Custom koi ponds,
built for real fish.
Fully excavated koi ponds sized for the fish load — 45-mil EPDM liner, mechanical + biological filtration, skimmer, stone edging, and integrated waterfall.
Details that separate
good work from great.
Sized for the fish load
External bio-filter + skimmer matched to fish count — not undersized pond-kit hardware.
45-mil EPDM liner
Fish-safe EPDM over geotextile underlayment, seamed and boot-flashed at penetrations.
Stone edge & waterfall
Natural boulder edge and integrated stone waterfall tied into filter return.
Winter-ready depth
3–4 ft.+ deep with de-icer and aerator provisions for Long Island freeze months.
Why hire us
for Custom Koi Pond Design & Installation.
Licensed & insured
Suffolk County HIC License # 58161-H with full liability and workers' comp coverage.
35 years on Long Island
Family-owned and operating across Suffolk County since 1991.
Workmanship warranty
Every installation is backed in writing — base prep, drainage, and finish work included.
Free written estimate
On-site measure and a clear, itemized proposal before any work is scheduled.
Five steps. One crew.
A cohesive process engineered for durability and professional delivery.
- 01The Discovery
Free estimate
On-site measure, scope, and written proposal — no pressure, no upsell.
- 02The Blueprint
Design & materials
Layout, samples, and finishes confirmed before we mobilize.
- 03The Logistics
Build
Our own licensed crews — no subs — on-site daily until it's done right.
- 04The Build
Walk-through
Punch list closed, site cleaned, and written workmanship warranty issued.
Answers before
you call.
01How deep does a koi pond need to be on Long Island?
How deep does a koi pond need to be on Long Island?
At least 3 ft. for winter survival; we build most at 3.5–4 ft. so koi can overwinter below the ice line.
02How much does a custom koi pond cost?
How much does a custom koi pond cost?
Most residential koi ponds run $18k–$45k depending on size, filtration, stone selection, and waterfall scope. We give an itemized on-site estimate.
03Do koi ponds need a permit in Suffolk County?
Do koi ponds need a permit in Suffolk County?
Depth and location trigger local rules; we handle permitting under License # 58161-H when required.
04How deep should a koi pond be?
How deep should a koi pond be?
At least 3–4 ft. on Long Island so koi can overwinter safely below the ice line.
05How much maintenance is a koi pond?
How much maintenance is a koi pond?
A properly sized filter and skimmer keep it to a few minutes weekly, plus spring and fall service.
Custom Koi Pond Design & Installation across
all of Suffolk County.
Serving Long Island's South Shore and central corridor. Licensed, insured, and locally owned — 35 years building for the towns listed below and every Brookhaven and Islip neighborhood in between.
- Custom Koi Pond Design & Installation in Medford, NY
- Custom Koi Pond Design & Installation in Bellport, NY
- Custom Koi Pond Design & Installation in Patchogue, NY
- Custom Koi Pond Design & Installation in Holbrook, NY
- Custom Koi Pond Design & Installation in Ronkonkoma, NY
- Custom Koi Pond Design & Installation in Sayville, NY
- Custom Koi Pond Design & Installation in Blue Point, NY
- Custom Koi Pond Design & Installation in East Patchogue, NY
- Custom Koi Pond Design & Installation in Bayport, NY
- Custom Koi Pond Design & Installation in Farmingville, NY
- Custom Koi Pond Design & Installation in Selden, NY
- Custom Koi Pond Design & Installation in Center Moriches, NY
More Koi Ponds
work we do.
Build now.
Pay monthly.
Flexible monthly payment plans for patios, driveways, and outdoor living projects across Suffolk County. Licensed & insured. Free estimates.
Financing provided by Hearth. 60-120 month terms. Subject to credit approval. Rates and terms vary by lender.