Outdoor Kitchen Sink Buying Guide: How to Choose the Right Sink for Your Alfresco Area

An outdoor kitchen is one of the best ways to make the most of your backyard, especially if you love entertaining. Whether you're building a complete alfresco kitchen with a BBQ, fridge and plenty of bench space, or simply creating a small outdoor cooking area, there's one feature we wouldn't overlook: the kitchen sink.

An outdoor kitchen sink makes everything from food preparation to washing up much easier, saving you countless trips back inside. But choosing the right one involves more than finding a sink that fits your benchtop.

From selecting weather-resistant materials to deciding on the right size, bowl configuration and tapware, here's what to consider before buying an outdoor kitchen sink.

Our Top Outdoor Kitchen Sink Picks

We've rounded up some of our favourite outdoor kitchen sinks at Buildmat, from compact options for smaller BBQ areas to larger sinks designed for serious alfresco entertaining. All feature 316 marine-grade stainless steel construction.

How to Choose the Right Sink for Your Alfresco Area

Choose a Sink Designed for Outdoor Use

First things first: not every kitchen sink is suitable for outdoor installation.While indoor and outdoor sinks might look almost identical, the materials they're made from can be quite different. Outdoor sinks need to withstand moisture, temperature changes and, depending on their location, rain, salt air and other environmental conditions.

That's why we'd recommend choosing a sink specifically designed for outdoor use, rather than assuming your favourite indoor kitchen sink will do the job.

Is stainless steel good for outdoor kitchen sinks?

Yes, stainless steel is one of the best materials for outdoor kitchen sinks, provided you choose the right grade. The two grades you'll commonly come across are 304 and 316 stainless steel.

Our recommendation: For an outdoor kitchen, particularly one near a swimming pool or in a coastal area, we'd choose 316 marine-grade stainless steel.

At Buildmat, our alfresco sinks include 316 stainless steel options designed for Australian alfresco spaces.

It's worth remembering that even marine-grade stainless steel requires maintenance. Regular cleaning and rinsing help prevent surface staining, particularly in coastal environments.

What's the Best Outdoor Kitchen Sink Size? 

When choosing an outdoor kitchen sink, bigger isn't necessarily better. The ideal size depends on how much bench space you have and how you plan to use your outdoor kitchen.

If your outdoor area is mainly for entertaining, a smaller sink might be all you need for rinsing glasses, washing your hands and preparing drinks. However, if you're regularly cooking complete meals outdoors, you'll probably appreciate a larger bowl.

Here's a general guide to choosing your sink size.

Don't forget your cabinet size

One mistake we often see is choosing a sink based on its appearance without checking whether it will fit the cabinetry underneath.

Before ordering, confirm:

• The external sink dimensions and minimum cabinet size.

• The bowl depth and available space for plumbing.

• How much usable benchtop will remain around the sink.

• Whether there's sufficient room for your chosen kitchen mixer.

If you're still planning your outdoor kitchen layout, we'd recommend selecting your sink before finalising the cabinetry and benchtop cut-outs.

Single vs Double Bowl Outdoor Kitchen Sinks

Should you choose a single or double bowl sink for your outdoor kitchen? It really comes down to how you use the space.

Single bowl outdoor sinks

A single bowl sink is a popular option for outdoor kitchens because it provides plenty of usable washing space without taking up too much room.

A larger single bowl can also make washing BBQ accessories, serving platters and cooking utensils easier.

We'd recommend a single bowl if you have a compact outdoor kitchen, want to maximise bench space or primarily use your sink for food preparation and occasional washing up.

Double bowl outdoor sinks

If your outdoor kitchen is more like a second kitchen, a double bowl sink might be worth considering.

Having two separate bowls allows you to rinse vegetables in one while keeping the other available for washing dishes, or separate food preparation from cleaning up.

The trade-off? Double bowl sinks generally require more bench space, and the individual bowls may be smaller than those in a similarly sized single bowl sink.

Consider a Sink With a Drainboard

An integrated drainboard might not seem essential, but it can be particularly handy in an outdoor kitchen.

A drainboard gives you a dedicated area for drying dishes, resting washed vegetables or placing utensils after rinsing, without leaving water across your benchtop.

It's especially practical if your outdoor kitchen doesn't have a dishwasher or you regularly wash up outside.

However, a drainboard takes up additional bench space, so consider whether you'd prefer a larger bowl or more preparation space instead.

If you're working with a smaller outdoor kitchen, removable sink accessories can offer similar functionality without permanently sacrificing benchtop space.

Choose Between an Undermount and Topmount Outdoor Sink

The way your sink is installed will affect both the appearance and practicality of your outdoor kitchen.

Topmount outdoor sinks

Topmount sinks are installed from above, with the sink rim resting on the benchtop surface.

They're generally more straightforward to install and can be suitable for a wider range of benchtop materials.

Undermount outdoor sinks

Undermount sinks sit beneath the benchtop, creating a cleaner, more integrated appearance.

