What Is Rough-In? (A Homeowner's Guide)

Rough-in is the phase of construction where the underlying systems of your home plumbing, electrical, and HVAC are installed inside walls, floors, and ceilings before those surfaces are closed with drywall or tile. It is called rough-in because the work at this stage is not finished. Pipes are run but fixtures are not connected. Wires are pulled but outlets and switches are not yet installed. The rough-in creates the infrastructure that everything else builds on.

At Phoenix Home Remodeling, rough-in is one of the most closely managed phases of every project because mistakes made here are the most expensive to fix later. Every rough-in on our projects is inspected and approved before we close the walls.

Because once the walls are closed, you cannot see what is inside them. If a pipe is run in the wrong location, if an electrical circuit is undersized, or if a vent is blocked by a structural member, you will not find out until something fails or you try to add a fixture that does not work. Fixing rough-in problems after drywall means tearing out finished surfaces, which is expensive and disruptive.

Rough-in is also the phase that requires building inspections in most jurisdictions. Work that is done incorrectly and closed over without inspection can create code violations that surface when you try to sell your home or pull a permit for a future project.

Rough-in scope varies by project but typically includes:

• Plumbing rough-in: Supply lines and drain lines are run to the locations where sinks, showers, tubs, and toilets will be installed. Locations are set based on the final fixture plan.

• Electrical rough-in: Circuits are run from the panel to the locations of outlets, switches, lighting, appliances, and exhaust fans. Any new circuits required by code like dedicated circuits for dishwashers or microwaves are added at this stage.

• HVAC rough-in: Duct runs and registers are positioned for proper airflow to the remodeled space. In bathroom remodels, exhaust ventilation is added or upgraded.

• Low-voltage rough-in: Speaker wire, data lines, and other low-voltage runs are installed if specified in the scope.

Yes, in most jurisdictions plumbing and electrical rough-in must be performed by licensed tradespeople and inspected by the building department before walls are closed. This is not optional and is not something a general handyman can legally perform on a permitted project.

Yes, but it costs money and time. Moving a drain location after the slab has been cut or moving an electrical panel after rough-in is approved requires rework that is almost always the result of a change order. This is one of the reasons a detailed scope of work and final selections before construction begins are so important they prevent rough-in locations from being set in the wrong place.

• Who is performing the plumbing and electrical rough-in, licensed subs or your own crew?

• Will rough-in be inspected and signed off before walls are closed?

• Have the rough-in locations been set based on the final fixture and appliance selections?

• What happens if the inspector requires changes after rough-in?

See also: Construction Sequencing, Building Permit, Subcontractor, Scope of Work, Change Order