Garden Route Septic Tank Installations: Septic Tank Installation For Granny Flats & Second Dwellings

Garden Route Septic Tank Installations advises on and installs septic systems for granny flats and second dwellings across Mossel Bay, George, and the Garden Route corridor, a genuinely common addition on larger residential and smallholding properties in this area.

How do you decide between sharing the main tank and installing a separate one?

Two things: how much spare capacity the existing system actually has, and how far apart the two structures sit. Sharing works well when the main tank was built with headroom and the flat is close enough for a straightforward pipe connection. A standalone system usually makes more sense when the main tank is already near capacity, or the flat sits far enough away that a shared connection becomes its own costly piece of infrastructure.

Is a separate system more expensive overall?

Not necessarily. A smaller standalone system sized correctly for a granny flat’s lower occupancy can cost less than extending and potentially upsizing the main system to cover both. We compare both options against your specific site rather than defaulting to one approach.

Does it matter if the granny flat will be rented out rather than used by family?

It matters for sizing, not for the installation itself. A rented unit often sees more consistent, full-time occupancy than a family member’s granny flat used occasionally, and we size against how it will actually be used, not just its floor plan.