They're particularly popular in contemporary outdoor kitchens with stone or other suitable solid benchtops. You can also wipe crumbs and water directly from the bench into the sink without a raised rim getting in the way.

Which is better? If you're after a seamless, minimalist look, an undermount sink is worth considering. If ease of installation and flexibility are your priorities, a topmount sink may be more practical.

Not every sink supports both installation methods, so check the manufacturer's specifications and confirm your benchtop material is suitable before ordering.

Match Your Outdoor Sink With the Right Tapware

Your sink is only half the equation. You'll also need an outdoor kitchen tap that suits the sink's dimensions and how you plan to use it.

Just like outdoor sinks, kitchen mixers need to be suitable for the installation environment.

We'd recommend looking for outdoor-rated tapware made from corrosion-resistant materials, particularly 316 stainless steel for exposed or coastal areas.

Some popular outdoor kitchen tap styles include:

• Gooseneck mixers: A versatile choice with a high, curved spout that makes filling pots and washing larger items easier.

• Pull-out mixers: Ideal for rinsing vegetables, cleaning around the sink and reaching into the corners of larger bowls.

• Square mixers: A contemporary option that works particularly well with modern, architectural outdoor kitchens.

• Swivel mixers: Allow you to move the spout between different areas of the sink, which can be useful for double bowl configurations.

Before buying, check the tap's spout reach, height, mounting requirements and compatibility with your sink.

Don't Overlook Outdoor Sink Accessories

The right accessories can make a relatively simple outdoor kitchen much more practical.

For example, if you're working with limited bench space, a chopping board or sink lid that fits over your sink can create additional preparation space when the bowl isn't in use.

Other accessories worth considering include:

• Sink lids and BBQ trays: Useful for covering the sink or adding temporary preparation space, depending on the product design.

• Sink protector grids: Help protect the base of the sink from scratches caused by pots, pans and utensils.

• Colanders: Handy for rinsing vegetables, draining food and preparing ingredients outdoors.

• Dishracks and drainboards: Provide a designated space for drying glasses, plates and cooking utensils.

Explore our outdoor sink accessories to find options compatible with your chosen sink.

How Much Does an Outdoor Kitchen Sink Cost?

The price of an outdoor kitchen sink depends on its material, size, brand and configuration. As a general guide, an alfresco kitchen sink made with 316 grade stainless steel could cost anywhere from $500 to over $2,000.

While you might find cheaper stainless steel kitchen sinks designed for indoor use, we'd prioritise material quality and outdoor suitability over the initial purchase price.

After all, replacing a corroded sink and potentially modifying your benchtop isn't anyone's idea of a good weekend.

Plan Your Outdoor Kitchen Sink Before You Build

One final piece of advice: don't leave choosing your outdoor kitchen sink until the end of your renovation.

Your sink selection affects several other decisions, including cabinet dimensions, benchtop cut-outs, tap placement and plumbing requirements.

Before finalising your outdoor kitchen design, we'd recommend confirming the sink model and dimensions with your cabinetmaker or builder, and having a licensed plumber check the water supply and drainage requirements.

It's also worth thinking about how your sink will work alongside the BBQ, fridge and preparation areas. Ideally, you want enough room to move between cooking, rinsing and serving without constantly crossing the entire outdoor kitchen.

Shop Outdoor Kitchen Sinks at Buildmat

Whether you're designing a compact BBQ station or a complete alfresco kitchen, choosing the right sink will make your outdoor space easier to use for years to come.

At Buildmat, we stock a range of 316 marine-grade stainless steel outdoor sinks, including compact single bowls, larger preparation sinks and double bowl options. You can also find matching outdoor kitchen tapware and accessories to complete your setup.

Not sure which sink will suit your space? Visit our Buildmat Selection Centre in Hughesdale, Melbourne, by appointment, or get in touch with our team for help choosing the right size and configuration.

FAQs

What's the best sink for an outdoor kitchen?

For most outdoor kitchens, we'd recommend a 316 marine-grade stainless steel sink designed specifically for outdoor use. It's corrosion-resistant, easy to clean and suitable for a range of alfresco applications. The best size and configuration will depend on your available space and how often you cook outdoors.

Can you use a normal kitchen sink outside?

Not every indoor kitchen sink is suitable for outdoor use. Indoor sinks are often made from 304 stainless steel, while outdoor sinks commonly use 316 stainless steel for greater corrosion resistance. Always check whether the manufacturer approves the sink for your intended outdoor installation.

What size sink is best for an outdoor BBQ area?

For a compact BBQ area, a sink around 300-450mm wide may be sufficient for rinsing utensils and preparing drinks. For a larger outdoor kitchen where you regularly prepare food and wash dishes, we'd consider a sink around 500-700mm wide or larger, depending on your cabinetry.

Do outdoor stainless steel sinks rust?

Stainless steel is corrosion-resistant, but it isn't completely immune to rust or surface staining. Grade 316 stainless steel offers greater corrosion resistance than 304, particularly in coastal and high-moisture environments. Regular cleaning, rinsing and appropriate maintenance will help keep your sink in good condition.