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Trench underground services.
Trench for water, gas, electric or fibre cable — excavated to depth, sand-bedded and warning tape laid.
✓ Updated May 2026✓ Free quotes✓ Vetted pros
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Costs, timelines, pitfalls and the right questions to ask before any groundworks starts on trenching for Underground Services.
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Service strikes
Hitting underground gas/water/electric. Pre-dig surveys essential.
Inadequate depth
Gas: 600mm minimum. Water: 750mm. Electric: 600mm.
Inadequate separation
Services need spacing apart. Standard distances regulated.
Bedding sand missing
Pipes settle and crack. Bedding sand essential.
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
Service trench per metreStandard 600mm deep
£30–£150
Deeper trench (1m+) per metreFor sewer/large services
£50–£200
CAT survey (existing services)Pre-dig
£150–£500
Bedding sand per metreAround pipes
£5–£15
Marking tapePer metre
£2–£8
Surface reinstatementPer metre, varies
£20–£80
!
Quote spread is typically ± 18% — always get 3 quotes.
At a glance
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Groundworks explained
Trenching for underground services — water, gas, electric, drainage. Specialist work with safety requirements. Expect to pay £30–£150 per metre for UK service trenching.
What Does the Work Involve?
Specialist contractor surveys for existing services (CAT survey). Marks trench route. Mini-digger excavates trench 600-1000mm deep, 300mm wide. Services laid at correct depth and separation. Bedding sand around pipes. Marking tape. Backfilled. Surface reinstated.
Typical Costs
| Item | Low (£) | High (£) | Notes |
|---|---|---|---|
| Service trench per metre | 30 | 150 | Standard 600mm deep |
| Deeper trench (1m+) per metre | 50 | 200 | For sewer/large services |
| CAT survey (existing services) | 150 | 500 | Pre-dig |
| Bedding sand per metre | 5 | 15 | Around pipes |
| Marking tape | 2 | 8 | Per metre |
| Surface reinstatement | 20 | 80 | Per metre, varies |
| 20m typical service trench | 800 | 3,500 | Domestic install |
How Long Does It Take?
20m trenching: 1-2 days. Plus reinstatement.
DIY or Professional?
Specialist groundworker. CAT survey before digging mandatory for safety.
Choosing the Right Tradesperson
NFB member or specialist groundworker. CAT-trained for service detection.
UK Regulations
HSG 47 (Avoiding danger from underground services). CDM 2015. Pipe burial depths regulated. Utility company approvals.
Common Problems
- Service strikes: Hitting underground gas/water/electric. Pre-dig surveys essential.
- Inadequate depth: Gas: 600mm minimum. Water: 750mm. Electric: 600mm.
- Inadequate separation: Services need spacing apart. Standard distances regulated.
- Bedding sand missing: Pipes settle and crack. Bedding sand essential.
Frequently Asked Questions
How deep should trench be?
Gas: 600mm. Water: 750mm. Electric: 600mm. Drainage: depends on falls. Different services at different depths.
CAT survey essential?
Yes — Cable Avoidance Tool detects existing services. £150-£500 pre-dig. Saves £000s in damage.
Mini-digger or hand trench?
Mini-digger: faster, easier. Hand trench: where machinery can't access. Cost varies.
Reinstatement included?
Usually — trench reinstated to original surface. Garden, lawn, driveway depends on location.
Cost as part of new build?
£800-£3,500 for typical 20m service run. Part of £2,500-£15,000 service connection total.
Will trenching damage trees?
Yes if within root zone. Tree survey before. Trenches outside root zone or avoided.
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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