Laundry Room Sinks: Installation Guide

how to add a sink to laundry room

Adding a sink to your laundry room can be a great way to make the space more functional and efficient. However, it requires plumbing knowledge and can be tricky. Before you start, you need to decide where to put the sink, ensuring it's easily accessible and that you have enough space. You should also consider how much countertop area you want around your new sink.

If you plan to install a sink with its faucet and drain, you will need to submit plans to your local building department, as adding a sink to an existing laundry room will likely require an electrical permit. While some states have specific codes regarding the sink's location in relation to other laundry room features, most do not have any placement requirements.

The process of installing a sink involves cutting into the existing water supply and drain lines, connecting new pipes, and assembling the sink's plumbing. It is important to shut off the water supply before beginning any work and to follow local codes and regulations throughout the installation process.

Characteristics Values
Working Time 5-6 hours
Total Time 6-8 hours
Skill Level Advanced
Estimated Cost $80 to $150
Space Ensure there is enough room for a sink and other appliances
Countertop Area Decide how much countertop area you want around your new sink
Plumbing Understand plumbing and have some experience
Codes and Regulations Check local codes and regulations
Rerouting Pipes Check if you need to reroute existing pipes
Water Supply Ensure access to a water supply
Drainage Ensure proper drainage is accessible
Location Pick a location that is easily accessible and close to the washer and dryer
Installation Follow manufacturer instructions for mounting brackets, faucets, and drains
Electrical Consult an electrician for wiring, especially if working with an existing electrical system

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Check local codes and regulations

Adding a sink to your laundry room is a great way to make the space more functional, but it's important to ensure that you comply with local codes and regulations. Here are some things to keep in mind:

First, check with your local permitting agency or building department for information about codes and permits for laundry room sink installation. Most jurisdictions will require a permit, and some may even mandate a licensed plumber for the job. Submit detailed plans of your project, including the sink's placement and the available floor space for installation. If your sink has a unique faucet and drain setup, you will need to include those specifics in your plans as well.

Second, understand the plumbing codes and regulations that apply to your project. The National Uniform Plumbing Code applies to the entire country, but local codes can be more stringent. Request information about these local plumbing codes from your local building department. Some common plumbing code considerations include:

  • Proper venting of drain pipes to prevent sluggish drainage and the release of noxious fumes.
  • Correct pipe sizing and materials for drains, vents, and supply lines.
  • Ensuring adequate water pressure with appropriate valves.
  • Maintaining the structural integrity of the house during installation.
  • Correctly sloping drain pipes to facilitate proper drainage.
  • Using primer when joining PVC pipes to prevent leaks.
  • Installing access panels to provide future access to valves, controls, cleanouts, and fittings.
  • Using the correct transition fittings when changing pipe materials.
  • Replacing old gate valves to address low water pressure issues.
  • Installing water hammer arresters to reduce pipe vibrations and clanging.
  • Using approved clamps or straps to secure pipes at specified intervals.

Third, be mindful of any state-specific plumbing codes. Only 35 states have adopted the International Plumbing Code (IPC). The remaining states have generally adopted all or part of the Uniform Plumbing Code (UPC) or have their own variations. For example, some states mandate the use of an air gap fitting for dishwasher drain hoses, while others allow alternative methods to prevent backflow.

Finally, consider consulting with a licensed plumber or an architect/engineer specializing in plumbing to ensure your project complies with local codes and regulations. Plumbing work can be complex, and seeking professional advice can help you avoid costly mistakes and ensure a safe and functional laundry room sink installation.

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Choose a sink location

When choosing a location for your laundry room sink, there are several factors to consider. Firstly, you need to ensure that you have enough space in your laundry room for a sink. If you are working with an existing layout and don't want to make significant changes, a freestanding or wall-mounted sink is a good option as they don't require additional cabinetry. Freestanding sinks come with their own basin and legs and can be easily hooked up to the existing water supply. Wall-mounted sinks, on the other hand, are ideal if you want to maximise floor space.

