Why a Sewer Inspection Is More Important Than a Roof Inspection Before Buying a Home

Written by Steven Shipler, Texas Licensed Master Plumber, Responsible Master Plumber (RMP), MBA, and host of Plumbing Ed on YouTube.

A roof inspection is important before buying a home. But a sewer inspection may be even more important because the most expensive problem is often the one you cannot see.

A roof is visible. The shingles, flashing, gutters, decking, and storm damage can usually be inspected from the outside. But the sewer line is buried underground, below the yard, below the driveway, below landscaping, and sometimes below the concrete slab foundation.

That is why every serious home buyer should schedule a sewer camera inspection before closing.

Roof Problems Are Visible. Sewer Problems Are Hidden.

A roof inspection can identify missing shingles, hail damage, worn flashing, leaking valleys, soft decking, poor ventilation, or old roofing material.

Those issues matter.

But most roof problems are visible or at least accessible. The inspector can walk the roof, use a ladder, use a drone, enter the attic, and document what is seen.

Sewer problems are different.

The sewer line may be buried several feet underground. It may run under the driveway. It may cross below mature trees. It may pass under the slab foundation. It may be made of cast iron, clay, Orangeburg, concrete, or older PVC.

The toilets may flush during the showing. The sinks may drain during the general inspection. The seller may say there are no plumbing problems.

None of that proves the underground sewer line is in good condition.

The Real Risk: The Sewer Line Can Fail After You Close

A home buyer can close on a beautiful home and then discover sewer problems weeks or months later.

Common hidden sewer defects include:

• Cast iron corrosion
• Pipe separations
• Offset joints
• Tree root intrusion
• Sewer bellies holding standing water
• Broken pipe sections
• Collapsed pipe
• Improper slope
• Old clay pipe failure
• Under-slab sewer damage
• Failed previous repairs
• Grease and sludge buildup

Cost Comparison: Roof Inspection vs Sewer Inspection

A roof replacement may be expensive. But sewer line failure can become a major construction project involving excavation, tunneling, slab access, driveway removal, landscaping damage, city permits, testing, and restoration.

Why the General Home Inspection Is Not Enough

A general home inspection is valuable, but it is not the same as a sewer camera inspection.

Most general inspections test visible plumbing fixtures. The inspector may run faucets, flush toilets, look under sinks, check the water heater, and observe drainage.

That does not show the inside of the sewer line.

A sewer camera inspection is different because it places a camera inside the pipe and visually documents the condition of the underground drainage system.

What a Sewer Camera Inspection Can Find

A sewer camera inspection can help identify:

• Roots entering the pipe
• Separated pipe joints
• Offset connections
• Standing water
• Sewer bellies
• Cast iron scaling
• Cast iron bottom rot
• Clay pipe failure
• Crushed or collapsed pipe
• Improper slope
• Pipe material changes
• Previous repairs
• Blockages and heavy buildup

This gives the buyer evidence before closing. That evidence can be used to request repairs, negotiate seller credits, ask for a licensed plumbing evaluation, or walk away from a high-risk deal.

Real Estate Option Period: This Is the Time to Inspect

In Texas, the option period is the best time to perform deeper due diligence.

Buyers commonly schedule a general inspection, roof inspection, HVAC inspection, foundation evaluation, termite inspection, and sewer camera inspection during this window.

The mistake is treating the sewer inspection as optional.

If the home is older, has mature trees, has cast iron pipe, has clay pipe, has a history of backups, has foundation movement, or is located in an area with older underground utilities, the sewer inspection should be treated as essential.

Three City Examples Where Sewer Inspections Matter

Sewer inspections matter across Dallas-Fort Worth, but they are especially important in established neighborhoods with older homes, mature trees, slab foundations, and aging underground infrastructure.

• Plano, TX: Many older Plano homes may have original cast iron or aging sewer laterals that should be inspected before closing.
• Richardson, TX: Established neighborhoods can have mature trees, older sewer paths, and under-slab drain systems that deserve camera inspection.
• Dallas, TX: Older Dallas homes may have clay, cast iron, root intrusion, bellies, previous repairs, or long sewer runs toward the city tap.

Watch These Sewer Inspection Videos Before You Buy

These videos show why sewer inspections matter before closing. A clean house can still have a damaged sewer line underground.

Tools and Equipment Used During a Sewer Inspection

A proper sewer inspection is not guesswork. It requires professional equipment and an experienced plumbing eye.

• RIDGID SeeSnake sewer camera: Used to visually inspect the inside of the sewer line.
• RIDGID SeekTech locator: Used to help locate the path, depth, and defect area from above ground.
• Hydro jetter or drain cleaning equipment: Used when a line must be cleared enough to complete the camera inspection.

Questions Every Home Buyer Should Ask

• Has the sewer line been camera inspected?
• Can I see the full video?
• Was the inspection performed from the proper cleanout?
• What pipe material is under the home?
• Is there standing water in the line?
• Are there roots, offsets, cracks, or separations?
• Does the pipe run under the slab?
• Are there signs of previous sewer repair?
• Was the line located from above ground?
• Is a written report included?

Helpful Internal Links

• The Ultimate Guide to Sewer Inspections Before Buying a Home
• What Can a Sewer Camera Inspection Find?
• Sewer Inspection Checklist for Home Buyers
• Testimonials
• More Testimonials
• Contact Us

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