The order is the content
Almost everything that goes expensively wrong on an owner-managed renovation is a sequencing mistake, not a workmanship one.
Flooring before painting. Cabinets before the floor is level. Drywall before the rough inspection. Worktops ordered before the cabinets are set. Each of those is recoverable, and each costs somewhere between a day and several thousand dollars to recover from.
So the sheet is nine phases in the order they have to happen, and the useful discipline is simply not starting a phase before the one above it has finished.
Where the money actually goes wrong
Contingency. Fifteen to twenty percent on anything built before about 1990. The common advice is ten and the common outcome is going over. It is not padding — it is the wall that turns out to be wet, the framing that is undersized, the drain that was never vented properly.
The moment after demolition. This is when the surprises appear, all at once, and it is the single most important decision point in the job. Stop. Look. Photograph. Reprice.
A job that gets repriced at strip-out usually lands near budget. A job that absorbs the surprises quietly, one at a time, without ever revisiting the number, does not.
Changes. Agree in writing, before the job starts, how a change gets priced — and then actually price each one in writing before it is done. Verbal change orders are the largest single source of renovation disputes, and both parties genuinely remember them differently.
Do everything cheap while the walls are open
The wall cavity is open for about two weeks and then it is closed for twenty years. Everything in this list is nearly free now and expensive later:
- Every outlet and switch you might ever want. Adding a circuit at rough-in costs almost nothing. Adding it afterwards is a day of work plus a wall repair.
- Blocking for anything that will be hung — grab rails, heavy mirrors, wall-mounted televisions, floating shelves.
- Conduit or a pull string to anywhere you might run a cable later.
- Sound insulation between rooms, particularly around bathrooms and any shared wall.
- Photographs of every open cavity. In five years you will want to know where the pipes and cables run before you drill.
The finish order, written out
Ceilings + first coats on walls ← before the floor exists
Flooring
Cabinets and built-ins
Worktops ← templated on the installed cabinets
Tile and splashbacks
Trim, skirting, doors
Final coat of paint ← after the trim
Plumbing fixtures
Electrical plates and fittings
Appliances
Two of these catch people out consistently.
Paint before floor. Painting after the floor goes down means masking an entire finished floor and working slowly to protect it. It produces a worse job for more effort.
Worktops after cabinets. Stone is templated on the cabinets as installed, not from a drawing. Template, then one to two weeks of fabrication. That gap is unavoidable and it sits in the middle of a kitchen job — a kitchen with no worktop and a fridge in the hall. Plan for it rather than discovering it.
Lien waivers
Worth knowing about because it surprises people badly.
In most states, a subcontractor who was not paid can place a lien on your property — even if you paid the main contractor in full for that work. You can pay twice.
The remedy is routine and nobody objects to it: ask for a signed lien waiver from the contractor and each subcontractor with every payment. A professional operation has these ready. A reaction of surprise or reluctance is worth paying attention to.
Living in it
If you are staying in the house, decide in advance where you will cook, wash and store things, and seal the work area properly — plastic across the doorways, a zip door for anything running more than a fortnight, and floor protection on every route the crew walks.
Then cover or seal the HVAC returns in the work area. Renovation dust pulled into a return travels through the entire house and settles in the coil, which is a cleaning bill nobody budgets for. Change every filter in the house when the job finishes.
Reprice at the end of demolition. It is fifteen minutes, it is uncomfortable, and it is the difference between a job that lands near budget and one that does not.