A dozer clearing scrub on a rural parcel beside a compacted crushed-stone building pad, with pale sandy soil in the cut and a culvert at the driveway entrance.

Barndominium Site Preparation in Colorado

Site preparation is everything that happens to the land before the foundation: access, clearing, grading, drainage, the building pad, and planning for the well and septic system. In Colorado the ground itself is the main event. The Colorado Geological Survey calls swelling soil the state's most significant geologic hazard, and on parts of the Western Slope it warns of the opposite — soils that collapse when wet. We start with what is under the building, then shape the site around it.

Stamped drawings where your jurisdiction requires them
Drawn to your jurisdiction's snow, wind and frost values
Start your project

Site Preparation: how the work runs

Four stages, in this order. The sequence matters more than it looks: getting the design values, the water and septic answers and any permits settled before anything is fabricated is what keeps a Colorado build from stalling.

1

Walk the land and read the soils

We look at access, slope, drainage, the likely building spot and where the septic field and well could go. Then a soils investigation: the Colorado Geological Survey says only a competent professional soil engineer and engineering geologist should be relied on to identify expansive clay, and the report they produce drives the foundation and the grading plan.

2

Access and clearing

A driveway that can carry a loaded delivery truck and a crane comes first, with a culvert where it crosses a ditch and a turnaround at the pad. Clearing follows, and in wildfire country clearing is also planning: the ground around the house is part of a hardened exterior where your jurisdiction has adopted Colorado's wildfire resiliency code.

3

Grading, drainage and the pad

The pad is built to the soils report — over-excavation and moisture-conditioned fill on some clays, compacted structural fill elsewhere. The site is graded so water runs away from the building and stays away. The Colorado Geological Survey names water ponding near a foundation during and after construction among the causes of expansive-soil damage, so drainage is designed, not improvised.

4

Well, septic and utilities coordinated

The septic system is sited and designed to your local public health agency's rules under Regulation 43, and the well is placed where the permit and the setbacks allow. Power, propane or gas and the utility trench are routed to suit the building. Everything underground is located before the foundation goes in, so nothing has to be dug up later.

An excavator grading a compacted building pad on a cleared lot, with survey stakes and a drainage swale visible.
The ground decides

On Colorado clay, the most expensive mistake is water in the wrong place

The Colorado Geological Survey says bentonite clays under many populated areas of the state can swell up to 20% by volume when wet and push with a force of up to 30,000 pounds per square foot. They are usually dry until construction disturbs them. Grading that sends roof water toward the foundation, irrigation beside the walls, or a pad left to dry out before the concrete goes in are how a sound design fails. Site preparation is where that is prevented.

Where we deliver site preparation

In Colorado the lines that matter are city limits, county lines and contour lines. Inside a city or town you have its zoning and its building department; out in the county, some counties enforce a building code and some rural ones do not; and in the mountain counties the snow load climbs with elevation, so two parcels in the same county can be drawn to very different roofs. Cross one of those lines and what changes is whether the build is inspected, who reviews the drawings and whose snow, wind and frost values they answer to. The septic permit from the local public health agency and the well permit from the Division of Water Resources go with you almost everywhere.

Barndominium builders across Colorado.

Every city and county we build in has its own answer on permits, septic, water and design values. The service area pages set out what each one publishes.

View our full service area →
Before you commit

What actually decides the price

Square footage is the number everyone leads with, and it is rarely the one that moves a barndominium budget. These four do.

  • What the soils report finds

    Low-swell ground may need little more than a compacted pad. High-swell clay may need over-excavation and moisture-conditioned fill, drilled piers or a structural floor. Collapse-prone soil on the Western Slope may need pre-wetting, removal or a deep foundation. The report is inexpensive compared with the range of outcomes it decides.

  • Access and slope

    A long driveway, a creek or ditch crossing, or a steep mountain approach costs money before the building starts. On a slope, the pad is cut and filled, and retaining walls may follow. A flat plains parcel with a county road at the gate is the cheapest site to prepare; a foothills lot with a switchback drive is among the most expensive.

