TENANT IMPROVEMENT PLUMBING
Tenant improvement plumbing contractor for commercial build-outs
WHAT WE OWN ON A TI
The plumbing scope on a tenant improvement, start to finish
A tenant improvement is a remodel inside a building that is already standing, and that changes what the plumbing work actually is. You are tying new sanitary, vent, water and gas into a base building someone else designed, often with an occupied suite on the other side of the wall and a landlord work letter that says exactly what you may touch.
We take that scope end to end: reading the base-building conditions, laying out the underground against the fixture and equipment plan, coordinating the ceiling with mechanical and electrical, setting the rough-in, trimming out the fixtures, and carrying the permit and inspection sequence through to final sign-off.
The work we do before anything is trenched is what keeps the job on schedule. Fixture counts, restroom accessibility, grease requirements, water heater sizing and gas load all get confirmed against the drawings first, because every one of them can change the underground layout — and the underground gates the slab pour.
What comes with the contract
- Site walk of the existing suite and base-building points of connection
- Line-item estimate with allowances called out separately
- Permit-ready drawings, isometrics and fixture-unit calculations
- Long-lead equipment released off preliminary drawings
- Full inspection schedule, underground through final
- As-builts, warranties and closeout documents at turnover
SCOPE OF WORK
What a TI plumbing contractor is responsible for
Underground sanitary and vent
Saw-cutting, trenching and setting sanitary and vent piping to grade under the slab, then backfill, test and patch ahead of the pour. The layout is driven by the fixture and equipment plan, so it gets confirmed before anyone breaks concrete.
Domestic water distribution
Hot and cold water mains, branch runs, recirculation, isolation valving and insulation, tied into the base-building point of connection with the right pressure and sizing for the new fixture count.
Natural gas piping
Gas service extension, sizing for the connected load, shutoffs, regulators and connections for water heaters, rooftop units and kitchen equipment, pressure-tested and inspected.
Water heating
Tank, tankless and mixing-valve assemblies sized to the fixture load, with the seismic, venting, combustion-air and drain-pan requirements your jurisdiction applies.
Fixtures, trim and ADA
Setting and trimming water closets, lavatories, sinks, carriers, mop basins and drinking fountains, with mounting heights and clearances that pass an accessibility inspection the first time.
Permits and inspections
Plan submittal, response to plan-review comments, and the inspection sequence from underground and rough-in through final — tied to the certificate of occupancy date.
HOW THE JOB RUNS
The order the work goes in
01
Walk the space and verify the base building
02
Price the scope line by line
03
Permit and long leads in parallel
04
Underground, test, pour
05
Rough-in and close the walls
06
Trim, start-up and final
COMMON QUESTIONS
Tenant improvement plumbing questions
At space planning, before the layout is locked. Fixture locations, restroom accessibility and any food-service equipment drive the underground, and the underground drives the slab pour. Catching a problem at that stage is a line item; catching it at rough-in is a change order and a schedule hit.
Both. On most build-outs we hold a subcontract under the general contractor and run inside their schedule and billing process. On smaller or owner-managed projects we contract directly with the tenant or the building owner.
Yes. We install from a design team’s plumbing construction documents, and we can also provide design-build plumbing — isometrics, fixture schedules and sizing — under one contract with the installation.
Three things: an underground layout that changes after the fixture plan moves, a long-lead item ordered too late, and a failed inspection that has to be re-scheduled. All three are avoidable with an early walk and an early release of the long leads.
Often, yes. The work letter defines what the base building provides and what the tenant pays for — the water service, the sanitary stub, the gas meter, sometimes the restrooms. We read it before pricing so the estimate matches what you are actually responsible for.