Convert Your Single Sink Kitchen to Double Sink Bliss

Having only one sink in your kitchen can be a major inconvenience. From washing dishes to food prep, a single basin forces you to take turns using the space. But converting your existing single sink to a doublesink configuration can make your kitchen's function and style shine.

Transforming to a double sink opens up a world of benefits. You’ll gain more room for multitasking and organization. Entertaining and cooking elaborate meals becomes easier with each person or task getting their own sink. And the symmetrical look of two sinks brings visual balance to your kitchen's layout.

Determine If You Need a Permit

Before starting demo work, it's crucial to check if a permit is required. Plumbing alterations like adding a sink often need approval from your local building department. Requirements vary by municipality, so contact your local office to ask.

If a permit is needed, submit the application several weeks in advance. You'll provide details like the scope of work being done and fixtures being added. Allow time for the permit approval process before purchasing materials or beginning construction.

Research Local Building Codes

Building codes provide the regulations for construction and renovation work. Plumbing codes outline when permits are required, proper venting rules, and other critical guidelines to follow.

Before you demolish your existing sink, research plumbing codes for your area. This ensures you plan correctly for important steps like venting and drainage.

Submit Permit Application If Needed

The permit application asks for key information like your contact details, property address, and the scope of the project. For adding a sink, you'll specify that you're installing new plumbing fixtures.

Include rough sketches of the sink locations and drains. Pay any permit fees when you submit the paperwork. Then wait for it to be reviewed and approved before starting work.

Choose Your Sinks

With so many sizes, materials, and mounting options, selecting your new sinks is an exciting step. Keeping your kitchen's style in mind will help narrow down the choices.

Settle on your ideal mounting method first - undermount or drop-in. Then pick basin materials and configurations that speak to your design taste.

Decide on Mounting Style

Undermount sinks offer a seamless, built-in look many love. But they require a solid surface counter material like quartz or granite. Their installation takes more effort too.

Drop-in sinks are mounted above the counter. Exposed seams give these a more classic look. They’re typically less expensive and easier for DIYers to install.

Select Your Sinks

Stainless steel is a popular sink material that's durable and easy to clean. Composite granite and solid surface sinks offer rich color and texture. Ceramic sinks provide a glossy, vintage aesthetic.

Beyond material, look at basin dimensions and depth. Sinks come in standard or farmhouse/apron-front designs. Select ones that complement your faucets and kitchen decor.

Pick Faucets

Look for faucets with finishes that match your sinks and cabinet hardware. Widespread faucets with separate handles offer flexibility in placement. Centerset configurations keep things compact.

For a unified look, faucets with a single handle/spout are ideal. Pick ones with smart features if you’d like touchless or voice-activated operation.

Prep the Cabinet for Installation

With your sinks and faucets selected, now focus on adjustments so your cabinet can accommodate them. First, confirm you have adequate width for a double basin.

If your existing base cabinet is too narrow, explore modifying or replacing it. Proper cabinet prep ensures your new sinks fit and function beautifully.

Confirm Cabinet Width

Standard double sink base cabinets are 30, 33, or 36 inches wide. Measure across your current sink cabinet to ensure it's big enough before finalizing sink sizes.

Allow 1-2 inches of countertop on either side for supports. If your cabinet is too narrow, expanding or replacing it will be required.

Modify or Replace Cabinet as Needed

To widen your existing cabinet, remove the side panel. Cut and attach wood to extend it to fit your double sink.

For more room, installing a larger custom sink base or vanity cabinet may be needed. Just be sure to address the flooring and side walls when sizing up.

Cut Sink Base Cutouts

Use the sink templates to mark the cutout shape on the counter. For solid surface, make cuts with a jigsaw using a fine-tooth blade. On stone counters, use a diamond-tipped hole saw kit.

Wear protective gear and follow all safety precautions when cutting. Clean up edges smoothly to allow sinks to sit flush.

Update Plumbing for Double Sinks

Expanding from one sink to two requires reconfiguring your plumbing. Ideal drainage involves tying both basins into your existing drain line.

Carefully plan supply line placement and shutoffs for each sink. Venting may need updating too if codes require it.

Plan Drain Line Modifications

If the two sink basins are close together, their drains can likely tie into the current drain line. Use wyes and tee fittings to connect them.

For sinks spaced far apart, installing a new drain line and vent may be needed. Involve a professional plumber for proper drainage.

Configure Supply Lines and Shutoffs

Run water supply lines to each planned faucet location. Install individual angle stop valves to control water flow to each basin.

Ensure supply line length is adequate. Leave some excess for adjustability during faucet installation.

Update Venting as Needed

Adding drains requires proper venting to avoid water trap issues. Consult a plumber to ensure your setup meets code.

Vents release sewer gases and allow drains to flow freely. New vents may need to be added if existing ones are insufficient.

Install Your New Sinks

You've selected beautiful sinks and prepped the space. Now it's time for the fun part - installing your new basins and faucets. Follow all instructions closely.

Work carefully when securing undermount sinks and connecting drains and supply lines. Leak-free installation ensures years of service.

Secure and Seal Sinks

For undermount sinks, clean the counter and sink edges before applying adhesive sealant. Position and attach using brackets or clips.

Seal the sinks to the counter on all sides with silicone caulk. Smooth any squeeze-out for a neat finish.

Connect Drain Pipes and P-Traps

Assemble the sink drain baskets, P-traps, and tailpieces as directed. Maintain a downward slope toward the drain.

Tighten all slip joints securely. Adjust traps as needed to gain proper sink clearance.

Hook Up Faucets and Supply Lines

Place the faucets according to manufacturer instructions. Connect hot and cold supply lines to the appropriate stop valves.

Turn on water and carefully check for leaks. Tighten fittings as needed to remedy any issues.

Finishing Touches

Once your sparkling new double sinks are fully installed, add those beautiful final details. Backsplashes, window treatments, and decorative fixtures take the makeover to the next level.

When admiring your upgraded kitchen, take pride in the skills you've gained. And let your new double sink convenience enhance how you cook and clean.

What size cabinet is needed for a double sink?

Standard double sink base cabinets are typically 30-36 inches wide. Measure your existing cabinet to ensure adequate room.

How difficult is the plumbing for adding a sink?

If both sinks can share an existing drain line, plumbing is moderately difficult. Separate drains are more complex - consult a pro.

Should I do undermount or drop-in sinks?

Undermount has a seamless look but takes more skill. Drop-ins are less expensive and simpler to install.

Do I need a permit for adding another sink?

Usually yes, due to the plumbing work involved. Always check your local building codes and requirements.

How do I cut the sink holes in the countertop?

Use the sink template as a guide. Cut solid surface with a jigsaw, stone with a diamond hole saw. Take safety precautions.