Drain unblocking
Available 24/7. We clear blocked drains, sinks, toilets and gullies on the first visit in the vast majority of cases.
Find out moreDrain Mapping for Planning and Extensions
Know what is in the ground before you apply
A drainage map records the route of every run we can access, the invert levels, the pipe sizes and where each connection goes. That is the drawing planning, building control and water companies expect to see with an extension, a loft conversion or a new build.
Doing it before you apply is cheaper than discovering a public sewer under the proposed kitchen, or a private run that has to be diverted after the foundations are in. We combine sonde locating with a CCTV survey so the plan is based on what is actually there, not on an old drawing that may be wrong.
Why choose Drain 247
Local engineers
Based across Hertfordshire, so we are not travelling in from another county.
24/7 emergency response
A real person answers the phone at three in the morning, not an answerphone.
No call-out fees
Fixed, transparent pricing agreed with you before any work starts.
Over 150 five-star reviews
Most of our work comes from recommendations and repeat customers.
Older drainage systems
Specialists in the pitch fibre and clay runs common in Hertfordshire properties.
Survey and repair together
CCTV surveys and no-dig repairs available on the same visit.
What you receive
A scaled plan
Runs plotted against the building, with chambers, gullies and connections marked.
Camera confirmation
We do not guess a connection. If we cannot see it, we say so rather than inventing it.
Invert levels
Depths that an architect or structural engineer can design to, not a sketch on the back of a van ticket.
Build-over support
The same visit can include the CCTV survey a water company wants for a build-over agreement.
Defects flagged
If the map reveals a cracked or undersized run, we quote the repair rather than leaving you to find out later.
Usually a single visit
Most houses in Hertfordshire can be mapped in a morning. Larger sites are quoted separately.
Building an extension this year?
A map before you apply is cheaper than a surprise under the foundations. We can usually attend within a few days.
What our customers say
Great service and a great team of engineers. Wouldn’t hesitate to recommend to anyone. Work carried out to a high standard and the call-out was within the required time.
Brilliant service, they helped unblock my drain really quickly. Would definitely recommend!
Turned up when they said they would, told me the price up front, and cleared a blockage two other firms had failed on.
Related drainage services
CCTV drain survey
High-resolution inspections that identify structural problems, repeated blockages and hidden defects — with a report you can act on.
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Drain repair
Patch lining, full relining and excavation repairs for cracked, collapsed or deteriorated pipework.
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Drain mapping
Accurate mapping of underground drainage for planning applications, extensions and compliance checks.
Find out more
Drain jetting
High-pressure water jetting that scours fat, silt and scale from the pipe wall.
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Tanker services
Vacuum tanker deployment for emptying, interceptors, and jobs too large for a van-mounted unit.
Find out moreAreas we cover
Drain mapping across Hertfordshire and north west London.
- Watford
- St Albans
- Hemel Hempstead
- Rickmansworth
- Bushey
- Croxley Green
- Abbots Langley
- Kings Langley
- Chorleywood
- Berkhamsted
- Bricket Wood
- Cassiobury
- Moor Park
- Borehamwood
- Elstree
- Radlett
- Harpenden
- Potters Bar
- Hatfield
- Welwyn Garden City
- Harrow
- Pinner
- Northwood
- Ruislip
- Harefield
- Stanmore
- Edgware
- Hendon
- Barnet
- Brent Cross
- Wembley
- Enfield
- Aylesbury
- Milton Keynes
Common questions about drain mapping
Do I need drain mapping for an extension?
If you are building near a public sewer you will usually need a build-over agreement, which starts with a survey and a plan. Even on a private run, knowing the invert levels stops the architect guessing.
How is this different from a CCTV survey?
A survey shows the condition of the pipe. Mapping shows where it goes, how deep it is and what connects to it. We often do both on the same visit because the camera is already in the run.
Will I get a drawing I can give to my architect?
Yes. The point of the visit is a plan they can drop into their drawings, not a verbal description of where we think the pipe runs.
Need a drainage plan for planning?
We map the runs, invert levels and connections and hand you a drawing your architect or building control can use.