Replacing sewer drains

[shiny76]

As part of my extension the builder (& Building Inspector) have concluded that I need the drains replacing. These run across the back of the property - a distance of approx 11m.

Any ideas on the cost of replacing these? (I'm just looking for a ballpark figure - from an independent source) Some/Most of the drain pipe has been exposed in digging for the foundations of the new extension.

Thank you in advance

 

[JoeMar]

go on the screwfix or wickes website and price up the materials then add the cost of labour.