Fort Collins Paver Patio Guide: Soil & Permits (2026)

Updated October 24, 2026. This guide is general information, not legal or engineering advice. Rules change, so confirm with the agency listed before you start work.

Quick reference

Topic	What to know	Source
Climate	Cold semi-arid; about 15.9 in. precipitation and 51.4 in. snow a year; July mean high 87.4°F, January mean low 18.3°F	Wikipedia (NOAA data)
Frost depth	Minimum 30 inches below grade, countywide	Larimer County Building
Soil	Expansive soil is Colorado's most significant geologic hazard; heaved patios and driveways are a common sign	Colorado Geological Survey
Call before you dig	All property owners, any depth, at least two full business days' notice; free	Colorado 811
Retaining walls	Exempt up to 4 ft without surcharge; taller walls need a permit and a stamped engineered design	City of Fort Collins
Pergolas	Exempt if 120 sq ft or less, 8 ft tall or less, and 3 ft or more from property lines	City of Fort Collins
Fire pits	Permanent wood-burning pits not allowed in city limits; gas pits need a permit	City of Fort Collins
Sidewalk and approach	Separate permit; contractor needs a City Right-of-Way Contractor's License	City of Fort Collins Engineering

How does Fort Collins weather affect pavers?

Fort Collins has a cold semi-arid climate, with about 15.88 inches of precipitation and 51.4 inches of snow in an average year. July mean highs are 87.4°F and January mean lows are 18.3°F, so the ground cycles between frozen and thawed many times each winter. Larimer County's building code sets a minimum frost depth of 30 inches below grade countywide. Frost depth matters most for footings under pergolas, patio covers and similar structures. A paver patio is a flexible surface and isn't built on frost footings, but keeping water out of the base is the best defense against frost heave.

Why is clay soil such a big deal?

The Colorado Geological Survey calls expansive or swelling soil Colorado's most significant geologic hazard, and says it causes more property damage than any other natural hazard in the state. Clays such as bentonite swell when wet and shrink when dry, and semi-arid places like Colorado see more expansion problems because soil moisture swings so much between seasons. CGS lists cracked and heaved sidewalks, patios and driveways as very common indicators of expansive clay. It also names ponding water near a foundation and plantings that send irrigation into the soil next to the house as things that make problems worse. For a patio, that points to a well-compacted base, a slope away from the house, and sprinklers and downspouts that keep water off the pavers and their edges.

Do I have to call 811?

Yes. Colorado 811 says all Colorado property owners must contact 811 before excavating, no matter how shallow or deep the digging. State law calls for at least two full business days' notice, not counting the day of the request. Locating public lines is free; private lines, such as a buried line to a detached garage, are located separately. Your contractor should file the request and keep the marks visible while work goes on.

Which paver-related projects need a Fort Collins permit?

The city's permit exemptions include residential sidewalks and driveways, and retaining walls up to 4 feet tall measured from the low-side grade to the top, as long as the wall doesn't support a surcharge. For tiered walls, the gap between an upper wall and a lower one must be at least the full height of the lower wall. Taller walls need a permit and a design stamped by a Colorado-licensed structural engineer. Pergolas are exempt if they're 120 square feet or less, 8 feet tall or less, and at least 3 feet from any property line; otherwise a pergola permit is required, and prefabricated pergolas must be engineer-stamped. The city stresses that permit exempt does not mean code exempt.

Work on the public sidewalk or a driveway approach needs a Sidewalk and Drive Approach Permit from the city's Engineering department, and the contractor must hold a valid City Right-of-Way Contractor's License for that work category. Cutting in the right-of-way needs an excavation permit. Loveland, Windsor, Wellington and unincorporated Larimer County each run their own permit offices.

What are the fire pit rules?

A City of Fort Collins Building Services memo effective August 11, 2021 says permanent solid-fuel (wood-burning) fire pits are not allowed within city limits under the city's air quality code. Gas fire pits are allowed with a permit and inspections of the gas piping and appliance. The appliance must be listed and labeled to ANSI Z21.97, and the gas line and appliance must be installed by the homeowner, a licensed plumber or a licensed HVAC contractor. If the manufacturer gives no clearances, the city requires at least 10 feet from structures and combustibles.

Is there a rebate for replacing lawn?

Fort Collins Utilities runs the Xeriscape Incentive Program for its water customers, offering a per-square-foot rebate for replacing grass with an eligible low-water landscape. Projects must be approved before any turf is removed, and the city's program page lists current rates, deadlines and when residential applications are open. The program is built around low-water planting, so ask XIP staff whether any patio area counts before you plan a budget around it.

How do I check a contractor?

The City of Fort Collins says its contractor licensing applies to contractors working in the city, along with a city business license, and it publishes the license categories online. Ask what license or registration the contractor holds, and confirm with the city's Contractor Licensing office if you're unsure. For gas work, confirm the plumber or HVAC contractor's license.

Questions to ask a contractor

What city license or registration do you hold?
How deep will the base be, and how will you compact it on clay?
How will water drain away from the house and the patio edges?
What edge restraint will you use?
Who requests the 811 locate, and who pulls any permits?
What does your warranty cover, and for how long?

Common questions

Do I need to call 811 for a patio in Colorado?

Yes. Colorado 811 says all property owners must request a locate before digging at any depth, with at least two full business days' notice.

How tall can a retaining wall be without a permit in Fort Collins?

Up to 4 feet from the low-side grade to the top, without a surcharge. Taller walls need a permit and a stamped engineered design.

Are wood-burning fire pits allowed in Fort Collins?

Permanent wood-burning fire pits aren't allowed in city limits. Gas fire pits are allowed with a permit and inspections.

Fort Collins paver patio guide (2026)