If your pipe is structurally sound, relining is usually faster and less disruptive; if it is collapsed, offset, or cannot meet hydraulic requirements, replacement is required. Relining trades excavation for speed and a smaller mess, while replacement guarantees a fresh, correctly aligned pipe at full diameter. The right call depends on what a camera inspection actually finds, not on which method sounds easier. Standards like ASTM F1216 and a documented CCTV inspection are what separate a good decision from a guess.
TL;DR:
- A single lateral relining job can often finish in a day, while replacement with surface restoration may take several days, depending on access and connections.
- Quotes should specify pipe length, access, connections, resin and cure method, disposal, warranty, reinstated services, and CCTV footage before and after installation.
- Steam curing can release styrene vapor; traps filled with water and running drains during the work help block vapor from entering buildings.
- When camera findings are unclear or marginal, request a liner design tailored to the site rather than a generic estimate, with documented inspection footage afterward.
Table of Contents
- Comparing relining and replacement: pros, cons, and what each one solves
- What happens on site: inspection, installation, and timelines
- What drives cost, how long each fix lasts, and how to read a quote
- The real risks: vapor, cure water, and how contractors should handle them
- A decision checklist before you call a contractor
- My take after years of camera inspections and callback repairs
- Get a camera inspection before you commit to either fix
- FAQ
- Sources
Comparing relining and replacement: pros, cons, and what each one solves
Relining, also called cured-in-place pipe (CIPP), works by inserting a resin-saturated liner into the existing pipe and curing it in place to form a new pipe within the old one. It solves cracks, small infiltration, root intrusion that has not deformed the pipe, and general deterioration where the original alignment and shape are intact. Replacement means digging up and removing the failed section and installing new pipe, and it is the only real option when the host pipe can no longer serve as a form.
- Relining pros: minimal excavation, faster completion, lower restoration costs, and an engineered structural upgrade when the liner is properly designed.
- Relining cons: it depends on a sound host pipe, and resin cure can raise vapor concerns depending on the method used.
- Replacement pros: restores original alignment and diameter, sidesteps cure-related vapor issues entirely, and is the only fix for a collapsed line.
- Replacement cons: higher cost, more disruption to landscaping or flooring, and a longer restoration timeline.
Other trenchless options sit between these two. Sliplining pulls or pushes a new pipe inside the host pipe, a method the National Research Council describes as effective but dependent on careful grouting and connection work, and it reduces the pipe’s internal diameter. Pipe bursting fractures the old pipe outward while pulling a new one into place, which restores full diameter without a trench, but it needs soil conditions that tolerate bursting and often requires access pits at each end. Both sit closer to replacement in terms of disruption and cost than to a straightforward CIPP job.
What happens on site: inspection, installation, and timelines
A relining job and a replacement job share a starting point, a camera, but diverge quickly after that.
Relining steps:
- Pre-installation CCTV inspection to confirm the pipe qualifies for lining.
- Cleaning and root cutting to prepare the pipe wall.
- Flow control or a temporary bypass so water keeps moving during the work.
- Wet-out and insertion of the resin-saturated liner, either inverted or pulled in.
- Curing with steam, hot water, or UV light depending on the resin system.
- Reinstatement of lateral connections and a post-installation CCTV pass to confirm the result.
Replacement follows a different sequence: inspection, deciding on an excavation strategy, removing the failed pipe, resetting bedding and grade, installing new pipe, pressure or flow testing, and finally restoring the surface, whether that is lawn, concrete, or flooring. Canadian procurement documents list these same workflow elements and note that both duration and price scale with pipe length, depth, access, diameter, and the number of service connections involved. A single-lateral relining job can often finish in a day, while a full replacement with surface restoration can stretch across several days, especially with multiple connections, tight access, or poor weather.
Pro Tip: Ask for the pre-installation CCTV footage before work starts, not just a verbal description of what the camera found.
What drives cost, how long each fix lasts, and how to read a quote
Cost for either method moves with a handful of variables, and a quote that skips them is hard to trust.
- Linear footage of pipe being lined or replaced.
- Access conditions and how much restoration the job needs afterward.
- Number of lateral connections that need reinstatement.
- Pipe diameter and the cure method specified for relining.
- Traffic control or permitting needs for work near roads or shared property.
Lifespan expectations should track the engineering behind the job, not a sales pitch. A properly designed liner built to ASTM F1216 and installed under a municipal-grade specification like Toronto’s TS 4.10 is built to function as a standalone structural pipe, and replacement pipe installed to code should perform for its full rated service life. A quote worth signing lists pre- and post-installation CCTV, the specific resin and cure method, disposal handling, warranty terms, reinstatement of services, and QA documentation. If any of those line items are missing, ask why before comparing price.
