Buying an older home can be exciting. Mature neighborhoods often offer larger lots, established landscaping, unique architecture, and character that newer developments simply can’t match. However, there’s one major component of the home that buyers rarely think about until it becomes an expensive problem—the underground sewer line. A standard home inspection does not include the inside of the sewer lateral because it cannot be visually inspected without specialized equipment. That’s why adding a sewer scope inspection is one of the smartest investments you can make before closing on an older home.

What Is a Sewer Scope Inspection?

A sewer scope inspection uses a specialized waterproof camera that is inserted into the home’s main sewer cleanout. The camera travels through the sewer lateral toward the city connection while recording high-definition video. This allows inspectors to evaluate the condition of the underground drain line without digging or damaging the property. A sewer scope can reveal problems that are completely invisible during a standard home inspection.

Why Older Homes Have Higher Sewer Risks

Many homes built decades ago still have their original sewer piping.

Depending on the age of the home, these pipes may be constructed from materials such as:

• Clay pipe
• Cast iron
• Orangeburg pipe
• Older ABS piping
• Aging PVC installations

As these materials age, they become more susceptible to deterioration, shifting soil, root intrusion, corrosion, and cracking. Even if everything inside the home drains normally during your walkthrough, hidden damage may already exist underground.

Common Problems Found During Sewer Scope Inspections

Tree Root Intrusion

Tree roots naturally seek moisture and often enter tiny joints or cracks in sewer lines. Over time, these roots grow larger, slowing drainage and eventually causing complete blockages. Root intrusion is one of the most common defects found in Southern California sewer lines.

Cracked or Broken Pipes

Ground movement, aging materials, and heavy loads above the pipe can create cracks or broken sections. These damaged areas may allow wastewater to leak into the surrounding soil while allowing dirt and roots to enter the pipe.

Offset Pipe Connections

As homes settle over time, sections of pipe can shift apart. These offsets create areas where debris collects, increasing the chance of future backups.

Corroded Cast Iron

Older cast iron sewer lines gradually rust from the inside. As corrosion worsens, the interior diameter shrinks, restricting drainage and increasing the likelihood of clogs.

Bellies in the Sewer Line

A “belly” occurs when part of the sewer pipe sags below the proper slope. Water and waste collect in these low spots instead of flowing freely to the sewer connection. Repeated backups often begin in these areas.

What Happens If Sewer Problems Are Missed?

Hidden sewer defects can become very expensive after closing.

Potential repairs may include:

• Sewer cleaning
• Root removal
• Spot repairs
• Trenchless pipe lining
• Complete sewer replacement
• Landscape or hardscape restoration

Depending on the extent of the damage, repair costs can range from several hundred dollars to well over $20,000. Discovering these issues before purchasing gives buyers valuable negotiating power.

Can You Use the Results During Negotiations?

Absolutely.

If significant sewer defects are found, buyers may request:

• Repairs before closing
• A credit toward future repairs
• A reduction in the purchase price
• Additional evaluation by a licensed sewer contractor

Having documented video evidence makes negotiations much easier because everyone can see the condition of the pipe.

Does Every Home Need a Sewer Scope?

While newer homes can also develop sewer problems, sewer scope inspections are especially valuable when:

• The home is more than 20 years old.
• Large trees are located near the sewer line.
• The property has experienced previous plumbing backups.
• The sewer pipe material is known to deteriorate with age.
• You want to reduce the risk of unexpected repair costs after moving in.

Even if no defects are found, many buyers appreciate the added peace of mind.

What’s the Difference Between a Home Inspection and a Sewer Scope?

A home inspection evaluates the home’s readily accessible systems and components, including:

• Roof
• Exterior
• Foundation
• Electrical system
• Plumbing fixtures
• HVAC
• Attic
• Interior

The underground sewer line cannot be fully evaluated during a visual home inspection. A sewer scope inspection complements the home inspection by examining one of the property’s most expensive hidden systems. Together, they provide a much more complete picture of the home’s overall condition.

Protect Your Investment Before Closing

A home purchase is one of the largest financial decisions most people will ever make. Adding a sewer scope inspection can uncover costly hidden problems before they become your responsibility. At Signature Home Inspection, we provide professional sewer scope inspections throughout Orange County and Los Angeles County using specialized inspection equipment. Our detailed reports include video documentation and clear recommendations to help buyers make informed decisions before closing.