Free tool
Septic & sewage cost calculator
Get an indicative cost for emptying, installation, replacement, treatment plants and drainage fields in Cornwall. It's a guide to set expectations — the exact figure comes from a free quote.
Septic & sewage cost estimator
A quick, indicative range for Cornwall. For an exact figure, get a free quote.
Indicative estimate
£180–£320
Emptying / de-sludging (per visit) · 3 bed · Easy access · per empty. Excludes VAT, ground surprises and permit costs where applicable.
What drives the price
- Job type — emptying is a few hundred pounds; a new treatment plant runs into five figures.
- Property size — more bedrooms means a bigger system and more capacity.
- Access — tight or remote sites cost more for tankers and diggers.
- Ground conditions & permits — soil, water table and location can add cost, especially for drainage fields.