New Construction Plumbing in Georgia

New construction plumbing is the full set of water, drain, waste and vent piping put into a new house or addition, built in stages that follow the rest of the construction. Unlike a repair, most of it ends up hidden in slabs, walls and ceilings, so the decisions made early and the tests made before each stage is covered matter more than anything visible at the end.

Decisions to make before the first trench

The layout starts from the house plan and a fixture list. A few choices then shape the rest of the system. The water heater type, whether gas, electric or tankless, affects venting, gas piping, electrical circuits and where the unit can sit. A public sewer or a septic system decides where the building drain leaves the house and how deep it runs. A bathroom below the level of the sewer usually needs an ejector pump, covered under sump and sewer pump service.

How the work is staged

  1. Underground. Drain lines beneath the slab or in the crawlspace are laid at the correct slope, along with any water lines below the slab, and tested before concrete or backfill covers them.
  2. Rough-in. Once framing is up, drain, waste and vent piping and the hot and cold supply lines are run to every fixture location. Plumbing tends to go in early because drain lines need a set slope and are the hardest to reroute.
  3. Top-out. Vents are carried through the roof, tub and shower valves are set, and the supply piping is pressure tested before insulation and drywall go up.
  4. Trim and final. After finishes, the fixtures, faucets, water heater and appliance connections are installed, the system is filled and checked for leaks, and a final check follows.

Inspections and testing

Typical checkpoints are the underground work before it is covered, the rough-in before walls close, and a final once fixtures are set. Keeping the work exposed until each stage has been tested and checked avoids cutting into finished surfaces later.

Working alongside the builder

Plumbing on a new build depends on timing. The plumber needs the slab layout before forms go in, framing that leaves room for drain stacks and vent runs, and a sequence with the HVAC and electrical crews so that ducts and wiring do not land where a drain has to pass. Fixture selections should be settled before rough-in, because a freestanding tub or a wall-hung toilet needs different rough-in dimensions than a standard one.

Additions and major remodels

An addition ties new piping into an existing system, so part of the job is checking what is already there. A camera look at the existing sewer, a pressure reading and a check of the water heater’s capacity help assess whether the old system can carry the new fixtures; a camera shows visible condition, not capacity. Sometimes the answer is a larger water service line or replacing a tired section of sewer before the addition is connected.

Reading a new construction bid

A new construction bid should follow the plans: fixture count and locations, pipe materials for supply and drain, the water heater type, any gas piping, and the stages included. It should say which tests and checks are in the price, how retesting is handled, what the plumber needs from the builder at each stage, and where the plumbing scope stops, for example at the meter or at the sewer tap. Fixtures supplied by the owner or builder should be listed as such.

New construction plumbing by city

Each city link opens the local overview for new builds and additions.

Questions about new construction plumbing

When should a plumber be involved in a new build?

Before the foundation is formed. Underground drain lines are placed before a slab is poured, so the plumbing layout has to be settled while the house is still on paper. Bringing the plumber in at the planning stage also helps with water heater placement, venting routes and making sure the framing leaves room for drain stacks, all of which are harder to change once construction is underway.

What does a basement bathroom need if it sits below the sewer line?

If the fixtures are lower than the building sewer, gravity alone cannot carry waste out, so the bathroom drains into a sealed basin with a sewage ejector pump that lifts it up to the sewer. The basin is normally vented and fitted with a check valve, a high-water alarm and a lid that stays accessible for service, with the details set by the pump manufacturer’s instructions. Planning it during rough-in is far simpler than adding it after the floor is finished.

What gets tested before the walls are closed?

The plumber tests drain, waste, vent and supply piping using methods suited to the installed materials and the manufacturer’s instructions. Do not assume compressed air is suitable: manufacturers of PVC, CPVC and ABS systems may expressly prohibit it. These tests happen before insulation and drywall hide the pipes, and the rough-in is checked at this point. A leaking joint caught now is a small fix; caught after the drywall goes up, it means opening finished walls.

Planning a build or an addition

Share the plans or describe the project, and we will talk through layout, staging and testing with you. Call (404) 409-4448 or start with the request form.