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Residential Addition / Alteration Permit (RADD / RALT) in Commerce City, Colorado

Required for additions, garages, decks, patio covers, sunrooms, second-story additions (pop-tops), basement finishes, interior remodels, and similar work on existing houses in Commerce City. Reviewed against the 2021 IRC as adopted by the C3BC. Billed on the same valuation-based Table 1-A fee schedule as new construction.

Verified 2026-07-13 · Source

When you need this permit

  • Residential Addition (RADD) covers additions, decks, garages, patio covers, barns, sunrooms, second-story additions (pop-tops), and additions that include interior alterations to existing areas
  • Residential Alteration (RALT) covers basement finishes, interior remodels, truss repairs, foundation repairs, fireplaces, woodstoves, new stairways, and basement egresses
  • Minimum submission documents: building plans, site-related/plot plan showing construction location and landscaping, evaluation report for patio covers or other unique materials, RESCheck printout if not using prescribed energy conservation measures, and a construction cost breakdown (materials and labor)
  • Patio covers must be one story with a minimum of 65% of the longest wall and one adjacent wall glazed, screened, or open; less than 65% openings is treated as an addition subject to stricter wall-bracing requirements
  • For garages: 1/2-inch drywall on walls and 5/8-inch Type-X on ceilings; 20-minute fire-rated door between an attached garage and house; detached garages within 3 feet of the house need the same fire separation as attached garages; garage outlets must be GFCI with at least one outlet and one switched ceiling light
  • Maximum building height for additions/sunrooms/patio covers is 35 feet measured from grade to roof midpoint

Required documents

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Fee schedule

Building Permit Fee (Table 1-A) — valuation $1.00 to $500.00Same valuation-based Table 1-A schedule used for all permit types; Directory of City Fees, Section 2 (PDF)
$30.41
Building Permit Fee (Table 1-A) — valuation $2,001 to $25,000
$89.60 for the first $2,000.00 plus $18.11 for each additional $1,000.00 or fraction thereof
Plan Review Fee$150.00 flat fee if identical plans are re-submitted
65% of the Building Permit Fee

Review timeline

Plan reviewCommerce City’s published plan-review target
14–14 business days

How long did your Residential Addition / Alteration Permit (RADD / RALT) permit actually take in Commerce City?

Anonymous — one question, no email. Answers are combined and only shown once at least 5 people have reported.

Inspection process

  1. 1

    Foundation (if new footings)

    Before concrete pour for new footings, deck posts, or garage foundations

  2. 2

    Framing

    Structural framing and connection to existing structure

  3. 3

    MEP Rough-In

    Electrical, plumbing, mechanical rough-in before walls closed

  4. 4

    Final

    All work complete per approved plans

See the full Commerce City inspection guide — scheduling & re-inspection fees →

Tips

  • Basement finishes have their own dedicated design guide (Basement Finishes) separate from the general Additions/Garages guide -- check the correct checklist for your project type.
  • Patio covers need at least 65% glazing/screening/openness on the longest wall plus one adjacent wall to avoid being reclassified as a stricter 'addition' for wall-bracing purposes.
  • Enclosing an existing patio cover requires an evaluation report and is frequently prohibited outright -- check with Building Safety before planning this conversion.

Frequently asked questions

Yes. Basement finishes fall under the Residential Alteration (RALT) permit type and require a permit, submitted electronically through eTRAKiT with building plans meeting the Basement Finishes design guide checklist.

In Commerce City, the published Building Permit Fee (Table 1-A) — valuation $1.00 to $500.00 is: $30.41. Additional published fees: Building Permit Fee (Table 1-A) — valuation $2,001 to $25,000 — $89.60 for the first $2,000.00 plus $18.11 for each additional $1,000.00 or fraction thereof; Plan Review Fee — 65% of the Building Permit Fee. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Commerce City's published plan-review target for a residential addition / alteration permit (radd / ralt) is 14–14 business days.

