The most cost-effective way to go chemical-free. Convert your existing pool to a natural swimming pool for $26,000–$62,000. No new shell required.
Most concrete or fibreglass pools built in the last 30 years can be converted to a natural pool system. The existing shell saves the most expensive part — excavation — making conversion significantly cheaper than a new build.
| Factor | Conversion | New Build |
|---|---|---|
| Upfront cost | $28,000–$55,000 | $58,000–$140,000+ |
| Excavation required | None (uses existing shell) | Full excavation |
| Timeline | 4–8 weeks | 10–18 weeks |
| Design flexibility | Limited to existing shape | Full custom design |
| Regen zone integration | External zone required (extra space) | Fully integrated in design |
| Result quality | Excellent — genuinely chemical-free | Excellent — fully optimised |
| Running costs after | $350–600/yr | $350–600/yr |
A natural pool conversion typically takes 4–8 weeks and involves 5 key stages. Here is what to expect.
A qualified natural pool builder assesses your existing pool's condition, size, and surrounding space. The design accounts for the regeneration zone — either integrated into one end of the existing pool, or built adjacent as a separate water garden. The builder will also check for acid sulphate soils (relevant in Byron Bay and Brisbane lowlands) and confirm council approval requirements.
The existing chlorination system, pump, and filtration equipment are removed. The pool shell is assessed for cracks, surface condition, and suitability for conversion. Minor repairs are made at this stage. Any chemicals are safely removed and disposed of. This typically takes 2–5 days.
The regeneration zone — the biological filtration heart of the natural pool — is installed. This may be a section of the existing pool separated by a submerged wall, or a new adjacent zone. Substrate layers (gravel, biofilm media) are installed to specified depths. This is the most critical technical phase.
Native aquatic plants are installed in the regeneration zone: marginals, emergents, and submerged oxygenators. The biological filtration system takes 6–12 weeks to fully establish from planting. The pool is swimmable during this period but the water will clarify progressively as the ecosystem matures.
New coping, surrounds, and landscape integration is the final stage. Many conversions use this as an opportunity to refresh the entire pool area — new decking, coping, and planting to complement the natural aesthetic. This phase transforms the look from "pool with plants" to a cohesive natural landscape.
Conversion costs vary based on existing pool size, condition, and the regeneration zone design. Here is a typical breakdown.
Total conversion range: $28,000–$55,000 for a standard 40–60m² existing pool. Larger pools or more complex regen zone designs will cost more.
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