pros, Cons, Ideas - Pelican Cabinets ...

Undermount Sink Installation

If you're installing an undermount sink, you'll need to cut a hole in your countertop. Use your measurements to mark the hole's location, then carefully cut along the lines using a circular saw or jigsaw. Once the hole is cut, place the sink in position and mark where the screws will go. Drill pilot holes, then secure the sink using screws or clips provided by the manufacturer. Finally, apply caulk or silicone sealant around the edge of the sink to create a watertight seal.

Drop-In Sink Installation

Installing a drop-in sink is typically simpler than undermount sinks. Place the sink in the hole or on the countertop, ensuring it's level. Apply plumber's putty around the rim of the sink, then press it firmly into place. Secure the sink using screws or clips, then apply caulk or silicone sealant around the edge to create a watertight seal.

Installing the Faucets and Final Touches

Once your sink is securely in place, it's time to install the faucets. Connect the faucets to the water supply lines, ensuring they're tight and secure. Then, connect the drain pipes and turn the water supply back on. Finally, test your new double sink to ensure everything is working correctly.

Conclusion

Adding a double sink to your bathroom can significantly improve its functionality and style. By following this comprehensive guide, you can achieve this upgrade with confidence. Always remember to prioritize safety and accuracy throughout the process, and don't hesitate to consult a professional if you're unsure about any aspect of the installation.

Reference

How to Make a Double Sink in Your Home | Bathroom Remodel DIY

30.10.2021 ... Do you want to turn your single sink into a double vanity? I can show you how! In this video, I'm opening my wall, teeing off my plumbing ...

How To Install A Double Sink In The Bathroom at Loretta Thompson blog

How To Install A Double Sink In The Bathroom at Loretta Thompson blog

Visual inspiration for your project.

Reference

Installing a double sink vanity where a single sink once was. I'm ...

27.05.2023 ... ... sink. At the end of each pipe, install a shark bite (cpvc to half turn or quarter then valve with 3/8 thread for the braided water line ).

Double Sink Bathroom Vanities: Pros, Cons, Ideas - Pelican Cabinets ...

Double Sink Bathroom Vanities: Pros, Cons, Ideas - Pelican Cabinets ...

Visual inspiration for your project.

Reference

How to Add a Second Sink to a Bath Vanity | This Old House

25.09.2014 ... This Old House plumbing and heating expert Richard Trethewey shows how to install a new sink into an existing vanity.

How To Add A Double Sink In Bathroom

How To Add A Double Sink In Bathroom

Visual inspiration for your project.

Reference

How to Upgrade Bathroom Vanity | Can You Add a Second Sink?

30.07.2025 ... Remove the old vanity and disconnect plumbing · Measure and install a new double-sink vanity · Adjust plumbing lines for two sinks · Install new ...

A visual guide to plumbing a double sink vanity

A visual guide to plumbing a double sink vanity

Visual inspiration for your project.

Reference

Adding a Double-Sink Vanity To Your Bathroom - This Old House

Hooking Up a Second Bathroom Sink · Shut off the water supply and install new T-fittings to run supply lines to the new sink. · Adapt the existing drain by ...

15 Double Sink Bathroom Vanity Ideas to Maximize Style and Functionality

15 Double Sink Bathroom Vanity Ideas to Maximize Style and Functionality

Visual inspiration for your project.

Reference

Double sinks – ideal for multi-person households - Duravit

The biggest difference to the first variant is the ceramic. Here, there is a large, continuous basin. The two sink faucets remain. You are also welcome to add a ...

How we easily converted a single sink to a double sink - YouTube

How we easily converted a single sink to a double sink - YouTube

Visual inspiration for your project.

Reference

How to Plumb Two Sinks for One Drain - YouTube

27.03.2024 ... Today we are plumbing two sinks for one drain. You may want to install two sinks instead of one when retrofitting a bathroom.

Dual Bathroom Sink Plumbing Diagram – Bathroom Guide by Jetstwit

Dual Bathroom Sink Plumbing Diagram – Bathroom Guide by Jetstwit

Visual inspiration for your project.

Reference

How to add double sinks to a vanity cabinet in Chief Architect?

13.09.2024 ... You can just drop the sink into the Floorplan and move it into the cabinet, then adjust your centerline so it's centered over each set of doors.

Double Vanity Bathroom Plans: Maximize Space & Style

Double Vanity Bathroom Plans: Maximize Space & Style

Visual inspiration for your project.

Reference

Want To Add a Double Sink Vanity? Here's What You Need To Know

27.02.2021 ... Double sink vanities are trending. We'll walk you through how to add a double sink vanity to enhance your bathroom and up your home's resale ...

