Emergencies
Collapsed Drain Repair Cost: Excavation vs. Relining — Realistic Prices
Realistic UK prices for collapsed drain repair, drain surveys and relining vs excavation. Know what to expect before you call a drainage contractor.
Published 3 August 2026
Collapsed Drain Repair Cost: What You Can Realistically Expect to Pay
A collapsed drain is one of the more expensive plumbing problems a homeowner faces, but costs vary enormously depending on depth, access, method and location. This guide gives you an honest breakdown of typical UK prices so you can budget sensibly and ask the right questions before work begins.
If you have sewage backing up into your home right now, stop reading and call 07725 479493 — cost conversations can happen once the immediate risk is under control.
Step One: The Drain Survey
You cannot price a collapsed drain repair without first knowing where the collapse is, how bad it is, and what caused it. A CCTV drain survey is almost always the starting point.
Typical drain survey costs
| Survey type | Typical UK price range |
|---|---|
| Single-run CCTV survey (up to 30 m) | £80 – £180 |
| Full property drain survey (multiple runs) | £150 – £350 |
| Drain mapping / drainage survey with report | £250 – £500+ |
| Pre-purchase drainage survey | £150 – £400 |
Drain mapping cost sits at the higher end because the surveyor traces every run, records invert depths and produces a scaled drawing — useful for planning applications, insurance documentation or older properties with no existing plans.
Always ask for a written report with CCTV footage. That record belongs to you and is what your insurer will ask for if you need to make a claim.
The Two Main Repair Methods
Once the survey has located and classified the collapse, your contractor will recommend either no-dig relining or open excavation. The right choice depends on the severity of the damage, the pipe material, the depth and what surrounds it.
1. Drain relining (no-dig)
A resin-impregnated liner is inserted into the existing pipe and inflated against the walls. When cured, it forms a new pipe within the old one. No trenches, no reinstatement.
When it works: cracks, partial collapses, root ingress, joint displacement — provided the pipe retains enough shape for the liner to pass through.
Typical collapsed drain repair cost (relining):
- Short section (up to 3 m): £600 – £1,200
- Mid-length run (3–10 m): £1,200 – £2,500
- Longer runs or larger-diameter pipes: £2,500 – £5,000+
Relining is generally cheaper than excavation when access is straightforward, because there is no digging, no skip hire and no surface reinstatement.
2. Open excavation and pipe replacement
Where the pipe has fully collapsed, is badly misaligned or sits beneath a structure, excavation is unavoidable. The old pipe is dug up and replaced with new.
Typical collapsed drain repair cost (excavation):
- Shallow run in soft ground, good access: £1,500 – £3,500
- Moderate depth or under a driveway: £3,000 – £6,000
- Deep excavation, under concrete or close to foundations: £6,000 – £15,000+
The wide range reflects real variables: depth adds shoring costs; driveways and patios add reinstatement; proximity to gas or water mains slows progress.
What Drives the Cost Up
- Depth. Drains deeper than 1.5 m usually need shored trenches, which adds labour and equipment.
- Surface material. Block paving, tarmac and concrete all cost more to reinstate than gravel or lawn.
- Access. A drain running under a garage, extension or boundary wall is far more complex than one in an open garden.
- Pipe diameter. Larger-diameter pipes (150 mm+) cost more to line or replace.
- Root damage. Roots that have caused the collapse may have spread further along the run, extending the repair length.
- Location within the system. Private drains are your responsibility; shared sewers are typically the water company’s (Thames Water in most of the TW area). A survey will confirm ownership.
What Is Usually Included — and What Is Not
A reputable quote should itemise:
- CCTV survey and written report
- Excavation and disposal (if applicable)
- New pipe, fittings and bedding material
- Backfill and compaction
- Surface reinstatement (confirm the spec — like-for-like or basic?)
- Post-repair verification survey
Not always included: skip hire, traffic management permits, structural engineer sign-off for deep excavations, or specialist reinstatement of block paving. Ask explicitly.
Insurance and Documentation
Some home insurance policies cover sudden and unforeseen drain collapse. Check your policy wording for “escape of water” or “underground services” cover. What insurers typically ask for:
- The CCTV survey report and footage
- Photographs of the damage and the affected area
- A written scope of work and invoice from the contractor
- Evidence the collapse was sudden rather than gradual deterioration
A good contractor will provide all of this automatically. Keep every document — the paperwork is yours to submit to your insurer directly.
Getting a Fair Quote
- Always get at least two written quotes after the survey.
- Be wary of verbal estimates given without a camera survey.
- Ask whether the price includes a post-repair CCTV check — it should.
- Check the contractor is registered with WaterSafe or a recognised trade body.
Need Help Now?
If you are in the TW postcode area and have a drain that has collapsed or is backing up, call us any time on 07725 479493. We will carry out a CCTV survey, talk you through the options and give you a clear written quote before any work begins.