Making the Appliances Fit

Measure the appliance you are actually buying

What they search at midnight “my fridge doesn’t fit the cabinet opening” — almost always because someone planned around a category instead of a model.

“A 30-inch range” and “a 36-inch fridge” are shorthand, not measurements. Real appliances arrive at 29⅞″, or 35¾″ plus a hinge that needs another inch, or with a handle that sticks 2½″ proud of the door. Every manufacturer publishes an installation or “will it fit” sheet with the exact opening they require — width, height, depth, and the air gaps around it. Download it, print it, and plan from that page.

If you have not chosen the appliances yet, plan the standard openings below, and keep your shortlist to models that fit them. That is the whole reason those sizes are standard.

The opening, the air, and the door that has to open

Three separate things have to be right, and people usually only check the first.

• The hole. Plan 36″ wide and 70–72″ high for a standard full-size fridge. That is the space between the cabinet sides and under the cabinet above — not the fridge’s own dimensions.
• The air. A fridge is a heat pump and it has to breathe: roughly ½–⅝″ each side, about 1″ on top, and 2″ behind for the cord and the coils. Built-in and integrated models are the exception — they are designed to be squeezed in with an eighth of an inch, because their venting comes out the front.
• The swing. This is the one that gets missed. A fridge door usually has to open past 90° — often closer to 115° — before the interior drawers will pull out. Push a fridge tight against a side wall or a tall pantry and the crisper is trapped forever.

Counter-depth or standard? A counter-depth fridge has a box around 24–25″ deep, so it sits nearly flush with your cabinets and reads as built-in — you pay for that in cubic feet. A standard-depth fridge needs about 30″+ and will stand proud of the run by 5–6″. Neither is wrong; just decide before you buy the countertop, because a protruding fridge changes how the whole side of the kitchen looks.

The cabinet above. Over a fridge you want a short wall cabinet — typically 12″, 15″ or 18″ high. If you want the fridge to look built in, order that cabinet in a deeper 24″ box so its face lines up with the fridge instead of hovering a foot behind it. That single upgrade does more for a “custom” look than almost anything else on this page.

30 inches, an anti-tip bracket, and nothing flammable overhead

A freestanding or slide-in range drops into a 30″ gap in the base run — leave the opening at a true 30″, because ranges are built a whisker under. A slide-in model overlaps the countertop at the front edge for a seamless look and needs the counter cut accordingly; a freestanding model has finished sides and a back guard and simply slots in.

What can sit above it. Building codes give combustible material — which means your cabinet — a vertical clearance of 30″ above the cooking surface. You may come down to 24″ only where the underside of that cabinet is protected (classically ¼″ insulating millboard covered in sheet metal), and an over-the-range microwave or a listed hood is engineered and certified to sit closer. Do not put a plain wooden cabinet 20″ over a burner because it looked good in a photo.

Drop-in cooktops are a different animal: the appliance sits in the countertop, so what matters is the cut-out (always smaller than the overall appliance) and what is directly underneath. Most cooktops need clearance below for their body and controls, which usually rules out a full drawer stack in that cabinet — check the spec sheet before you order a three-drawer base for that spot.

Height, width, and whether it actually vents anywhere

What they search at midnight “how high should a range hood be” — higher than you think for gas, lower than you think for electric.

• Height. 24–30″ above a gas cooktop, 20–24″ above electric or induction, measured from the cooking surface to the bottom of the hood. Too low is a fire and head-clearance problem; too high and it simply stops catching the plume.
• Width. Match the cooktop as a minimum. If the wall allows, going 3″ wider on each side captures far more of what comes off the front burners.
• Airflow. A common rule of thumb is about 100 CFM per linear foot of cooktop for electric, and for gas roughly 1 CFM per 100 BTU of total burner output. A 60,000 BTU range wants around 600 CFM.
• Ducting. Straight and short beats big and twisty — every elbow costs you. Keep the duct the full size the hood specifies, never reduce it, and vent outside, not into the attic.

Ducted or recirculating? Ducted is genuinely better: grease, steam and smells leave the building. Recirculating (a charcoal filter that blows back into the room) is what you use when there is no realistic path outside — an interior wall in a condo, for example. It handles smoke and some odour, and does nothing at all about humidity. If you can duct, duct. And note that very high-CFM hoods can need make-up air to avoid back-drafting other gas appliances; that is a conversation with your inspector, not a DIY guess.

