The direct answer
Start with the complete system, not one product or headline rate.
How to identify sewer ownership, survey the route and coordinate foundations before an extension reaches the excavation stage. A dependable plan connects the site evidence, approvals, access, installation sequence and finished reinstatement.
Find the pipe before designing around it
Plans are useful but physical route, depth, diameter, condition and active connections may need confirming by tracing or CCTV survey.
Ownership changes the approval route
A shared lateral or public sewer can require water-company involvement even when it lies inside a private boundary. Private drains are handled differently.
Coordinate structure and access
The solution may be to build over, divert or redesign. Foundations must protect the pipe and future maintenance or inspection requirements must be respected.
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