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Trenchless vs. Excavation: Which Sewer Replacement Is Right for You?
A factual comparison of costs, timelines, yard impact, and winter work — from a Central Alberta company that does both.
Every job quoted in writing before work starts
Trenchless sewer replacement is usually the better choice when your old pipe hasn't fully collapsed, and it isn't sitting on top of something you don't want dug up — a driveway, concrete, or landscaping.
Excavation (digging a trench) is the better choice when your pipe has fully collapsed, slopes the wrong way, or sits under open lawn where digging is cheap.
A camera inspection helps us understand which type of replacement you need.
This guide compares trenchless vs. excavation sewer replacement/repair: what each costs, how long each takes, what happens to your yard, how winter changes things, and how long the new pipe lasts. The same comparison applies to repairs — both methods can fix one bad section as well as replace a whole line.
We are one of the few Central Alberta companies that does both kinds of work with our own crews and equipment. Whatever your pipe needs — trenchless, digging, or a mix of the two on the same job — we can do it.
How Trenchless Sewer Replacement Works
Trenchless replacement gives you a new sewer pipe without digging a trench across your property. The crew works from two small pits, one near each end of the pipe. Your lawn, driveway, and concrete stay in place.
There are two ways to do it. Pipe relining builds a new pipe inside your old one: a flexible liner soaked in resin goes into the old pipe, then hardens under UV light into a solid new pipe. (The technical name is cured-in-place pipe, or CIPP.) Pipe bursting pulls a brand-new pipe along the path of the old one, breaking the old pipe apart as the new one comes through.
Both methods use your existing sewer line as the pathway for the new pipe. That means the old pipe has to be open enough for the equipment to pass through it. You can see how we run these jobs on our trenchless sewer replacement page.
How Excavated Sewer Replacement Works
Excavated replacement is the traditional dig-and-replace job. A crew digs a trench along the full length of the sewer line, removes the old pipe, lays new pipe at the correct slope, and backfills the trench once the work passes inspection.
Where the trench crosses buried gas, power, or water lines, we uncover them with hydrovac digging — pressurized water and a vacuum truck instead of an excavator bucket, so nothing gets damaged. The excavation crews and machines are ours. We don't bring in another company to do the digging.
The work around the digging is handled too. Before the first scoop, every buried line on the property is located and marked, and we obtain any permits the job needs. When the new pipe is in and has passed inspection, the trench is filled back in compacted layers rather than dumped full, so the ground above it doesn't sink over the seasons that follow.
Trenchless vs. Excavation at a Glance
| Trenchless (relining / bursting) | Excavation | |
|---|---|---|
| Typical cost | Relining $8,000–$15,000 · Bursting $9,000–$18,000 | $10,000–$25,000+ — rebuilding the surface is the biggest variable |
| Typical duration | Often a single day | Usually 2–5 days, plus surface rebuilding after |
| Yard and driveway | Two small pits | Open trench along the whole line |
| Old pipe condition needed | Must be open enough to work through | Any condition, including full collapse |
| Winter | Less affected; the liner needs heat to harden | Possible year-round, but frozen ground adds time and cost |
| How long it lasts | Commonly rated around 50 years | New PVC pipe comparable, around 50 years |
| Can they be combined? | Yes — one job can use both, digging only where needed | |
Which Costs Less: Trenchless or Excavation?
Neither one is always cheaper. In Central Alberta, excavated replacement typically runs $5,000–$15,000 and trenchless replacement usually runs $7,000–$15,000.
A major factor in the comparison is what sits on top of your pipe, because whatever gets dug up has to be rebuilt.
If your pipe runs under open lawn, excavation can be the cheaper job, because filling the trench and laying new grass costs little. If your pipe runs under a driveway, a garage floor, or landscaping you care about, trenchless usually costs less in total — even when its base price is higher — because you skip the cost of tearing out and rebuilding what's on the surface.
Our excavation quote covers the new pipe and backfilling the trench to rough grade. Rebuilding whatever sat on the surface is a separate cost, quoted after the ground settles.
Which Is Faster?
On site, the two methods are closer than most people expect: most trenchless replacements finish in a single day, and so do most excavated ones. The difference shows up afterward. A trenchless job is done when the pits are filled. An excavated trench is backfilled to rough grade the same day, then needs time to settle before relandscaping, which we quote separately.
