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Custom Kitchen Countertop Design: Shapes, Peninsulas & Islands, Cutouts, Waterfall Edges

Choosing the kitchen countertop is one of the most important tasks of a renovation or new construction. A nice custom countertop design makes all the difference in the look of the kitchen and in your routine.

In this article, we’ll go through kitchen layouts, possible countertop shapes, dimensions and positions of cutouts, when to have a peninsula or an island counter, and waterfall edges. Read these other articles for:

Kitchen countertop shapes

Let’s start by determining the placement and shape of your countertops. This depends on your kitchen layout.

I-shaped single countertop

In narrow kitchens, there might be no option besides having sink, cooktop and fridge side by side.

I-shaped custom kitchen countertop with white tile backsplash
Project by Iná Arquitetura
I-shaped custom kitchen countertop with white tile backsplash
I-shaped custom countertop with subway white tiles on backsplash. Industrial style kitchen
Project by Garimporio
I-shaped countertop in narrow kitchen

The kitchen can be completely open to the living room, with no island countertop separating it from the furniture. This solution is recommended for narrower living rooms, where an extra counter would take up too much space.

I-shaped countertop in kitchen completeley open to the living room
Project by Casa 100
I-shaped countertop in kitchen completeley open to the dining room

No matter your kitchen layout, you should always place the sink and the stove close to each other and to the fridge. This will make you routine easier.

The project below, for instance, has a super wide counter, but the appliances and sink were placed all close to each other and the dining table. The rest of it was left with no cutouts, besides the living room furniture.

I-shaped countertop in kitchen completeley open to the living room
Project by CR2 Arquitetura
I-shaped countertop in kitchen completeley open to the living room
Project by Iná Arquitetura

I-shaped countertops are also used in wider kitchens that have the sink and the range on one side and the fridge and tall cabinets on the other side. The cabinets can also embed wall ovens, microwaves, etc.

Kitchen backsplash height - up to the ceiling - tiles on all walls. I-shaped countertop
Project by Diego Revollo

L-shaped single countertop

In wider kitchens, you may make a better use of the available space with an L-shaped countertop.

Custom kitchen countertop design - L-shaped
Custom kitchen countertop design - L-shaped
Custom kitchen countertop design - L-shaped. Colored subway tiles on kitchen walls
Custom kitchen countertop design - L-shaped

If you have room for an L-shaped counter, it probably makes sense to place the sink on one part and the stove on another.

Then you can create a work triangle between them and the fridge. This will probably make traffic around the kitchen easier.

Custom kitchen countertop design - L-shaped
Project by PKB Arquitetura
Custom kitchen countertop design - L-shaped. Backsplash height - white subway tiles up to the ceiling
Custom kitchen countertop design - L-shaped
Custom kitchen countertop design - L-shaped. White tile backsplash
Custom kitchen countertop design - L-shaped
Project by Monica Wipfi
Custom kitchen countertop design - L-shaped. White square tiles on walls

U-shaped single countertop

Even wider kitchens can fit U-shaped countertops. They can have the sink on one part, the range on another, and still another part for preparing and serving food.

Depending on the shape of the kitchen, it may be better to place sink and range facing each other or as an L.

Custom kitchen countertop design - U-shaped
Custom kitchen countertop design - U-shaped
Custom kitchen countertop design - U-shaped. Subway white tiles on walls

Custom kitchen countertop design - U-shaped. Black grouted white square tiles on kitchen walls - backsplash different from countertop material
Project by Shoko Design
Custom kitchen countertop design - U-shaped

Two countertops facing each other

Instead of an U-shaped single countertop, you may want to leave the side walls free (or have no side walls at all) and have two separate countertops.

Then you have basically 3 options on where to place the sink and the range:

  • Placing them side by side and having a counter free of cutouts, with plenty of space for cooking and serving meals.
Custom kitchen countertop design - I-shaped countertop + island
Project by Boscardin Corsi
Custom kitchen countertop design - I-shaped countertop + island
Project by Arkitito
  • Placing the sink on the wall counter and the range on the other one, facing the dining room. This way you can be looking at the rest of the house and hanging out with the people around it while you cook, instead of facing a wall.
Custom kitchen countertop design - I-shaped countertop + island with range facing the dining room
Project by BC Arquitetos
Custom kitchen countertop design - I-shaped countertop + island with range facing the dining room
Custom kitchen countertop design - I-shaped countertop + island with range facing the dining room
  • Placing the range on the wall countertop and the sink on the other one, facing the dining room. Same advantage as the previous option, but for the one who’s washing dishes instead of cooking. It may make sense if you spend more time using the sink than the range, but remember you should also have a drying rack by the sink, which won’t make the kitchen look the best.

