What Is Included in a Drain Survey Report?

You have had a CCTV drain survey carried out — or you are thinking about booking one — and you want to know what you will actually receive. A professional drain survey report is a detailed technical document, but it should also be written clearly enough that a non-specialist can understand the findings and make informed decisions. Here is a complete breakdown of what a good report includes, how to read it, and what separates a professional report from a poor one.

The Components of a Professional Drain Survey Report

1. Property and Survey Details

The report begins with the basics:

• Property address and a description of the property type
• Date of survey and name of the surveying engineer
• Client details — who commissioned the survey and for what purpose
• Weather conditions at the time of survey — relevant because heavy rain affects flow levels and can mask or exaggerate certain defects
• Equipment used — the camera type, diameter, and recording format
• Scope of the survey — what was inspected and, importantly, any areas that could not be accessed and why

This section establishes the context. If there is ever a dispute about the findings, the report needs to document exactly when, how, and under what conditions the survey was carried out.

2. Drainage Plan / Layout Drawing

A drainage plan is a bird’s-eye-view drawing of the drainage system as found during the survey. It shows:

• The position of each manhole, inspection chamber, and access point relative to the property and its boundaries
• The direction and route of each drain run — where each pipe goes and what it connects to
• Pipe materials and diameters for each section
• Flow direction — indicated with arrows
• Connection points — where branch drains join the main run
• The location of the public sewer connection (if accessible)
• Any features of note — shared drainage, abandoned connections, live connections from neighbouring properties

This plan is invaluable if you are planning building work, investigating a specific problem, or simply want to know where your drains run. Many property owners have no idea what is beneath their feet, and the drainage plan fills that gap.

For properties in Manchester City Centre and the inner suburbs, drainage layouts can be surprisingly complex — original Victorian systems modified over decades, with later additions, re-routes, and connections that were not always done to a high standard.

3. HD Video Footage

The full video recording of the survey is provided digitally — usually as a download link, USB drive, or via an online portal. The footage shows every metre of pipe that was inspected, with an on-screen distance counter so you can correlate what you see with specific locations in the drainage plan.

Good footage is recorded in HD with adequate lighting. You should be able to clearly see:

• The pipe wall condition — cracks, fractures, deformation
• Joint condition — whether joints are aligned, displaced, or open
• Any obstructions or debris
• Root growth
• Water flow and level
• Changes in pipe material or diameter

The footage is your evidence. If a defect is disputed — by a seller, an insurer, or a contractor — the video provides unambiguous proof of what was found.

4. Condition Grading

This is where a professional report differs most from a basic inspection summary. Each section of drainage is assessed and graded using a standardised system.

The industry standard in the UK is the WRc (Water Research Centre) system, which classifies pipe condition on a numerical scale. Here is what the grades mean in practical terms:

Grade 1 — Acceptable condition. The pipe is in good working order. Minor cosmetic defects may be present (slight discolouration, minor surface deposits) but nothing that affects structural integrity or flow. No action required.

Grade 2 — Minor defects. The pipe has defects that do not currently affect function but should be monitored. Examples include hairline cracks that are not leaking, slight joint displacement (less than 10% of pipe diameter), and minor root ingress that is not obstructing flow. Recommended action: monitor at 2-5 year intervals.

Grade 3 — Defects requiring attention. The pipe has defects that will likely worsen over time and should be repaired at a planned, convenient time. Examples include moderate joint displacement, established root ingress causing partial obstruction, circumferential cracks, and moderate scale build-up. Recommended action: repair within 12 months.

Grade 4 — Significant defects. The pipe has serious defects that are actively affecting function and will continue to deteriorate. Examples include severe joint displacement, dense root masses, partial collapse, and heavy deformation of pitch fibre pipes. Recommended action: repair as soon as practically possible.

Grade 5 — Urgent / collapsed. The pipe has failed or is about to fail. Full collapse, complete obstruction, or structural failure that poses a risk of flooding or further damage. Recommended action: immediate repair.

