New Construction Plumbing Rough-In, Explained for Calgary Builds
What rough-in covers, why sequencing matters, and how it decides whether the finish goes smoothly.
Short answer: Rough-in is the plumbing that goes inside the walls and floors before drywall: every water supply line, every drain and waste line, the vent stacks, and the gas lines for any gas appliance. It is set precisely to where the fixtures will land later and has to pass inspection before insulation goes in. Accuracy here decides how the whole finish goes.
On a build, the plumber is on the critical path more than once. Here is what each stage covers and what a builder should expect.
The plumbing stages of a build
| Stage | When | What happens |
|---|---|---|
| Underground | Before the basement slab is poured | Drains under the slab, floor drains, sump and any future bathroom rough-in, then inspection |
| Rough-in | After framing, before insulation | Supply lines, drains, vents and stacks run to every fixture location |
| Gas rough-in | With or just after plumbing rough-in | Gas lines to the furnace, water heater, range, fireplace and BBQ |
| Inspection | Before insulation and drywall | The City inspects plumbing and gas before anything is covered |
| Finish | After drywall, tile and cabinets | Fixtures set, appliances connected, system tested |
Why sequencing matters
A build runs on order. Framing has to be done before rough-in starts, rough-in has to pass inspection before insulation goes in, and every trade behind the plumber waits if the plumber does not show. Rough-in is not a step to rush, and it is not a step to be late for.
What does a good rough-in look like?
- Built to current Calgary code so it passes inspection the first time it is called.
- Set from the actual fixture specs, not standard dimensions. Wall-hung toilets need carriers, freestanding tubs need fillers placed to the inch, and shower valves have specific depths.
- Coordinated with framing, HVAC and electrical so drains, ducts and wiring are not fighting for the same joist bay.
- Conflicts flagged in week one, not after the drywall is hung: a joist where a flange lands, a beam in a drain path, a vent with nowhere to go.
- Photographed before close-up, so the builder and the owner know what is behind the walls.
Permits on Calgary builds
On infill builds, the City of Calgary's single construction permit covers the plumbing and gas work inside the building envelope. Gas, secondary gas lines, hydronics and suites all come with their own inspection steps, and gas appliance vents need side yard clearance before they can terminate there. The plumbing contractor should own the plumbing and gas side of that, including booking inspections and clearing any deficiencies.
What helps the plumber keep the schedule
- Drawings and fixture selections early
- A heads-up when framing or the schedule moves
- One decision-maker for changes on site
- Clear access and somewhere to stage material
Common questions
How long does plumbing rough-in take on a new house?
It depends on the size of the house and the number of fixtures. On a typical custom home it is a matter of days, not weeks, once framing is ready.
What is the difference between rough-in and finish plumbing?
Rough-in is everything inside the walls and floors before they close. Finish is setting and connecting the fixtures and appliances after the walls, tile and cabinets are done.
Who books the plumbing inspection?
The licensed plumbing contractor doing the work should book it and be available when the inspector arrives.
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