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If this is for a house purchase in the UK, a drain CCTV survey can be quite worthwhile—especially because drainage defects can become expensive once you own the property.

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1. What a proper CCTV drain survey involves

 

A drainage engineer normally starts by locating the property's inspection chambers/manholes. They may first run water or use a drain rod to establish that the system is accessible.

They then insert a CCTV camera on a flexible cable into the drain. The camera travels through the pipe while recording video.

A good survey should establish:

• Where the drains run.

• The approximate diameter and material of the pipes.

• The condition of the pipework.

• Whether there are cracks, fractures or collapsed sections.

• Whether joints have moved apart.

• Whether roots have entered the pipe.

• Whether there are blockages or significant deposits.

• Whether water is flowing properly.

• Where defects are located, usually by distance from an access point.

• Whether there are unusual connections or redundant pipes.

Some systems also use a sonde/transmitter, allowing the engineer to locate the camera's position from above ground. This can be particularly useful if you need to know exactly where a damaged section is located.

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2. What you should actually receive

This is important when comparing quotes.

I'd want the survey to include more than someone simply saying "the drains look fine."

Ideally, you should receive:

CCTV video

The complete or relevant recorded footage should be supplied to you, preferably digitally.

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Written report

The report should identify defects and explain their seriousness.

For example:

"Root ingress at approximately 12.3m from inspection chamber."

is much more useful than:

"Some roots present."

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Drainage layout

A good survey may provide a plan showing the route of the drains and inspection chambers.

This can be particularly useful if you're buying an older property or one with complicated drainage.

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Defect locations

You want defects referenced to a specific chamber or access point.

For example:

MH1 → 8.6m → displaced joint

rather than simply:

"Pipe damaged."

That distinction matters if a repair is subsequently required.

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3. How much should you expect to pay?

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For a typical UK domestic property, roughly £250–£800 is a reasonable ballpark for a CCTV drainage survey, although difficult access, multiple drainage runs, larger properties and additional tracing can push the price higher.

Be careful with extremely cheap "CCTV surveys."

A £99 inspection that looks at one short section of pipe isn't necessarily equivalent to a £300–£400 survey that systematically examines the property's drainage system.

The important question isn't simply:

"How much is the CCTV survey?"

It's:

"Exactly what drainage will you inspect for that price?"

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4. The biggest thing to watch when buying a house

This is where I'd be particularly careful.

A drainage survey can reveal a problem that a normal home survey may not.

For example, imagine you're buying a £400,000 house.

The general house survey says:

"No obvious significant defects noted."

But the CCTV survey discovers:

Tree roots → cracked clay pipe → displaced joint → partial collapse

The repair could potentially involve excavation, replacement of pipework, landscaping and reinstatement.

Depending on the location and extent of the damage, that can become a significant four-figure or potentially much larger expense.

That's why spending a few hundred pounds before exchange can be sensible.

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5. Not every defect means "walk away"

This is an important point.

Drain CCTV reports can look frightening because engineers sometimes identify numerous defects.

For example:

"Minor joint displacement."

That doesn't necessarily mean the drainage system needs replacing.

Similarly:

"Minor root ingress."

doesn't automatically mean you have a major drainage problem.

You need to distinguish between:

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🟢 Minor

Things such as:

• Minor deposits

• Small areas of root ingress

• Slight joint displacement

• Old pipework that's still functioning properly

These may simply need monitoring or periodic cleaning.

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🟠 Moderate

For example:

• Significant roots

• Repeated blockages

• More substantial joint displacement

• Cracking

• Poor falls

• Persistent standing water

These may justify cleaning, repair or further investigation.

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🔴 Serious

Things such as:

• Collapsed pipe

• Major fractures

• Severe displacement

• Significant leakage

• Failed connections

• A drain serving the property that is structurally failing

These are the situations where I'd want a repair quotation and potentially negotiation with the seller before exchanging contracts.

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6. One thing I'd specifically ask the surveyor

Ask:

"Will you inspect all drainage runs serving the property, including foul and surface-water drainage, and provide the CCTV footage and a written report?"