If you are undertaking a renovation or have the flexibility to change the layout, you have more options. You can choose a sink that comes with a base cabinet, similar to a bathroom vanity, or opt for an undermount design, which can be installed in a run of cabinetry or "dropped in" to a countertop for a modern, seamless look. These options provide valuable counter space, which is useful if you plan to use the sink frequently and need a nearby spot to scrub and dry items.

Another important consideration when choosing a sink location is the proximity to a water supply and proper drainage. The sink should be placed close to a work area, preferably near the washer, which is a source of hot and cold water and a drain point. This will involve some plumbing work, so it is essential to consult a professional if you are unfamiliar with the necessary steps and skills.

Lastly, think about the size of the sink and how you plan to use it. If you have a large family or need to wash bulky items, a larger sink with a double basin might be ideal. On the other hand, if you have limited space or will only use the sink occasionally, a small bar sink may be a more suitable choice.

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Prepare the space for installation

Preparing the space for installation is a crucial step in adding a sink to your laundry room. Here is a step-by-step guide to help you through the process:

Step 1: Choose the Right Location

Select a spot in your laundry room that is easily accessible and ensures the sink is within reach of the necessary plumbing. Consider the amount of space you have and whether there is enough room for a comfortable fit. If your laundry room is crowded with appliances and storage, you may need to rearrange items or consider relocating your laundry area to a larger space.

Step 2: Check for Existing Pipes

Before finalising the location, it is essential to check for existing pipes to avoid any accidental damage during installation or future use. Ensure that there are no pipes running through the area where you plan to place the sink.

Step 3: Understand Codes and Regulations

Adding a sink to your laundry room may require you to obtain an electrical permit from your local building department. Familiarise yourself with the specific codes and regulations in your area, as they may dictate where you can place your sink in relation to other laundry room features. Submit detailed plans to the relevant authorities, outlining the sink's placement and the available floor space.

Step 4: Reroute Existing Pipes

If your walls are already up and the plumbing rough-in is complete, you will need to reroute the pipes. Start by shutting off your home's water supply and draining the pipes. Cut away the pipe sections between the new sink location and the existing pipes, keeping these sections as long as possible to minimise the need for new pipes.

Step 5: Cut Through Floor Joists

Use a pipe cutter or chisel to cut through any floor joists that may obstruct your new plumbing layout. This step ensures a clear path for routing new lines under the existing pipes.

Step 6: Choose the Right Fittings

When attaching drains or faucets to new fixtures, opt for compression fittings instead of threaded ones. Compression fittings are easier to install and reduce the risk of leaks during installation.

Step 7: Drill Holes

Follow the manufacturer's instructions to drill holes in countertops and walls for mounting brackets, faucets, and drains. If you are working with an existing electrical system, you may need to call an electrician to assist with wiring.

Step 8: Check Building Codes for Undermount Sinks

If you plan to install an undermount sink, consult your local building codes first. There may be restrictions on the distance from the wall for such installations. Additionally, ensure that your walls can support the weight of an undermount sink.

By carefully following these steps, you will effectively prepare the space for installing a sink in your laundry room.

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Install the sink

The process of installing a sink in your laundry room is fairly straightforward, but it requires careful planning and preparation. Here are the steps you need to take:

