New York · Plunge & Small Pool Builders · Updated 2026
A real pool in a small yard: 5 plunge pool builders serving Islip, ranked by rating and review count, with what a plunge or cocktail pool costs installed in Islip this year.
Ordered by customer rating and review count across the Islip area. Listings include the available rating, contact details and location; confirm current credentials and scope directly.
Companies in the second group install fiberglass pools; most manufacturers offer plunge and cocktail shells — ask which small models they carry and whether they build custom gunite plunges too.
Planning a new pool as well? The Islip pool builders directory ranks all 170 builders in the area.
Installed in Islip, a fiberglass plunge pool typically runs $45,500–$78,000 and a custom gunite plunge or spool $65,000–$117,000 — the small footprint saves on excavation and finish, but the equipment pad costs about the same as a full-size pool:
| Job | Typical Islip price |
|---|---|
| Precast concrete plunge pool, installed | $39,000–$71,500 |
| Fiberglass plunge pool, installed | $45,500–$78,000 |
| Custom gunite plunge pool | $65,000–$117,000 |
| Spool (spa + pool) with jets and heater | $78,000–$143,000 |
| Heater (year-round use) | $3,900–$10,400 |
| Chiller (cold plunge) | $5,200–$11,700 |
| Swim jets or resistance current | $6,500–$15,500 |
| Decking and coping | $5,000–$15,500 |
| Permits and inspections | $700–$3,900 |
New York pricing is above the national baseline used for these estimates, mainly on labor and permitting. A plunge pool is not half the price of a full pool — the pump, filter, heater, electrical and permits are the same — but it fits where nothing else will and costs far less to heat and maintain.
A heater on a 4,000-gallon pool costs little to run — it is the difference between a plunge pool used eight months a year and one used eight weeks.
4.9 stars from 109 reviews
View Company →Islip market
4.6 average customer rating · 1090 reviews · 5 companies · 2 specialists
See All on the Map →5 plunge pool builders serving Islip. 2 are listed as specialists for this work; the rest are fiberglass pool installers that routinely handle it. The ranked companies average 4.6 stars across 1,090 customer reviews. PoolPad orders the list with a weighted score that combines customer rating and review count, so a long track record counts for more than a handful of scores.
Vinyl liner rules on value across upstate and much of Long Island; gunite owns the high end from Westchester to the East End. Automatic safety covers are widespread, salt systems keep growing, and compact heated plunge pools are the new city-adjacent trend. Smaller lots and higher construction costs have made plunge pools, cocktail pools and spools the fastest-growing pool type — a heated 8×16 pool costs a fraction to run and fits a courtyard.
For statewide rankings, city counts and New York prices, see the New York plunge pool builders directory, or check the nearby cities below.
Measure the access route first — a crane over the house changes the budget. Decide on heat, jets and a bench up front, since they drive the equipment. Then compare a fiberglass model against a custom gunite price for the same footprint. New York has no single statewide contractor license — licensing runs by county and city (Nassau, Suffolk, Westchester, and NYC all license home improvement contractors), so verify locally. Statewide, new pools must meet the residential code's barrier requirements and include a pool alarm; towns layer their own fence and setback rules on top.
Installed in Islip, NY, a fiberglass plunge pool typically runs $45,500–$78,000, a precast concrete plunge $39,000–$71,500 and a custom gunite plunge $65,000–$117,000. A spool with jets and a heater runs $78,000–$143,000. Decking adds $5,000–$15,500 and a heater $3,900–$10,400. New York pricing is above the national baseline used for these estimates, mainly on labor and permitting.
Most are 7 to 10 feet wide, 12 to 20 feet long and 4 to 6 feet deep with a flat floor — about 2,000 to 6,000 gallons versus 15,000 to 25,000 for a typical family pool. Cocktail pools add benches and a tanning shelf; spools are often 8×14 to 10×20 with spa jets.
You can cool off, float, soak and exercise in place; laps need a swim-jet or resistance-current system, which many plunge and spool builders install. For actual lap swimming a narrow lap pool of 30 feet or more is the better fit.
Much cheaper: a third or less of the water means a smaller pump, far less chemical use and a heater that brings the pool to temperature in an hour or two. Many owners here keep a plunge pool heated through the shoulder seasons and close it only in deep winter.
The outdoor season in Islip runs Memorial Day through mid-September — about 4 months unheated. A full professional winterization each fall protects plumbing and equipment through the freeze, and spring openings cluster into the same few weeks. The realistic unheated season is Memorial Day to mid-September — heaters are less a luxury than the price of using what you built. Winters are long and freezing, so a professional close is standard everywhere in the state.
JAS Aquatics | Pool Company | Pool Installers has the highest customer rating on this Islip list at 4.9 stars across 109 reviews. Gappsi, Inc. has the largest review count (525 reviews at 4.8 stars). PoolPad orders the list with a weighted score that combines customer rating and review count, so a long track record counts for more than a handful of scores.
In most cities yes — any pool more than 18 to 24 inches deep needs a permit, electrical inspection and a barrier, regardless of footprint. Setbacks from property lines and the house decide where a small pool can go. New York has no single statewide contractor license — licensing runs by county and city (Nassau, Suffolk, Westchester, and NYC all license home improvement contractors), so verify locally. Statewide, new pools must meet the residential code's barrier requirements and include a pool alarm; towns layer their own fence and setback rules on top.
A fiberglass or precast plunge pool is often swimmable one to three weeks after excavation; a custom gunite plunge takes six to ten weeks because the shell has to cure before the finish. Permits add time up front, and the deck follows the pool.
Check plunge pool builders in cities near Islip, or open the New York directory for every listed market in the state.
Claim your free PoolPad listing, check plunge and small pools among the pool types you build, and show Islip homeowners with a small yard what fits.
