Most finishing work we are called in to repair wasn’t ruined by bad materials. It was ruined by decisions taken in the wrong order, or by steps skipped to save a week. They hide for months until a ceiling stains or a tile cracks, and then fixing them means breaking finished work. Here are the seven we see most often, and what to do instead.
01Skipping waterproofing, or doing half of it
Waterproofing is the first item cut when the budget tightens, because once tiled, nobody sees it. Bathrooms, kitchens, balconies and roofs all need it, and each gets skipped with an excuse like “it’s only a balcony”.
Tiles and grout are not a waterproof layer. Water finds the joints, soaks the bed beneath and appears weeks later as a stain on the neighbour’s ceiling or damp at the foot of your walls. Then the only real fix is lifting the floor.
- Waterproof every wet-area floor and turn the membrane up the walls, higher around the shower.
- Seal around every drain and pipe that passes through the slab.
- Flood-test before tiling: fill the area with water, leave it a day or more, and check below for leaks.
02Choosing tiles before the lighting and electrical plan
Owners naturally start with what shows: they pick tiles in the showroom, then ask the electrician to “fit the points around them”. The result: a socket cut through a cladding slab, downlights out of line with the floor pattern, a gypsum ceiling dropped lower to hide a duct.
The lighting plan decides where ceilings drop, where walls are chased and where cladding needs cut-outs. Fix it first, on paper, room by room: lights, switches, sockets, TV, data and AC points. Then choose finishes that suit it, and judge glossy tiles under lighting like yours, not the showroom’s.
Buy all your tiles in one order, from one production batch, and check the shade and size codes on every box at delivery. Keep a few spare boxes: when a tile cracks years later, an exact match is hard to find.
03Closing walls before pressure-testing the plumbing
A slow leak from a bad joint can take months to show, and when it does, finding it means breaking tiles or a ceiling, sometimes your neighbour’s.
Before any wall is plastered or floor screeded, pressure-test every supply line: fill it above working pressure, seal it, and watch the gauge long enough to reveal even a small drop. Run water through the drains to confirm the falls. Then photograph each pipe route with a tape measure in the frame, so nobody drills into it later.
04Too few sockets, too few circuits, no spare conduits
Many homes we revisit share one complaint: extension leads everywhere. Sockets followed the furniture drawing, not daily life, and every new appliance loads circuits never sized for it. Overloaded circuits trip, cables run hot, and adding a point later means chasing a painted wall.
Plan sockets around real use: both sides of the bed, the kitchen counter, the TV wall, the balcony. Put AC units, the oven and the water heater on their own circuits. And lay a few empty spare conduits to the main rooms. They cost little now and save breaking walls later.
05Wrong floor levels and slopes in wet areas
Water goes where the floor sends it. If a bathroom or balcony screed slopes the wrong way, or not at all, water pools, reaches the threshold and runs into the next room. Once it is tiled, the only cure is breaking it out.
Agree finished floor levels for the whole unit before screeding, with wet areas slightly lower than the rooms around them. Check the fall to every drain at screed stage, then pour a bucket of water before tiling. It takes five minutes.
06Painting over plaster that hasn’t dried
The programme slips, the handover date doesn’t, and the painter starts on walls that are still damp. It looks fine on the day. Weeks later the paint blisters, peels or goes patchy, especially near bathrooms and on exposed walls, and has to be scraped back.
Fresh plaster needs drying time, which varies with thickness, season and ventilation. Keep windows open, check walls with a moisture meter, not by touch, and use the primer or sealer the paint system specifies. If time is tight, shorten another task, not the drying.
07Paying before you inspect
Many owners pay by the calendar, or whenever the contractor asks, and inspect only at the end. By then every mistake above is buried under another layer, and the money that gave you leverage is spent.
Link every payment to an inspected stage: pipes pressure-tested, electrical first fix checked against the plan, wet areas flood-tested, screed levels confirmed, plaster dry before paint. Keep a written snag list at each stage and close it before the next payment.
| Mistake | Cheap to fix | Costly to fix |
|---|---|---|
| Weak waterproofing | Before tiling, with a flood test | After a leak shows below |
| Finishes before the lighting plan | On paper, before first fix | After ceilings and cladding close |
| Untested plumbing | During the pressure test | Behind finished tiles |
| Too few sockets and circuits | During electrical first fix | After painting |
| Wrong floor slopes | At screed stage | After tiling |
| Paint on damp plaster | Before priming | After the paint blisters |
None of these shortcuts saves money; they only move the cost to later, usually with interest. Planning a finishing project? Talk to our team about doing it in the right order.
