A small, third-generation plumbing house. We fix what's broken, replace what's failing, and leave your floors cleaner than we found them — for a written, flat-rate price.
On-call right now
Burst pipes, gushing fittings, sewer backups. We answer at 3 a.m. and roll a truck inside 90 minutes — citywide, every night of the year.
Kitchen, bath, basement. Mechanical augering, hydro-jetting, root cutting, camera inspection — and a written report before any digging is proposed.
Tank & tankless: repair, replacement, conversions, recirc loops. Bradford White, Navien, Rinnai certified. Same-day install on most residential units.
Faucets, toilets, vanities, tubs, dishwashers, disposals — and the supply lines, traps, and shut-offs behind them. We bring the right parts on the truck.
Brownstones, lofts, gut renovations. Copper, PEX-A, cast-iron DWV. We coordinate with your GC and inspector — and we pull our own permits.
Buying a place? We camera the main, pressure-test the supply, and walk every fixture — then write the report your real-estate attorney will actually read.
A human picks up, asks five questions, and books a 2-hour arrival window — usually same-day, often within 90 minutes.
We arrive in shoe covers, lay drop cloths, and walk the issue — supply, drain, vent. Camera the line if it needs it.
One number on the page. You sign it, we do it. If it needs parts we don't have, we go get them — the price doesn't change.
We test it with you, photograph the work, email the receipt, and back parts & labor for two full years.
Project N° 412 · Park Slope
The galvanised supply lines had been on borrowed time for a decade. We replaced every riser in Type-L copper, swapped the cast-iron stack on floors 2–4, set a new mixing valve at the manifold — and reopened the walls the same Friday so the family could move back in for the weekend.
My grandfather opened Mainline in 1998 in a shopfront on 4th Avenue, with a single panel van and a phone number painted on the side. Three of us run it now — same van bay, same painted number — and we still answer it ourselves.
We stay small on purpose. Two trucks, five fitters, one estimator. It means the person who quotes your job is the person who shows up to do it — and that the names on your invoice are people whose kids go to the same schools as yours.
Plumbing is honest work. Done well, it lasts thirty years and you forget about it. That's the bar.
“Called at 11 p.m. on a Sunday — basement was an inch deep. Diego showed up by midnight, fixed the stop, and refused to bill the night rate. They're the plumber you tell your friends about.”
“Got three quotes for the tankless. Mainline wasn't the cheapest, but they were the only one who actually opened the panel before pricing. Five years, zero issues.”
“Repiped our brownstone — five days, on the dot, on the price. Cleanest job site I've ever seen on a renovation. Worth every penny.”
We come out, we look, we tell you. Decide not to do the work and you owe us nothing — not a trip fee, not a callout.
One number, signed before any work starts. If the job grows, we re-quote in writing — we never tack on at the end.
If anything we install fails, we fix it free for two years. Same person, same number, often the same week.
Shoe covers on, drop cloths down. We vacuum every workspace before we go — and show you the receipts on the parts we used.
A real person picks up the phone. Most jobs are booked inside three minutes — and most visits happen the same day.