This grading system gives you a clear, objective basis for prioritising repairs. A Grade 2 defect can wait. A Grade 5 defect cannot.

5. Defect Schedule

The defect schedule is a detailed list of every defect found during the survey, presented in tabular format. For each defect, the report typically records:

• Location — identified by the drain run reference and distance from the camera entry point (e.g., “Run A, 4.2m from MH1”)
• Defect type — using standardised terminology (displaced joint, fracture, root ingress, deformation, etc.)
• Severity — classified according to the grading system
• Description — a plain-English explanation of what was observed
• Still image — a frame captured from the video footage showing the defect
• Recommended action — what should be done and when

A thorough report might list anywhere from zero defects (everything in good condition) to twenty or more in a large or older property. Not every defect requires action — the grading system differentiates between cosmetic issues and genuine problems.

6. Annotated Still Images

Key defects are illustrated with still images captured from the video footage. These are annotated — marked up with arrows, labels, or descriptions to highlight exactly what the image shows. For someone who is not experienced at interpreting drain camera footage, these annotated images are often the most useful part of the report.

A good report includes still images of:

• Every significant defect (Grade 3 and above)
• Each change of pipe material
• Each junction and connection point
• Any area of concern even if graded as minor
• The overall condition of representative sections

7. Flow Assessment

The report should comment on flow conditions observed during the survey:

• Water level in each section — is the pipe running at normal depth, or is there standing water indicating a belly or obstruction downstream?
• Flow rate — is water moving freely, or is it sluggish?
• Surcharging — is the pipe running full, indicating a capacity problem or downstream obstruction?
• Infiltration — is groundwater entering the pipe through defects? This is identifiable by clear water seeping in through joints or cracks.

Flow observations provide context for the structural findings. A displaced joint that is also causing flow disruption is more urgent than a displaced joint in a section with good flow.

If you have received a drain survey report and are unsure how to interpret the findings, get in touch and we will walk you through it. If you need a survey carried out, we provide detailed drain survey reports that meet professional standards and are written to be understood by non-specialists.

8. Recommendations and Urgency Classification

The final section of the report brings everything together with clear, prioritised recommendations:

• Urgent repairs — defects that need addressing immediately or within a short timeframe to prevent flooding, further damage, or health risks
• Planned repairs — defects that should be repaired within the next 6-12 months to prevent deterioration
• Monitoring — defects that are minor and stable, but should be re-inspected in 2-5 years to check for progression
• No action required — sections in good condition that do not need any intervention

Each recommendation includes an outline of the repair method (excavation and replacement, re-lining, patch repair, root cutting, descaling, etc.) and an indication of the likely cost range. This gives you enough information to obtain quotes from drainage contractors and budget for the work.

How Different People Use the Report

A drain survey report serves multiple purposes depending on who is reading it.

Homebuyers

If you are buying a property, the report tells you the condition of the drainage system and flags any problems that could cost you money after completion. You forward the report to your solicitor, who can raise enquiries with the seller’s solicitor. Common outcomes include:

• Price reduction to reflect the cost of required repairs
• Seller agreeing to carry out repairs before completion
• Retention of funds until repairs are completed
• In extreme cases, withdrawal from the purchase

For homebuyer drain surveys, the report format is tailored to the property purchase context, with clear summary findings that solicitors and mortgage lenders can act on.

Insurance Companies

Insurers require drain survey reports when assessing claims for drainage damage, subsidence, flooding, or escape of water. The condition grading, defect classification, and video evidence provide the objective documentation that insurers need to process a claim. A well-structured report with WRc grading carries more weight than a verbal description or informal summary.

Building Contractors and Architects

Before building over or near a drain, or when planning an extension, contractors and architects need to know the drainage layout and condition. The drainage plan shows where pipes run (so they can be avoided or properly protected during construction), and the condition report identifies any pre-existing defects that should be addressed before building work begins.

