Add-on and standalone scopes are different transactions.

Why the add-on is often cheaper

During a full home inspection, the inspector is already scheduled, traveling to the property, and preparing a report. A sewer scope can be added to that visit without a second mobilization. A standalone appointment carries the full scheduling and travel cost.

Choose add-on when

• You are already booking a full home inspection.
• The same inspector or company will perform the sewer scope.
• The published price explicitly labels the service as an add-on.

Choose standalone when

• The home inspection is already complete.
• You want an independent sewer specialist.
• You need a repeat scope, locate, or second opinion.