Top Mount Kitchen Sinks
Top mount kitchen sinks are sinks with a finished rim that rests on top of the countertop and covers the cut edge of the opening. Also called drop-in kitchen sinks or self-rimming kitchen sinks, they install from above, are secured with mounting clips and sealant, and fit laminate, solid surface, stone, and butcher block countertops.
The rim carries the weight of the sink and seals the opening, so the countertop edge does not need polishing or finishing. That makes top mount sinks a practical fit for new residential kitchen sinks, remodels, and like-for-like replacements in an existing cutout. This category includes single and double bowl models, stainless steel sinks in several gauges, and faucet hole layouts from one to four holes. Use the groups below to match bowl layout, size, and drilling to the cabinet and fixtures on the job.
Top Mount Kitchen Sink Products
Single Bowl Top Mount Sinks
A single bowl provides one open basin with no center divider, built for washing large pots, sheet pans, and roasting racks. Single drop-in kitchen sink bowls suit compact kitchens and prep areas, and they connect to a disposal or a basket strainer at one drain opening.
Double Bowl Top Mount Sinks
Double bowl models split the basin into two compartments for washing and rinsing at the same time. Equal 50/50 splits give two matching bowls. Offset splits, such as 60/40 or 70/30, pair a larger bowl for cookware with a smaller bowl for rinsing or a disposal.
Top Mount Stainless Steel Kitchen Sinks
Top mount stainless steel kitchen sinks are commonly built from 16 to 22 gauge steel, and a lower gauge number indicates thicker steel. Many models include sound-deadening pads or undercoating on the bowl exterior, which reduce noise from running water and disposals and limit condensation inside the base cabinet.
Faucet Hole Configurations
Top mount sinks are drilled with one to four holes on the rear deck. Hole count sets which kitchen faucets and accessories the sink accepts: a single-hole faucet, a side sprayer, a soap dispenser, or an air gap. A hole cover closes any unused opening.
Standard Sizes, Including 33 x 22
The 33 x 22 drop-in kitchen sink is a standard residential size, offered in single and double bowl versions. Compact prep models start near 15 x 15 inches, and larger units run 36 inches wide or more. Bowl depth typically ranges from 7 to 10 inches.
How Top Mount Sinks Work and Where to Use Them
Rim and Mounting Method
The sink drops into a countertop cutout sized slightly smaller than its outer rim. The rim rests on the countertop surface, and mounting clips under the deck pull it down against a bead of sealant. The sealant closes the joint and keeps water out of the countertop substrate.
Kitchen Sink Installation Styles Compared
The three main kitchen sink installation styles are top mount, undermount, and dual mount. Undermount sinks attach below the countertop and need a finished cutout edge. Dual mount sinks are designed for either method. Top mount models install from above and offer the most direct route for replacing a sink in an existing opening.
Countertop and Project Fit
Top mount installation is compatible with laminate, solid surface, butcher block, granite, and quartz countertops. It is the standard method for laminate, which cannot leave a cut edge exposed. The rim also covers minor chips or uneven cuts at the opening, which helps on replacement work in older kitchens.
Key Specifications and Planning Steps
1. Measure the cutout. For a replacement, record the existing opening length, width, and corner radius, then confirm the new rim overlaps it on every side.
2. Confirm cabinet size. Check the minimum base cabinet width in the manufacturer specifications. A 33 inch sink often calls for a 36 inch cabinet, but this varies by model.
3. Match faucet holes. Check hole count and spacing against the faucet and accessories.
4. Check drain clearance. Most kitchen sinks use a 3-1/2 inch drain opening. Confirm bowl depth leaves room for the disposal and trap.
5. Seal the rim. Apply the sealant the manufacturer specifies, such as products from putty, caulk, and sealants, before tightening the clips.
6. Confirm components. Clips, strainers, and templates vary by model; source missing items from kitchen sink parts and accessories.
Choosing the Right Top Mount Kitchen Sink
Start with the cabinet and cutout, which limit the size of top mount kitchen sinks. Next, choose a bowl layout: a single bowl for large cookware, an equal double bowl for washing and rinsing, or an offset double bowl when one side carries a garbage disposal. Bowl split and drilling separate most kitchen sink configurations, so match hole count to the planned fixtures. For stainless steel, weigh gauge and sound-deadening features against expected use, and confirm listing to ASME A112.19.3/CSA B45.4. Where the countertop stays, kitchen sink designs that fit the existing cutout limit the job to a sink swap. Compare other mounting types under kitchen and bar sinks.
