How to manage the renovation on a flip

How to manage the renovation on a flip is the question that decides whether the deal you modelled actually shows up in your bank account. You can buy well and price the work perfectly, and still hand the margin back if the job drifts, the trades turn up in the wrong order, or the scope quietly creeps while the holding-cost clock keeps ticking. The reno is the one stage where a flip is a project to run, not a spreadsheet to fill in, and running it badly is expensive in a way that buying badly is not always.

This is general information, not building or legal advice, but here is how I think about managing the renovation on a flip once contracts are signed and the keys are in my hand.

To manage the renovation on a flip, first decide who runs the build

Before anything else, be honest about who the builder on this job is. There are really two models.

The first is you hire a licensed builder to run the whole renovation. They coordinate the trades, carry the licence and insurance, and hand you back a finished house. You pay for that in the builder's margin, which on a residential job in Australia typically sits somewhere in the 15% to 30% range over direct costs depending on the size of the job and the builder. On a fast, hands-off flip that margin can be the best money you spend, because a builder who runs a tight site saves you weeks of holding cost and the mistakes that come from learning on your own money.

The second is you run it yourself as an owner-builder, coordinating the trades directly. That is where the margin saving lives, but it is also where the responsibility, the permit and a resale-disclosure rule land on you. Whether you need an owner-builder permit depends on the value of the work: roughly above $10,000 in NSW, $16,000 in VIC and $11,000 in QLD, with an approved course required for larger jobs in NSW and QLD. I cover the licence and resale traps in detail in do you need a licence to flip a house in Australia. Read that before you decide to project-manage a flip yourself, because the decision is not only about who is cheaper.

Most first-time flippers are better off with a builder or a good lead trade running the job, and moving to owner-builder only once they have watched a couple of renos run properly.

Scope the job before anyone swings a hammer

The single most expensive habit in flipping is starting work before the scope is nailed down. A vague brief is an open invoice. Every "while we're here, may as well" is another line the buyer will not pay you back for. Nailing the scope early is also when you find out whether any of it needs a stamp: if you are moving walls or touching the front of an old house, check first whether the reno needs council approval, because an approval you did not budget for is weeks of holding costs before a trade even arrives.

So I write a scope of works before the trades quote: room by room, what is being touched and what is being left alone, down to the finishes. That document does three jobs. It gets you comparable quotes instead of vague ballpark numbers. It becomes the fixed reference when a trade suggests an extra. And it forces you to spend where a buyer actually looks, which on most flips means the kitchen and the bathrooms rather than the parts nobody photographs. If you have not set the reno budget against the resale ceiling yet, the renovations that add the most value and kitchen and bathroom renos for flips are where I would start, and you can price the scope quickly with the renovation cost calculator or the in-app Reno Estimator.

The rule I hold myself to: if a change is not in the scope and does not lift the sale price by more than it costs, it does not happen on a flip.

Line up your trades before you settle, not after

Good trades are booked out. If you wait until you own the house to start calling them, you pay for that gap in holding costs while the site sits empty waiting for a plumber who cannot start for a month.

So the trade hunt starts during the contract period, not after settlement. I want quotes against the written scope, licence and insurance details confirmed, and a rough start window pencilled in before I own the place. On a cosmetic-to-mid flip the trades that set the pace are usually the ones everyone else also wants: a reliable all-rounder or carpenter, a plumber, an electrician, and a tiler. Line those up early and the job flows. Leave them to chance and the timeline is out of your hands from day one.

Keep your trade contacts, quotes and licences in one place rather than scattered across your phone. It sounds trivial until you are running two deals at once, which is exactly what the Black Book in the app is built to hold. Each flip then lives in its own project workspace, so the budget, the schedule and the right contacts stay tied to that job instead of blurring across deals.

Work the order of operations, not the to-do list

A renovation is not a list of jobs, it is a sequence, and getting the sequence wrong is what turns a six-week reno into a ten-week one. Broadly the order runs: strip-out and demolition, then any structural or rough-in work, then the trades that go inside the walls (plumbing rough-in, electrical rough-in), then plaster and render, then flooring and cabinetry, then tiling and wet-area waterproofing, then paint, then fit-off (taps, power points, handles), then the final clean and styling.

The point of respecting that order is that trades depend on each other. A tiler cannot start until waterproofing is done and signed off. A painter does not want to follow the flooring. Book them out of order and someone turns up to a site that is not ready, you lose the slot, and the whole chain slips. I keep a simple week-by-week schedule on the wall and update it the day anything moves, so I can see a slip coming and re-book the next trade before it becomes dead time.

The licensed work you can never DIY

Even if you go owner-builder and swing a hammer yourself, some work is off limits to anyone without the right licence. Across Australia, electrical work, plumbing and gas fitting must be carried out by licensed tradespeople, full stop. Owner-builder status does not change that. The same goes for structural work and asbestos removal.

This is not a technicality to route around. Unlicensed electrical or plumbing work can void your insurance, fail a pre-sale building inspection, and draw a fine, and on a flip it also creates exactly the kind of defect a buyer's inspector loves to find right before settlement. Budget for the licensed trades as a fixed cost of doing business, get the compliance certificates for their work, and keep them, because a buyer's conveyancer may ask.

Hold a real contingency and defend it

No reno runs exactly to plan, so the budget has to carry a contingency, and on a flip that contingency is not spending money, it is protection for your margin. I carry at least 10% on a straightforward cosmetic job and 15% to 20% on anything in an older home where the walls and floors can hide surprises once you open them up.

The discipline is to treat the contingency as an emergency fund for the unavoidable (rot behind the shower, a switchboard that has to be replaced, a subfloor that fails), not a slush fund for nicer finishes. Every dollar you pull from it for a "while we're here" upgrade is a dollar of margin gone if the next surprise is real. Track spend against the scope line by line as you go rather than reconciling at the end, which is what the Budget Tracker is for, so you can see the moment a trade runs over instead of finding out at handover.

The clock is running the whole time

Every week the reno runs, you are paying interest, rates, insurance and utilities on a house that earns you nothing until it sells. That insurance line is its own cover on a renovation, not your old home policy, and whether you need insurance to renovate a house is worth settling before the trades arrive. That is why a well-managed reno beats a cheap one: finishing two weeks early is often worth more than shaving a few hundred dollars off a quote. I put real numbers on this in the six-month holding-cost walkthrough, and you can model your own carry with the holding cost calculator. If you have not mapped the full buy-reno-sell timeline yet, how long it takes to flip a house sets realistic stage lengths.

Managing the renovation on a flip comes down to a few unglamorous habits: decide who runs the build, write the scope before you quote, book trades early, respect the order of works, never cut corners on licensed work, and defend the contingency and the timeline like they are your margin, because they are. Do that and the finished house matches the deal you modelled. Before you buy, run the whole thing as a feasibility first so you know the reno budget the deal can carry, with the full analysis or a worked sample analysis, and the reno is a plan to execute rather than a gamble to survive.