Thermofoil doors do not fail evenly, and that is the most useful thing about them. In a kitchen built between the early 1990s and the middle of the 2000s, eight doors can look close to new while the ninth, the one to the left of the dishwasher, has a white skin lifting off its edge like a sticker somebody started to pull. The door has not aged. It has been cooked.
Builders in that period hung enormous numbers of these kitchens, and they hung them in sets. Whole streets of tract houses in the Irvine villages that built out across those two decades received the same door profile, the same cup hinge and the same melamine box from the same regional supplier, which is why neighbours compare notes and find they are looking at identical problems in identical places. The question in front of a homeowner is never really whether the kitchen is old. It is which of the failures on display are heat, which are water, and which are the board itself quitting.
Those three causes point to three different projects at three very different costs, so the walkthrough matters more than the quote. Take a flashlight and a screwdriver and look for the specific things below: a bubbled face above the oven, peeling laminate where the edge band has come away from a cabinet box, a sink base floor that gives under a thumb, a drawer bottom with a belly in it. Each one has a cause, and the cause decides the response.
A thermofoil door is wrapped, not painted
Thermofoil is a rigid vinyl film vacuum pressed over a routed medium density fibreboard blank and bonded with adhesive. The film takes the detail of the profile, the adhesive holds it to the core, and the whole thing is sealed at the back by a backer sheet. It was a good answer to a real problem: a smooth, uniform white door with no grain, no panel joint and no brush marks, for a fraction of what a sprayed hardwood door cost.
Its weak point is not the surface. The film itself is tough, cleans easily and does not chip the way paint does. The weak point is the adhesive bond and the exposed core behind it, and both are undone by the same thing, which is heat with moisture in it.
The door beside the dishwasher
This is the single most common failure in the whole category, and it is almost always the same door: the base cabinet immediately adjacent to the dishwasher, on the hinge side nearest the appliance.
Every cycle that machine runs ends with a door opening and a cloud of steam at around the boiling point rolling sideways into the cabinet next to it. The film begins to lift at the nearest vertical edge, then creeps, and once air is under it the bubble grows because the adhesive has nothing left to hold. Look for a seam line standing slightly proud, a soft wrinkle you can push with a fingernail, or a pocket that whitens when you flex it.
It is worth noting what this is not. It is not a sign that the kitchen has reached the end of its life, and it is not a sign that the box behind the door is bad. It is a sign that an appliance has been venting steam at a vinyl wrapped door for fifteen years or more.
The door and panel over the oven
The second predictable casualty sits directly above a wall oven or a slide-in range, and sometimes it is not a door at all but the narrow drawer front or the filler panel above the appliance opening.
Radiant heat escaping the oven door and the vent slot runs up the face of whatever is above it. Thermofoil adhesives soften well below the temperature a self-cleaning cycle puts into that cavity, so the film relaxes, then releases, usually across the bottom edge first and in a line rather than a pocket. A door that has delaminated in a straight band along its lower edge has been told the temperature, not the age.
The white that went yellow
The other complaint is colour. A kitchen that was specified bright white now reads cream, and worse, it reads cream unevenly: the doors nearest the window and nearest the cooking are the furthest gone, while the inside face of the same door is still the original shade.
Ultraviolet light and cooking residue both do this, and vinyl discolours in a way that no cleaning product reverses. The honest test takes ten seconds. Open a door and compare its outer face to its back. If the back is noticeably whiter, the finish has shifted and no amount of scrubbing is going to bring it level.
Edge banding, and the box behind it
Cabinet boxes of this era were white or almond melamine, which is decorative paper fused to a particleboard panel, with a thin band applied to the front edges of the sides and shelves. That band is doing a real job, because it is the only thing covering raw board at the place hands, mops and trolley wheels hit.
When the band lets go it starts at a corner and runs. Underneath is bare particleboard, which drinks whatever reaches it. A band can be reglued or replaced on an otherwise good box, and a case where it has come away from a single shelf edge is a maintenance item rather than a verdict. Peeling across several boxes at the floor line is a different reading, and usually means water has been running along that floor more than once.
A swollen sink base is a plumbing finding
The sink base is where this kind of kitchen dies, and it dies from a leak rather than from the material being cheap.
