The cost of a Parawewa bio septic tank installation in Sri Lanka depends on tank capacity, whether Option A (Gravity) or Option B (Seal Type Parawewa System) is required, site accessibility, and excavation conditions. All installations are backed by the Industry's Best 10-Year Written Warranty for Parawewa Sewerage System. Exact pricing requires a free site inspection.
Septic tank pricing questions in Sri Lanka are common, but a single number rarely tells the full story — the same way two houses of similar size can have very different construction quotes depending on soil, access, and finish level. Understanding what actually drives the price helps property owners compare quotes meaningfully instead of just chasing the lowest number.
What Determines the Final Price
- Tank Capacity: Sized to occupant count and property type — a 5-person home needs meaningfully less capacity than a hotel or factory floor. Use the interactive tank sizer for a starting estimate.
- Option A vs Option B: The Gravity-Fed model has no pump hardware; the Seal Type Parawewa System for high water table sites adds equipment cost but removes the risk of a failed installation on marshy ground.
- Site Access and Excavation: Difficult access, rocky soil, or an already-built property (retrofit) generally costs more than a straightforward new-construction install on open, level ground.
- Distance from Head Office: Transport and logistics for far-flung sites are typically factored into commercial quotes.
Why the Lowest Quote Isn't Always the Cheapest Option
A traditional concrete pit often carries a lower upfront quote than a Parawewa installation — but as covered in our 10-year cost breakdown article, recurring gully bowser fees and, for mechanical STPs, electricity bills can outweigh the initial price difference within a few years. When comparing quotes, ask what is included: the tank unit, excavation, installation labor, and the written warranty terms all affect what you're actually paying for.
Every site is different — request a free inspection from Parawewa for an exact, written quotation for your property.
