Deck Building in Byers, CO

Deck building in Byers runs through Arapahoe County’s Building Division using a guide built jointly with the Colorado Chapter of the International Code Council, based on the 2021 IRC with county amendments. The guide is detailed on framing, footings, and guardrails, but it doesn’t spell out a simple height-based permit exemption, so we treat an attached or elevated deck in Byers as a permitted project by default rather than guessing at an exemption that isn’t clearly written down.

The County Reviews Decks Against a Detailed Prescriptive Guide

Arapahoe County’s Single Family Residential Uncovered Decks and Porches guide asks for a plot plan showing the deck’s dimensions and its relationship to the existing house and property lines, along with a deck section drawing that specifies decking type, joist size and spacing, beam size, post size and spacing, and wood species. That level of detail has to be filled in before the county will review the application.

We complete that plan set against the actual house and yard rather than a generic template, because the guide’s own span and connection tables only work correctly once real joist spans, beam spans, and post heights are filled in for the specific deck being built.

Footings Have to Clear Frost Depth

The guide requires piers at least 8 inches in diameter, with anchor bolts embedded a minimum of 7 inches into the concrete pier or an approved equivalent. Post bases need to sit at least 6 inches below finished grade and below frost depth; if the post is less than 6 inches below grade, it has to be decay-resistive material instead.

Frost depth on the eastern plains isn’t always identical to what a Front Range suburb crew is used to, so we confirm the applicable depth with the Building Division for the specific Byers site rather than assuming a standard number carries over unchanged.

Ledger Attachment Depends on Joist Span

A deck ledger attached to the house has to be a minimum 2×8 pressure-treated piece in hem-fir, Douglas fir, or southern pine grade #2 or better, and it can’t be supported by stone or masonry veneer or attached to a cantilevered floor. The guide’s lag-screw and bolt spacing table sets on-center fastener spacing by joist span, for example a half-inch lag screw needs spacing from about 10 inches on-center at longer joist spans down to 30 inches on-center at shorter ones, with approved flashing required behind the ledger.

We size that connection to the actual joist span planned for the deck, not a rounded-up guess, since undersizing the ledger connection is one of the more common reasons a deck plan gets sent back for correction.

Guardrails Are Required Once the Deck Clears 30 Inches

A guardrail is required wherever the deck or porch surface is more than 30 inches above grade, with a minimum height of 36 inches and open members spaced so a 4-inch-diameter sphere can’t pass through. Stairways need to be at least 36 inches wide, with a maximum 7¾-inch rise, a minimum 10-inch tread run, and no more than ⅜ inch of variation across the full run of the stair.

Handrails are required on stairs with 4 or more risers, set 34 to 38 inches above the stair nosing, with a graspable cross-section between 1¼ and 2¼ inches and at least 1½ inches of clearance from any adjacent wall. We build the rail and stair layout into the framing plan from the start instead of treating it as trim work added at the end.

Snow Load and Wood Species Affect the Span Tables

The guide’s joist and beam span tables are built around a 40 psf live/snow load and 10 psf dead load, using southern pine or Douglas fir-larch/hem-fir/spruce-pine-fir grade #2 or better lumber. The guide notes that jurisdictions with snow loads exceeding 40 psf should be contacted directly, and other wood species or engineered lumber fall outside the guide entirely and need separate review by the Authority Having Jurisdiction.

Open plains exposure in Byers can mean different snow-drift behavior around a structure than a sheltered suburban lot sees, so we confirm the applicable design snow load for the property rather than defaulting to the guide’s baseline number without checking.

Cantilever Attachments Need Engineering Sign-Off

Any deck ledger or beam connection that attaches to a cantilevered floor in the existing house requires an engineer’s approval before the county will accept the plan. That’s a separate step from the standard prescriptive tables the guide otherwise allows for a typical ledger-to-rim-joist connection.

Older Byers farmhouses sometimes have additions or cantilevered bay sections that weren’t built with a future deck attachment in mind, so we check the framing at the proposed attachment point before assuming a standard ledger connection will be accepted.

How We Sequence a Byers Deck Project

The sequence starts with a site visit to measure the house, yard, and existing grade, followed by a plan set built to the county’s guide, including joist span, beam size, post spacing, and ledger connection detail specific to the property. The permit is filed with that plan set before any digging begins.

Pier and post footings go in first, sized to clear frost depth, followed by ledger attachment, framing, and decking. Guardrails, stairs, and handrails are built into the framing sequence rather than added afterward, and the project closes with a final inspection confirming the completed structure matches the approved plan.

Common Questions

Does a deck in Byers need a permit from Arapahoe County?
The county’s deck guide does not spell out a clear no-permit height threshold, so we treat an attached or elevated deck as a permitted project and confirm the specific threshold with the Building Division before assuming an exemption applies.

How deep do deck footings need to go in Byers?
Post bases need to sit at least 6 inches below finished grade and below frost depth, with piers at least 8 inches in diameter; the exact frost depth for a specific Byers site should be confirmed with the county.

When does a deck need a guardrail?
A guardrail is required once the deck or porch walking surface is more than 30 inches above grade, with a minimum 36-inch height and openings that don’t allow a 4-inch-diameter sphere to pass through.

Do all wood species work with the county’s span tables?
No. The prescriptive tables cover southern pine and Douglas fir-larch/hem-fir/spruce-pine-fir grade #2 or better; other species and engineered lumber require separate review by the Authority Having Jurisdiction.

Talk to Us About Your Project

Tell us your planned deck size, height above grade, and how it will attach to your home, and we’ll walk through what Arapahoe County’s deck guide requires for footings, framing, and rails on your Byers property.