Transform Your Bathroom: Installing a Second Sink Step-by-Step

Transform Your Bathroom Installing a Second Sink Step-by-Step


If you’re tired of waiting your turn to use the bathroom sink in the morning or want to upgrade your bathroom’s functionality and style, installing a second sink can be a great solution. In this step-by-step guide, we’ll walk you through the process of adding a second sink to your bathroom. With some basic tools and a little DIY spirit, you can transform your bathroom and make those busy mornings a breeze.


Before you start tearing apart your bathroom, careful planning is essential. Consider the following:

Location: Decide where you want to install the second sink. It’s usually placed next to the existing one for easy access to plumbing.


Assess your bathroom’s existing plumbing to ensure it can support another sink. You may need to make adjustments.

Style and Size: Choose a sink that complements your bathroom’s style and fits the available space. You can opt for a pedestal sink, wall-mounted sink, or a vanity with two sinks.

Budget: Determine your budget for the project. Second sinks can range from affordable to luxurious.

Permits: Check local building codes and permits required for plumbing work.

Gather Your Tools and Materials

You’ll need the following tools and materials for this project:

  • New sink and faucet
  • PVC pipe and fittings
  • Wrench
  • Screwdriver
  • Pipe cutter
  • Plumber’s tape
  • Plumber’s putty
  • Measuring tape
  • Pencil
  • Hacksaw
  • Adjustable wrench
  • Level
  • Silicone caulk
  • P-trap

Turn Off the Water Supply

Before starting any plumbing project, it’s crucial to turn off the water supply to your bathroom. Locate the shut-off valve and close it to prevent any water flow. This step is essential for your safety and to avoid water damage during installation.

Remove the Existing Vanity or Cabinet

If you’re installing a sink on a new countertop, skip this step. However, if you’re adding a sink to an existing vanity or cabinet, you’ll need to remove the countertop to make space for the new sink. Use a wrench and screwdriver to detach the countertop from the cabinet or vanity.

Mark the Sink Location

Using your measuring tape and a pencil, mark the exact location where you want to install the second . Make sure it’s level with the existing sink to maintain a symmetrical appearance.

Cut the Hole for the Sink

Use a hole saw or jigsaw to cut the hole for the . Make sure to follow the manufacturer’s instructions for the correct size and placement of the hole. Wear safety goggles to protect your eyes while cutting.

Install the New Sink

Place the new into the hole and secure it in place according to the manufacturer’s instructions. If it’s a wall-mounted use appropriate brackets and anchors to secure it to the wall. If it’s a vanity with a sink, follow the installation instructions provided with the product.

Connect the Drain

Connect the drain for the new sink to the existing plumbing. You’ll need to cut and fit PVC pipe and fittings to create the appropriate connections. Use plumber’s tape and putty to ensure a watertight seal. Make sure to follow the correct slope for the drain to prevent water buildup.

Install the Faucet

Install the faucet on the new according to the manufacturer’s instructions. Make sure it’s properly aligned and securely attached. Connect the water supply lines to the faucet and tighten them with a wrench.

Test the Plumbing

Before completing the installation, turn the water supply back on and test the plumbing. Check for any leaks, and make any necessary adjustments. Ensure that the water flows smoothly and there are no issues with drainage.

Seal Around the Sink

Use silicone caulk to seal around the edges of the where it meets the countertop or wall. This not only creates a watertight seal but also gives your bathroom a finished look.

Reattach the Countertop or Vanity

If you removed the countertop or vanity in step 4, reattach it to the cabinet or vanity base. Make sure it’s securely fastened and level.

Final Touches

With the installed and the plumbing tested, it’s time for the final touches. Clean up any mess, and ensure that all the components are in good working condition. Add any decorative elements, such as a mirror or backsplash, to complete the transformation of your bathroom.


Adding a second sink to your bathroom can make your daily routine more efficient and add a touch of luxury to your space. By following these step-by-step instructions and taking your time with the installation, you can achieve a professional-looking result without the need for expensive professional help. Transform your bathroom, and enjoy the convenience and style of having a second sink at your disposal.