Open the doors, clear it out and press the cabinet floor hard, near the drain, near the shutoff valves and at the front edge under the bowl. Particleboard that has taken on water swells, and the swelling is permanent because the fibres have expanded rather than flexed. The symptoms are a floor that feels spongy, a surface skin that has bubbled up into low domes, dark staining with a defined tide line, or crumbs of board on your fingers when you rub it.
Then find the source before costing anything, because the repair is pointless without it. The usual culprits are a dripping supply valve, a loose compression nut on the trap, a failed garbage disposal gasket, the dishwasher supply connection, and the sink rim itself where the bead of sealant under the flange has shrunk and let water run down the outside of the bowl. A single leak caught and fixed leaves one ruined cabinet floor, which is replaceable on its own.
The toe kick tells you how long it has been happening
The toe kick is the recessed board at floor level, and it is usually the thinnest, cheapest panel in the room. Run a finger along it in front of the sink and the dishwasher. If it has swollen into a wave, split at the bottom, or lifted away from the floor, water was sitting there repeatedly over a long period, not once last winter. A damaged toe kick with a sound cabinet floor above it often points at the dishwasher rather than the sink.
Hinges, screws and drawers
Soft board stops holding fasteners, and every symptom below is the same fact seen from a different angle.
European cup hinges mount on a plate screwed into the cabinet side. Where the screw hole has worn or the board has gone soft, the plate rocks, the door drops at the outer corner, and no amount of adjustment brings the reveal back. Push up on the door's free corner: if it moves and clicks, the fastening is loose, not the hinge. One or two of these are a straightforward repair, with longer screws, dowels and glue, or a plate relocated to fresh board.
Drawer bottoms in these kitchens are hardboard, sitting in a shallow groove with nothing supporting the middle. Load one with pans and the bottom bellies downward until it pops free of the groove at a corner. A sagging bottom says the drawer was built light, which is true of nearly all of them, and it is fixable inside the existing opening with new drawer boxes on full extension slides.
Four checks that decide whether the boxes are sound
The whole decision turns on the carcasses, and four quick checks settle it.
Screw holding. Back out an existing screw from a hinge plate or a shelf clip and run it back in by hand. If it bites and resists, the board is intact. If it spins loose or the hole weeps dust, that panel is spent.
Square. Measure the two diagonals inside a base cabinet opening. A difference of more than a few millimetres means the box has racked, and doors on a racked box never sit right.
Level and secure. Lay a long level across the tops of the base run, then grip an upper cabinet and pull. Uppers should be screwed through a solid rail into studs, and bases should be screwed to each other and to the wall. Movement here is correctable and must be corrected before any stone goes on.
The back panel. Reach in and tap it. A back that flexes and drums is a thin unsupported sheet, which is normal for the era, and only a problem if the cabinet was hung through it.
The three honest answers
If the carcasses pass those checks and the damage is confined to doors, fronts and colour, refacing is the correct response. New doors and drawer fronts go on, exposed box sides and front edges get a matching finish, new hinges and slides go in, and the layout stays exactly as it is. This is the right call precisely when the failures are heat and ultraviolet failures, because those live on the parts being replaced.
If a leak has taken out the sink base and perhaps the dishwasher end panel while everything else is sound, replace those boxes and only those. A sink base is a simple rectangle and a cabinet shop will build one to match. Fix the plumbing, replace the board, then decide about doors separately.
Full replacement earns its cost in three situations: when the layout itself is wrong for how the household cooks, when water or soft board has reached several boxes rather than one zone, or when the boxes were never square and never secured. Refacing a kitchen you intend to rearrange within a few years is money spent twice.
Read the pattern, not the worst door
One bubbled door beside a dishwasher and a yellowed run under a window describe a kitchen with a surface problem and a working structure. A spongy sink base, a wavy toe kick and three hinges that will not hold describe a kitchen with a water history, and that is a repair before it is a remodel.
Resale pressure complicates the call in neighbourhoods where the comparable sale down the street has already been updated, and a bubbling white door is the first thing a buyer photographs. That is a reason to act, not a reason to skip the diagnosis, because a refaced kitchen on sound boxes presents as well as a new one and a brand new kitchen set on a leaking sink base will be back to the same place in a decade.