South Shore DEMPSEY'S PLUMBING (555) 240-1188
Serving the South Shore

Plumbing Done Right, With the Price Agreed Before We Start.

A family shop out of Lindenhurst, running since 1999. Licensed, insured, and clear about the number before anyone picks up a wrench.

  • 4.8 from 512 reviews
  • Licensed master plumber
  • Answered at 2am
Plumbers in navy work shirts standing in front of two white service vans outside the shop
The vans and part of the crew outside the shop in Lindenhurst.
  • 26yrs

    On the South Shore since 1999

  • 11,200+

    Houses we have worked inside

  • 4.8

    Across 512 verified reviews

  • 75min

    Typical emergency arrival

Who turns up

The Same Four Faces, on Every Single Visit.

A small crew on purpose. You get a text with the name and the face of whoever is driving to you.

Portrait of the founder, a silver-haired plumber, in the shop store room

Walt Dempsey

Founder, master plumber

On the tools since 1994

Walt served his time in an Amityville shop, spent a decade on somebody else's payroll, then bought a van and a phone line. He is still out on calls most of the week and has met more bad pipe than anybody on this shore.

Portrait of the scheduling manager in the shop store room

Brian Dempsey

Scheduling & estimates

On the tools since 2009

Walt's son, and the reason the van shows up when we said it would. Brian prices the renovation work, plans the week and deals with anything the town wants on paper first.

Portrait of the senior service technician with folded arms in the shop store room

Hector Alvarez

Senior service tech

On the tools since 2012

Hector covers most of the out-of-hours work and turns up leaks that have already beaten two other outfits. He would rather walk you to the fault with a torch than describe it in the driveway.

Portrait of the office manager in the shop store room

Carol Dempsey

Runs the office

Answering the phone since 1999

First ring, every time, and she is the one who ranks the day. Nine calls out of ten she knows from your opening sentence whether a van goes out tonight or Thursday morning.

Three plumbers at the open rear doors of a service van in a driveway at dusk
Why they call back

Quiet, Careful, and Finished When We Said.

The habits have not changed in twenty-six years. Turn up inside the window, show you the problem, invoice the figure we quoted. It is not clever. It is just rare.

  • One crew from start to finish
  • Written price at the door
  • Floors covered, debris hauled out
More about the shop

Five Hundred South Shore Homeowners Later.

4.8 average from 512 reviews
“Tank quit on a Sunday afternoon with a full house. Hector had a heater on the van and was here in two hours, and the figure he wrote at the door is the figure I paid.”
Rosa T. Lindenhurst · Water heater swap
“Two outfits told me the whole sewer run had to come out. Walt put a camera down, showed me the screen, and it was one bad joint. Targeted dig, a third of the money.”
Ed K. Copiague · Sewer line repair
“Two floods in three years before we rang them. New pit, proper pump, backup battery, and they re-graded the bed outside that two other firms walked straight past. Bone dry since.”
Nina B. Massapequa Park · Basement water
“Brian took the plumbing end of a kitchen rebuild and hit every date he gave our builder. He also caught an old galvanised run behind the plaster before it became our problem.”
Owen R. Bellmore · Kitchen rough-in
“Our kitchen line closed up twice a year and everybody just cabled it. These people jetted it, dropped a camera down, found a sagging section and told us what to do about it.”
Gail P. Islip · Drain jetting
“Split pipe at eleven on a February night. Carol answered on the second ring, talked me through shutting the water off, and a van was outside inside the hour.”
Frank G. Babylon · Emergency call
“They moved us off oil and onto gas and dealt with every bit of the town paperwork. The cellar was tidier when they left than when they arrived, which I did not expect.”
Lucia M. Brentwood · Gas piping
How it goes

What Actually Happens After You Call the Shop.

The part homeowners dread is not the plumbing itself, it is not knowing what the job will cost or who is going to turn up. So here is the whole sequence, in order.

  1. Somebody Here Picks Up The Phone

    Carol or Brian answers. Tell us what you are seeing, hearing or smelling and you get a straight view on whether a van goes out today.