  • Pick the location for your sink: Choose a spot that is easily accessible and close to the washer and dryer. Make sure there is enough space for the sink, as well as any additional countertop area you may want. Consider any other appliances that will be installed nearby to ensure adequate clearance.
  • Measure the space: Ensure that the sink will fit comfortably in the selected location. Take into account the size of the sink, as well as any additional plumbing fixtures such as faucets and drain pipes.
  • Prepare the space for installation: Follow the manufacturer's instructions to drill holes in countertops and walls for mounting brackets, faucets, and drains. If you are working with an existing electrical system, you may need to call an electrician to assist with wiring. Additionally, check local building codes for any restrictions or requirements, especially if you plan to install an undermount sink.
  • Connect the drain and vent pipes: Turn off the water supply valve to shut off the water supply to the building. Locate the room's drain pipe and vent pipe. Use a hacksaw to cut through the drain pipe, and if there is a vent pipe, cut through it as well. You will need to install a wye or tee fitting to connect the sink's drain to the existing plumbing. The type of fitting used will depend on the orientation of the pipes (vertical or horizontal) and local plumbing codes.
  • Set up the water supply lines: Locate the water supply lines (usually copper pipes) and use a hacksaw to cut through them. Clean the pipe ends and coat them with flux. Install copper tee fittings on the pipes, pointing towards the location of the sink. Solder the pipes together using a propane torch and lead-free metal solder.
  • Secure the pipes to the wall: Drill holes in the wall and screw in copper wall anchors to support and secure the water supply pipes.
  • Install the sink: Place the sink in the desired location, ensuring it is level. If the sink has adjustable legs, adjust them as needed to level the basin.
  • Install the drain strainer and P-trap: Apply plumber's putty to the underside of the drain strainer and secure it in the sink's drain hole. Tighten the strainer's nut with pliers. Connect the sink's tailpiece to the P-trap using a nut and threaded flange.
  • Connect the P-trap to the drain pipe: Use a short length of PVC pipe (approximately 2.5 inches) to connect the P-trap to the drain pipe. You may need additional fittings to extend the connection. Secure the joints with plastic compression nuts tightened with pliers.
  • Install the faucet: Apply plumber's putty to the base of the faucet and secure it in the sink's faucet hole. Tighten the faucet from below the sink using the provided nuts.
  • Connect the faucet to the water supply: Use flexible, braided, stainless steel supply tubes to connect the faucet to the tee fittings on the copper supply pipes. Tighten the connections with pliers.
  • Turn on the water supply: Once all connections are secure, turn on the water supply valve to restore water flow to the sink. Test the hot and cold water supply to ensure proper functioning.
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Connect the sink to the water supply

Connecting the sink to the water supply is a complex process that requires plumbing knowledge. Here is a step-by-step guide on how to do it:

First, locate the main water supply to your building and turn it off. This is usually where the water utility line enters your home, either inside or outside the room, and often near the water heating unit. It has a red handle that you turn clockwise to shut off the water. If your laundry room has supply valves, you can turn those off instead.

Next, locate the copper water supply lines in or on the wall of the room. There will be two lines: one for cold water and one for hot water. Use a hacksaw to cut through both lines. Clean the ends of the pipes with a 120-grit emery cloth until they shine, then brush an even layer of flux over them.

Now, you need to install copper tee fittings. Purchase two copper tee fittings and brush flux inside the openings. Slide the fittings onto the pipes, making sure the open end points outward towards where the sink will be. Solder the copper pipes together with a propane torch. Hold lead-free metal solder over the joints and heat it with the torch, moving the flame from side to side to ensure even melting.

Drill holes in the wall for wall anchors. Measure about a third of the way up the wall and use a masonry bit to drill holes behind each pipe. The holes should be smaller than the width of the copper wall anchors. Screw the anchors to the wall and gently guide the pipes into the anchors to secure them.

Finally, connect the faucet to the supply pipes with flexible supply lines. You will need a pair of flexible, braided, stainless steel supply tubes. Connect one end to each of the tee fittings and tighten the nuts with pliers. Run the other ends through the faucet, and your sink should now have running water!

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Frequently asked questions

The placement of the sink depends on where you want it and where it will fit. It should be close to the washer, as this is a source of hot and cold water and a drain point. It should also be easily accessible for plumbing work.

The sink should fit comfortably in the space you have available, with enough countertop area around it. You should also ensure there is enough room for a faucet and drain pipe.

Installing a sink in your laundry room requires plumbing knowledge and skills, such as working with PEX and copper pipes and installing fixtures. If you don't have these skills, it's best to hire a licensed plumber to ensure the job is done safely and efficiently.

Before beginning any installation work, turn off the home's main water supply line and any circuit breakers controlling wires that may run through the walls.

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