800mm Double Belfast Sink: What Base Unit Size Do You Need?

An 800mm double Belfast sink does not normally sit inside an 800mm standard base cabinet. The sink needs a purpose-designed cabinet that supports the ceramic bowl, leaves room for the exposed front and provides enough width for fitting and adjustment.

For the Painted Kitchens 800mm double-bowl ceramic sink, the usual matching cabinet is the 880mm BELFAST 2 double sink base. That additional cabinet width provides the frame and structure around the sink rather than leaving the ceramic bowl unsupported between two narrow cabinet sides.

However, the model names alone are not enough to confirm the fit. Hand-fired ceramic sinks can vary from their nominal dimensions, and sinks from different manufacturers may have different bowl profiles, depths and apron shapes. The actual sink should therefore be checked against the cabinet specification before the kitchen is ordered or fitted.

This guide explains why an 800mm double Belfast sink normally needs an 880mm base, when a larger cabinet may be required and what measurements need confirming.

What size base unit is used for an 800mm double Belfast sink?

The Painted Kitchens BELFAST 2 double Belfast sink base is 880mm wide and is designed for Belfast and butler-style sinks up to 800mm wide.

Its listed cabinet dimensions are:

• 880mm cabinet width
• 870mm cabinet height
• 580mm cabinet depth
• Options for sinks approximately 220mm or 250mm tall

The extra width does not mean there should be an obvious 80mm empty gap beside the sink. The cabinet measurement includes its outer structure, in-frame front and the material needed to support and visually frame the ceramic bowl.

The sink itself sits within the prepared sink opening, with its apron front exposed above the cabinet doors. The final fit depends on the actual sink dimensions, frame arrangement and installation method.

Why can an 800mm sink need an 880mm cabinet?

Kitchen cabinet names often describe their complete external width, while sink names usually refer to the approximate width of the ceramic product. They are not measuring the same thing.

An 880mm Belfast base needs room for:

• The sink bowl and exposed apron
• The cabinet sides and structural support
• The left and right parts of the front frame
• The doors beneath the sink
• A small amount of fitting tolerance
• Any site adjustment required for the individual ceramic sink

A conventional 800mm cupboard would use much of its width for the cabinet sides, hinges and front structure. Its internal opening would therefore be narrower than 800mm, making it unsuitable for an 800mm-wide apron-front sink.

This is why a dedicated Belfast sink cabinet should be selected using the sink opening and compatibility information, not simply by matching the number in the product name.

Does every 800mm Belfast sink fit an 880mm base?

No. An 880mm sink base may be designed for sinks up to 800mm wide, but that does not mean every sink sold as 800mm will fit without checking or adjustment.

Different manufacturers can use different:

• Exact external widths
• Bowl depths
• Front apron shapes
• Corner radiuses
• Wall thicknesses
• Underside profiles
• Sink heights

Some ceramic sinks also taper slightly or have an irregular handmade profile. Two sinks sold under the same nominal width may not be identical when measured.

The safest route is to choose the sink and base together, or provide the complete manufacturer dimensions when requesting the cabinet.

Why do ceramic Belfast sink dimensions vary?

Fireclay and other hand-fired ceramic sinks are shaped and fired at high temperatures. Small dimensional variation can occur during this process.

The Painted Kitchens 800mm double-bowl sink carries a warning that hand-fired ceramic sinks can have a tolerance of up to 5%. This means the supplied sink may be slightly larger or smaller than the nominal measurement.

A 5% tolerance should not be treated as a prediction that every sink will differ by the full amount. It is a warning that the final product must be measured rather than relying entirely on the catalogue name.

Variation is particularly important when:

• The cabinet opening has been made extremely tight
• The worktop is being templated before the sink arrives
• The sink comes from a different supplier than the cabinet
• The front frame has already been painted and finished
• The sink height is close to the limit of the selected base option

Should the sink be ordered before the cabinet?

Where practical, having the sink available before final fitting gives the installer the clearest information. The actual ceramic product can be measured and offered up to the cabinet rather than relying only on nominal dimensions.

This is particularly useful because an installer may need to make small adjustments to the supporting structure or sink opening.

The kitchen can still be designed before the physical sink arrives, but the order should identify:

• The exact sink make and model
• The manufacturer’s stated width
• The overall front-to-back depth
• The sink height
• The number and arrangement of bowls
• The apron-front dimensions
• Any manufacturer fitting diagram

Do not allow a worktop opening or final sink support to be based on an online title alone.

What measurements should you check?

Overall sink width

Measure the widest point of the physical sink. Do not assume that a product described as 800mm measures exactly 800mm across every edge.

Front-to-back depth

Check how far the sink projects towards the back of the cabinet and how much worktop remains behind it. This affects tap positioning and the space available between the sink and wall.

Sink height

The BELFAST 2 cabinet is available for sinks around 220mm or 250mm tall. The correct option needs to match the actual sink height so that the apron front sits at the intended level.

Apron-front width and shape

The exposed front may not be perfectly square. Check whether its sides are straight, tapered or rounded and whether the cabinet frame can be adjusted to create an even appearance.

Bowl and waste positions

A double-bowl sink has two waste outlets and connecting pipework. The cabinet interior must leave enough room for the waste kit, traps and any additional plumbing.

Worktop and tap space

Most Belfast sinks do not include a conventional tap deck. The tap is usually fitted into the worktop behind or beside the sink, so the plan must leave enough material and clearance for the chosen tap.

How is the 800mm double Belfast sink supported?

A heavy ceramic sink should be supported by the cabinet structure beneath it. It should not depend on the worktop alone to carry its weight.

The exact support method should be determined by the cabinet design, sink instructions and installer. The sink needs to remain stable when empty and when filled with water, cookware or washing-up.

