Plumbing · Longmont, CO
How much does sewer line replacement cost in Longmont, CO? (2026)
In Longmont, sewer line replacement runs $3,400–$12,850, with most paying around $8,150 — about 9% above the national average. Replacing the main sewer line from the home to the municipal connection (trenchless or traditional excavation).
Updated June 2026 · Localized estimate, not a quote
Most homeowners pay around $8,150
- Typical cost
- $8,150
- Labor vs US
- US avg
- Climate
- Cold
- Local permit
- $250
Refine your estimate
Tune it to your home to narrow the sewer line replacement range.
Key takeaways for Longmont
- Most Longmont homeowners land around $8,150 for sewer line replacement, within a $3,400–$12,850 range that sits about 9% above the national average.
- Longmont's labor rates are close to the national norm, which keeps this estimate near the countrywide figure.
- Around $250 of the range above goes to the local Plumbing permit, not an extra line item.
- Schedule the replacement early — this typically holds up 50–100 years, and an emergency swap costs full price.
- Skip peak pricing by scheduling in Off-peak winter for planned work; the shift is worth about Around 5%.
What goes into the price in Longmont
A typical Longmont sewer line replacement of $8,150 breaks down roughly like this — materials priced near the national level, labor set by local rates.
| Line item | Longmont 2026 range |
|---|---|
| Materials & equipmentHardware and supplies for the job; national pricing applies almost everywhere you go. | $1,250 – $5,050 |
| Labor & installationRemoval, install and startup labor — the line most affected by where you live. | $1,900 – $7,550 |
| Permit & feesPlumbing permit cost, adjusted to this city's rate. | $250 |
| Total installed cost | $3,400 – $12,850 |
Split from the Longmont estimate using a 60% local-labor share; line items sum to the total.
Why sewer line replacement costs what it does in Longmont
- Longmont's labor rates track the national average closely (based on price levels for the Boulder metro area).
- The cold climate in Longmont adds roughly 5% to typical sewer line replacement pricing versus a neutral climate.
- Longmont's Plumbing permit runs roughly $250, which is already part of the number above.
Sewer Line Replacement cost by line length in Longmont
Sewer replacement is priced largely by the length of line from the house to the city main, at roughly $50–$250 per foot depending on method, depth, and what's above the trench.
| line length | Longmont 2026 range |
|---|---|
| 25 ft (short run) | $2,350 – $6,550 |
| 50 ft (typical) | $3,400 – $9,700 |
| 75 ft | $5,000 – $12,850 |
| 100+ ft (long / deep run) | $6,550 – $19,150 |
National size ranges localized to Longmont labor and climate.
Sewer Line Replacement cost by type in Longmont
| Trenchless lining (CIPP) | $4,450 – $12,850 |
| Pipe bursting | $5,500 – $13,900 |
| Traditional excavation | $3,400 – $13,900 |
Adjusted to Longmont from national type-level ranges.
Sewer Line Replacement cost by efficiency in Longmont
The install method matters as much as the length. Trenchless (pipe bursting or lining) costs more per foot but spares your yard, driveway, and landscaping; traditional open-trench digging is cheaper per foot but tears up the surface.
| Traditional open-trench digPer foot; lowest per-foot cost but full surface restoration | $300 – $400 |
| Trenchless pipe lining (CIPP)Per foot; cures a liner inside the old pipe, minimal digging | $350 – $500 |
| Trenchless pipe burstingPer foot; pulls a new pipe through, breaking the old one | $300 – $450 |
Labor vs. materials in Longmont
Install crew, removal, permit & startup — the part Longmont rates move most.
Equipment & materials — priced closer to the national level.
Split based on a typical $8,150 Longmont project; your mix varies with scope.
