Commercial plumbing covers the water, drain and fixture systems in offices, shops, restaurants, light industrial buildings and multi-unit properties. A leak or backup in a commercial building can close a business for the day, so our 24/7 line takes after-hours calls at night, on weekends and on holidays, with same-day dispatch when schedules allow.
If water is spreading, shut off the main valve and any water heater feeding the affected area, and keep staff and customers away from wet electrical equipment. Then call (603) 815-9179 and tell the dispatcher the building type, the problem and whether a landlord or property manager must authorize work.
We handle repair and installation work for small and mid-size commercial properties. Some jobs, such as large boiler plants, medical gas and fire sprinkler systems, need specialty contractors, and we tell you when that is the case.
After-hours emergencies a business cannot wait out
- A restroom, kitchen or floor drain is overflowing into customer or work areas.
- A supply pipe has burst or a fitting is spraying above a ceiling or equipment.
- The water heater has failed or is leaking in a space that needs hot water to operate.
- A grease line has backed up and the kitchen cannot run.
- A tenant reports water coming through a ceiling from the unit above.
For multi-tenant buildings, tell us who holds the keys and who authorizes the repair. A clear chain of contact saves time at 2 a.m. when a plumber needs to enter an unoccupied suite.
What we handle for commercial properties
| Job | Typical situation | Notes |
|---|---|---|
| Drain and sewer clearing | Restroom, kitchen and floor drains, main line backups | Cable, jetting and camera on site |
| Leak repair and detection | Supply leaks, hidden leaks in ceilings and slabs | See leak detection for the methods we use |
| Water heaters | Tank or tankless units for restrooms, kitchens and break rooms | Repair and replacement |
| Fixture work | Toilets, urinals, sinks, faucets and flush valves | Repair and installation |
| Backflow testing | Assemblies that protect the public water supply | Section below |
| Grease trap cleaning | Restaurants and food service | Section below |
| Storm drain cleaning | Parking lot and roof drains | Section below |
Backflow testing
A backflow preventer stops used or contaminated water from flowing backward into the public supply. Irrigation systems, fire lines and some commercial equipment use them, and they need periodic testing by a certified tester.
Which assemblies need testing, and how often, is set by your water utility and the town. Your water provider and the town's Building and Zoning Enforcement office (603-432-1100, extension 440) can tell you what applies to your property before you book. We schedule these as planned visits and not as emergencies.
Grease traps and kitchen drains
A grease trap catches fats and oils before they reach the sewer. When it fills, the kitchen drains slow, the trap smells and grease can carry into the building line, which is a common cause of a restaurant shutdown.
We clean grease traps on a schedule that matches the kitchen's volume and clear the lines when a trap has overflowed. A regular cleaning costs less than an emergency, and a clear record helps if a sewer authority asks about it.
Storm drains and parking lot drainage
Roof drains, catch basins and trench drains collect leaves, silt and trash. When they clog, water pools in a lot or runs toward a doorway. We clear them with cable and jet equipment and camera the line when the same basin keeps filling.
A storm drain that discharges to a town system or a wetland falls under rules that vary by site. Ask the town before you flush anything unusual into it.
An honest note on commercial leak detection
Leak surveys on large buildings are different from a house visit. A fire line, a multi-building loop or a long underground main can take hours to isolate, and the answer is sometimes that the leak is in a part of the system we do not service.
We are direct about what we can find and when a specialty contractor is the better fit. Describe the building and the symptom first, and we will tell you whether a survey is realistic before anyone drives out.
Commercial space across Londonderry
Londonderry includes the Woodmont Commons mixed-use development and commercial space on the side of town near Manchester-Boston Regional Airport. Older buildings and new ones fail in different ways, and we ask about the building's age and piping before we arrive.
We also serve businesses in Manchester, Derry and Hudson. If your issue is a failed heater, see our water heater replacement page.
What commercial plumbing costs
Business calls are quoted before work starts, with after-hours labor stated plainly. Cost depends on:
- The size and type of the system, such as a single restroom or a multi-tenant stack.
- Access, including ceilings, shafts and after-hours building entry.
- Whether specialized equipment such as a jetter or a camera is needed.
- Parts availability for commercial fixtures and heaters.
- Emergency dispatch outside business hours.
Commercial property policies vary widely. Ask your agent whether they cover sudden water damage and business interruption. For a quote on your building, call (603) 815-9179.
Commercial fixture counts, backflow protection and pipe sizing are set by the International Plumbing Code (IPC) in the State Building Code, and your building's use decides which sections apply.
Questions we hear in Londonderry
Yes, businesses can call (603) 815-9179 after closing. Name the building type and the problem, and the dispatcher books a plumber, same day when the schedule allows.
Yes, including drain clearing and grease trap cleaning. Tell us about the kitchen and the trap size when you call.
Yes, if the landlord or manager authorizes the work. Give us a contact who can approve it, so a night visit is not delayed.
A certified tester must do it. Ask your water utility what applies to your property, and we can schedule the visit.
We refer large boiler plants, medical gas and fire sprinkler systems to specialty contractors, and we tell you when a job falls into that group.
Yes. We clear catch basins and roof drains with cable and jetting equipment and camera the line when a drain keeps backing up.