Los Angeles · Pond & Water Feature Services
Koi Pond Design & Construction in Los Angeles
Koi ponds engineered for healthy fish and crystal-clear water — bottom drains, real filtration, and correct depth, built across Los Angeles.
Koi Pond Design & Construction · Los Angeles
Koi Pond Design & Construction Done Right
Los Angeles Pond Builder designs and builds koi ponds for Los Angeles-area homes — ponds engineered around the fish, not just the look. Healthy koi need depth, oxygen, correct turnover, and serious filtration, so we build with bottom drains, settlement and biological filtration, aeration, and the right pump sizing to keep water gin-clear and fish thriving. Naturalistic rock-edged koi ponds or clean formal koi pools, with waterfalls and streams to oxygenate the water. We handle design, excavation, liner, the full filtration system, rockwork, and startup — plus guidance on stocking and care.
How We Work
From the first design walk to the first fill, one project manager runs your build.
1. Design consultation & concept
We talk through your goals — how many koi, show-quality or pet fish, naturalistic or formal — and design the pond around fish health: minimum depth for temperature stability and predator safety, bottom-drain placement, filtration location, and waterfall/return placement for oxygen. You approve the concept before we dig.
2. Excavation, liner & filtration
We excavate to proper koi depth with the right profile, lay protective underlayment and professional-grade EPDM liner, plumb the bottom drain to a settlement chamber and biological filter, and install a correctly-sized, energy-efficient pump for full turnover. Aeration and any UV clarifier roughed in as specified.
3. Rockwork, startup & stocking guidance
Our crew sets the boulder and gravel edge, builds the waterfall or stream return, fills and dechlorinates, and doses beneficial bacteria to cycle the biological filter. We run the system in, then coach you on how to introduce and stock koi safely and the feeding/care routine that keeps them healthy.
When You Need Koi Pond Design & Construction
A purpose-built koi pond is the right call when:
- You actually want to keep koi, not just have a pond — koi are a long-term investment and can live for decades. They need depth, oxygen, and real filtration to thrive. A pond built for koi is a completely different build than an ornamental water garden.
- You want the water gin-clear — a bottom drain, settlement chamber, and properly-sized biological filter are what keep koi water crystal-clear. Skimmer-only ponds and undersized kits turn green and cloudy with a real fish load.
- You want your fish to survive predators and summer heat — correct depth protects koi from herons, raccoons, and Los Angeles heat spikes. Shallow ponds cook fish and serve them up to predators.
- You’ve lost fish before — most koi losses trace back to poor water quality, low oxygen, or too-shallow water. We engineer those problems out from the start.
- You want a waterfall or stream — moving water isn’t just beautiful, it oxygenates the pond, which koi need. We integrate falls and returns to serve both the look and the fish.
- You want to grow show-quality koi — serious koi keeping needs stable water chemistry, strong filtration, and correct turnover. We can build to that standard, including UV clarification and dedicated bottom drains.
Tell us how many koi you're dreaming of and send a photo of the space — we'll design the pond to keep them healthy and quote it flat-rate. Call: (818) 293-2214
What Affects the Cost of Koi Pond Design & Construction
Koi pond pricing depends on size, depth, and the filtration package. Factors include:
- Size and depth. Koi need real volume and depth, so koi ponds run deeper and larger than ornamental ponds. More water is more excavation, liner, and rock — but also more stable, healthier water.
- Filtration package. Bottom drains, settlement chambers, biological filters, UV clarifiers, and aeration are what keep koi healthy and water clear. A serious filtration build is the core cost difference versus a basic pond.
- Pump and turnover. Koi ponds need enough turnover to move the full volume through filtration regularly. Larger, efficient pumps cost more up front but run clean and cheap.
- Rockwork and waterfall. Naturalistic boulder edges and a waterfall or stream add excavation, plumbing, and hand-set stone — and oxygenate the water for the fish.
- Access and excavation. Machine access makes the dig cheap; hand-digging a deep koi pond in a gated backyard with heavy soil adds labor.
- Permits and barriers. Depth and location can trigger a permit or barrier requirement. We check code and include it in the quote.
We quote koi ponds flat-rate after the design phase — liner, bottom drain, full filtration, pump, rockwork, and biological startup all included.
Frequently Asked Questions
How deep does a koi pond need to be in Los Angeles?
For healthy koi we build to a minimum working depth that gives fish temperature stability and protection from predators like herons and raccoons — generally deeper than an ornamental pond. Proper depth is one of the biggest factors in keeping koi alive through summer heat and winter, and it’s non-negotiable in a real koi build.
Why does my current pond turn green and cloudy?
Almost always undersized or missing filtration for the fish load. Koi produce a lot of waste, and without a bottom drain, settlement, and a properly-sized biological filter, that waste feeds algae and clouds the water. We build the filtration to match the fish so the water stays clear.
How many koi can I keep?
It depends on the pond’s volume and filtration — koi grow large, so stocking is about water volume and turnover, not surface area alone. We design the pond and filtration for the number of koi you want and coach you on stocking gradually so the biological filter can keep up.
Do I need a bottom drain and UV?
A bottom drain is the single best upgrade for koi water quality — it pulls settled waste straight to filtration instead of letting it rot on the liner. A UV clarifier is optional but excellent for keeping water crystal-clear. We build both in when you want show-quality water.
What does a koi pond cost?
A modest koi pond with proper filtration is the entry point; large, deep koi ponds with full bottom-drain filtration, UV, and heavy rockwork are the top end. We quote flat-rate after design — liner, bottom drain, filtration, pump, rockwork, and startup all included.
Planning a pond in Los Angeles?
Tell us about your yard and what you're imagining — we'll send a concept and a flat-rate quote within a few business days.
Or call us now: (818) 293-2214