Plumbing Permit in Jefferson County, Colorado
Permit required
Yes, a permit is required
For work that alters water supply, drainage, or vent systems, and for new fixture or water heater installations
Issued byJefferson County Division of Building Safety
By Mario Bailey, verified against official sources
Quick answer
Jefferson County Building Safety issues Plumbing Permits as one of its standard permit categories; water heater plumbing permits can be applied for online, and the building code supplement confirms separate plumbing permits are required even for structures exempt from a Building Permit. Stand-alone plumbing permits not tied to an active building permit are addressed directly in the county's Plumbing Code Supplement.
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When a permit is usually needed
For work that alters water supply, drainage, or vent systems, and for new fixture or water heater installations
What a plumbing permit costs in Jefferson County
How Jefferson County compares in Colorado
No Colorado jurisdiction we have verified sets a size threshold for this permit, so what actually differs between them is the fee.
| Jurisdiction | Permit needed? | Typical fee |
|---|---|---|
| Aurora | It depends | On the 2026 flat-rate schedule (Form #A175, footer "Flat-Rate Fee (Revised... |
| Denver | Permit required | Valuation-based fee per CPD Table 1 with a $20 minimum |
| Jefferson Countythis page | Permit required | Plumbing permits not tied to an active building permit bill on the countywide... |
How to apply in Jefferson County
In Jefferson County, you apply for a residential plumbing permit at your local building department by filing an application that describes the scope of work and site, along with construction documents, before any regulated plumbing installation, alteration, or repair begins. Minor repairs that do not touch piping or fixtures are generally exempt, and once issued the permit only stays valid if work is started within its time limit.
What most plumbing permit applications include:
- For Jefferson County, a permit is required before any owner or authorized agent constructs, alters, repairs, removes, converts, or replaces a plumbing system regulated by the code (IRC R105.1).
- For Jefferson County, the application must identify and describe the work, describe the site, state the intended use and occupancy, and be signed by the applicant or an authorized agent (IRC R105.3).
- Two or more sets of construction documents must accompany the application, drawn with enough clarity to show the location, nature, and extent of the proposed plumbing work and how it will conform to code (IRC R106.1, R106.1.1).
- Minor plumbing repairs, such as clearing a stoppage or removing and resetting a water closet without rearranging pipes or fixtures, are exempt from permit (IRC R105.2).
- Once issued, a permit is only valid for a limited window, commonly 180 days, and becomes invalid if the work is not started or is abandoned within that time, though extensions can be requested (IRC R105.3.2, R105.5).
General submittal guidance from 2021 International Residential Code (IRC), Chapter 1 Scope and Administration, Sections R105 Permits and R106 Construction Documents. Source. Jefferson County Division of Building Safety sets the exact checklist for Jefferson County.
Where to apply in Jefferson County:
Jefferson County Division of Building Safety
- 100 Jefferson County Parkway, Suite 3540, Golden, CO 80419
- Phone: 303-271-8260
Plumbing Permit in Jefferson County compared with nearby Colorado localities
| Locality | Permit needed? | Threshold | What each Colorado schedule says | Verified |
|---|---|---|---|---|
| Jefferson County | Permit required | Not specified | Plumbing permits not tied to an active building permit bill on the countywide valuation... | |
| Aurora | It depends | Not specified | On the 2026 flat-rate schedule (Form #A175, footer "Flat-Rate Fee (Revised 08/2026)")... | |
| Denver | Permit required | Not specified | Valuation-based fee per CPD Table 1 with a $20 minimum |
Inspections and closing out your permit
In Jefferson County, plumbing inspections are timed to whatever is about to hide the pipe: underground and under-slab piping is checked before concrete covers it, rough-in piping is pressure or water tested before walls close up, and a final inspection checks every fixture and backflow protection once the work is complete.
- In Jefferson County: piping and equipment placed under a slab or floor must be in place and inspected before any concrete is poured or floor sheathing is installed over it (IRC R109.1.1.1).
- In Jefferson County: rough plumbing, along with the mechanical, gas, and electrical rough-in, must be inspected prior to covering or concealment and before fixtures or appliances are set (IRC R109.1.2).
- In Jefferson County: rough drain, waste, and vent (DWV) piping is tested with water, air, or (for plastic piping) a vacuum, and must show no evidence of leakage before it is closed in (IRC P2503.5.1).
- In Jefferson County: the water-distribution piping is tested and must hold tight under the system's working pressure, or under a 50 psi air test for non-plastic piping, before it is concealed (IRC P2503.7).
- In Jefferson County: the framing inspection cannot proceed until the plumbing rough inspection, along with the mechanical and electrical rough inspections, has been approved (IRC R109.1.4).
- In Jefferson County: at the final drainage test, each fixture is filled and then drained, and its traps and fixture connections must prove watertight by visual inspection (IRC P2503.5.2).
