BUILD-OUT PLUMBING
Commercial build-out plumbing contractor, shell to finished suite
STARTING CONDITIONS
What you inherit decides what the build-out costs
The phrase “build-out” covers three very different starting points. A cold dark shell gives you a slab, a capped sanitary stub and a water service at the demising wall. A white box gives you a finished restroom, a ceiling grid and a distributed water line. Second-generation space gives you someone else’s plumbing, which may or may not suit your use.
Second-generation space is where the estimates go wrong most often. A former restaurant looks like a gift to the next restaurant tenant until the grease interceptor turns out to be undersized for the new menu, the floor sinks are in the wrong places for the new equipment plan, and the water heater is at the end of its life.
We walk the space before pricing, verify what can be reused against current code, and put the demolition and replacement in the estimate as their own lines so you can see exactly what the existing conditions are costing you.
What we verify on the walk
- Sanitary stub location, size and invert depth
- Water service size, meter and available pressure
- Gas meter capacity against the new connected load
- Existing restroom fixture count and accessibility
- Condition and age of any reusable water heating
- Vent penetrations and available roof routes
BUILD-OUT SCOPE
The plumbing work in a commercial build-out
Selective demolition
Cutting out abandoned piping, capping what stays, removing fixtures and interceptors that do not suit the new use, and leaving the slab ready for the new underground layout.
Underground layout and installation
New sanitary and vent set to grade under the slab, tied to the existing stub at the correct invert, with cleanouts placed where they will still be accessible after the walls go up.
Water service and distribution
Extending or upsizing the service, running mains and branches through the suite, isolation valving per area, and insulation on hot and recirculated lines.
Gas distribution
Sizing and running gas from the meter to the equipment, with shutoffs, regulators and a pressure test that satisfies both the inspector and the utility.
Restroom construction
New restroom cores or alterations to existing ones, carriers, fixture setting, accessible clearances and mounting heights, and the drainage and venting behind them.
Testing and closeout
Hydrostatic and air testing, backflow certification, start-up on water heating, as-built markups, warranties and O and M documents at turnover.
SEQUENCE
How a build-out runs from our side
01
Existing-conditions walk
02
Scope split with the landlord
03
Estimate and value engineering
04
Permit submittal
05
Underground before the slab
06
Rough-in through final
COMMON QUESTIONS
Build-out plumbing questions
A cold dark shell is an unimproved suite — slab, exterior walls and capped utility stubs. A white box adds finished floors and walls, a ceiling grid, lighting and usually a code-compliant restroom. Second-generation space is a suite a previous tenant already improved, so you inherit their plumbing along with everything else.
Sometimes, and it is always worth checking. Reuse depends on whether the piping is in serviceable condition, whether it is sized for your fixture count, and whether the layout matches your equipment plan. We test and report rather than assume, because a reused line that fails after the walls close is expensive.
Nearly always for anything producing fats, oils and grease, but the size and the type — interior hydromechanical versus exterior in-ground — depend on the local sanitation district and the equipment list. That determination should be made before the underground layout is set, not after.
Plumbing rarely drives the total duration, but it owns two hard gates: the underground inspection before the slab pour, and the final inspection before occupancy. Missing either one moves the whole schedule.
Yes, and we price it separately so you can see it. On second-generation space the demolition line is often a meaningful part of the number.