Two callers can describe the exact same symptom (a recurring smell, a slow drain, a damp patch on the lawn) and need two completely different fixes. The question that actually matters isn’t “survey or dig,” it’s “do we know what’s wrong yet.” That’s the decision this guide is built to help you make.

In short:

• A CCTV survey diagnoses; excavation repairs. Treating them as competing options, rather than sequential steps, is a common way commercial and domestic jobs end up costing more than they should.
• Excavation without a prior survey means digging on a guess: sometimes in the right spot, sometimes not.
• A survey adds a cost most callers weren’t expecting, but it routinely prevents a far larger one: a dig in the wrong place, or a dig that wasn’t needed at all.

What does each method actually do?

A CCTV survey is diagnostic. A camera runs the length of the drain and records what’s there: root ingress, cracked joints, blockages, a “belly” where the pipe has settled, all without disturbing the ground above it. Excavation is corrective. It’s the physical dig required to expose a specific section of pipe and replace or repair it. One tells you what’s wrong and exactly where; the other fixes what’s already been identified. Used correctly, a survey almost always comes first, because it tells the excavation team precisely where to dig instead of where they think the problem probably is.

When is a survey genuinely enough on its own?

If the survey finds a minor issue (light scale buildup, a small root intrusion that can be cut back, a joint that’s displaced but not collapsed), targeted jetting or root-cutting through the existing access points can resolve it without any digging at all. That’s the outcome most survey clients are hoping for, and it’s a realistic one for faults caught early.

When does excavation genuinely become necessary?

Once a pipe has collapsed, cracked through, or settled badly enough that jetting and lining can’t restore proper flow, physical excavation is the only real fix. The survey’s value at that point isn’t in avoiding the dig. It’s in making sure the dig happens once, in the correct spot, at the correct depth, instead of the property being opened up on a guess and the crew finding nothing where they expected it.

What does each option cost against the other?

Exact figures depend on pipe depth, access, and run length. What’s consistent across jobs: a survey is a fixed, planned cost. An unplanned excavation, especially an emergency one, carries reinstatement costs (paving, landscaping, in some cases structural work) on top of the repair itself. Commissioning a survey first is very often the cheaper route overall, even though it adds a line item that wasn’t in the original call.

“Can’t we just skip the survey and go straight to fixing it?”

Sometimes, yes: if the fault is already visible and obvious (a collapsed section exposed by subsidence, for example), a survey doesn’t add much. But even when someone asks for a dig straight away, a survey is usually worth doing first, because without one there’s no way to confirm the full extent of the problem before opening the ground. It’s the difference between fixing the one metre you can see and finding out the crack actually runs for three. For the full breakdown of what a survey checks and how the visit works, see our complete CCTV drain survey guide.

Bee Maintenance carries out both CCTV drain surveys and excavation repairs in-house, and is SafeContractor accredited.