A farmhouse sink (apron-front sink) sits with its front face exposed instead of behind a cabinet door — a signature feature of country, modern, and transitional kitchen designs. The install differs from a standard undermount or drop-in sink: cabinet must be modified to support the sink's weight (60-150 lbs for stone or fireclay), the sink's apron front is the visible face (no cabinet door in front), and plumbing connections must accommodate the sink's deeper basin.

This guide covers a typical 30 inch farmhouse sink in a 33 inch sink-base cabinet — the most common configuration.

Before you start

Three things to settle:

1. Cabinet must support sink weight. Farmhouse sinks (especially stone or fireclay) weigh 80-150 lbs filled with water. Cabinet base must include reinforced support — typically 2x4 framing under the sink. Standard sink-base cabinets need modification to support farmhouse sink. Plan ahead.

2. Cabinet door is replaced with apron front. Farmhouse sink's front face replaces what would be a cabinet door. Standard sink-base has a cabinet door — for farmhouse, that's removed or never installed. Visually verify before committing.

3. Match countertop install timing. Stone/quartz countertop fabrication needs the sink's exact dimensions. Farmhouse sink dimensions vary by manufacturer — provide exact dimensions to fabricator. Sink installs first, countertop fits around it.

What you'll need

Tools

Drill with bits and driver
Jigsaw
Tape measure
Level
Pencil
Adjustable wrench
Caulk gun

Materials

Farmhouse sink (30 inch typical)
Sink mounting brackets (manufacturer-specific or generic)
2×4 lumber (for cabinet reinforcement)
3-inch construction screws
Construction adhesive
Faucet (matching sink — typically wall-mount or deck-mount)
Drain assembly (matched to sink)
Plumber's tape and pipe sealant
100% silicone caulk

Add 2×4 framing to support the sink's weight

Run 2×4 cleats horizontally across the inside of the cabinet, supported by the cabinet sides.

Sink rests on this framing.

Without this support, sink slowly sags — eventually pulling cabinet apart.

Step-by-step instructions

Measure cabinet and sink dimensions

Cabinet interior width vs sink width (typically 30 inch sink in 33 inch cabinet).

Sink depth vs cabinet depth.

Verify sink fits in cabinet with 1.5-2 inch margin on each side.

Modify cabinet for farmhouse sink

Remove cabinet door if present.

Cut cabinet face frame at top (where countertop will sit) so sink's apron sticks through.

Verify sink dry-fits with apron protruding through the front of the cabinet.

Add 2×4 support framing

2×4 lumber: install horizontally across the inside of the cabinet, ~6-8 inches below the cabinet top edge.

Multiple cleats (2-3 typically) to distribute sink weight.

Anchor cleats to cabinet sides with construction screws + adhesive.

Verify framing is level and square — sink will rest on it.

Lower sink into cabinet

Heavy sink — two people lift.

Lower sink into cabinet, apron protruding through cabinet face.

Sink rests on the 2×4 cleats inside cabinet.

Verify sink is level and aligned — apron centered on cabinet face.

Install sink mounting brackets

Most sinks have mounting brackets for additional stability.

Brackets between cabinet and sink underside; tighten to pull sink tight against support framing.

Manufacturer-specific.

Install faucet

Decide: wall-mount above sink (more design flexibility, requires wall plumbing rough-in) or deck-mount (typical, mounts to countertop).

Faucet install per manufacturer instructions.

Apply plumber's tape on threads.

Install drain assembly

Drop-in drain flange with putty around the perimeter.

Tighten drain locking nut from below.

Connect P-trap and tailpiece.

Verify drain alignment with cabinet/floor plumbing.

Connect water supply and waste

Hot and cold supply lines from shut-off valves to faucet.

Drain pipe from sink to wall plumbing via P-trap.

Hand-tight, then 1/4 turn with wrench.

Don't over-tighten.

Coordinate countertop install

Countertop fabricator templates after sink is in.

Counter sits on cabinet edge AND on top of sink's flat back rim.

Caulk between countertop and sink rim with 100% silicone.

Test for leaks

Open shut-off valves slowly.

Run water hot, cold, both.

Fill sink, check P-trap.

Check supply lines, drain connections, faucet base.

24-hour leak check.

Common mistakes that cost you

No 2×4 framing in cabinet. Sink sags over time, cabinet fails. Always reinforce.
Sink not aligned with cabinet face. Visible misalignment from kitchen. Verify alignment in dry-fit.
Wrong sink size for cabinet. Doesn't fit or overhangs. Verify before purchase.
Skipping countertop coordination. Countertop edge gaps or doesn't fit sink. Provide exact dimensions.
Wrong faucet for sink type. Wall-mount faucet on flat-back sink: doesn't work. Match faucet to sink type.

Frequently asked questions

What size cabinet do I need for a farmhouse sink?

30 inch sink: 33-36 inch cabinet.

33 inch sink: 36 inch cabinet.

Add 3-6 inches to sink width for cabinet allowance.

Verify on manufacturer's spec sheet.

Single bowl or double bowl?

Single: more space for large pots, simpler look.

Double: separate wash and rinse zones.

Common for farmhouse: single bowl due to deep basin design.

What material is best?

Stainless steel: durable, modern, lighter (60-80 lbs).

Fireclay: traditional white finish, durable, heavy (80-120 lbs).

Stone composite: premium, very durable.

Match material to kitchen aesthetic.

When to call us instead

Farmhouse sinks are signature features in custom kitchens. Our team handles cabinet modifications, sink install, and plumbing as part of kitchen renovations.

Book a free 60-minute site visit →

Related Ottawa services

If you're planning a kitchen with a farmhouse sink, our kitchen renovation team handles the install. Book a free 60-minute consultation.