Most typical
Does your house unlock a refund?
Most houses are connected to a combined sewer, and here the utility typically gives a refund when roof and surface water are disconnected from the sewer. The default values fit an ordinary house project – adjust them to your home.
← See all scenariosFrequently asked questions
Is the refund guaranteed?
No. The refund is paid out by the utility and depends on their requirements – for example that all roof and surface water is actually disconnected. The calculation is an estimate.
Can I dig the trenches myself?
Yes, you can do the digging yourself while a certified drain-layer sizes and performs the connection. This can reduce the cost significantly.
My perimeter drain also runs into the sewer – does it count?
Yes. If the perimeter drain is connected to the sewer, it typically also has to be disconnected before you can get a full refund. Choose 'Yes' in the calculator so it's included.