That's much better than simply asking:

"Do you do CCTV drain surveys?"

I'd also ask:

"Will you identify the location and severity of any defects and provide a drainage plan?"

And:

"If you find a defect, can you provide a repair estimate?"

The last one can be useful, although I'd generally prefer an independent repair quotation for an expensive defect rather than automatically accepting the survey company's repair price.

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7. Foul water vs rainwater drainage

This is another thing people sometimes overlook.

A property may have several drainage systems.

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Foul drainage

Carries wastewater from:

• Toilets

• Baths

• Showers

• Sinks

• Washing machines

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Surface-water drainage

Carries rainwater from:

• Roof gutters

• Downpipes

• Driveways

• Other hard surfaces

Ideally, you want to understand what you're actually inspecting.

Older properties can have complicated drainage arrangements, including combined systems where foul and surface water share drainage infrastructure.

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8. What happens if they find a problem?

Don't immediately panic.

The next step should normally be:

CCTV finding → determine severity → obtain repair estimate → decide what to do.

For example:

Survey: "Cracked pipe at 6m."

You then ask:

Can it be repaired without excavation?

Sometimes a damaged pipe can be repaired using patch lining or full-length pipe lining, depending on its condition and geometry.

Other situations require excavation and replacement.

The cost difference can be substantial.

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9. Who should pay for the repair when buying?

This is where your solicitor/conveyancer becomes important.

If the survey finds a significant defect before exchange, you can potentially:

• Ask the seller to repair it.

• Negotiate a reduction in the purchase price.

• Ask the seller to provide evidence of an appropriate repair.

• Proceed knowing about the defect and budget for it yourself.

• In serious cases, reconsider the purchase.

There isn't generally an automatic rule saying the seller has to fix a defective drain simply because you discovered it.

It's a negotiation/contractual issue, so your conveyancer should be involved before you commit yourself.

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10. A particularly important issue: who owns the drain?

This can get surprisingly complicated.

A drain may be:

• Entirely within your property.

• Shared with a neighbouring property.

• A private drain.

• A public sewer.

In England and Wales, many shared drains/sewers are the responsibility of the local water/sewerage company rather than an individual homeowner, but the exact responsibility depends on the circumstances.

This is one reason a proper drainage survey and your conveyancer's investigation should complement each other.

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11. When I'd strongly consider getting one

I'd be particularly inclined to have a CCTV survey if:

• The property is older.

• It has large/mature trees near drainage runs.

• There have been previous drainage/blockage issues.

• You can see old clay or concrete drainage.

• There are unexplained damp/smell issues.

• The property has an extension or unusual layout.

• The drainage system is complicated.

• You're buying a property where repairs would be financially difficult to absorb.

• The seller has mentioned previous drainage repairs.

• Your home survey raises concerns about drainage.

Large trees + old clay drains is a combination I'd pay particular attention to because roots can exploit joints and cracks.

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12. What I'd do if I were buying the property

If you're currently in the process of buying a house, I'd approach it like this:

Before exchange:

1. Get a proper independent CCTV drain survey.

2. Make sure they inspect the relevant drainage runs, not just one convenient pipe.

3. Obtain the video + written report + drainage plan.

4. If defects are found, ask for their severity to be explained.

5. Get a repair quotation for anything significant.

6. Give the report/quotation to your conveyancer.

7. Use the information to decide whether to negotiate the price or ask the seller to remedy the issue.

8. Only then make your final decision about proceeding.

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One final tip

Don't let the seller's estate agent tell you:

"The drains were checked recently and they're fine."

That's not the same thing as you having your own independent CCTV survey.

If you're buying a particular property, you can tell me roughly how old the house is, whether it's detached/semi/terraced, and whether there are trees or any drainage concerns mentioned in the survey. I can then tell you whether I'd consider a CCTV survey essential, advisable, or probably unnecessary—and what I'd specifically ask the drainage company to inspect.