| Factor | Ideal Standard | Common Derby Reality | |--------|----------------|----------------------| | | 4K camera, sonde for depth/location, recorded for customer | Basic 480p camera, no depth marking, verbal "it's fine" | | Cleaning | High-pressure jetting (3000+ psi), then robotic cutting of intruding roots | Single jetting pass, leaving debris that blocks liner adhesion | | Liner type | UV-cured glass-fiber reinforced for long bends; epoxy for chemical resistance | Polyester felt liner (shrinks more, less durable) – cheaper but inferior | | Curing verification | Caliper tool to measure wall thickness post-cure | None – "looks hard" visual check | | Warranty | 10–25 years transferable, underwritten by insurer | 12 months, full of exclusions for "ground movement" |
🚩 – They will find a problem you didn't know you had, then upsell relining that day. Pay a third-party surveyor (£150–£250) instead. drain relining derby
A homeowner in Allestree paid £3,200 for a 6-meter reline after roots blocked the kitchen waste pipe. Six months later, roots returned. A second contractor found the liner had only adhered at the top 40% of the pipe – the bottom had debris from poor cleaning. The original firm blamed "excessive ground water." No refund. | Factor | Ideal Standard | Common Derby
🚩 – If the company goes bust (several Derby drain firms have in the last 3 years), your warranty is toilet paper. Six months later, roots returned
