PLUMBING
How to Estimate a Sewer Line Replacement
Contractor method for estimating sewer line replacement: length, material, depth and access.
Sewer line bids fail on the depth and the access. The trench is the price; the deep dig, the tree roots and the street crossing are where the estimate doubles.
THE SHORT ANSWER
How do you estimate a sewer line replacement?
Camera the line, measure the run, choose the material (PVC about $100/ft, cast iron $150/ft), then price depth (deep +40%) and access (difficult +50%). A 60 ft PVC run starts near $8,000 with moderate access.
Measure the run and inspect the pipe
Measure the run from house to main and camera the line. A sewer camera tells you whether it is a spot repair or a full replacement — never quote a replacement without the video.
Choose the material
Use about $100/ft installed for PVC, $150/ft for cast iron and $125/ft for clay-pipe repair as planning allowances. Replace them with local quotes because depth and restoration can dominate the line item.
Price depth and access
Standard depth (<5 ft) is the baseline; deep trenching adds 40%. Difficult access (narrow side yard, behind landscaping) adds up to 50%. Use the Sewer Line Replacement Cost Calculator to build the full quote.
Check permits and restoration
Permits run $700-$900. Add restoration for the lawn, driveway or sidewalk you cut — many estimators forget it and eat the cost.