The support arrangement may also need to accommodate small variations in sink height so that the top edge aligns correctly with the worktop.

This is another reason to use a dedicated Belfast sink base unit rather than cutting an unsuitable standard cabinet without a clear support plan.

Do you need the 1080mm Belfast base instead?

The larger BELFAST 3 base is 1080mm wide and is designed for larger Belfast and butler sinks up to 1000mm wide.

It may be the appropriate choice when:

• The chosen sink is wider than 800mm
• The sink manufacturer specifies a larger opening
• A larger double-bowl or oversized ceramic sink is being used
• The sink apron or bowl profile will not suit the 880mm base
• A wider sink feature is required within the kitchen layout

It should not be chosen automatically for an 800mm sink simply because more width appears safer. A cabinet that is unnecessarily wide can affect adjacent units, dishwasher position, worktop cost and the symmetry of the sink run.

Choose the smallest suitable dedicated cabinet after compatibility has been confirmed.

Would a 600mm single Belfast sink work better?

An 800mm double bowl is useful when separate washing and rinsing areas are important, but it takes up more of the cabinet run than a single bowl.

A 600mm single-bowl Belfast sink may be more suitable when:

• The kitchen has a shorter sink run
• Worktop space is limited
• A dishwasher handles most daily washing-up
• One large open bowl is more useful than two smaller bowls
• More space is needed for adjacent drawers or cupboards

The matching single Belfast sink base can create a more compact arrangement, although the sink and cabinet dimensions still need checking.

For a broader comparison, see the guide to double versus single-bowl sinks in real kitchens.

How does a double Belfast sink affect the kitchen layout?

The sink base is wider than the ceramic sink, so the complete 880mm cabinet width must be allowed for in the kitchen plan.

The sink run may also need space for:

• A dishwasher beside the sink
• A waste or recycling cabinet
• Drawer storage for cleaning equipment
• Worktop drainer grooves or a separate drainer
• The tap and any boiling-water equipment
• Pipework, traps and isolation valves

Do not centre the sink visually in the room before checking how the surrounding cabinets work. A small position change may create a better dishwasher route, more useful preparation space or improved drawer access.

What about a drainer?

A ceramic Belfast sink does not normally include an integral draining board. The draining area must therefore be planned separately.

Options include:

• Drainer grooves cut into a suitable worktop
• A removable draining rack
• A separate Belfast worktop drainer
• Using one of the two bowls for rinsing or temporary draining

The chosen solution affects how much clear worktop is needed beside the sink and whether the sink should sit centrally or slightly off-centre within the run.

What should be confirmed before ordering?

Before ordering an 800mm double Belfast sink and its cabinet, confirm:

• The exact sink product and manufacturer
• The actual or stated overall sink width
• The sink depth and front apron profile
• Whether the sink is approximately 220mm or 250mm tall
• That the 880mm cabinet fits the planned kitchen run
• That the cabinet is designed for a sink up to 800mm wide
• The required support and fitting method
• The position of both waste outlets
• The tap position and clearance behind the sink
• The worktop and drainer arrangement
• Whether the physical sink will be available before final fitting or templating

The more detailed guide to Belfast sink base sizes, clearances and drainer options covers the wider sink-run planning process.

Common 800mm Belfast sink planning mistakes

• Buying an 800mm standard cabinet: the internal opening will be narrower than the cabinet’s external width.
• Assuming every 800mm sink is identical: ceramic tolerances and manufacturer designs can alter the fit.
• Ignoring sink height: the cabinet option must suit the height of the apron front.
• Templating too early: the physical sink should ideally be checked before final worktop cuts are confirmed.
• Forgetting double waste pipework: two bowls require enough internal room for the waste kit and plumbing.
• Leaving no tap clearance: the sink depth affects the available worktop behind it.
• Using the 1080mm base without checking: a larger cabinet may waste valuable space if the 880mm base is suitable.
• Comparing only the front appearance: sink support, pipework and service access matter as much as the visible apron.

Final thought

An 800mm double Belfast sink normally works with a purpose-built 880mm double Belfast sink base, not an ordinary 800mm cabinet. The extra cabinet width provides the structure and frame needed around the ceramic sink.

That pairing is still a starting point rather than an automatic guarantee. Confirm the sink’s real width, height, depth and apron profile, allow for ceramic variation and check the complete fitting arrangement before ordering.

View the 800mm double-bowl Belfast sink with the matching 880mm BELFAST 2 sink base, or browse all Belfast and butler sink cabinets.

If you already have a sink specification or kitchen drawing, send the details to Painted Kitchens so the sink and base compatibility can be checked before you order.

800mm Double Belfast Sink FAQs

What size cabinet do I need for an 800mm Belfast sink?

The Painted Kitchens 800mm double-bowl sink is normally paired with the 880mm BELFAST 2 sink base, which is designed for Belfast and butler sinks up to 800mm wide.

Will every 800mm Belfast sink fit an 880mm base?

No. Sink dimensions, apron shapes and ceramic tolerances vary by manufacturer, so the exact sink specification must be checked against the cabinet before ordering.

Why is the cabinet wider than the Belfast sink?

The cabinet width includes its sides, supporting structure and front frame. The sink sits within the opening between these components, so an 800mm sink needs a cabinet wider than 800mm.

When would I need a 1080mm Belfast sink base?

A 1080mm base is intended for larger sinks, including Belfast and butler-style sinks up to approximately 1000mm wide. It should be selected only after checking the chosen sink and kitchen layout.

Should the Belfast sink be available before fitting?

Ideally, yes. Measuring the physical ceramic sink allows the installer to account for dimensional variation and make any final adjustment to the support, frame or worktop.