A few things stretch either timeline. Deeper pipes and longer runs add time to both. Tight access, like a pipe running under a garage or between houses, slows excavation the most. Weather affects both, and frozen ground slows excavation more than trenchless. We include the expected timeline in your written quote.
What Happens to Your Yard and Driveway?
Trenchless replacement needs two small pits, each a few feet across, usually near the ends of the pipe. Excavation opens a trench along the entire pipe, through whatever sits above it: lawn, driveway, walkways, garden beds. For many homeowners, this difference matters more than the price difference.
With trenchless, most of the yard stays usable during the work, and the pits are filled back in the same day the job finishes.
With excavation, we backfill the trench to rough grade the same day, but anything removed to dig — concrete, asphalt, fencing, lawn — still has to be rebuilt. We can quote the relandscaping once any fresh fill has time to settle.
One Alberta reality to plan for: if the digging happens in late fall or winter, relandscaping usually waits for spring. The trench is filled and made safe right away, but new concrete and grass go in once the ground has thawed and the fill has settled.
Not Sure Which Method Your Pipe Needs?
A camera inspection shows exactly what shape your line is in — the information you need before anyone talks price or method.
When Trenchless Won't Work
Each trenchless method has its own limits. A liner needs an open pipe we can clean out first. A bursting head is tougher: it breaks the old pipe outward as it pulls the new one in, so it can pass shifted joints and partial collapses that stop a liner. When neither method can get through, digging is the answer, and we'll tell you so.
The camera inspection is what finds these problems:
- A fully collapsed pipe. Pipe bursting works through pipes up to about 85% collapsed and through joints that have shifted out of line. Past that point, nothing can pass, and there is no pathway for the new pipe.
- A 90-degree corner. The bursting head can follow gentle 45-degree bends, but not a hard 90-degree turn. When a line turns a sharp corner that section usually needs to be dug.
- A pipe that can't be cleaned out. We clean the old pipe before a liner goes in. If heavy buildup or damage can't be cleared, lining won't work — though pipe bursting may still be an option.
- Deep cold. Our liners cure with UV light, not heat, but below −15°C we can't install them. In a cold snap, a lining job waits for a warmer window, or we switch to pipe bursting or digging.
If your inspection reveals any of these issues, it doesn't necessarily mean digging up the whole line — often the problem section can be dug out while the rest of the pipe is replaced from the inside. If you're still weighing repair against full replacement, our guide to sewer line repair and replacement in Red Deer walks through that decision.
When Excavation Is Actually the Better Choice
Excavation isn't just the backup plan for when trenchless can't work. For several jobs, it's the better first choice.
The clearest case is a slope problem. A sewer line only works because it runs downhill; gravity moves the waste. If your pipe sags in the middle (plumbers call this a "belly") or slopes the wrong way, waste sits in the pipe instead of flowing out. Trenchless methods follow the path of the old pipe, so they don't repair the bad slope. The only fix is to dig, remove the pipe, and re-lay it at the correct angle.
Digging is also the right call when the pipe is moving to a new route, when it's a brand-new line where no pipe exists yet, and when the pipe is shallow and under open lawn. In that last case, digging is often simply the cheaper job: easy access, little to rebuild, no premium equipment. When the dig is the better and cheaper answer, that's the quote you get.
When One Job Uses Both Methods
Some sewer jobs use both digging and trenchless work on the same pipe. This is common, and it can be the fix that costs the least, because excavation only happens where it's needed.
Here's an example. The camera shows a pipe in decent shape except for one collapsed section near the property line. A liner can't pass the collapse, but digging up the whole run would mean tearing out the driveway. The combined fix: dig one small spot to replace the collapsed section, then line the rest of the pipe from the inside. The driveway never gets touched.
The same combined approach solves other problems. A short section of sunken pipe can be dug out and re-laid at the correct slope, with the rest of the pipe lined. A pipe that runs under both open lawn and a concrete pad can be dug where digging is cheap and replaced trenchlessly where it isn't.
Because our own crews do both kinds of work, we aren't limited to picking one method for the whole job. We can plan a mix that solves the problem while keeping the cost, the timeline, and the digging as small as they can be.
Can You Replace a Sewer Line in Winter?
