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New Construction Plumbing Services in South Shore, MA
Expert plumbing contractors for residential and commercial new construction projects
Professional New Construction Plumbing
Expert Commercial & Residential New Construction Plumbing
Complete New Construction Plumbing Solutions
Commercial New Construction
- Office buildings
- Retail spaces
- Restaurants
- Multi-family units
- Industrial facilities
Residential New Construction
- Single-family homes
- Custom builds
- Townhouses
- Condominiums
- Additions & extensions
Comprehensive Plumbing Systems
- Water supply lines
- Drain, waste, vent systems
- Gas line installation
- Fixture installation
- Code compliance
Project Management
- Blueprint reading
- Coordination with GCs
- Permit acquisition
- Inspections
- Final walk-throughs
What we do on new construction and remodels
On a new build, an addition, or a gutted kitchen or bathroom, Johnson Bros. installs the plumbing in two passes: the rough-in while the framing is open, and the fixture set once the walls and floors are finished, with the inspection between them.
Rough-in: drain, waste and vent
The drain, waste and vent system goes in first because it is the part that cannot be moved later. Every fixture gets a trap, a drain sized for what it carries, and a vent that runs to the roof or ties into a vent stack, so the traps hold water and the drains do not gurgle. On a multi-story build the stacks are set before the branch lines; on a remodel the existing stack decides where the new fixtures can go. The system is capped and filled or air-tested for the inspector.
Rough-in: water supply
Hot and cold supply is run to every fixture location with shutoffs where they will be reachable, sized so that running a shower and a washing machine at once does not starve either. Where the house will have a tank or tankless water heater, its location, venting and recirculation are planned at this stage, not after the drywall. Supply lines are pressure-tested before they are closed in.
Gas piping
In Massachusetts gas fitting is part of the plumbing license, so the same Master Plumber license we work under, PL #17034-M, covers gas line and gas appliance work. The gas line for the range, the dryer, the boiler or water heater, and any outdoor grill or fireplace is sized for the total load, run during the rough-in, and tested before the walls close. The gas line page covers the same work on an existing house.
Fixture set and final testing
Once tile, cabinets and flooring are in, we return to set the toilets, faucets, tubs, showers, sinks and appliances, connect the water heater and any gas appliances, and run every fixture to check for leaks, drainage and pressure. That is the point at which the plumbing becomes the homeowner's, and the same kind of everyday work covered on the general plumbing page takes over from there.
Our New Construction Process
Design & Planning
Blueprint review and system design
Rough-In
Install water, drain, and gas lines
Inspection
Code compliance verification
Finish Work
Fixture installation and testing
How we work with general contractors and homeowners
With a general contractor, we work from the plans and the construction schedule and report to the GC; with a homeowner running their own remodel, we take the role of walking the space, writing the scope, and telling you what the other trades need to leave for us.
With a GC or builder
We read the plumbing sheets, flag anything that will not pass or will not fit before the framing goes up, and give a written scope and price from the drawings. Rough-in is scheduled around framing and before insulation; fixture set is scheduled after finishes. Changes on site are explained to the GC before they become extra work, so the schedule and the price stay the ones everyone agreed to.
With a homeowner
Most homeowner projects are a kitchen or a bathroom, sometimes an addition. We walk the space with you, say what can go where given the existing stack and supply, and write a scope you can hand to the carpenter and the tile installer. If you want a price before anyone comes out, send photos of the space and the existing plumbing through the free photo and video review and we will tell you what we can see and what we need to measure.
Permits and inspections in Massachusetts
On our Massachusetts jobs, the plumbing and gas work on a new build or remodel is done under a permit and looked at by the town's plumbing and gas inspector at the rough-in stage and again at the finish; we help manage that permit and inspection process so the work stays aligned with the code and the project schedule.
The sequence. The permit is filed with the town before work starts, under the license of the plumber doing the work. The rough inspection happens with the drain, vent, supply and gas lines installed and under test but still exposed, before insulation and drywall. The finish inspection happens after fixture set, with everything connected and running. A job that skips the rough inspection has to be opened back up, which is why the schedule is built around it.
What the inspector checks. Pipe sizing and materials, trap and vent arrangement, slope on the drains, support and protection of the piping, the test on the drain and supply systems, and the gas test. On the finish, fixture clearances, backflow protection where required, and that every fixture drains and holds pressure.
Who deals with the town. We do, for the plumbing and gas permit on our scope. The building permit, and the electrical and other trade permits, belong to the GC or the respective trade. Which town's inspector you get depends on the address; we work in 31 South Shore towns and know the local offices.
Why Choose Johnson Bros. for New Construction?
Licensed Master Plumbers
Fully licensed, insured Massachusetts plumbing contractors on every new build
Code Experts
Deep knowledge of Massachusetts plumbing codes and permit requirements
On-Time, On-Budget
Reliable scheduling and transparent pricing for GCs and builders
Quality Materials
We use only premium materials from trusted manufacturers
Rough to Final
Underground and rough-in through trim, fixtures, and final inspection sign-off
Proven Track Record
Strong reputation for residential and commercial new construction work across the South Shore
New construction plumbing questions
Scope, coordination, permits, and pricing.
Do you work on residential and commercial new construction projects?
Can you coordinate with my general contractor or builder?
What parts of the project do you handle?
Do you pull permits and handle inspections?
Can the same company run the gas line for the range, dryer and boiler?
I am remodeling one bathroom, not building a house. Is this the right page?
How is a new construction job priced?
Start Your New Construction Project with Confidence
Call South Shore's trusted new construction plumbing contractor
Why Choose Johnson Bros?
Serving Quincy, Abington, and the South Shore. We'll review your request and confirm the next available appointment.
17+ Years Experience
Family-owned since 2008, serving Massachusetts families with pride
Licensed & Insured
MA License PL #17034-M, fully licensed and insured
Upfront Pricing
No hidden fees - price approved before work begins
4.8 stars on Google
418 verified Google reviews from South Shore neighbors
Expert Technicians
All technicians are licensed, trained, and background-checked
1-Year Warranty
Our work is warrantied for one year on parts and labor. Equipment carries its manufacturer's warranty on top of that, six years on the tank of a standard water heater for example.
Ready to Experience the Johnson Bros Difference?
Call or book online and we'll confirm the next available appointment.