You'll need: Building Plans; Site/Plot Plan; Construction Cost Breakdown. Depending on your project, Commerce City may also ask for: Evaluation Report. See the required-documents checklist on this page for details on each.

Commerce City requires 4 inspection(s) for a residential addition / alteration permit (radd / ralt), in order: Foundation (if new footings), Framing, MEP Rough-In, Final. Schedule each through Commerce City Building Safety Division (Community Development Department) (303-289-3790).

Apply through Commerce City Building Safety Division (Community Development Department) at South Platte Crossing Building, 7190 Colorado Blvd. Ste 600 (6th Floor), Commerce City, CO 80022. Phone: 303-289-3790, email: cdpermits@c3gov.com. Office hours: Monday - Friday, 8:00 a.m. - 5:00 p.m.. Official information: https://www.c3gov.com/Business-Development/Building-Permits-Inspections.

Commerce City, Colorado has adopted: City of Commerce City Building Code (C3BC), also known as the 2021 edition of the C3BC — incorporates by reference: 2021 International Building Code (IBC), 2021 International Existing Building Code (IEBC), 2021 International Residential Code (IRC), 2021 International Energy Conservation Code (IECC), 2021 International Fuel Gas Code (IFGC), 2021 International Mechanical Code (IMC), 2021 International Plumbing Code (IPC), 2021 International Swimming Pool and Spa Code (ISPSC), 2021 International Private Sewage Disposal Code (IPSDC), 2021 International Green Construction Code (IgCC), 2023 NFPA 70 National Electrical Code (NEC), 2021 International Fire Code, and 2021 International Property Maintenance Code. Source: Commerce City Municipal Code Chapter 5, Sec. 5-1 and 5-2, https://www.c3gov.com/Business-Development/Building-Permits-Inspections/Step-1-Project-Design/Building-Code-Provisions-in-the-Municipal-Code; City of Commerce City Construction Code — the 2021 IBC as adopted, including Appendix Chapters C, E, F, G, H, I, J, K and N. Source: c3gov.com 2021 International Building Code page, https://www.c3gov.com/Business-Development/Building-Permits-Inspections/Step-1-Project-Design/2021-International-Building-Code; City of Commerce City Residential Code — the 2021 IRC as adopted, including Appendix Chapters AH, AI, AJ, AK, AM, AQ, AR, AS, AT, AU and AW. Source: c3gov.com 2021 International Residential Code page, https://www.c3gov.com/Business-Development/Building-Permits-Inspections/Step-1-Project-Design/2021-International-Residential-Code; City of Commerce City Commercial Energy Conservation Code and City of Commerce City Residential Energy Conservation Code — the 2021 IECC as locally amended (Sections C101.1/R101.1 renamed; C103/R103 construction-document amendments; C104/R104 fees deleted and replaced to reference Article VI, Chapter 5 fee schedule; C109/R109 stop-work order and C110/R110 board-of-appeals sections replaced to reference Commerce City Municipal Code Sec. 5-5007 and Sec. 5-21). For permit applications submitted prior to July 1, 2026, applicants may choose to comply with the 2018 IECC as amended by the city instead. Source: c3gov.com 2021 IECC page, https://www.c3gov.com/Business-Development/Building-Permits-Inspections/Step-1-Project-Design/2021-International-Energy-Conservation-Code; 2023 NFPA 70 National Electrical Code (NEC), adopted by reference per Municipal Code Sec. 5-2. Source: Commerce City Municipal Code Chapter 5, Sec. 5-2; Construction for which a permit application is submitted six months after the effective date of the 2021 C3BC must comply with the 2021 C3BC; applicants during that six-month transition window could choose either the 2021 C3BC or the prior edition; IBC-designed permit applicants were permitted one year after the effective date to comply. Source: Commerce City Municipal Code Chapter 5, Sec. 5-4. Local amendments apply — see the Commerce City overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-13.

Fees, timelines, and adopted codes are researched from each jurisdiction's published records — see how we verify. Requirements change and vary by project, so always confirm the current details with the Commerce City building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

Other permits in Commerce City

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