How we estimate it
| National range | $3,000 – $12,000 |
| Longmont labor adjustment | ×1 |
| cold climate factor | ×1.05 |
| Local permit | +$250 |
| Longmont estimate | $3,400 – $12,850 |
Promo prices vs. the real cost
Service-call pricing is separate from the project cost:
- "Free" estimate on big jobs$0 — it's a sales visit
- Service / diagnostic call$75–$200
- Camera inspection$100–$350 (sometimes waived)
Additional sewer line replacement costs to budget for
Some of these land on the final invoice and some never surface — it comes down to your home's age, access and existing setup.
| Sewer camera inspection (diagnosis)Confirm the scope before any digging — often credited toward the job | $100 – $500 |
| Permit & inspection | $100 – $1,000 |
| Landscape / lawn restorationOpen-trench only; trenchless avoids most of this | $300 – $4,000 |
| Driveway / sidewalk / concrete repairIf the line runs under paving | $500 – $5,000 |
| Tree / root removal in the trench path | $200 – $2,000 |
Typical national add-on ranges; confirm locally during your quote.
What's included
- Excavation or trenchless boring
- New sewer pipe
- Connection to home and city main
- Backfill, basic restoration and permit
What affects the cost
- Landscaping or driveway restoration
- Line length and depth (frost line)
- Trenchless vs traditional dig
- Soil conditions and access
Ways to save on sewer line replacement in Longmont
- Check if the city owns part of the line
- Trenchless avoids costly excavation and restoration
- Compare excavation vs pipe-lining quotes
- Get a camera inspection — a spot repair may do
How long does sewer line replacement last in Longmont?
Modern PVC and HDPE sewer pipe lasts 50–100 years; cured-in-place liners are rated for ~50 years.
A new line needs little upkeep; budget for an occasional camera check or jetting if you have nearby trees.
Signs you need sewer line replacement in Longmont
- Recurring drain clogs and backups across multiple fixtures
- Sewage smell in the yard or around floor drains
- Soggy, sunken, or unusually green patches in the lawn (sewage leak)
- Multiple slow drains throughout the house at once
- Gurgling toilets or drains when other fixtures run
- Tree-root intrusion confirmed on a camera inspection
- Old clay, cast-iron, or Orangeburg (tar-paper) sewer pipe
Repair or replace in Longmont?
Repair if…
- Damage is one isolated crack or offset joint
- The rest of the line is structurally sound on camera
- A spot repair or partial trenchless lining can reach it
Replace if…
- The line is clay, cast iron, or Orangeburg and failing
- There are multiple breaks, bellies, or root intrusions
- A section has collapsed or sagged (recurring backups)
- Repeated rooter/jetting visits aren't holding the problem
Cost calculator
Sewer line cost by method in Longmont, CO
Enter the run length (most home laterals are 40–100 ft, house to street). Per-foot ranges are localized to Longmont, CO labor.
| Method | Per foot | Total (60 ft) |
|---|---|---|
Open-trench (dig & replace) Traditional dig-up. Cheapest per foot but adds surface restoration (lawn, driveway, patio). | $50–$125 | $3,000–$7,500 |
Pipe bursting (trenchless) Pulls a new pipe through the old one via two access pits — minimal digging. | $60–$200 | $3,600–$12,000 |
CIPP lining (cure-in-place) A resin liner cured inside the existing pipe. No trench, but the pipe must be intact enough to line. | $80–$250 | $4,800–$15,000 |
Add surface restoration for open-trench (concrete/driveway $2–$25/sq ft) and permits where a run crosses into the public right-of-way. Per-foot ranges are national benchmarks localized to Longmont, CO labor — a research estimate, not a quote.
Cheapest time for sewer line replacement in Longmont
You can't time an emergency, but you can time a repipe or sewer job — and doing it in a slower month means slightly better pricing and a crew with the bandwidth to do it right.
Why sewer line replacement quotes vary — and how to compare them fairly
A wide spread between bids rarely means someone is overcharging; it usually means they priced different work. Below is what moves the number and how to line the quotes up.
Why a quote looks high (or low)
- Scope is often unknown until a camera inspection confirms it.
- Trenchless vs. traditional dig is a major price difference.
- Permits, inspection and surface/landscape restoration may be excluded.
Get an apples-to-apples bid
- Clarify who owns the city-side portion of the line.
- Compare pipe material on equal terms.
- Require a camera inspection so the scope is confirmed before work.
- Ask whether trenchless or dig fits your situation and why.
