CCTV drain surveys · Hemel Hempstead & the Chilterns
What’s going on down there?
We put a camera in your drains and show you. Then we fix only what needs fixing. Scroll to come with us.
Layer 01 · Topsoil
Where the trouble starts.
Lawns, shrubs and the roots that go looking for water. Most blockages we clear begin within arm’s reach of the surface: a collapsed gully, a downpipe packed with moss, or one hungry hedge finding a joint.
Hemel Hempstead, 18 cm of dark loam over everything else.
Layer 02 · Clay-with-flints
Clay moves, pipes crack.
On the Chiltern plateau the soil is sticky clay full of flint. It swells in winter and shrinks in a dry summer, and old clay pipe joints shear with it. That is why we survey after every long hot spell.
Layer 03 · Flint bands
Hard as nails, sharp as glass.
Flint nodules sit in bands through the chalk beneath. Digging through them is slow, which is exactly why we prefer to reline a pipe from the inside rather than open the garden up.
Trenchless relining: one access point, no trench.
Layer 04 · Chalk
Bone dry, and nearly there.
Pure white chalk, old sea floor, and the reason water here drains well and flints turn up in every flower bed. Your lateral drain runs just above it. Time to climb into the pipe.
Lateral drain · Ø150 mm vitrified clay · 2.10 m down
Into the pipe.
Run report · 14.2 m · 4 observations
Defect schedule.
That is what a survey gives you: a clear, coded picture, a plain-English opinion and a fixed price before we touch anything. This is what we do with it.
- SVYSame week
CCTV drain survey
Crawler camera, full colour footage, coded report in 24 hours. Used by mortgage and insurance valuers.
- JETSame day
High-pressure jetting
Descale, de-root and flush from chamber to sewer. Camera before and after so you see the difference.
- CLR2 hr call-out
Blockage clearance
Sinks, toilets, gullies and shared drains. Out within two hours for emergencies.
- LINOne day
Patch and full relining
A resin liner cured in place. A new pipe inside the old one, with no digging up the garden.
- DIGQuoted
Excavated repairs
When a pipe has truly collapsed we dig neatly, replace the section and put the turf back.
- SOKSurveyed
Soakaways and drainage design
Chalk takes water well. We test, size and build soakaways that actually soak away.
How a visit goes
- 00.0 m
You call
Tell us what the drain is doing. We give you an honest idea of cost on the phone.
- 04.5 m
Camera in
Through the nearest chamber or gully. You can watch the screen with us.
- 09.0 m
Plain-English report
Footage, codes, a marked-up plan and one recommendation. No jargon, no upsell.
- 14.2 m
Fixed and re-checked
Camera back through afterwards, so the proof is on screen before we leave.
Hemel HempsteadBerkhamstedTringKings LangleyHarpendenSt AlbansWatfordChesham
Call-out
Something down there?
Tell us what you can see. We’ll ring back within the hour in working hours.
01632 960921hello@underhill-drainage.example