Residential excavation is the controlled digging and trenching that underground utility work requires — replacing sewer laterals and water service lines, running new gas piping, and exposing buried pipe for repair. It covers utility locates, permits, trench depth below the freeze line, shoring, backfill compaction and site restoration.
What residential excavation covers
Excavation on a house is almost always in service of something buried: a sewer lateral, a water service, a gas line, a drain line or a conduit run. The dig itself is the means, not the job. What we are usually doing underneath it is one of these:
- Replacing a failed or undersized main water line between the meter and the house
- Replacing or spot-repairing a sewer lateral that has collapsed, bellied or filled with roots
- Exposing a line for repair at a known defect rather than replacing its full length
- Trenching for a new gas line to a garage, range, grill or outbuilding
- Opening up a section of failed supply pipe as part of a repiping project
- Installing or replacing a cleanout so the line can be accessed without digging next time
Locates and permits come before the shovel
Nothing gets dug until the underground utilities are marked. Colorado law requires notifying Colorado 811 before excavation, and the utility owners come out and paint or flag their facilities — gas, electric, water, telecom and cable — in the standard color code.
Two things homeowners should know about locates. First, 811 marks utility-owned lines only. Private lines on your property — the gas run you had added to the back patio, the conduit to the detached garage, sprinkler mains and septic components — are not marked by 811 and have to be located privately or hand-dug around. Tell us what you know is out there; a homeowner's memory is often the only record.
Second, marks are approximate. Crews hand-dig within the tolerance zone either side of a mark rather than running a machine up to it, which is slower and is the reason it is done that way.
Permits depend on jurisdiction and scope. Work in the public right-of-way, taps at the main, and sewer and water service replacements generally require a permit and an inspection. Smith pulls the permits for our work and schedules the inspections. If anyone offers to skip that, it is a problem for you at resale, not for them.
Depth, the freeze line and why trenches are deeper here
Buried utilities sit below frost depth so they do not freeze, and in this part of Colorado that means water services run meaningfully deeper than people expect — several feet, with local code and the utility setting the requirement rather than convenience.
Sewer depth is driven by something different: slope. A sewer lateral has to fall continuously from the house to the main, so its depth at the house is a function of where the main sits and how far away it is. On some lots that means a trench much deeper at one end than the other, and depth drives everything about the dig — shoring requirements, spoil volume, equipment selection and how long the trench can stay open.
Trench safety is not negotiable. Past a certain depth a trench gets sloped, benched or shored before anyone enters it. That is a worker-safety requirement, and it is one reason a deep replacement is a bigger job than a shallow one of the same length.
Colorado soil, and what it does to a dig
Front Range ground is not uniform and the differences matter.
Expansive clay
Much of the Colorado Springs area sits on expansive clay soils that swell when they take on water and shrink when they dry. For excavation that has two consequences: backfill has to be placed and compacted in lifts rather than simply pushed back in, and a poorly backfilled trench will settle into a visible depression across your yard over the following seasons — or worse, channel water toward the foundation.
Cobble, caliche and shallow bedrock
Plenty of local lots turn up heavy cobble or run into rock at modest depth. That changes equipment, timeline and sometimes approach entirely. It is also the single most common reason a dig takes longer than the original estimate, which is why we would rather look at the site first than quote blind.
Groundwater and monsoon season
Late-summer afternoon storms fill open trenches fast. Scheduling, dewatering and keeping a trench open no longer than necessary are all part of planning work in July and August here.
Access constraints
How we get equipment to the work decides a lot. A front-yard water service with driveway access is straightforward. A back-yard sewer line on a lot with a six-foot gate, a retaining wall and mature trees is a different job with the same linear footage.
- Gate and side-yard width determines whether a compact excavator fits or the work goes in by hand
- Mature trees mean root systems to protect, and often the roots that caused the sewer problem
- Driveways, patios and walkways may have to be cut and replaced, which belongs in the scope up front
- Sprinkler systems will be crossed; knowing where the zones and mains run saves repairs
- Spoil staging — the excavated dirt has to go somewhere on site until backfill
Restoration: putting the site back
Backfill is compacted in lifts, not dumped. Topsoil goes back on top, hardscape that was cut gets replaced, and we talk through landscaping before we start so expectations are set. Some settlement over the first season is normal in clay soils even with correct compaction, and it is worth watching and topping off rather than ignoring.
Grading matters more here than in flatter places. A trench line that ends up pitched toward the house concentrates monsoon runoff exactly where you do not want it.
When excavation is not the right answer
Digging is disruptive and we do not propose it when something less invasive does the job.
- When the line has not been inspected. Repeated backups are not proof of a broken pipe. A camera inspection tells you whether you have roots, grease, a belly or a genuine failure — three of those four are cleared, not dug.
- When a cleaning will do. A root intrusion cleared by drain and sewer cleaning may buy years. Roots come back, but that is a maintenance decision, not an emergency excavation.
- When the defect is one spot. A single offset joint or a crushed section is often a spot repair, not a full-length replacement.
- When the problem is inside the house. Low pressure at one fixture, slow drainage at one sink, or a water heater issue are interior problems. Nothing outside needs opening.
Smith runs the camera first, shows you the footage, and recommends the least invasive option that actually solves it — with options and upfront pricing before work begins. See our drain and sewer services for what happens before a dig is ever on the table.
Frequently asked questions
Do I need a permit to dig up my own sewer or water line?
Generally yes. Sewer and water service replacements, taps at the main and any work in the public right-of-way require a permit and inspection in most Front Range jurisdictions. Smith pulls permits and schedules inspections as part of the job. Unpermitted underground work tends to surface as a problem at resale rather than at the time.
When is excavation not the right answer for a sewer problem?
When nobody has looked inside the line. Repeated backups are often roots, grease or a soft blockage, all of which are cleared rather than dug. A camera inspection distinguishes those from a collapsed or bellied pipe. Even with real damage, a single offset joint or crushed section is frequently a spot repair instead of full replacement.
How deep does a trench have to be in Colorado Springs?
Water service lines are buried below frost depth, which in this area puts them several feet down, with local code and the utility setting the requirement. Sewer depth is governed by slope instead — the lateral must fall continuously to the main, so depth at the house depends on where the main sits and how far away it is.
Will excavation destroy my yard and can it be put back?
A trench line is disruptive while open, but the site is restored: backfill compacted in lifts, topsoil replaced, and any cut driveway, patio or walkway rebuilt as part of the scope. Some settlement over the first season is normal in Colorado's expansive clay soils and is worth topping off rather than ignoring.
Does 811 mark every line on my property?
No. Colorado 811 marks utility-owned facilities only — gas, electric, water, telecom and cable up to their point of service. Private lines you or a previous owner added, including gas runs to a patio or detached garage, sprinkler mains and septic components, are not marked. Those need private locating or careful hand-digging.