Questions to ask Longmont Plumbing pros
Level the field before you choose — ask each bidder the same questions and watch how the answers differ.
- 1Trenchless vs. traditional dig — which fits my situation and why?
- 2Is a camera inspection included so we confirm the scope before digging?
- 3Are permits, inspection, and surface/landscape restoration included?
- 4What pipe material are you using (PEX vs. copper) and why?
- 5Who is responsible for the city-owned portion of the line?
Sewer Line Replacement in Longmont
How much does sewer line replacement cost in Longmont, CO?
For Longmont homeowners, sewer line replacement typically falls between $3,400 and $12,850 in 2026, averaging close to $8,150. The figure is adjusted for local labor rates, cold-climate factors and permit fees.
Is sewer line replacement more expensive in Longmont than average?
Compared with the rest of the country, Longmont runs about 9% higher than the national average — local labor prices at an index of 1 against the US average. — the local Plumbing permit, about $250, is part of that too.
Do I need a permit for sewer line replacement in Longmont?
Yes — Longmont typically requires a Plumbing permit for this job, running about $250. That cost is already folded into the estimate above.
What affects sewer line replacement cost the most?
Replacing the main sewer line from the home to the municipal connection (trenchless or traditional excavation). That's the baseline — the price moves from there. The biggest drivers are equipment/material grade, the size and complexity of your home, local labor rates, and your climate zone (cold).
How do you budget a major plumbing job?
Big plumbing jobs are unpredictable by nature — the method chosen and what's actually underground move the price more than anything else. Our editors weigh in.
The material case
In freeze-prone regions PEX has the advantage: cheaper, quicker to run, and forgiving when temperatures drop. Copper asks for more up front but outlasts it and can nudge resale with certain buyers. The tiebreaker is your weather and your timeline in the house, not a blanket rule.
The method case
Trenchless runs a higher per-foot rate, but the savings hide in what you never have to rebuild — no torn-up driveway, no re-sodded lawn, no ripped-out patio. Open-cut digging only wins on price when there's almost nothing on top of the line to put back.
The diagnosis-first case
Pricing a sewer or repipe off a hunch invites two bad outcomes: paying to replace pipe that's fine, or missing the section that's actually collapsed. A camera run through the line settles the question before a single dollar is committed.
Underground surprises, not the plumber's brand, are what blow up a repipe or sewer budget. A camera inspection pins down the scope, a trenchless-versus-dig comparison should count the restoration bill and not just the trench, and the pipe material ought to suit your climate.
Editorial analysis by Serhat Özçelik, reviewed by Costadia Editorial. These are our own cost perspectives, not third-party endorsements.
How we calculated this estimate
We start with 2026 national sewer line replacement ranges compiled from contractor-pricing sources (Angi, HomeGuide, Fixr and EnergySage averages), then localize them to Longmont using the BEA Regional Price Parity labor index (×1 here), the IECC cold-climate factor (×1.05) and a typical local permit fee (≈$250). Federal incentive details reference the IRS Inflation Reduction Act (25C/25D) and DSIRE.
This is a planning estimate, not a quote.Actual prices vary with your home's condition, equipment grade and contractor — always confirm with licensed local pros before budgeting.
References & data sources
Our Longmont sewer line replacement estimate is built from these primary, mostly government sources — not a single aggregator.
- Occupational Employment & Wage Statistics (metro wages) — U.S. Bureau of Labor Statistics.Metro-level trade wages behind each city's labor index.
- Regional Price Parities (state & metro) — U.S. Bureau of Economic Analysis.Regional price levels used where metro wage data is unavailable.
- IECC Climate Zones — U.S. DOE — Building Energy Codes Program.Climate-zone factors applied to weather-sensitive projects.
- Home Energy Tax Credits (25C / 25D) — Internal Revenue Service.Federal rebate and tax-credit figures for eligible upgrades.
- Database of State Incentives for Renewables & Efficiency — DSIRE — NC State University.State and utility incentive programs by ZIP code.
Homeowners in Longmont often pair this with
A sewer line replacement rarely happens in isolation — these projects commonly come up alongside it.
Other projects in Longmont
Browse local 2026 costs for every home project in Longmont, CO.