  2. We Work Out What Has Actually Failed

    A camera, a gauge, a torch, whatever the job needs. Nothing gets priced until we can say out loud what has failed and why it failed.

  3. You Approve One Fixed Number

    One figure, handed over at the door before a tool leaves the van. Find something hidden in a wall and we halt, show you, and re-quote there.

  4. The Job Gets Done And Tidied

    Dust sheets first, and whatever we take out goes away in the van. Permit jobs are filed by us, and one of us stands with the inspector.

  5. The Rest Gets Checked For Free

    Valves, pressure, the heater, any pipework we can see. You get told exactly what we found, and none of it turns into a sales call later.

Out of Lindenhurst, covering western Suffolk and the south half of Nassau.
Where we go

From Valley Stream Out to Medford.

Four vans out of one shop, so nobody is dispatching you from two counties west. Anywhere on the list below normally sees somebody inside the hour.

Western Suffolk

LindenhurstCopiagueAmityvilleBabylonIslipBrentwoodCentral IslipRonkonkomaHolbrookMedfordKings ParkHauppauge

South Nassau

Massapequa ParkBellmoreFreeportBaldwinOceansideValley StreamEast MeadowWestburyMineolaLong BeachHempsteadFranklin Square

Town missing from the list? Send it over and we will say yes more often than not.

Coverage map
Licensed and on the road

Want Someone There This Afternoon?

Call the shop and you get one of us, not a call centre. Average arrival across western Suffolk runs about seventy-five minutes.

Common questions

Answers to the Six We Hear Weekly.

If yours is missing, phone it in. We would rather talk it through than send a van you did not need.

Call (555) 240-1188

Planned work is quoted at no charge: a heater changeout, a bathroom rough-in, a line renewal. Where a fault has to be traced before anybody can price it there is a call-out charge, and that gets credited against the repair once you give us the work.

Across western Suffolk and the south of Nassau the average is about seventy-five minutes on a live leak or a cold house. If every van is committed Carol will tell you that on the phone instead of booking you a slot she cannot keep.

A master plumber licence for the county we work in, plus liability and workers' compensation cover and a bond. Copies travel with the first quote. This site is a demonstration, so no real licence numbers are printed anywhere on it.

Western Suffolk and the southern half of Nassau, worked out of the Lindenhurst shop. Anything between Valley Stream and Medford sits inside the normal run; further east depends on what the day looks like.

We do. Heaters, gas runs, sewer work and anything structural go in front of the town, and one of us is there for the inspection. Nobody enjoys that part, but unpermitted gas work turns into a problem the day you sell.

A flat figure, written down, approved by you before anything starts. You are not paying by the hour while somebody drives to the supply house, and the invoice carries the number you agreed to.

Often, yes. On a renovation we will take the plumbing package and fit around whatever programme the builder is running, or we will price the wet side of the job and hold our own dates. Either way one of us is there on inspection day.

Fast estimate

Describe the Problem, Get a Real Number.

Every message gets an answer from a plumber inside one working day. Some jobs have to be looked at before anybody can price them, and we would rather tell you that than invent a figure.

Demo form, nothing is sent anywhere.

Thanks. In the live version this lands with the office and a plumber replies inside one working day.

Licensed, insured, and stocked from suppliers we trust

Northridge

Northridge Supply

Fixtures and parts counter

Vantage

Vantage Heating

Certified tank and tankless

Ironclad

Ironclad Tools

What rides on every van

SSTB

South Shore Trade Bureau

Rated member since 2006

Sentinel

Sentinel Mutual

Bonded and fully insured

GasCheck

GasCheck Registered

Gas fitting and testing

Harborline

Harborline Fittings

Copper, brass and PEX

Every Visit Ends With a Free Look Over the Rest.

On the way out somebody checks the valves, the pressure, the heater and the pipework on show, then tells you where it all stands. None of it becomes a sales call. Half the emergencies we attend were obvious and cheap a season earlier.

See the process