How to Convert a Single Sink to a Double Bathroom Sink

double bathroom sink
  • 5-10 hours
  • Intermediate
  • 100-500
What You'll Need
An extra matching bathroom sink
Flex lines
Faucets or taps
Dual shut-off valves
Drain pipes
Additional design elements (optional)

Not only are “his and her” sinks, or double bathroom sinks, more practical for rushed morning routines, but also they’re more stylish. With these sinks, there’s no waiting at the door to brush your teeth, or danger of mixing up facial and body products. While they’re perfect for married couples, they’re also good for families with multiple children. Read on below to see how easy it is to convert your single sink into a double bathroom sink.

Step 1 – Finding an Identical Sink

First, find either an identical single sink or buy two new basins and faucets. Mismatched double bathroom sinks will look cheap. If you can’t find an identical sink, it’s best to buy a new double-sink set.

There are many types of sinks that are available online or in stores in a variety or colors, prices and materials. Decide what color scheme and price range will suit your needs.

Step 2 – Turning off the Main Water Supply

Turn off the main water supply. If you neglect this step, your tears of frustration will be mixed with another flood. Research the type of plumbing in your residence and determine how old the pipes are in case you have to replace any damaged pipes and connections that lead into the wall.

Step 3 – Tying the Double Bathroom Sink to a Single Drain

Next, tie the double bathroom sink to a single main drain. You only need one trap. Check that the water-supply lines are attached with dual shut-off valves to prevent flooding and accidents.

Determine what size of drainpipe you need, and use tee lines on both taps to hook up individual faucets and check the water flow.

Step 4 – Choosing Correct Flex Lines, Connections, and Pipes

Finally, you must choose and install the correct pipes, connections, and flex lines. For the pipes, stainless steel is better than copper, galvanized, or non-metal piping. Flexes can be connected together if they are too short to reach the wall. Research the type of connection and pressure required to suit your double bathroom sink before visiting the shop and purchasing it.

Step 5 – Adding More Design Elements

While you don’t need to revamp the rest of the bathroom, adding matching mirrors above the new double sinks and additional soap dishes or other accessories will pull the look together.