Deck Permit in Jefferson County, Colorado
By Mario Bailey Last checked 2026-07-06 · 1 official source
Verified against official sources Confirmed on official pagePermit required
Quick answer
A Building Permit is required for every new deck, deck expansion, replacement deck, and deck repair in unincorporated Jefferson County, regardless of height above grade. Only a ground-level concrete pad, rather than an elevated deck, avoids the permit. Decks may also trigger Defensible Space or Structure Hardening review in the Wildland Urban Interface, and grading more than a half acre can trigger a separate Grading Permit.
Typical threshold: No exemption by height or size: a Building Permit is required for new decks, deck expansions, replacement decks, and deck repairs. Only a ground-level concrete pad, rather than an elevated deck, avoids the permit.
Who is pulling this permit?
Apply yourself
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Before you sign, ask the contractor:
- Who pulls the permit, you or me, and is the permit fee included in the bid?
- Which inspections will this job need, and who meets the inspector on site?
- Is your contractor license active in this locality, and under which business name?
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When a permit is usually needed
Before building, expanding, replacing, or repairing any residential deck
What deck permit costs in Jefferson County
Billed as a building permit on the county valuation fee table starting at a $55 minimum for the first $1,000 of value plus a 65% plan review fee, per the 2024 Building Code Supplements fee schedule effective 7/1/2026.
How Jefferson County compares in Colorado
| Jurisdiction | Permit needed? | Threshold |
|---|---|---|
| Denver | It depends | uncovered decks under 12 in off the ground require no permit; 12 in or more requires a zoning permit; 30 in or more also requires a building permit |
| Jefferson Countythis page | Permit required | No exemption by height or size: a Building Permit is required for new decks, deck expansions, replacement decks, and deck repairs. Only a ground-level concrete pad, rather than an elevated deck, avoids the permit. |
How to apply in Jefferson County
A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs.
What most deck permit applications include:
- A permit application identifying the work, the deck's size (square footage), and whether electrical work such as lights or receptacles is included, submitted for plan review before construction begins (IRC R106).
- A scaled site plan (for example 1/4 inch to 1 foot) showing the new deck's location relative to the house, its overall length and width, and dimensioned distances from the deck to all property lines and other structures so required setbacks can be verified (IRC R106.1.1).
- A deck plan drawn to scale showing overall dimensions and the framing layout: joist size, spacing, span, and species; beam size and span; post size and height; and footing or pier size and depth (IRC R507.4 posts, R507.5 beams, R507.6 joists, R507.3 footings).
- A section or side elevation with connection details showing the ledger attachment to the house band joist with flashing, the fastener or bolt schedule, joist hangers, post-to-beam and post-to-footing connections, and the required lateral load connection (IRC R507.9 ledger connection, R507.9.2 lateral connection, R507.2.4 flashing).
- Footing sizing derived from tributary area, the soil bearing value, and design loads per IRC Table R507.3.1, with footings shown bearing on undisturbed soil at the frost depth required by the jurisdiction (IRC R507.3).
- Details for the guards required where the walking surface is more than 30 inches above grade, and for the stairs and handrails, showing guard height and opening limits, stair riser and tread dimensions, and handrail location (IRC R312 guards, R311.7 stairs and handrails).
- For designs that fall outside the prescriptive R507 tables (for example multi-story or stacked decks, or a ledger attached to a cantilever), engineered and stamped structural plans are submitted in place of the prescriptive details (IRC R507.1 and R301).
General submittal guidance from IRC R106.1.1 (construction documents) and IRC R507 (exterior decks), 2021 IRC. Source. Jefferson County Planning & Zoning Division sets the exact checklist for Jefferson County.
Where to apply in Jefferson County:
Jefferson County Planning & Zoning Division
- 100 Jefferson County Parkway, Suite 3550, Golden, CO 80419
- Phone: 303-271-8700
Inspections and closing out your permit
Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
- Footing or pier inspection: after the holes are dug and any forms or reinforcing are set but before concrete is placed, the inspector checks footing depth and diameter, a flat undisturbed bearing surface, and that the holes are free of water (IRC R109.1.1 foundation inspection; R507.3 footings).
- Framing inspection: after the deck is framed but before the decking conceals it, the inspector verifies the ledger attachment and its flashing, the fastener and bolt schedule, joist hangers and metal connectors, post-to-beam and post-to-footing connections, and the lateral load connection; call it before decking is installed (IRC R109.1.4 frame inspection; R507.9 ledger and flashing).
- Final inspection: after the deck is complete and before it is used, the inspector confirms guard height and opening limits (a 4 inch sphere must not pass, 4 3/8 inch at stairs), stair riser and tread dimensions, handrail height and graspability where there are 4 or more risers, stair landings, and required stair lighting (IRC R109.1.6 final inspection; R312 guards, R311.7 stairs and handrails).
Schedule each inspection in advance and pass the final before you use the work or close the permit. Request inspections through the Jefferson County permit portal or by phone at 303-271-8700.
