The Hamptons problem
The South Fork is a place that plumbs for August and freezes in February. The Census counts about 60% of the Town of East Hampton’s housing as seasonal or vacant, 49% of Southampton Town’s (2010), 57% of Bridgehampton’s and 60% of Montauk’s, and the Town of Southampton’s housing plan puts Water Mill above 60%; the population of the two towns is roughly a third of its summer peak. Those houses have six baths, a pool house, an outdoor shower, an irrigation system and a guest cottage, on oil or propane more often than gas, on wells as often as on the main, and the design temperature the heating systems are sized to is 15.7°F at Islip and 11.9°F at Westhampton by the ASHRAE 99% figures; Montauk’s own has never been published, and the wind there runs above the rest of the fork all winter. A pipe in a crawl space under a raised house on the ocean side sees all of that, and one insured home in sixty files a water-damage or freezing claim every year, the second most common claim after wind and hail. This guide is the plumbing half of not being that house.
Two choices
Heat it. Leave the thermostat at 55°F or higher, which is the number Travelers publishes for a vacant home and the fact pattern a 2024 New York court case on burst-pipe coverage turned on; the reasonable-care condition in most homeowner policies is heat maintained or the system drained, and insurers have pointed to low utility bills as evidence the heat was off. Then make the house talk: a Wi-Fi freeze or temperature alarm from about $25, a smart shutoff on the main, and someone with a key within an hour. Open the cabinet doors under the sinks so warm air reaches the plumbing, insulate the exposed runs with sleeves or heat tape, shut the interior valves to the outdoor spigots and drain them, let an at-risk faucet drip in a hard freeze, keep the garage door closed. This is how a managed house winters, and a managed house is most of the fork.
Drain it. For a house with no heat, no manager and no plans until May, a plumber closes the main, opens every faucet and the low drains, drains or blows out the supply lines, drains the water heater and turns its power or gas off, empties the traps and fills them with antifreeze, shuts and drains the outdoor shower, the hose bibs, the irrigation and the pool-house and cottage lines, and turns off the well pump or closes the meter. It is a half-day and a checklist, and none of the Hamptons companies we could read publishes a price for it, so we do not invent one. Ask, and ask what the spring reopening costs, because the same company should do both.
The kit
| Item | Cost | What it does |
|---|---|---|
| Wi-Fi freeze / temperature alarm | from about $25; some with a $5–10 monthly subscription, some without | tells you the boiler quit, by app, email or text |
| Smart shutoff, Phyn Plus (2nd gen) | $579.99; plumber installation recommended | senses leaks and freeze conditions and closes the main |
| Moen Flo | not confirmed this session | the other common shutoff |
| Pipe sleeves, heat tape | national guidance; no published price | for the run in the crawl space or the garage |
| A person with a key | — | the alarm is only as good as who answers it |
We could not find an insurer that publishes a discount for a shutoff or an alarm, so we do not claim one. The claim they prevent is the argument.
The outage
Tropical Storm Isaias, August 4, 2020, took out about 645,000 Long Island customers for up to eight days, and the East End’s second-home owners bought remote monitors afterwards. A winter version stops the boiler’s circulator, the well pump and the sump pump at once, which is a freeze in a house on oil or propane and a flood in a basement on the water table. The alarm needs a battery, the shutoff needs one, the pump on a bay-side basement needs one, and the plan needs a name.
What freezes here
The outdoor shower whose shutoff nobody closed. The hose bibs on the north wall. The irrigation backflow left charged. The pool-house bath and the guest cottage on the far end of a long run. The supply line in a crawl space under a raised house on the ocean side, in the wind. The pressure tank and the pump control in an unheated well house. The boiler that quit in an outage with no alarm. Every one is on the drain-down list above, and every one is a call in February.
What it costs to be wrong (2026, national)
| Item | Range |
|---|---|
| Thawing a frozen line | about $100 flat |
| Burst pipe repair | $200–3,000; about $500; labor nearly 80% |
| Emergency call-out / travel / after hours | $100–300 / $50–300 / time-and-a-half to triple |
| Water damage remediation | $1,000–4,000; drywall $250–750 |
| Water heater that ran dry | tank replacement $800–2,500 installed |
| Well pump that froze | $975–2,821; pressure tank $800–3,800 |
| Boiler that quit | repair $200–600; replacement $3,604–8,445 |
No Long Island plumber publishes a rate; these are one national guide’s ranges, and the winter multipliers apply on top.
The reopening
In May the plumber reverses the drain-down: main opened slowly, faucets closed one by one, the water heater filled before it is lit, the well pump and pressure tank checked, the outdoor lines opened, the irrigation backflow tested, and a walk under the house for what the winter did. The reopening is where the winter’s damage is found, and it is the cheapest morning of the year if the November checklist was done.
Sources and method
The seasonal-housing shares are the Town of East Hampton’s Community Housing Fund plan (2020 Census), the Town of Southampton’s demographics appendix (2010) and 2022 housing plan, and Census figures for the hamlets, all via our catering sheet; the design temperatures are ASHRAE’s 2021 99% figures via the NYS Clean Heat calculator guide on our HVAC sheet; the 55°F rule is Travelers’ frozen-pipe guidance and the 2024 New York case on our HVAC sheet; the alarm and shutoff prices are the manufacturers’ pages and our HVAC sheet; the claim statistics are the Insurance Information Institute’s homeowners and winter-storm fact pages; the outage figures are PSEG Long Island’s Isaias reporting on our HVAC and pool sheets; the repair costs are one national cost guide’s 2026 pages, printed as ranges because the other guides blocked every fetch. The full sheet, with every source, confidence rating and named gap, is ops/research/plumbing-facts-2026-08-26.md. Nothing here is a quote; the plumber you hire prices the house.