Sink CAD block sizes & dimensions explained (free download)

Sinks come in plan and elevation, for different jobs

Sink blocks split cleanly into two views, each with its own use. The plan view — the top-down bowl outline, often set into a counter rectangle — is what you place in a kitchen or bathroom layout to show where the sink sits and how much counter it consumes. The elevation view shows the sink and counter from the front: counter height, bowl depth and the splashback line, which matters for interior elevations and joinery.

The Sinks & Faucets category carries both in quantity. The 500mm sink elevation is a front view labelled by the sink width, while the many "sink plan view" blocks (single, double and triple bowl) are the top-down versions for layouts. As always, match the view to the drawing: a floor plan or kitchen layout needs the plan bowl; a kitchen elevation or bathroom wall elevation needs the front view. The size logic is the same either way — only the geometry differs.

Bathroom basin sizes

Bathroom basins (washbasins) are the smaller sink family, and these are the typical sizes to check a block against:

- Compact / cloakroom basin: 350-450mm wide x 300-350mm deep. - Standard basin: 500-600mm wide x 400-450mm deep — the 500mm sink elevation sits in this range. - Large / double vanity: 1000-1200mm wide for twin bowls. - Basin rim height: about 800-850mm above floor, shown in elevation only.

In plan, a basin reads as the bowl outline within a vanity top or as a pedestal/wall-hung outline. Allow about 600-700mm of clear standing space in front of a basin. If a downloaded basin measures much under 350mm or over 600mm for a single bowl, check the scale before relying on it — a units mismatch is the usual cause.

Kitchen sink sizes — single, double and triple bowl

Kitchen sinks are larger and usually defined by the overall width and the number of bowls, which is exactly how the catalogue labels them:

- Single bowl: about 450-600mm wide, set into the counter. - Double bowl: 800-1000mm wide overall (two bowls, or a bowl plus a half-bowl/drainer). - Triple bowl: 1000-1200mm wide, common in larger kitchens. - Counter depth: 600mm is the standard base-unit and worktop depth; the sink sits within that. - Counter (worktop) height: about 900mm above floor, shown in elevation.

The 1000mm sink plan view blocks (single, double and triple) are drawn into a counter so you can see how much run they consume. When you lay out a kitchen, place the sink first against the window or the plumbing wall, then arrange the hob, fridge and prep space around it — the sink is usually the fixed point the rest of the kitchen works around.

Two details affect how a sink sits in the run. First, a sink should not sit hard in a corner or right against a tall unit — leave at least 100-150mm of worktop between the bowl edge and any return wall or appliance so the tap and your elbows have room. Second, corner kitchens sometimes use a dedicated corner sink that spans the 90-degree junction; if your layout turns a corner at the sink, look for a corner-sink block rather than forcing a straight one into the angle. Getting the sink position right matters more than almost any other kitchen decision, because the plumbing is the hardest thing to move later, so it is worth testing with the real block in the plan.

Downloading and inserting a sink block

Open the Sinks & Faucets category, pick the bowl configuration and view you need, and download the free DWG (no signup; DXF where supported). For a layout, insert the plan block and snap it into the counter run on the plumbing wall. For an elevation, insert the front-view block and sit the counter on a 900mm worktop line (or 800-850mm for a basin).

Units are real-world, so scale 1 in a millimetre drawing, or set INSUNITS / scale by 0.001 in a metre drawing. Verify by dimensioning the overall width — a double-bowl kitchen sink should read about 1000mm. Put the sink on a "Sanitary", "Kitchen" or "Joinery" layer as appropriate; the blocks are built on layer 0, so set the layer current before inserting and the sink inherits it for clean plotting.

Counter, splashback and clearance details

A sink block is most useful when you place it in the context of the counter and the space around it. In plan, leave enough counter on at least one side of a kitchen sink — ideally 600mm — as a landing and prep zone; cramming a sink into a corner with no adjacent worktop makes the kitchen frustrating to use. In a bathroom, centre the basin under a mirror and keep 200mm or so each side to the wall or the next fixture.

In elevation, the sink block lets you set the worktop height (900mm for a kitchen, 800-850mm for a basin) and show the splashback and tap. Drawing it at the real height confirms the relationship to windows, wall units and tiling. As with every fixture, the value of an accurately sized sink block is that it turns a vague "sink goes here" into a tested piece of the layout — counter, clearance and plumbing wall all accounted for.