What a trenchless company actually does
A trenchless company in Denver, Colorado may be a plumbing firm that added a lining rig, a drain-cleaning outfit that subcontracts the liner, a dedicated rehabilitation contractor, or a franchise operating under a manufacturer's system. The label tells you nothing about which. What matters is whether the people who will be on your property have installed a cured-in-place liner many times in pipe like yours, own or control the equipment to clean, inspect, wet out, invert and cure it, and can show you the result. The vetting below is built around evidence a homeowner can check.
Questions to ask before a quote
- Who installs the liner? Your own crew, or a subcontractor? If a sub, who is responsible for the warranty?
- How many laterals like mine have you lined in the past year? A number, not a range, and post-lining video from two or three of them.
- Which liner and resin system do you use, and are you trained on it? Manufacturers such as Perma-Liner train and certify installers on their materials; ask to see the certificate and its date.
- How do you cure? Hot water, steam, UV or ambient; the answer should match the equipment on the truck.
- What standard does the installed liner meet? ASTM F1216 for inverted liners and ASTM F1743 for pulled-in liners are the usual references. The proposal should name one.
- What do I receive when you leave? The right answer includes pre-lining and post-lining video files, a written scope, and the warranty document.
What verified and certified mean
Certified usually means a manufacturer has trained the company on its liner system and stands behind the material when it is installed as trained. It says nothing about business practices. Some inspectors hold NASSCO certification in pipe condition assessment, which means their video is coded to a recognized standard. Verified, when used by a directory or a network, should mean someone has checked the company's license, insurance, equipment and a sample of completed work rather than simply accepted a listing fee. Ask any directory what its verification consists of; how installers are verified for CIPP work sets out what a meaningful check covers. A checked company is not guaranteed to do good work, but an unchecked one is asking you to do the checking yourself.
Confirm license and insurance directly, not from the proposal. Most states and many cities license plumbing or sewer contractors; look up the number the company gives you on the issuing body's own site and confirm it is active and in the same name. Ask for a certificate of insurance sent from the insurer or agent, naming general liability and workers compensation. Requirements vary by state and municipality, so find out what applies in Denver rather than assuming.
Video before and after
A trenchless job without video is a job you cannot evaluate. Before lining, the company should run the camera through the cleaned pipe and give you the footage showing the defects that justify the work, the length, and the condition of every connection. After lining, a second run should show a continuous smooth wall, each branch connection reopened cleanly by the robotic cutter, and tight terminations at the cleanout and the main. You should receive the actual files. They are how you confirm you got what you paid for, how you make a warranty claim, and what a future buyer's inspector will want to see.
Warranty on the liner versus warranty on the labor
Proposals often advertise a long warranty without saying what it covers. The material warranty comes from the liner manufacturer and covers defects in the tube and resin; it typically runs for decades and is valid only if the installer was certified and followed the specification. The labor or installation warranty comes from the company and covers the things that go wrong from installation: a wrinkle, a lift at a connection, a soft spot from an incomplete cure, a failed end seal. That warranty is only as good as the company's continued existence, and it is usually much shorter. Read both documents. A long installation warranty from a young company is a promise; a manufacturer warranty backed by a recorded certification is a fact you can check. The 50-year design life quoted for CIPP is an industry engineering figure, not a warranty from anyone, and a company that presents it as a guarantee is misstating it.
Red flags
A quote given without a camera inspection, or from a video the company will not share. Pressure to sign the same day, especially during a backup. A price far below the others with no explanation of what was left out. Refusal to say what liner system is used or who installs it. No license number on the proposal, or a number that does not match the company name. A warranty described as lifetime without a document. Reluctance to pull a permit where one is required; the permit and the municipal inspection protect you. Any claim that the liner cannot fail or that video afterward is unnecessary. None alone proves a bad company; two or three together are enough to move on.
Putting it together in Denver
Get your own inspection video first, or make sure the first company's video is yours to share. Send it to two or three companies and ask for written proposals on the same footage. Compare the liner system, cure method, standard, inclusions, both warranties and the license number, then check the license and insurance yourself. Working through vetted trenchless sewer contractors in Denver gives you a shortlist that has already passed a first screen, and verified CIPP installers serving Denver lists installers whose equipment, certifications and sample work have been reviewed, which is where the vetting should start rather than end.
Common questions in Denver
What should I ask a trenchless company in Denver before hiring them?
Who installs the liner, how many similar jobs they have done recently, which liner system and cure method they use, which ASTM standard the work meets, whether they are certified on the material, and what video and documents you receive at the end.
What does a certified trenchless company mean?
Usually that a liner manufacturer has trained the company on its system and backs the material when installed as specified. It does not cover business practices, licensing or insurance, which you confirm separately.
Should I get video from a trenchless contractor?
Yes, both before and after lining, as actual files you keep. The pre-lining video justifies the work and the post-lining video proves the liner, connections and terminations were done properly.
What is the difference between the liner warranty and the labor warranty?
The manufacturer warrants the tube and resin against material defects, often for decades, provided a certified installer followed the specification. The company warrants its installation, usually for a much shorter period, and only for as long as it stays in business.
What are the biggest red flags with a trenchless company?
Quoting without a camera inspection, refusing to share video, same-day pressure, a price far below the others, no license number, a lifetime warranty with no document, and reluctance to pull a required permit.