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A sink base looks almost identical to a standard base cabinet from the front, but the interior is deliberately left more open — the bottom shelf area needs to clear a sink bowl and drain plumbing, so a full shelf there is unlikely to be useful and is treated as optional in this plan. What isn't optional is keeping the outside dimensions and face-frame reveal identical to the rest of your base-cabinet run, so the counter line and toe-kick stay continuous once everything is installed.
The back panel gets a genuine exception here: it's fine to skip it entirely to leave room for supply lines and a drain trap, but the plan still calls for adding small strips of 1/4" plywood at the top and bottom of the back opening. That's not decorative — it brings the cabinet's back edge out 1/4" to match the depth of the neighboring cabinets that do have full backs, so the counter overhang stays consistent across the whole run even where this one cabinet is open behind.
| Item | Qty |
|---|---|
| Plywood, 3/4", 4x8 sheetSides, bottom shelf, and supports. | 1 each |
| Plywood, 3/4", cheaper grade, 4x8 sheetBottom supports. | 1 each |
| Plywood, 1/4", 4x8 sheetOptional back — can be omitted entirely for plumbing clearance, keeping only small strips top and bottom. | 1 each |
| Pine, 1x2, 8 ft | 1 each |
| Pine, 1x3, 3 ftCenter stile. | 1 each |
| Pocket hole screws, 1-1/4" | 1 box |
| Finish nails, 3/4" | 1 box |
| Cabinet door, full overlay | 2 each |
| Drawer face | 1 each |
| Concealed euro hinges, 1-1/4" overlay | 2 pair |
Overall cost: $$$. Lumber prices vary by region, species, and season, so we give a band rather than a figure we would only be pretending to know.
| Part | Qty | T × W × L |
|---|---|---|
| Side panelsPlywood | 2 | 3/4" × 22 1/4" × 34 1/2" |
| Bottom shelfPlywood | 1 | 3/4" × 22 1/4" × 34" |
| Bottom supportsPlywood, cheaper grade | 2 | 3/4" × 5" × 34" |
| Top supportsPlywood | 2 | 3/4" × 3 1/2" × 34" |
| Back (optional)Plywood | 1 | 1/4" × 32" × 35 1/2" |
| Face frame side stilesPine | 2 | 3/4" × 1 1/2" × 27" |
| Face frame top/bottom railsPine | 2 | 3/4" × 1 1/2" × 36" |
| Face frame drawer railPine | 1 | 3/4" × 1 1/2" × 33" |
| Face frame center stilePine | 1 | 3/4" × 2 1/2" × 21" |
| Interior shelf (optional)PlywoodUnlikely to be useful on a sink base — the sink bowl and plumbing generally need this space clear. | 1 | 3/4" × 22" × 27 3/4" |
Buy 9 boards at 8 ft.
2 boards
1 board
1 board
1 board
1 board
2 boards
1 board
Assumes 8 ft stock, a 1/8" saw kerf, and buying each part at its own width. Change the board size or kerf on the full board plan →
Build the two side panels as true mirror images of each other, matching the outside dimensions of every other base cabinet in your run.
Attach the two bottom-support strips to the two side panels.
Attach the bottom shelf to the two bottom supports and one side panel, then attach the remaining side panel to complete the base.
Attach the top supports across the front and back of the carcass.
Attach the back panel with 3/4" finish nails and glue. On a sink base, the back can be left off entirely to leave room for supply lines and a drain trap — if you do, still add small strips of 1/4" plywood at the top and bottom of the opening, which brings the cabinet's back edge out 1/4" to match cabinets with full backs.
Build the face frame separately, then attach the completed frame to the front of the cabinet. Sides overextend by 1/4" on each side; the top is flush; the bottom is flush at the sides with the bottom shelf set up 1/2".
Install the two full-overlay doors and the drawer front using concealed euro hinges with a 1-1/4" overlay.
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