Over the range, in a cabinet, or in a drawer

An over-the-range (OTR) microwave is a hood and a microwave in one box. It hangs from the wall behind it and from the bottom of the cabinet above, so you must have a cabinet above it — usually a short 12–18″ one. Manufacturers typically call for the top of the microwave at least 66″ off the floor, which leaves roughly 13″ between the cooktop and the underside of the unit; always follow the paper template that comes in the box, because the mounting plate and the exhaust knock-out are model specific.

Its exhaust can usually be configured three ways — out the back, up through the cabinet, or recirculating — and you set that inside the unit at install time. Decide which one before you cut anything.

The honest trade-off: an OTR microwave is compact and cheap, but it is a mediocre hood and it puts a hot dish at eye level over a hot burner. If the budget stretches, a microwave drawer in a base cabinet or a microwave in a tall cabinet frees the wall for a real hood and is far kinder to short cooks. Whatever you choose, a built-in microwave needs its own trim kit and its own ventilation gaps — you cannot just slide a countertop model into a cabinet hole.

Never drill into the stone

What they search at midnight “how to secure a dishwasher to a quartz countertop” — you don’t. You fasten it to the cabinets beside it.

A dishwasher sits in a 24″ gap in the base run, under a counter at the standard 34½″ box height, and it does not need a cabinet of its own — the two cabinets either side are the enclosure. Its own legs adjust so the top of the machine tucks under the countertop.

The one thing that catches everybody: the brackets on top of the machine are meant to screw up into a wooden countertop. With quartz, granite or any stone, doing that means drilling into the underside of a slab that is not yours to gamble with — and stone chips. Instead:

• Use the side-mount holes. Most modern dishwashers have brackets that turn 90° or holes in the sides near the top; they screw sideways into the cabinet side panels.
• Retrofit if it is top-mount only. A cheap side-mount conversion bracket screws to the machine and gives you a side tab. Every appliance parts counter stocks them.
• Short screws only. A cabinet side is ¾″ thick. Use the screws in the bag, not the longest thing in your box, or you will drive a point through the inside of your neighbour’s cabinet.
• High-loop the drain hose up under the countertop before it goes to the disposal or the trap — that is what keeps sink water out of your clean dishes, and it is what an inspector looks for.

If the dishwasher lands at the end of a run, it needs a finished end panel beside it — there is no cabinet there to hide the gap and to screw into. And a panel-ready dishwasher takes a door in your kitchen’s own finish, ordered with the cabinets; you cannot decide that afterwards.

The sink base is measured by the bowl, not the sink

A 30″ sink base takes most single bowls; a 36″ base is the safe home for a large single or a double. What matters is not the sink’s outside dimension but the bowl: it has to clear the cabinet sides, and on a frameless cabinet you have the full internal width to play with. Add an inch of margin and you will never regret it.

The sink base is also where the plumbing lives, so it has no drawer and usually a removable or notched back for the trap and the supply lines. Cut those holes on site, once the cabinet is standing in place and you can see exactly where the pipes come out of the wall — measure from the finished floor and the cabinet side, drill a small pilot, and open it up with a hole saw. Cut generously; nobody will ever see the back of that cabinet.

What has to be on the wall before a single box goes up

Everything an appliance drinks, burns or plugs into has to be roughed in before the cabinets cover the wall, and it has to land where a cabinet is not.

• The fridge outlet goes high on the wall inside the fridge opening, where the fridge cannot crush the plug.
• The dishwasher is normally fed from the outlet in the sink base, with its own shut-off valve reachable without dismantling anything.
• A gas range needs its shut-off accessible — do not entomb it behind a fixed panel.
• Countertop outlets are governed by spacing rules in your electrical code, and they are cheaper to add now than to chase later.
• Floor vents and returns hidden by a base cabinet: relocate the duct, or fit a toe-kick grille — decide at planning, not on install day.

None of this changes the cabinet work, but all of it changes where the cabinets can go. Mark every service on your wall elevation before you order, and the install becomes carpentry instead of improvisation. Gas, pressurised water and 240-volt circuits stay with the licensed trades — that is the deal that keeps the rest of the job yours.