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Trace hidden drains.
Drains traced using sonde or CCTV — map of underground pipework drawn for renovation or sale.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any drain specialist starts on drain Tracing.
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Hiring a drain specialist, without the regret.
Four moves that separate a smooth job from a nightmare.
Hidden manholes
Manholes paved over, lost. Tracing locates and exposes.
Cross-connection confirmed
Tracing reveals misconnections.
Old surveys outdated
1970s plans don't match current drainage. Trace before assuming.
Multiple owners' drains
Drains cross boundaries. Identifies ownership.
Costs & timeline
Know what it costs. Know when it ends.
Indicative UK ranges and what affects price.
Cost range
By job type
Inc. VAT · 2026
Source: NMT quotes
Source: NMT quotes
Standard drain tracing2-4 hours
£150–£400
Multi-system tracingFoul + surface water
£300–£800
CCTV + tracing combinedMap and inspect
£250–£700
Tracing for new connectionPre-construction
£200–£500
Pre-purchase tracingFor survey/buyer
£200–£500
Deep drain tracingUnderground >2m
£300–£800
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Drain Specialist explained
Drain tracing locates hidden underground drains using sondes and CCTV. Useful for new connections, repairs, or pre-purchase surveys. Expect to pay £150–£600 for UK drain tracing service.
What Does the Work Involve?
Specialist drainage contractor with electronic locating equipment. Sonde (transmitter) inserted into drain. Detector follows transmitter signal underground. Mapping shows drain route. CCTV often combined for visual inspection. Map plotted on property plan.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Standard drain tracing | 150 | 400 | 2-4 hours |
| Multi-system tracing | 300 | 800 | Foul + surface water |
| CCTV + tracing combined | 250 | 700 | Map and inspect |
| Tracing for new connection | 200 | 500 | Pre-construction |
| Pre-purchase tracing | 200 | 500 | For survey/buyer |
| Deep drain tracing | 300 | 800 | Underground >2m |
| Comprehensive site survey | 500 | 2,500 | Whole property |
How Long Does It Take?
Standard tracing: 2-4 hours. Comprehensive: half a day. Plus report (1-3 days).
DIY or Professional?
Specialist drainage contractor with locating equipment.
Choosing the Right Tradesperson
NADC member with electronic equipment. Map provided as deliverable. CCTV combined adds value.
UK Regulations
No specific Building Regs for tracing. Required for new connections (water authority).
Common Problems
- Hidden manholes: Manholes paved over, lost. Tracing locates and exposes.
- Cross-connection confirmed: Tracing reveals misconnections.
- Old surveys outdated: 1970s plans don't match current drainage. Trace before assuming.
- Multiple owners' drains: Drains cross boundaries. Identifies ownership.
Frequently Asked Questions
When do I need drain tracing?
Pre-purchase, before extension, when drain location unknown, after misconnection suspected.
How accurate is sonde tracing?
Very accurate — within 30-50cm of pipe location. CCTV provides visual confirmation.
Deeper drains harder to trace?
Sonde signal weakens with depth. >3m depth needs specialist equipment. Cost premium.
Will I get a plan?
Yes — quality tracing includes plan on property/site survey. Marks drain routes.
Pre-purchase essential?
For older properties (Victorian, Edwardian): yes. Reveals drainage that's outside property boundary, mis-connected, or under boundary walls.
Cost vs digging?
Tracing: £150-£400. Excavation to find: £500-£2,500. Tracing first is no-brainer.
This guide was written with AI assistance and is intended for general information only. Prices are estimates based on UK averages and may vary by region. Always get at least three quotes and consult a qualified professional before starting any work.
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