Inspection sequence from IRC R109 (inspections: R109.1.1 footing before concrete, R109.1.4 frame, R109.1.6 final), 2021 IRC. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Deck Permit checklist for Jefferson County
- Confirm the requirement. Yes, a permit is required. Typical threshold: No exemption by height or size: a Building Permit is required for new decks, deck expansions, replacement decks, and deck repairs. Only a ground-level concrete pad, rather than an elevated deck, avoids the permit. Usually needed: Before building, expanding, replacing, or repairing any residential deck.
- Budget the fee. Billed as a building permit on the county valuation fee table starting at a $55 minimum for the first $1,000 of value plus a 65% plan review fee, per the 2024 Building Code Supplements fee schedule effective 7/1/2026. Official fee schedule.
- Apply. A residential deck permit application is a set of construction documents that show what will be built and prove it meets the IRC deck provisions. In practice that means a scaled site plan locating the deck and its setbacks, plus deck plans and structural details covering the footings, posts, beams, joists, ledger, guards, and stairs. Start at the Jefferson County permit portal.
- Keep the office details handy. Jefferson County Planning & Zoning Division. Phone: 303-271-8700. Address: 100 Jefferson County Parkway, Suite 3550, Golden, CO 80419.
- Plan for inspections. Deck work is inspected in sequence as it is built: the footings before concrete is placed, the framing before the decking boards go down, and a final inspection once the deck is complete. Each stage checks the items that would be hidden or unsafe if missed.
Compiled from the official sources on this page. Last checked 2026-07-06.
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Frequently asked questions
- Do you need a deck permit in Jefferson County?
- A Building Permit is required for every new deck, deck expansion, replacement deck, and deck repair in unincorporated Jefferson County, regardless of height above grade. Only a ground-level concrete pad, rather than an elevated deck, avoids the permit. Decks may also trigger Defensible Space or Structure Hardening review in the Wildland Urban Interface, and grading more than a half acre can trigger a separate Grading Permit. Always confirm with the Jefferson County Planning & Zoning Division before starting.
- How much does a deck permit cost in Jefferson County?
- Billed as a building permit on the county valuation fee table starting at a $55 minimum for the first $1,000 of value plus a 65% plan review fee, per the 2024 Building Code Supplements fee schedule effective 7/1/2026. See the official fee schedule for current amounts.
- Where do you apply for a deck permit in Jefferson County?
- You can apply through the Jefferson County permit portal or contact the Jefferson County Planning & Zoning Division directly. The links are listed on this page.
From the Library
What else needs a permit in Jefferson County
Every other permit type we have verified for this jurisdiction, with the rule that applies here.
| Project | Permit needed? | Threshold | Typical fee |
|---|---|---|---|
| Electrical Permit | Permit required | Not specified | Electrical permits not tied to an active building permit bill on the countywide valuati... |
| Fence Permit | No permit needed | Not specified | No permit for fences in unincorporated Jefferson County; |
| HVAC Permit | Permit required | Not specified | Mechanical permits not tied to an active building permit bill on the countywide valuati... |
| Patio Permit | It depends | Ground-level concrete or paver patios are treated like the exempt concrete pads on the Decks page and do not need a Building Permit; patio covers, roofed patio structures, and patio enclosures (anything that adds a roof or walls) need a Building Permit. | Not published |
| Plumbing Permit | Permit required | Not specified | Plumbing permits not tied to an active building permit bill on the countywide valuation... |
| Pool Permit | Permit required | A Miscellaneous Permit is required for swimming pools of any size, in-ground or above-ground, and related structures such as diving boards and ladders; hot tubs and swim spas do not need this permit. Any electrical work for the pool needs a separate Building Safety electrical permit. | Pools of any size need a Miscellaneous Permit priced at $90 on the 2026 zoning fee tabl... |
| Roof Replacement Permit | Permit required | A Building Permit is required for full roof replacement. Only minor roof repairs affecting less than 25% of the total roof area and no more than 2 squares are exempt; anything larger needs a permit plus a mid-roof and a final inspection. | Full roof replacement bills as a building permit on the countywide valuation fee table... |
| Shed Permit | Permit required | Sheds, mini-structures, and shipping containers 120 sq ft or less that sit at least 10 feet from any occupied structure and are no more than 14 feet tall need only a Miscellaneous Permit; anything larger, taller, or closer than 10 feet to an occupied structure needs a full Building Permit instead. Some permit is required at every size. | Sheds 120 sq ft or less and at least 10 feet from an occupied structure need only a $90... |
| Solar Permit | Permit required | Roof-mounted solar panels flush against the roof need no Planning and Zoning permit but always need an Electrical Permit. Panels raised up to 5 feet above the roof need a Miscellaneous Permit from Planning and Zoning in addition to the Electrical Permit. Ground-mount and commercial grid-sale systems have additional requirements. | Solar permit fees are capped at $500 for residential systems, per the county Building P... |
Deck Permit in other Colorado localities
Official sources
Verified by a person against the sources above on 2026-07-06, not confirmed with Jefferson County Planning & Zoning Division. Rules change; confirm before you build. How we verify.
Last checked: 2026-07-06Report an error on this page
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