Measure a bay-window recess before extending kitchen storage into it

Measure a bay-window recess as a changing outline. Its central depth does not establish how far a rectangular cabinet or storage unit can extend into it. Draw the angled returns, identify a fixed line across the opening and record perpendicular depths at the actual edges of the proposed footprint. Then check the complete shape at the intended height. A deep central point can coexist with side corners that block the unit.

Establish a baseline across the opening

Choose identifiable endpoints across the room-side opening and record them on the plan. This baseline is a reference for locating the recess, not necessarily the future counter edge. Map each change of direction in the finished boundary behind it. Include projecting trim or a sill if it occupies the proposed space. Do not assume the bay is symmetrical merely because its center window looks balanced in a photograph.

IKEA’s window survey includes frame, sill and operating-space measurements. The bay profile here is an editorial method for applying those separate boundaries to an irregular footprint.

Reading note: IKEA US: Kitchen measurement services — window geometry and operation.

Measure at the proposed footprint edges

Record perpendicular depths from the baseline to the boundary at the center and at the left and right limits of the intended cabinet or storage unit. The side positions matter: moving an edge toward an angled return can reduce available depth. Label the measuring stations instead of listing disconnected lengths. If the proposed unit changes width or position, its side checks must be updated as well.

Repeat the relevant outline at the height being considered. A sill can project farther than the wall below it, while a window control or moving sash can occupy space above the surface. A plan taken at floor level does not automatically describe the countertop or upper storage zone. Keep those outlines distinct, with their reference heights, until the proposed assembly can be compared with all of them.

ABCD

A

Left station at the proposed footprint edge.

B

Central depth of the recess.

C

Right station at the proposed footprint edge.

D

Common opening baseline; not a specified counter edge.

Test the side corners, not only the center

In a hypothetical example, depth behind the opening baseline is 20 inches at the center and 10 inches at each proposed side station. A rectangular storage footprint extending 18 inches behind that line would leave 2 inches at the center but exceed the side depth by 8 inches. The rectangle therefore does not fit the stated footprint. These are assumed teaching dimensions; the diagram illustrates the same relative depth relationship without specifying a product, window angle or installation detail.

Now reverse the question: how much width is available where the proposed back edge would sit? In an angled bay, the opening width and the width deeper inside are different. Mark that rear line on the profile and compare the full assembly width, including separately required side pieces. This catches a unit that passes the front opening but runs into the angled returns farther back. Do not interpret passage through the opening as proof that the complete footprint fits.

Choose a layout response to the actual outline

A shallower or narrower approved storage unit, a different position or leaving part of the recess open may be more useful than trying to occupy every corner. Compare the storage that remains with the reach needed to use it. A deep surface behind a sink can become difficult to reach even if it fits geometrically. Any surface spanning the recess also needs its actual support and fabrication requirements resolved separately; the plan outline alone does not establish them.

Hand over a profile, not a guessed template

Provide the baseline endpoints, corner locations, station depths, reference heights and photographs of the trim and controls. Show the proposed rectangular footprint on the same plan and identify concealed sections. Keep the final field verification and any fabrication template as separate deliverables; a homeowner’s planning sketch is not a cut-ready shape. The designer can then compare usable arrangements before cabinet selection, while the finish reference below remains a visual aid only.