Property Owners

Even if you are not buying, selling, or claiming on insurance, the report gives you a documented record of your drainage system’s condition. You know what is there, what condition it is in, and what — if anything — needs attention. This puts you in control rather than waiting for a crisis.

What Makes a Good Report vs. a Poor One

Not all drain survey reports are created equal. Here is what to look for — and what to watch out for.

Signs of a Good Report

• Comprehensive coverage — every accessible drain run is surveyed and reported on, not just the obvious or easy-to-reach sections
• Clear structure — logical layout with sections for each drain run, consistent formatting, easy to navigate
• WRc grading — defects classified according to the industry standard system, not just vague descriptions
• Annotated images — still images with clear labels showing exactly what the defect is
• Plain English explanations — technical findings translated into language that a non-specialist can understand
• Specific recommendations — not just “requires repair” but “displaced joint at 4.2m from MH1, recommend excavation and replacement of 1m section, estimated cost £800-£1,200”
• Drainage plan — a clear layout drawing showing the system as found
• HD footage — provided in a viewable format with distance counter

Signs of a Poor Report

• Missing sections — only part of the system surveyed with no explanation of why other areas were excluded
• Vague descriptions — “some defects noted” without specific locations, classifications, or images
• No grading system — findings described in informal language with no objective condition assessment
• Poor quality footage — grainy, poorly lit, or provided in an unusable format
• No drainage plan — footage and commentary only, with no visual representation of the system layout
• Generic recommendations — “further investigation recommended” without specifying what, where, or why
• No still images — relying entirely on the video footage to communicate defects

If you receive a report that falls into the “poor” category, it may not serve its intended purpose. A solicitor reviewing a homebuyer report needs specific, graded findings — not a vague summary. An insurer needs documented evidence — not a verbal opinion. A contractor needs accurate locations and measurements — not approximate descriptions.

Understanding Defect Terminology

Survey reports use standardised terminology to describe defects. Here is a glossary of the most common terms you will encounter:

• Displaced joint (DJ): Pipe sections have moved out of alignment at a joint. Measured as a percentage of pipe diameter.
• Open joint (OJ): A gap has opened between pipe sections at a joint, exposing the surrounding soil.
• Circumferential fracture (CF): A crack running around the circumference of the pipe.
• Longitudinal fracture (LF): A crack running along the length of the pipe.
• Multiple fracture (MF): Several cracks in different directions, often indicating structural stress.
• Collapse (X): Pipe has caved in, partially or completely.
• Deformation (D): Pipe has changed shape from its original circular profile. Common in pitch fibre and some plastic pipes.
• Root ingress (RI): Plant roots have entered the pipe.
• Infiltration (I): Groundwater is entering the pipe through defects.
• Encrustation (EC): Mineral deposits built up on the internal pipe surface.
• Debris (DE): Loose material in the pipe — silt, gravel, or broken pipe fragments.
• Belly / sag: A dip in the pipe gradient creating a low point where water pools.
• Connection defect (CD): A branch connection is poorly made — projecting into the main pipe, at a bad angle, or unsealed.

Each of these has a severity scale, and the combination of defect type and severity determines the condition grade for that section of pipe.

Do You Always Need a Full Report?

Not always. If you are having a drain inspection to investigate a specific blockage or check a repair, a verbal summary with video footage may be sufficient. You know what the problem is — you just need confirmation and a plan to fix it.

But if you are buying a property, making an insurance claim, planning building work, or want a comprehensive record of your drainage condition, a full written report is essential. The cost difference between a survey with a report and a survey without one is typically £50-£100 — a small premium for a document that can save you thousands in property negotiations, insurance claims, or repair planning.

We provide detailed, professionally structured drain survey reports across Manchester and Greater Manchester. Every report includes HD footage, WRc condition grading, annotated images, a drainage plan, and clear recommendations. Book your survey or learn more about our reporting service.