Professional outdoor specialists since 1995
Koi Ponds Designed for Beauty, Health & Clear Water
Purpose-built ponds that balance structure, waterproofing, circulation, filtration, fish welfare and the surrounding landscape.
A practical, professional solution
A successful koi pond is a life-support system, not only a water feature
Depth, volume, bottom drains, skimming, filtration, pumps, oxygenation, waterproofing and safe access must work together from the start.
Purpose-built structure
Design depth, shape, reinforcement and viewing features around the site.
Effective filtration
Size mechanical and biological filtration for pond volume and fish load.
Reliable circulation
Position drains, returns, pumps and aeration to reduce dead zones.
Practical maintenance
Provide access to filters, drains and equipment for regular care.
Clear options
Koi pond services
Every final price is confirmed in a written quotation after the project requirements and access have been assessed.
| Option | Quotation | Notes |
|---|---|---|
| New koi pond design & build Structure, waterproofing, circulation and agreed finishes. | Custom | Quoted to suit the property, access and approved scope. |
| Filtration upgrade Mechanical, biological, UV and plumbing improvements. | Assessed | Quoted to suit the property, access and approved scope. |
| Pond repair Leak, structure, lining, plumbing and equipment work. | Diagnostic | Quoted to suit the property, access and approved scope. |
| Waterfall or viewing window Integrated feature subject to engineering and waterproofing. | Designed | Quoted to suit the property, access and approved scope. |
Typical service includes
- Initial consultation or site assessment
- Written scope and quotation
- Suitable materials for the approved work
- Labour and supervision
- Testing or finishing where applicable
- Normal site clean-up
Important quotation information
Published prices, where shown, are indicative starting prices and include 15% VAT unless specifically stated otherwise. Final pricing depends on measurements, specification, access, site conditions, travel and selected materials.
A written quotation takes precedence over website guide pricing.
Solutions and inspiration
Practical results for Gauteng properties
Our process
From first enquiry to a professional result
Measure and plan
Confirm dimensions, volume, level changes, access and viewing points.
Engineer the system
Specify structure, drains, skimmer, returns, filtration, pumps and power.
Construct and waterproof
Build the shell, complete penetrations and apply the approved lining system.
Commission carefully
Test, balance and mature the system before responsible fish stocking.
Why choose Subtropical?
Trusted Gauteng outdoor specialists since 1995
We combine practical experience, coordinated project planning and clear written quotations for dependable outdoor work.
- Outdoor specialists established in 1995
- Residential, estate, complex and commercial experience
- Coordinated garden, pool, irrigation and landscaping expertise
- Quality materials and supervised workmanship
- Clear written quotations before work begins
- Gauteng-wide service, subject to project size and travel
Local Gauteng service
Koi Pond Design, Construction & Filtration Gauteng across Gauteng
We serve Johannesburg, Pretoria and surrounding Gauteng areas. Travel and minimum project requirements may apply outside our core service area.
Frequently asked questions
Koi Pond Design, Construction & Filtration Gauteng questions
How deep should a koi pond be?
Many serious koi ponds are about 1.2 to 1.5 metres deep or more, depending on design, structure and site conditions.
How many koi can the pond hold?
Stocking depends on water volume, adult fish size, filtration and maintenance. A conservative starting point is roughly one koi per 1,000 to 2,000 litres.
Do I need a bottom drain?
Bottom drains greatly improve waste removal in many purpose-built koi ponds and should be designed into the structure from the start.
Can you add a viewing window?
Yes. The panel, frame, structure and waterproofing must be professionally designed for the water pressure and opening size.
Can you repair an existing pond?
Yes. Leaks, plumbing, filtration, pumps, UV, circulation and structural concerns can be assessed.
Ready to take the next step?
Request your free written quotation
Send your suburb, approximate measurements and a few clear photographs. We will advise on the next step and prepare a suitable quotation.
Monday–Saturday: 08:00–17:00 | Closed Sundays and public holidays | Subtropical Garden & Pool Services cc