How to Prepare for a Drain Survey in 9 Steps

A drain survey is most useful when the technician can see the full picture - not just the section of pipe that happens to be easy to reach. Knowing how to prepare for a drain survey means arranging practical access, gathering the right property information and being clear about what you need the inspection to answer. A little preparation can prevent delays and produce a report that is genuinely useful for repairs, a building project, a purchase decision or consent documentation.

For Auckland properties, this can be particularly valuable where drainage is old, shared, poorly documented or close to proposed building work. CCTV inspection can show what is happening underground, but the quality of the outcome depends on access, site conditions and the purpose of the survey.

How to prepare for a drain survey before the appointment

Start by explaining why you have booked the survey. A homeowner with recurring blockages needs a different investigation from a builder planning an extension, or a surveyor confirming the location of drainage before excavation. State whether you are concerned about a specific issue, such as slow fixtures, gully overflow, smells, flooding or a suspected broken pipe.

If the survey relates to a property purchase, renovation, subdivision, building consent or works over requirements, advise this when booking. The inspection team can then plan the appropriate scope and reporting. A basic fault-finding camera inspection may identify a blockage, but a project may also need pipe locations, depths, directions of flow, photographs, site plans or formal documentation.

It also helps to identify any deadlines. Consent and construction programmes can be tight, particularly when excavation or foundation work is due to begin. Booking early gives time to investigate unexpected findings rather than forcing a rushed decision after works have started.

Gather plans, reports and property details

Bring together any information you already have, even if it is incomplete. Previous drainage plans, building plans, LIM information, old survey plans, consent documents and earlier plumbing invoices can all provide useful context. They may show likely drain routes, connections, easements or work completed by a previous owner.

Do not assume old plans are completely accurate. Drainage may have been altered, extended or repaired over the years. However, these records give the technician a practical starting point and help compare documented services with what is found on site.

For commercial sites and larger developments, nominate one person who can provide plans and answer questions on the day. This reduces confusion where several parties are involved, such as the architect, project manager, surveyor and building contractor.

Make drain access points clear and available

A CCTV camera normally enters the drainage system through an accessible point such as an inspection opening, gully trap, toilet or other suitable access. Before the appointment, locate any visible inspection openings and make them easy to reach. They are often hidden under garden growth, stored materials, pavers, deck furniture or vehicles.

Move vehicles away from driveways, access chambers and suspected drain routes where possible. Clear tools, building materials, pot plants and outdoor furniture from likely work areas. If a gate is locked, a dog is on the property or access is through a tenant's area, arrange this in advance.

Inside the building, ensure the team can access relevant toilets, bathrooms, laundry areas or kitchens if these may be required for the investigation. A tenant or homeowner does not need to prepare the plumbing itself, but someone authorised to allow access should be present.

If an inspection opening is buried, damaged or inaccessible, tell the drainage specialist before they arrive. There may still be another entry point, but the survey method, time required and results may be affected. Never attempt to force open a cover or dismantle plumbing if you are unsure what it serves.

Keep the area safe for inspection work

Drain surveys are generally straightforward, but the technician needs a safe route between the vehicle, equipment and access points. Let them know about steep paths, narrow side access, loose dogs, electrical hazards, unstable ground, construction zones or areas where children may be playing.

On a construction site, normal site safety requirements still apply. Confirm induction procedures, required personal protective equipment, site contact details and any restrictions around machinery movements. If the inspection is near an excavation, confirm whether the area is safe and whether the relevant contractor needs to be present.

For rural or large properties, explain where the vehicle can park and whether there are long distances, locked gates or difficult terrain between the road and the drainage system. This information helps avoid lost time and ensures the right equipment is available.

Avoid masking the problem before the survey

If you are booking a drain survey because of a recurring fault, avoid making major changes immediately beforehand unless there is an urgent health or flooding issue. Repeatedly using chemical drain cleaners, for example, can create a safety risk and may not solve a structural problem such as root intrusion, displaced joints or a damaged pipe.

Likewise, a recent high-pressure clean may remove debris that would otherwise help explain why the drain was failing. Cleaning is sometimes the right first step, particularly when the line is fully blocked, but the purpose should be clear. A camera survey after cleaning can assess pipe condition, while a survey before cleaning may help identify the cause of the obstruction.

Tell the technician about any recent drain clearing, repairs or heavy rain. These details affect how findings are interpreted. A clear pipe on the day is not always evidence that the underlying issue has been resolved.

Prepare for water testing if needed

A camera inspection often benefits from water running through the system. This helps confirm flow direction, reveal slow sections and show whether fixtures are discharging as expected. The technician may ask for a toilet to be flushed or a tap to be run for a short period.

If water use is restricted on site, or the property has a rainwater or wastewater system with special operating conditions, mention this beforehand. For vacant properties, make sure water is connected if testing is required. Where there is a suspected leak, surcharge or overflow risk, the inspection team will determine the safest approach rather than simply running more water.

Check who needs the report and what it must include

Before the survey, establish who will rely on the findings. A homeowner may need a plain explanation of defects and recommended next steps. A builder or architect may need accurate drain positions relative to a proposed extension. A purchaser may need evidence to assess potential repair costs before going unconditional.

Works over situations require particular care. If a proposed building will be over or near council or Watercare-owned drainage assets, a works over inspection and supporting information may be required as part of the approval process. The required level of detail depends on the asset, its location and the proposed works. Raise this early so the inspection can be scoped for the project rather than treated as a standard domestic drain check.

Ask what deliverables will be supplied, such as CCTV footage, photographs, a written condition report, location information or a drainage plan. This avoids the common problem of having a useful inspection but not the documentation needed for the next stage of a project.

Be available to discuss what is found

You do not need technical drainage knowledge to get value from the appointment. Being available by mobile, or having an authorised site representative present, means questions can be answered while the technician is on site. This is especially helpful when a drain route is unclear, an access point cannot be found or the camera identifies a defect that needs further investigation.

Ask practical questions: Is the pipe flowing correctly? Where is the defect? Is the issue likely to worsen? Does it affect the planned building area? What information is confirmed, and what still needs to be located? A good survey separates observed facts from assumptions and identifies any limitations, such as inaccessible sections or a line that could not be traversed.

Know when the survey may need more than one visit

Not every drain can be fully inspected in one session. Severe blockages, collapsed pipes, inaccessible access points, extensive private networks or active construction works can limit camera travel. In some cases, drain cleaning, excavation, additional access or locating work is needed before the full condition can be confirmed.

This is not a failed survey. It is a useful finding in itself, provided the report clearly records what was inspected, what could not be inspected and why. Drainage TV Ltd approaches this work as a specialist inspection service, so the focus is on obtaining clear evidence and practical next steps rather than guessing at underground conditions.

The best preparation is simple: provide context, clear access and make sure the survey is scoped for the decision you need to make. Once the drains are visible on camera, you can move forward with evidence instead of assumptions.