Yes. Both trenchless and excavated sewer replacement happen year-round in Central Alberta. Sewer pipes don't fail on a schedule, and crews here are equipped for frozen ground. Winter changes how the work is done, and sometimes what it costs. It doesn't mean the work can't be done.
Frozen ground affects digging the most. Breaking through frost could require ground-thawing equipment, heated tents or ground-heating blankets, and more machine time. Snow makes site access harder, frozen fill needs special handling, and surface repairs are done temporarily in winter, then finished in spring. None of this stops the job; all of it adds time and cost.
Trenchless work is less affected by winter, since we only dig two small pits in frozen ground. Pipe liners cure with UV light rather than heat, so we can install in temperatures down to −15°C. If it's colder than that, we can wait for a warmer window or we can switch to pipe bursting.
The practical advice: never put off an active leak, collapse, or sewage backup until spring, because sewage problems get worse, not better. For a replacement that can wait, ask us for a winter quote and a spring quote, each spelling out what surface work is included, and decide with real numbers in front of you.
How Long Does Each Replacement Last?
Both methods give you a pipe that should outlast your time in the house. Cured liners and the pipe used in pipe bursting are commonly rated for about 50 years. New PVC pipe installed by digging lasts about as long. For most homeowners, this is a once-per-ownership decision either way.
Trenchless or Excavation: The Quick Decision Checklist
Trenchless usually wins when:
- The old pipe is still open enough to work through
- Something you want undamaged — driveway, garage floor, concrete, landscaping — sits over the pipe
- The pipe runs true and slopes the right way
- The work has to happen in winter
Excavation usually wins when:
- The old pipe has fully collapsed, or it turns a 90-degree corner
- The pipe sags or slopes the wrong way and needs to be re-laid
- The pipe is moving to a new route, or it's a brand-new line
- The pipe is shallow and under open lawn, where digging is the cheapest fix
And some pipes need a bit of both: one bad section dug out and replaced, the rest lined or burst from the inside. A sewer camera inspection shows which method — or which combination — would be best for your situation. The video gives us what we need to plan a repair or replacement that works, without paying for more than your pipe requires.
What Our Customers Say
Trenchless vs. Excavation FAQs
Is trenchless sewer replacement cheaper than digging?
Sometimes. The base prices are close — usually $7,000–$15,000 for trenchless and $5,000–$15,000 for digging — but the digging price covers the pipe and backfill to rough grade, with relandscaping quoted separately. Under a driveway or concrete, trenchless usually costs less in total. Under open lawn, digging often wins.
Can a sewer replacement use both digging and trenchless work?
Yes. Many jobs combine them: a crew digs out one bad section, such as a collapse or a sag, and replaces the rest of the pipe from the inside with a liner. Combining the methods can cost less than doing the whole job one way, because excavation only happens where it's needed.
Does pipe relining make the pipe narrower?
Yes, a little. The hardened liner sits inside the old pipe, so the opening gets slightly smaller. In practice, this almost never causes a problem. The new liner is smooth, with no joints, so sewage usually flows better than it did through the rough, damaged pipe it replaced.
Can you replace just one section of sewer pipe without digging?
Yes. This is called sectional lining, or a spot repair. Instead of lining the whole pipe, a shorter liner is hardened over just the damaged stretch, such as one cracked segment or one failed joint. It's a good fit when the camera shows a single problem spot in an otherwise sound pipe. The inspection video shows whether a spot fix or a full replacement makes sense.
Does insurance treat the two methods differently?
It can. Whether your policy covers the damage at all depends on what caused it and what your policy says. Once a claim is approved, insurance companies generally look for the lowest reasonable cost that properly fixes the problem, and that can point to one method over the other.
Because we can do both kinds of work, we can quote whichever fix does the job right at the lowest cost — trenchless, excavation, or a combination of the two. The camera footage documents the damage, and the written quote gives your insurer the cost of that fix. Coverage for sewer pipes varies a lot between policies, so check yours. We provide what your insurer needs; our insurance claims page explains how that works.
Start With a Camera Inspection
Before anyone talks price or method, we provide a camera inspection of your sewer line. The video shows exactly what shape your pipe is in, and that's the information you need to plan a repair or replacement that works without costing more than it should. Because we do both trenchless and excavation work — and can combine them on one job — you'll get a straight answer about what fits your pipe.
Still thinking about it? Start with our guide to sewer line repair and replacement in Red Deer.
