Deck Building in Franktown, CO

Douglas County publishes its own deck permit page and a dedicated Single-Family Residential Decks and Porches Building Guide, which makes a deck one of the more clearly documented project types for a Franktown address. Even so, several of the specific numeric triggers a homeowner might expect, such as an exact exempt size or a published guard-height figure, are not spelled out on the pages we were able to review, so we treat those as confirm-with-the-county items rather than assumptions.

Decks Are a Named, Reviewed Permit Category

Douglas County treats decks as their own permit category, separate from a general building alteration permit, and publishes a specific submittal checklist and building guide for single-family residential decks and porches. We were not able to confirm the exact threshold, whether by height, square footage, or attachment to the house, at which a small deck becomes permit-exempt from the county’s own published materials, so we do not state a specific exempt size here. Before framing a deck of any size in Franktown, we confirm with the Building Division whether the specific project needs a permit.

What the County Wants to See in a Submittal

Douglas County’s deck submittal checklist calls for a site or plot plan showing the house, property lines, and all improvements with dimensions to the property lines, plus deck plans drawn to scale showing every dimension. Structural framing plans need to show lumber species and size, caisson footing size and spacing, posts, beams, joists, and the ledger attachment detail. The property owner or permit holder is responsible for verifying the location of every utility and easement, including water, sewer, well, septic, electric, phone, cable, fiber optic, and gas, before any excavation or construction begins.

Footing Depth Follows the County’s Frost Line

Douglas County’s Design Information page sets a minimum frost depth of 36 inches, which applies to foundations and footings across the county, including deck footings. We design caisson and footing depth on a Franktown deck to that 36-inch minimum as a baseline, and adjust for any site-specific condition, such as expansive soil or unusual grade, that the county’s guidance or a geotechnical report calls for.

Guard and Stair Details Are Confirmed Against the Adopted Code

A guard-height trigger and stair handrail requirement apply to most elevated decks under the residential code, but we were not able to confirm the county’s own published figures for these from the pages we reviewed. Rather than repeat a generic number that may not match Douglas County’s currently adopted IRC edition, we confirm the exact guard-height trigger and stair handrail requirements directly against the county’s adopted code and the residential deck building guide with the Building Division before finalizing framing and rail layout, and we design the framing with rail post and stair locations in mind from the start so nothing needs to be reworked later.

Setbacks and How Far a Deck Can Reach

Consistent with the general setback rules already documented for Franktown’s outlying residential districts, a covered or uncovered deck or porch may project 6 feet into a required setback, except into a side setback. That gives some flexibility for a deck to reach closer to a street or rear line than the main structure could, but the side setback stays a hard line. We check the buildable area against the parcel’s specific zoning district before laying out footings, since setback distances scale with lot size across the county’s RR, ER, and SR districts.

Soil Conditions Behind the Footings

Douglas County’s documented expansive soil conditions, already noted for basement and addition work, are relevant to deck foundations as well, particularly where a ledger ties into the house or a footing sits near a foundation wall. We do not assume a site is stable simply because a neighboring deck has held up over the years; where the scope reaches structural connections or unusual grade, a site-specific geotechnical opinion is the way to confirm footing design rather than build on a general assumption.

How We Sequence a Franktown Deck

We start by confirming the buildable area against the parcel’s zoning setbacks, preparing the plot plan and structural framing plan the county’s checklist calls for, and confirming current guard-height and stair requirements against the county’s adopted code before framing begins. Contractor registration is confirmed for the crew under the county’s General classification before the permit is filed.

Footings are dug to the confirmed depth and inspected before backfill, framing follows with ledger, joist, and beam sizing matched to the approved plan, and stair and guard details are built to the confirmed requirements rather than a generic figure. We keep the field layout consistent with the approved plan throughout, and if grade or stair placement shifts during construction, we re-check that against the original setback and guard-height confirmation before proceeding.

Common Questions

Does every deck in Franktown need a Douglas County permit?
Decks are their own named permit category with a dedicated submittal checklist and building guide. We were not able to confirm a specific exempt size from the county’s published materials, so we confirm with the Building Division whether a given deck needs a permit before starting.

How deep do deck footings need to go in Franktown?
Douglas County’s Design Information page sets a minimum frost depth of 36 inches, which applies to footings county-wide, including deck footings. We use that as the baseline and adjust for site-specific soil conditions.

What guard height applies to my Franktown deck?
We could not confirm a specific guard-height figure on the county’s own published pages, so we confirm the current requirement against Douglas County’s adopted residential code and the deck building guide before finalizing rail and stair framing, rather than assume a number that may not match the current edition.

How far can a deck extend into my setback?
Consistent with the general setback rules for Franktown’s outlying residential zoning districts, a covered or uncovered deck or porch may project 6 feet into a required setback, except into a side setback. The buildable area still depends on the parcel’s specific zoning district.

Talk to Us About Your Project

Tell us the size, location, and height you have in mind for your Franktown deck, along with any grade change or drainage feature nearby. We will outline the county’s permit steps and a buildable sequence for the project.