Sequencing a residential build in Victoria

A house is not built. It is released, one hold point at a time. The drawing set is a hypothesis about order. The site tests that order against clay, rain, a surveyor's diary and the plasterer already promised to three other jobs. This is the construction problem in Victoria: not whether the rooms are handsome, but whether the work can be done in a sequence the permit, the ground and the trades will accept.

Clients arrive with a calendar that starts at "start" and ends at "move in". The middle is demolition or site prep, excavation, a slab or stumps, frame, lock-up, fix, services, wet trades, and a handover that is a legal event as much as a set of keys. Skip a week in that chain and you do not lose a week. You lose the people booked to meet it.

What the sequence is actually for

Sequence is how you keep water out of timber, steel out of mud, and uncertified work from being covered. In Victoria the relevant building surveyor writes hold points onto the building permit. A competent builder writes a few more. Reconcile those lists before the first machine arrives, not over a half-poured edge beam. The useful question at every stage is not "are we finished?" It is "what must be true before the next trade can start without undoing this one?"

A programme is a set of promises made to other people's calendars. Break one date and you have not slipped. You have spent someone else's winter.

Demolition and prep

Protection works before the bucket

On a vacant lot the first fortnight is fences, sediment control, a temporary crossover if the council will have it, and proving where the services actually run. On a knockdown-rebuild add a demolition permit, an asbestos assessment if the house is old enough, and a decision about what stays in the ground. Stumps, old footings and a septic tank have a habit of appearing as if they had been waiting.

Protection works sit beside demolition more often than clients expect. If you are excavating near a boundary, or building a wall that could affect the neighbour's footings, the Building Act process is a hold point of its own. Book the demolition contractor against the end of that process, not the start. Prep is also the last cheap moment to move a crossover, raise a site shed off the wet side of the block, or put the spoil pile where it will not become a dam in July.

Excavation

Excavation is the first day the job tells the truth. Bulk cut on Melbourne clay is a moisture exercise, not a volume one. Open the pad, leave it, and a week of rain will turn a classified site into a different one. If you flood the pad and scrape it "clean", you have changed the assumption the engineer designed to.

On reactive clay the window is short. See wet weather, clay soils and the Melbourne build calendar for why a western-suburbs pad in August is a different job from the same pad in March. Do not open more ground than you can protect or pour. If the pour is not booked, keep the last 100 millimetres of cut in the ground. Services are not a surprise if someone has dialled and then proved the plan on site. They are a surprise if the only document is a ten-year-old drainage plan and optimism.

Slab or stumps

Victoria still builds both, and the sequence after them is not the same. A waffle raft wants dry access, steel inspection, a pour that is not a swimming pool, and a curing period the framer will try to steal. Stumps and bearers want set-out that survives the first wet week, a termite system installed as specified, and a subfloor that remains inspectable. Do not treat "slab or stumps" as a taste question. It is a programme question and a moisture question.

Book the steel fixer and the pump against a forecast. If the steel is not right that morning, you do not pour in the afternoon and "sort it later". The cost of a cancelled pour is never just the fee. It is the framer who takes another job. On a stump job the equivalent sin is setting out off a fence that is not on title. Pay for a licensed surveyor. It is cheaper than moving a house.

Frame

Frame is the first week the building has a silhouette, which is why clients visit. It is also the week you find out whether the set-out, the slab set-downs and the window schedule were the same document. They often were not.

A Victorian frame inspection is a hold point. Bracing, tie-downs, point loads and the ugly garage junctions are what the surveyor came to see. Sheet nothing that hides a hold-down until that inspection is released.

Book the roofer against frame complete, not against frame start. A roof that arrives while the last trusses are still being stood will sit on the nature strip and then be late for the next job. The window supplier wants a measure after frame, not from the drawing, unless you have already agreed a supply-only risk you can live with. Measure twice if the openings were adjusted on site, which they will have been.

Lock-up

Lock-up is the moment the building can keep weather and thieves out. It is also the moment the interior sequence becomes possible. Roof, wrap, windows, exterior doors, and enough temporary power to run more than a radio. Until those things are true, plaster, joinery and floor finishes are a fantasy.

Clients treat lock-up as a celebration. Builders treat it as the first day they can defend the programme against Melbourne. A house that is not locked up in May will take the winter on the chin. Do not confuse lock-up with "we are nearly finished". You are about halfway through the money and less than halfway through the decisions — wet-area set-outs, joinery, appliance clearances — that generate variations because nobody wanted them while the slab was being poured.

Fix, services and the wet trades

First fix is the humble work that later looks like competence: plumbing rough-in, electrical and data, any hydronic or mechanical duct that cannot be invented after plaster. The walls are still open. That is the point. Once they are closed, every change is a hole and an argument.

Services coordination is not a meeting. It is a set of marked-up drawings and a walk-through before insulation. If the rangehood duct and the downlight and the beam want the same 200 millimetres, one of them will lose. Better that it lose on a red pen than in a ceiling cavity in week thirty.

Wet trades — waterproofing, tiling, the remaining plumbing fit-off that depends on both — sit on the critical path more often than the frame does, because there are fewer good ones and they do not wait for you. Waterproofing in particular is a hold point on any serious job, whether or not the surveyor named it. Do not tile over a membrane you have not tested, photographed and, where required, had inspected.

Second fix and paint want clean, dry, lockable rooms and a decision freeze. If the client is still choosing tapware while the tiler is on the wall, you are not in a finish stage. You are in a redesign with a tiler standing there.

Handover is a document

Handover in Victoria is not a feeling. It is an occupancy permit, certificates, a defects list specific enough to be useful, and keys that should not be handed over because someone is tired. Manuals, warranties, the termite certificate, glazing, waterproofing — these are the building's memory, not souvenirs. Walk every door, tap, switch and waste, and the things that fail after the photographer has gone: overflow relief, condensate, subfloor access, isolation valves. Write defects in the room, with a date.

Weather, inspections, and when to book the trades

The three things that actually run a Victorian house are weather, the surveyor's diary, and lead times. Everything else is commentary.

You cannot schedule sunshine. You can schedule float. Put weather days into excavation, pour, frame and roof, and treat them as spent until they are not. The surveyor is not your employee: book them when the stage is ready, early in the day, so a fail does not consume the pour. If you have a superintendent running a site meeting that is worth the hour, those dates belong on the agenda as facts.

Trades third. Book in this order, and book earlier than feels polite:

• Demolition and asbestos, against permit and protection-works close-out
• Excavator and geotechnical inspection, against a dry window
• Steel, pump and surveyor, as one cluster
• Framer, then roofer, then windows — never as a single optimistic date
• Services first fix, against a closed roof
• Plaster, waterproofing and tile, against a lock-up that has already happened
• Joinery measure after plaster, not from the drawing if the walls have moved
• Painter last among the wet trades, and only once the tiler is gone

The people who keep a house on time are not the ones who start early. They are the ones who refuse to start a stage that will have to be done again. Sequence is a form of thrift. It is also the only way a drawing becomes a building that the permit, the ground and the winter will allow to stand.