Frequently Asked Questions
Where can I buy top mount kitchen sinks for a residential remodel in the US?
Top mount kitchen sinks are sold through plumbing supply distributors, kitchen and bath suppliers, and home centers across the US. For a remodel, compare models by bowl layout, gauge, faucet hole count, and minimum cabinet size, and confirm the rim covers the planned cutout.
What should I look for when buying a 33 x 22 drop-in kitchen sink for a 36 inch base cabinet?
Check the manufacturer's stated minimum cabinet width and cutout dimensions for that model. Many 33 x 22 drop-in kitchen sink models list a 36 inch minimum cabinet, but not all do. Also confirm bowl depth, gauge, and faucet hole count.
What is the difference between a top mount sink and an undermount sink?
A top mount sink drops into the cutout from above, and its rim rests on the countertop and covers the cut edge. An undermount sink attaches below the countertop, which requires a finished cutout edge and a countertop that can support it. Top mount models are typically simpler to replace.
Is an 18 gauge or 20 gauge stainless steel drop-in kitchen sink better for a rental kitchen?
A lower gauge number means thicker steel, so 18 gauge is thicker than 20 gauge and resists denting and flexing more. Either can serve a rental kitchen. The right choice depends on expected use, budget, and the sound-deadening features of the specific model.
Single bowl or double bowl top mount sink: which works better for a family kitchen?
A single bowl gives the most open space for large pots and soaking. A double bowl separates washing from rinsing or food prep. Double bowl models generally need a wider base cabinet, so check the minimum cabinet size before choosing.
Can a top mount kitchen sink replace an undermount sink, and what countertop changes might be needed?
Often yes, if the new rim fully covers the existing cutout on every side. The countertop material must support the rim and clips. If the existing opening is larger than the new rim allows, the countertop may need modification or replacement.
How do I measure an existing drop-in sink cutout so the replacement sink fits?
Remove the old sink, then measure the opening's length, width, and corner radius. Compare those numbers to the new sink's cutout dimensions and installation template. The new rim must overlap the opening on all sides.
Why is my drop-in kitchen sink leaking around the rim, and how do I reseal it?
Rim leaks usually come from failed sealant or loose mounting clips. Loosen the clips, remove the old sealant, clean both surfaces, and apply the sealant the manufacturer specifies before retightening. Sealants and replacement clips are available in sink parts and sealant categories.
How many faucet holes do I need in a top mount kitchen sink?
It depends on the faucet and accessories. A single-hole faucet needs one hole; a side sprayer, soap dispenser, or air gap each add one. Check the faucet's requirements and the sink's drilling, and cap any unused holes.
What features help reduce noise and vibration in a stainless steel top mount kitchen sink?
Sound-deadening pads and undercoating on the underside of the bowls absorb vibration from running water and disposals. Thicker, lower gauge steel also flexes less. Undercoating limits condensation in the base cabinet.
What does self-rimming kitchen sink mean, and is it the same as a drop-in sink?
Yes. Self-rimming kitchen sinks, drop-in kitchen sinks, and top mount sinks commonly describe the same design: a sink whose rim rests on the countertop and supports its weight.
Which countertop materials work with top mount stainless steel kitchen sinks?
Top mount stainless steel kitchen sinks are compatible with laminate, butcher block, solid surface, granite, and quartz. The countertop must be in sound condition around the cutout, the opening must match the sink's cutout dimensions, and installation should follow the manufacturer's instructions.
What size cabinet do I need for a double bowl drop-in kitchen sink?
It depends on the sink. Each model lists a minimum base cabinet width in its specifications. Use that stated figure, not a general rule, and allow room for the faucet, drain, and any disposal.
What are the most common kitchen sink installation styles, and when is a top mount sink the right choice?
The common kitchen sink installation styles are top mount, undermount, and dual mount. A top mount sink fits laminate countertops, replacement work in existing cutouts, and projects that call for installation from above.
: What components should I check for when installing a top mount kitchen sink, and which ones may be sold separately?
Check the included components list for mounting clips, a cutout template, a basket strainer, and a drain assembly. Strainers, disposals, and supply lines are often sold separately and vary by model, so confirm before the install.