The real risks: vapor, cure water, and how contractors should handle them
Steam-cured CIPP liners release styrene vapor during the cure, and that is not a minor footnote. Field measurements described in the Journal of Pipeline Systems Engineering and Practice recorded very high styrene concentrations inside laterals during curing.
Water-filled P-traps prevent styrene from migrating into buildings, while dry P-traps allow dangerous concentrations to reach indoor spaces.
Running water through drains before and during a relining job is a documented, effective barrier against vapor intrusion, according to that same field research, and it costs nothing to ask a contractor to confirm it as part of their plan. Cure-water disposal is a separate issue: steam curing produces condensate that may need a discharge permit, while hot-water and UV cure systems generate less wastewater but still require a stated handling plan. Before anyone reenters the space, ask for monitoring logs, a ventilation or containment plan, and final CCTV confirming the liner cured correctly.
A decision checklist before you call a contractor
Match what the camera shows to the fix it calls for, then hold contractors to a specific standard.
- Cracked, corroded, or mildly root-intruded pipe with intact alignment: relining is usually the right fit.
- Collapsed, badly offset, or severely out-of-round pipe: replacement is the only reliable option.
- Reduced diameter already a concern: be cautious with sliplining and weigh it against full replacement.
- Unclear or marginal CCTV findings: ask for a site-specific liner design (SLD or SSLD) rather than a one-size estimate.
Before signing anything, ask which standard they will follow (ASTM or a municipal spec), what resin and cure method they plan to use, whether they can provide an SLD when conditions are unusual, and how they handle pre- and post-work CCTV and cure-water disposal. Workily’s guide on hiring licensed trades makes a similar point for home repairs generally: a vague scope and no documentation plan are reasons to walk away, not negotiate.
Pro Tip: A contractor who cannot produce a camera inspection on request is not ready to quote your job accurately.
My take after years of camera inspections and callback repairs
Most relining failures we hear about did not fail because the method was wrong, they failed because nobody checked the host pipe carefully enough first. A camera inspection takes an hour and tells you almost everything; skipping it to save that hour is how homeowners end up paying twice. We will not quote a relining job without CCTV footage and a clear cure and disposal plan, and we think any contractor who skips that step is cutting a corner that matters.
— Austin
Get a camera inspection before you commit to either fix
We run diagnostic CCTV inspections to find out exactly what is happening inside your pipe before anyone recommends relining, replacement, or hydro-jetting as an alternative to full excavation. Our certified technicians document every step, pre- and post-work footage included, and our pricing is quoted upfront with no surprise line items. If you manage a property and want to catch problems like this before they become emergencies, our maintenance scheduling guide is worth a read too.
We serve homeowners and property managers across Greater Vancouver with 24/7 availability and a satisfaction guarantee on every job. Book a plumbing inspection and get a straight answer on whether relining or replacement fits your pipe.
FAQ
What are the disadvantages of pipe relining?
Relining only works when the host pipe is structurally sound enough to support a liner, so it cannot fix a collapsed or severely offset pipe. Depending on the cure method used, steam-cured liners can release styrene vapor during installation, which is why documented ventilation steps like water-filled P-traps matter.
How long do relined pipes last?
A properly engineered liner built to recognized standards such as ASTM F1216 is designed to function as a standalone structural pipe for its full service life. Actual longevity depends on correct site-specific design and installation quality, which is why municipal specifications require QA documentation and final CCTV before accepting the work.
How much should pipe relining cost?
Cost varies with linear footage, access conditions, pipe diameter, number of lateral connections, and the cure method specified, so there is no single flat rate. We quote relining and replacement jobs individually after a diagnostic inspection; current service details are listed on our services page.
Is relining sewer pipe worth it?
Relining is generally worth it when a camera inspection confirms the host pipe is intact, since it avoids excavation and restoration costs while still delivering an engineered structural fix. It is not worth pursuing on a collapsed or badly misaligned pipe, where replacement is the method municipal procurement documents specify for that condition.
Sources
- Tender notice BC1220-040-2023-039 — CIPP relining procurement (CanadaBuys)
- Health risks assessment from CIPP fugitive styrene emissions — Journal of Pipeline Systems Engineering and Practice (ASCE)
- TS 4.10 CIPP lining of sewers and culverts — City of Toronto specification (Feb 2024)
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