- In Jefferson County: final inspection is made after all work required by the permit is complete, and includes confirming backflow protection, such as vacuum breakers on hose bibbs, is installed (IRC R109.1.6, P2902.4.3).
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 303-271-8260.
Inspection sequence from 2021 International Residential Code (IRC), Section R109 Inspections and Section P2503 Inspection and Tests. Source. An open permit left un-inspected can surface later in a title search or home sale.
Your Plumbing Permit checklist for Jefferson County
- Confirm the requirement. Yes, a permit is required. Usually needed: For work that alters water supply, drainage, or vent systems, and for new fixture or water heater installations.
- Budget the fee. Plumbing permits not tied to an active building permit bill on the countywide valuation fee table with a $55 minimum for the first $1,000 of value, per the 2024 Building Code Supplements fee schedule effective 7/1/2026. Official fee schedule.
- Apply. In Jefferson County, you apply for a residential plumbing permit at your local building department by filing an application that describes the scope of work and site, along with construction documents, before any regulated plumbing installation, alteration, or repair begins. Minor repairs that do not touch piping or fixtures are generally exempt, and once issued the permit only stays valid if work is started within its time limit. Start at the Jefferson County permit portal.
- Keep the office details handy. Jefferson County Division of Building Safety. Phone: 303-271-8260. Address: 100 Jefferson County Parkway, Suite 3540, Golden, CO 80419.
- Plan for inspections. In Jefferson County, plumbing inspections are timed to whatever is about to hide the pipe: underground and under-slab piping is checked before concrete covers it, rough-in piping is pressure or water tested before walls close up, and a final inspection checks every fixture and backflow protection once the work is complete.
Compiled from the official sources on this page. Last checked .
Frequently asked questions
- Do you need a plumbing permit in Jefferson County?
- Jefferson County Building Safety issues Plumbing Permits as one of its standard permit categories; water heater plumbing permits can be applied for online, and the building code supplement confirms separate plumbing permits are required even for structures exempt from a Building Permit. Stand-alone plumbing permits not tied to an active building permit are addressed directly in the county's Plumbing Code Supplement. Always confirm with the Jefferson County Division of Building Safety before starting.
- How much does a plumbing permit cost in Jefferson County?
- Plumbing permits not tied to an active building permit bill on the countywide valuation fee table with a $55 minimum for the first $1,000 of value, 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 plumbing permit in Jefferson County?
- You can apply through the Jefferson County permit portal or contact the Jefferson County Division of Building Safety directly. The links are listed on this page.
- Can a homeowner pull a plumbing permit themselves in Jefferson County?
- Under Colorado law (C.R.S. 12-115-116(2); C.R.S. 12-115-120(11)(c); C.R.S. 12-155-118(2); C.R.S. 12-155-120(11)(c)): Colorado's state electrical law has a homeowner exception: under C.R.S. 12-115-116(2), you do not need an electrician's license to do electrical work on your own property or residence, as long as all the work, other than maintenance or repair of existing systems, is inspected under the state law. The exception does not apply if the property is intended for sale or resale by someone in the construction or remodeling business, is rental property, or is generally open to the public. A homeowner performing work on the homeowner's home is a qualified applicant who may pull the state electrical permit under C.R.S. 12-115-120(11)(c), and plumbing mirrors this: C.R.S. 12-155-118(2) allows unlicensed plumbing work on your own property or residence with the same carve-outs, and C.R.S. 12-155-120(11)(c) lets a homeowner pull the state plumbing permit. The State Electrical and Plumbing Boards at DORA require that the homeowner personally perform the work, that it be inspected before cover and again at completion, and that it meet the National Electrical Code or the adopted plumbing codes. Colorado has no statewide general contractor license: Title 12 licenses electricians and plumbers at the state level, and general building contractors are licensed, if at all, by the individual city or county. Confirm how Jefferson County applies this before you apply.
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 |
|---|---|---|---|
| Deck Permit | 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. | Billed as a building permit on the county valuation fee table starting at a $55 minimum... |
| Electrical Permit | Permit required | Not specified | Electrical permits not tied to an active building permit bill on the countywide... |
| 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... |
| 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 |
| 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 table... |
| 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... |
Plumbing Permit in other Colorado localities
Everything above, sourced
Code references
National and state model-code sections the general guidance on this page is drawn from. They are not Jefferson County documents; the office above sets the local rules.
How this plumbing permit page for Jefferson County was verified. 2 official sources: jeffco.us, jeffco.us; fee schedule: official document. Last checked by Mario Bailey, not confirmed with Jefferson County Division of Building Safety. Rules change; confirm before you build. How we verify.
Last checked: Report an error on this page
Compare Plumbing Permit requirements across Colorado localities