New deck construction in Fort Collins
Attached decks, freestanding platforms and decks off a walkout basement, designed around Northern Colorado clay, frost and sun.
A new deck in Fort Collins is a small structure with its own foundation, framing and inspections. For homeowners in Fort Collins, Loveland, Windsor and Timnath, the result should be a deck that stays level on expansive clay, passes the city's inspections the first time, and suits how you actually use the yard.
What goes into a new deck?
- Piers to the right depth. Fort Collins requires 30-inch-deep footings for decks attached to the house and 12 inches for freestanding decks. The city's chart sizes the pier by how much deck each one carries, from an 8-inch round pier for 5 square feet of tributary area up to 31 inches for 160 square feet.
- A ledger tied into the house. The ledger bolts through the rim board and is flashed so snowmelt can't run behind it. Decks hung off a cantilevered bump-out, like a bay window, need engineered details in Fort Collins.
- Framing and connectors. Joists, beams and hangers sized for the span and rated for treated lumber. Beams carried by hangers, including beam-to-beam connections, call for an engineer's letter.
- Decking, guards and stairs. Wood or composite boards on top, plus rails and stairs built to the code dimensions the inspector will check.
- Five inspection stages. Setbacks and footings before concrete, the post connections, rough framing before boards go down, any electrical, and a final.
When does it make sense to build new?
- The house has a door to nowhere, or a slider that steps down onto dirt or a cracked slab
- A walkout basement leaves the main floor 8 to 10 feet above the yard
- An old patio has heaved and you'd rather float a low deck over that area
- You want a level spot for a grill, a table, or a future hot tub
Why the ground here matters
The Colorado Geological Survey says swelling clay soils cause more property damage in the state than any other natural hazard, and it points to poor drainage and irrigation water near foundations as common triggers. For a deck, that means paying attention to where gutters and sprinkler heads empty, keeping water from ponding around piers, and asking whether your lot has a soils report from when the house was built. In Fort Collins, the city's pier chart assumes 1,500 psf soil bearing, and Larimer County requires a design professional to justify anything higher on the Front Range.
Height, egress and lighting details
Fort Collins adds a few rules that catch people out. If a basement egress window sits under the deck, the guide asks for 36 inches of clear height from the top of the window well to the underside of the deck. A wet-listed light is required at the top landing, and new fixtures must be shielded and aimed down or dark-sky compliant. Attached decks with a walking surface 10 feet or more above grade need cross-bracing under Larimer County's handout, and the city requires engineering for diamond piers on decks over 10 feet to the top of the beam.
What affects the price?
- Square footage, height, and the number of levels and stairs
- How many piers the layout needs and how hard the digging is
- Decking and railing material
- Engineering, if the design includes a hot tub, a pergola on the deck, or stacked decks
- Removing an old deck or patio, and access for equipment to the backyard
A contractor prices a new deck after measuring the site and talking through materials. We don't set or quote prices, so treat any figure before that visit as a ballpark.
Freestanding or attached?
A freestanding deck carries itself on its own beams and posts, which skips the ledger connection and, in Fort Collins, allows shallower footings. It costs more in posts and beams, and it can still need a permit if it is over 30 inches high or larger than 200 square feet. An attached deck shares the house's support on one side but has to be bolted and flashed correctly. Your contractor can show you which fits the house.
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Common questions
How deep are deck footings in Fort Collins?
The city deck guide calls for at least 30 inches below grade for decks attached to the house and at least 12 inches for freestanding decks.
Can a new deck hold a hot tub?
It can if it is designed for one. Fort Collins requires engineered, stamped plans or letters for decks that support a hot tub or pool.
Do I need a permit for a small ground-level deck?
Not always. A freestanding deck under 30 inches high and no larger than 200 square feet that doesn't serve the front door may not need a city permit, but confirm with Fort Collins before you build.
Related services
Permits, frost depth and soils: Larimer County deck guide.
Ready to talk through a new deck or a repair?
Call and we'll connect you with a contractor who works in your part of Northern Colorado.