  • Well depth and septic design

    Well cost follows depth, and depth follows the aquifer under your parcel. Septic cost follows the soil: the local public health agency permits the system under rules at least as stringent as the state's Regulation 43, and poor soils mean a larger or more complex system designed for the site. Neither number can be quoted until the site has been evaluated.

  • Clearing and defensible space

    Clearing a pasture is cheap; clearing timber on a mountain lot is not. Where your parcel is in the mapped wildland-urban interface and your jurisdiction has adopted Colorado's wildfire resiliency code, the ground around the house has requirements of its own, and meeting them during site work costs less than coming back later.

A dozer clearing scrub on a rural parcel beside a compacted crushed-stone building pad, with pale sandy soil in the cut and a culvert at the driveway entrance.

Site Preparation in Colorado: common questions

8 questions we get asked most often about building in Colorado. If yours is not on the list, ask it directly.

Start your project
Do I need a soils report for a barndominium in Colorado?
Usually, and where your building department does not require one it is still worth having. The Colorado Geological Survey calls expansive soil the state's most significant geologic hazard and says only a competent professional soil engineer and engineering geologist should be relied on to identify it. The report tells us what the pad and foundation need before we build either.
What are expansive soils?
Clay soils that swell when they get wet and shrink when they dry. The Colorado Geological Survey says the bentonite and montmorillonite clays under many populated areas of Colorado can expand up to 20% by volume and exert up to 30,000 pounds per square foot. Arid and semi-arid places like Colorado see more of the problem because the soil starts dry and construction wets it.
What are collapsible soils?
Low-density soils that lose volume when they get wet, sometimes suddenly. The Colorado Geological Survey says the hazard was recognised in western Colorado in the 1890s when land was first irrigated, and that it remains one of the primary geologic hazards damaging home foundations in the region. The fix depends on depth and may mean pre-wetting, removal or a deeper foundation.
Who permits the septic system?
Your local public health agency. The state's Colorado Department of Public Health and Environment says septic systems of 2,000 gallons per day or less are permitted by local counties, and each local public health agency has adopted regulations at least as stringent as the state's Regulation 43. The soil evaluation for the septic system is part of site preparation.
Can I get a well on my land?
Probably, but what it may be used for depends on the land. The Division of Water Resources says a new well on a parcel under 35 acres may be limited to use inside one house, while a parcel of 35 acres or more may qualify for a domestic well serving up to three homes, an acre of lawn and garden and livestock. Lots in subdivisions created after June 1, 1972 are often governed by an augmentation plan. We check before site work starts.
When can site work happen in Colorado?
Most of the year at lower elevations; the season is shorter in the mountains. Frozen ground, snow on the access road and spring mud all slow earthwork. The practical aim is to have the foundation in and the building dried in before the hardest winter weather at your elevation.
How does wildfire affect site preparation?
On a forested or grassland lot in the mapped wildland-urban interface, the ground around the house is part of the fire protection. Colorado's 2025 wildfire resiliency code applies where your local government has adopted it. Clearing, grading and the choice of what goes against the foundation are planned with that in mind.
How do I start?
Start the survey with the parcel's location and anything you already know about it — a soils report, an existing well, a perc test or septic permit, or a survey plat. We come back with what the site needs before a foundation can go in.

Keep reading

The pages that answer the next question this one raises.

How Long Does It Take?

Where site work sits in the schedule, including the septic and well permits and frozen ground.

Read it

Barndominium Cost Guide

Site work is the largest wildcard on any rural build. Here is why.

Read it

Where We Build

Who handles permits, septic and water in each Colorado city and county we serve.

Read it

Ready to put site preparation against a real plan? Start there and the rest follows.

Start your build survey

Tell us about the land

Tell us where the parcel is and what you want on it, and we will come back with who has jurisdiction, what the land needs before it can be built on, and a realistic budget range. Starting the survey costs nothing.

Start your project