9 Inspiring Double Vanity Bathroom Ideas | Hazley Builders

9 Inspiring Double Vanity Bathroom Ideas | Hazley Builders

Visual inspiration for your project.

Reference

How Double Sink Plumbing Is Different—and How to Install It

16.12.2022 ... Instructions · Install Sink Strainers · Put the Sink in Place · Measure the Drain Outlet Height · Connect the Drain Tailpieces · Add in the ...

Double Sink Bathroom Plumbing

Double Sink Bathroom Plumbing

Visual inspiration for your project.

Reference

How To Plan The Layout For A Bathroom Vanity With Double Sink

01.02.2026 ... With separate sinks, each person can move through their routine without constantly adjusting around the other. This setup works especially well ...

How to Install Bathroom Sink Plumbing: Set-up Your Own Bathroom Sink ...

How to Install Bathroom Sink Plumbing: Set-up Your Own Bathroom Sink ...

Visual inspiration for your project.

Reference

converting one sink to a double vanity if you're curious ... - Instagram

09.01.2025 ... adding a second sink isn't as hard as it might sound, every sink needs… drain - to carry away water vent - balances pressure to make water ...

Two Bowl Sinks Kitchen – Things In The Kitchen

Two Bowl Sinks Kitchen – Things In The Kitchen

Visual inspiration for your project.

Reference

The Double Sink Vanity: 6 Bathrooms Get 2X Space, Style - Sweeten

19.07.2022 ... Double-sink vanities also offer extra storage space, with options like additional drawers and cabinets. The positive upgrades add up to an ...

How to Install Dishwasher Drain to Double Sink | 10 Easy Steps

How to Install Dishwasher Drain to Double Sink | 10 Easy Steps

Visual inspiration for your project.

Reference

9 Ideas for the Space Between Double Sinks in the Bathroom - Houzz

Clean and minimal vanity door panels create a modern look, and vanity legs introduce a more spacious, floating feel. The roomy drawers and cabinets are designed ...

Diagram Double Sink Vanity

Diagram Double Sink Vanity

Visual inspiration for your project.

Reference

Double Kitchen Sink Installation Part 1 - YouTube

15.09.2014 ... Double Kitchen Sink Installation Part 1. 20K views · 11 years ago ... How To Install Kitchen Sink Drain Strainer, Stop Leaks. jeffostroff ...

Double Bathroom Sink Plumbing Diagram

Double Bathroom Sink Plumbing Diagram

Visual inspiration for your project.

Reference

Ideas for bathrooms with two sinks - Cosentino

Another choice could be to install two sinks ... Choose a bathroom with two sinks, whether with separate cabinets, one double sink fixture, or any other ...

The Advantages of a Double Bowl Sink: Why It's a Great Addition to Your ...

The Advantages of a Double Bowl Sink: Why It's a Great Addition to Your ...

Visual inspiration for your project.

Reference

Single vs Double Sink Vanity: The 5-Minute Decision Guide

Building codes require minimum 38 centimetres (15 inches) from toilet centre to any fixture. A too-wide vanity in a small bathroom might create uncomfortably ...

How To Plumb A Double Vanity Sink | Gas Furnace

How To Plumb A Double Vanity Sink | Gas Furnace

Visual inspiration for your project.

Reference

Easy Step by Step Guide to Convert Single Drain Pipe ... - YouTube

04.08.2022 ... Are you wanting to install a double sink, but only have a single 1 1/4 inch drain pipe coming out of the wall? You could rip the drywall ...

Double sink plumbing correct? : r/Plumbing

Double sink plumbing correct? : r/Plumbing

Visual inspiration for your project.

Reference

Replumb single to double bathroom sinks - Plbg.com

I'm redoing a hallway bathroom and I want to convert the old 60" single sink vanity to a new 60" double sink vanity. ... I use a double fixture fitting and put ...

8 Essential Double Sink Drain Diagram Ideas for Beginners – Moo Wiring

8 Essential Double Sink Drain Diagram Ideas for Beginners – Moo Wiring

Visual inspiration for your project.

Reference

Double Sink Bathroom Remodel: Should You Add One?

07.07.2025 ... Considering a double sink bathroom remodel? Learn the benefits, drawbacks, and design factors to decide if a double vanity is the right ...

How to Install Dual Kitchen Sink Drain Plumbing Pipes - YouTube

How to Install Dual Kitchen Sink Drain Plumbing Pipes - YouTube

Visual inspiration for your project.