To decide between these layout options, you may want to try sketching all the possibilities for the shape of your kitchen. Then check in which one you get more counter area, space for cabinets and free space to circulate.

If you’re renovating, also consider the current position of water and gas pipes and electric outlets when deciding the new layout. The more you need to adapt those, the more expensive and long the renovation will be.

Peninsulas and islands between kitchen and dining room

Regardless the countertop shape, if your kitchen is open to the living or dining room, your layout may include a countertop with no wall behind it. Instead, it creates a slight separation between the two rooms, and serves them both.

There are two types or counters for that situation. Let’s see the difference between them.

Peninsula countertops

This type is connected to a wall on one side.

It’s ideal for L or U-shaped countertops that have one part with the sink, facing a wall, and another one separating the kitchen from the living room.

Custom kitchen countertop design - L-shaped countertop with peninsula
Custom kitchen countertop design - L-shaped countertop with peninsula. Short backsplash

Floor, walls and countertops in the same material - polished concrete
In kitchens with two countertops facing each other, a peninsula may also be the best way to go. If you have a limited width, you may want to have the counter as wide as possible and the entrance to the kitchen on one side only. Project by Fernando Calio
Custom kitchen countertop design - I-shaped counter with peninsula
Even I-shaped counters can have a peninsula, when the counter is wider than the wall behind it.

Island countertops

This type is more recommended for larger kitchens, where the counter can be wide enough and still allow the entrance to the kitchen through either side.

It’s usually used in layouts with two parallel countertops.

Custom kitchen countertop design - I-shaped countertop + island - same material on backsplash - stone
Custom kitchen countertop design - I-shaped countertop + island
Project by be.bo.

But that’s not a rule. There are endless possible kitchen layouts that would be benefited by an island countertop.

Custom kitchen countertop design - cooktop and sink on island counter
You can have a single island countertop with cooktop and sink and let cabinets and appliances by the wall.
Custom kitchen countertop design - cooktop on island counter
This island countertop with cooktop is on front of a wall countertop with sink. But they’re not parallel. If it makes more sense in the shape of your space, why not?

How to determine the positions of sink and range cutouts

You already decided the basic layout of your kitchen and the countertops shapes.

But in order to determine the exact position of the cutouts, you should first decide how the cabinet under it will be distributed (read the article on kitchen cabinets to learn how).

Once its divisions are determined, you can center the range in one of the modules and the sink in another, for example. Not only it will make your kitchen look better, you will make the most of the cabinet space.

Kitchen backsplash height - up to the cabinets - Design and cutouts
Nice finishes, but isn’t it a bit annoying that the sink is not centered over the pair of doors? Project by PKB Arquitetura
Cutouts for sink and cooktop
The modules don’t even need to have the same width. The cabinets alignment with the sink and the cooktop makes the kitchen look nice and organized. In this case, they also make the most of the space, as the modules under the sink and the oven are just as wide as needed. So the other modules can use the entire under counter height.

If there is enough width, leave some space on both sides of the sink, to create an area for cooking and dirty dishes and another for a drying rack.

Cutouts for sink and cooktop
The cooktop is on one edge, centered over a stack of drawers, and the sink is centered over a pair or cabinet doors, with space on both sides. The left side will be more used for dishes and the right side, for cooking.
Cutouts for sink and cooktop - Backsplash and Countertop in same material - black marble
Here, besides from the alignments and the maximum use of the available space, the modules also have equal widths. This is as organized as a kitchen can look.

As for the cutout dimensions, just choose the sink and the range/cooktop and check their manuals.

Leave at least 5 cm / 2″ between cutouts and edges so you don’t weaken the stone. I do not recommend exceeding this offset too much on front, as the sink or cooktop gets uncomfortable to reach. Keep it up to 10 cm / 4″.

What is a waterfall countertop?

A waterfall countertop doesn’t touch a wall on one or both sides, so its material turns down and continues all the way to the floor.

Custom kitchen design - marble island countertop with waterfall side
The side panel finishes the side of the under counter cabinets.
Custom kitchen design - concrete countertop with waterfall side
It may also be required to support the top.

The “waterfall” side piece is not always needed or wanted. The counter can get cheaper without it.

Custom kitchen countertop design
If you have a small counter, you may prefer to support it on the wall only. It looks lighter and makes the underneath space more versatile (for someone to sit down by the edge, for example). Project by Metamoorfose Studio
Custom kitchen design - marble island countertop with blue cabinets
Even if you do have cabinets under the counter, the waterfall finish is not needed. You can have a well finished side on your cabinets. It is really up to you. Project by Jessie Thomas Designs

Now you already know everything you need to design a custom kitchen countertop just the way you like.

To complete your project, how about checking our articles on kitchen sinks and faucets?

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