Drain Report Inclusions That Support Better Decisions

A drain report is only useful when it answers the question that triggered the inspection. Whether you are buying a home, planning an extension or checking a site before excavation, the right drain report inclusions turn an underground unknown into information you can act on. A few photos and a statement that the drain is ‘clear’ may be enough for a simple blockage call-out. It is not enough for a building consent, a works over application or a property decision involving real risk.

For homeowners, a proper report can identify a defect before it becomes an excavation job. For architects, surveyors and builders, it can confirm where pipes run, what they connect to and whether the proposed work conflicts with existing assets. The inspection scope should match the decision at hand.

What a useful drain report should establish

At its core, a CCTV drain report records the observed condition of accessible pipework at the time of inspection. It should make clear what was inspected, where the camera travelled and what was found. It should also separate confirmed facts from assumptions.

Underground drainage cannot always be inspected end to end. Access points may be buried, the pipe may be blocked, a junction may prevent further travel, or the line may be too damaged for a camera to pass safely. A dependable report does not hide those limits. It identifies uninspected sections and explains why they could not be surveyed.

For a routine condition assessment, the report should allow a property owner to understand whether the drain is functioning, whether defects are present, and what practical work may be required. For design and compliance work, it needs to provide information another professional can use with confidence.

Core drain report inclusions

Site details and inspection scope

The report should identify the property, inspection date, client and reason for the survey. It should state the pipes or drainage systems included, such as foul water, stormwater or both, along with the access points used.

This sounds administrative, but it prevents confusion. A report that covers only the line from a gully trap to the boundary cannot be relied on as evidence that every private and public drain on the site has been inspected. Clear scope is especially important when several buildings, tenancies or drainage networks are involved.

CCTV observations and footage

A written description should be supported by clear CCTV images or video footage where appropriate. The footage provides context that a short note cannot always capture, particularly for cracks, root intrusion, displaced joints, sags, corrosion, obstructions and changes in pipe material.

The report should record the approximate position of each significant observation. Depending on the equipment and site conditions, this may be measured from the access point, referenced to the pipe run, or tied to a surface location. Camera distance is useful, but it is not the same as an accurately surveyed position. Where exact horizontal location or level matters, drainage locating and survey information may also be needed.

A good report uses plain language alongside technical descriptions. Rather than simply recording ‘defect observed’, it should explain whether the issue is likely to restrict flow, allow soil or roots into the pipe, affect structural condition, or require further investigation.

Pipe layout, direction and connections

A drainage report should show the direction each line runs and, where it can be established, where it discharges or connects. This may include gully traps, inspection points, downpipes, sewer connections, stormwater connections, manholes and boundary points.

For renovation or construction planning, a site plan is often one of the most valuable inclusions. It can show the approximate route of drains in relation to the house, proposed works, driveways or other fixed features. This helps project teams avoid a common and expensive problem: discovering a drain only after excavation has started.

The level of detail depends on the purpose of the report. A basic diagnostic survey may use marked-up photos and a simple sketch. A report supporting design, consent or construction coordination may require a more detailed drainage plan, location marks on site, and information that can be incorporated into project documentation.

Condition findings and defect grading

Drain condition is more than a pass-or-fail result. A pipe can still carry water while having defects that will worsen over time or become a problem when ground loading changes. The report should identify material, where visible, and describe relevant condition issues such as cracking, open joints, deformation, root ingress, displaced connections, scale build-up, collapsed sections or standing water.

Where a grading system is used, it should be explained. A severity rating can help prioritise repairs, but it should not replace the underlying observation. For example, minor root intrusion may be suitable for maintenance and monitoring, while a displaced or collapsed pipe may need repair before building work proceeds.

It is also worth distinguishing between a blockage and its cause. Clearing a line may restore flow, but CCTV inspection can show whether the blockage was caused by wipes, roots, a broken pipe, poor fall or a construction-related obstruction. The remedy changes depending on the cause.

Recommendations that match the evidence

Recommendations should be practical and proportionate. A report may recommend cleaning, jetting, repair, replacement, additional locating, excavation to expose a connection, or further investigation of an inaccessible section. It should explain why the recommendation is being made and identify any urgency.

For a homeowner, the most useful advice often sets out what needs attention now and what can be monitored. For a project team, recommendations should identify implications for programme, design and access before work starts. Broad statements such as ‘repair as required’ do not give either audience enough to plan from.

A drainage inspection specialist can diagnose and document the issue. The report should not overstate what can be confirmed without exposing pipework or undertaking further work. That level of restraint is a sign of sound technical reporting, not uncertainty.

When works over reporting requires more detail

Works over is required when a building is proposed over, or close to, council or Watercare-owned drainage assets. In these cases, the report is not simply a condition check. It supports an assessment of the asset, its alignment and the relationship between the drain and proposed construction.

Works over report inclusions commonly need to address the location and condition of the relevant public asset, accessible manholes or inspection points, pipe size and material where identifiable, and CCTV evidence of the section being assessed. A plan showing the proposed building footprint in relation to the drain is usually essential to the wider application process.

The exact documentation required can vary with the asset owner, site constraints and nature of the proposal. A new dwelling, retaining wall, garage, deck or major extension can raise different questions. Early drainage investigation gives the design team time to adjust a footprint or foundation solution before plans are locked in.

This is where generic pre-purchase-style reporting falls short. The report needs enough technical detail for project stakeholders to assess risk and prepare the documentation required for approval.

What may sit outside the report scope

A CCTV survey is highly effective, but it has boundaries. It does not automatically prove legal ownership, establish every buried utility on site, confirm pipe depth at all points, or verify that a drainage system complies with every current standard. It records what can be observed and located using the agreed method on the day.

Similarly, a clear camera run does not guarantee there are no drainage issues beyond the inspected route. A hidden branch, buried access point or inaccessible section may require separate investigation. If surface levels, precise coordinates or design set-out are critical, a surveyor or additional locating work may be needed.

Being clear about these limitations protects everyone involved. It also helps clients commission the right level of inspection rather than paying for a report that cannot answer their actual question.

Choosing the right report for the job

Before booking an inspection, state what decision the report needs to support. A homeowner concerned about recurring overflows needs a different outcome from a builder preparing for excavation. A purchaser may want evidence of condition and likely repair exposure, while an architect may need pipe positions and confirmation of a public asset before finalising a design.

Provide available plans, proposed building drawings and known drainage information before the visit. These documents help focus the inspection and reduce the chance that a key line is missed. On site, access to manholes, gully traps and internal fixtures may also affect what can be inspected.

A well-prepared report does not merely document what is below ground. It gives the next person in the process a clear starting point - whether that means arranging maintenance, pricing repair work, revising a design or progressing a consent application with fewer surprises.