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Solar PV Permit (Roof Top Unit/Solar/Telecommunication) in Louisville, Colorado

Required for installation of rooftop or ground-mounted solar photovoltaic systems in Louisville. The City's own Permit Information page publishes a dedicated 'Roof Top Unit/Solar/Telecommunication' review-timeline category, distinct from both the fast Minor Permit track and the slower Residential/Commercial new-construction tracks. Billed on the same valuation-based Building Permit Fee Table as other permits, plus the City's use-tax stack. Solar contractors need a specific Colorado DORA Solar license type in addition to a City of Louisville Contractor License.

Verified 2026-07-20 · Source

When you need this permit

  • Governed by the City's adopted 2024 IBC/IRC (structural/racking scope) and 2023 NEC (electrical interconnection scope, effective 1/5/2024)
  • Falls under the City's published 'Roof Top Unit/Solar/Telecommunication' review-timeline category, per the Permit Information page's Estimated Submittal Review Times table
  • Contractors performing solar installation work must hold the corresponding Colorado DORA Master License for the Solar license type, plus a State Contractor License AND a City of Louisville Contractor License (LMC Sec. 5.12.090) before a permit can be issued — per the Contractor Licensing page's Electrical/Plumbing/Solar license-type requirement Contractor
  • Valuation = cost of materials, labor, and profit for the installation; the higher of stated contract cost or the City's Building Valuation Data Table governs the fee
  • All permit submittals must be made electronically through the City's CSS Online Portal
  • Fire Hardening Code roof-covering and vent-mesh requirements (Class A rating, 1/8-inch metal mesh) may interact with roof-mounted racking scope — confirm compliance with the Building Safety Division

Required documents

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Fee schedule

Building/Electrical Permit Fee — valuation $0.00 to $500.00City of Louisville Building Permit Fee Table, Table 4, CC 12/03/24 — no dedicated solar-specific flat fee line is published; PV installations are billed on the same general valuation-based table as other building/electrical permits.
$28.00
Building/Electrical Permit Fee — valuation $2,001.00 to $25,000.00Table 4, CC 12/03/24 — typical valuation range for a residential rooftop PV system
$82.00 for the first $2,000.00 plus $16.00 for each additional $1,000.00 or fraction thereof, to and including $25,000.00
In-House Plan Review FeeCity of Louisville Plan Review and Administration Fees table
65% of the building/electrical permit fee
Boulder County Use Tax
1.185% of 50% of Total Valuation
City of Louisville Use Tax
3.775% of 50% of Total Valuation

Review timeline

Plan reviewLouisville’s published plan-review target
10–15 business days

How long did your Solar PV Permit (Roof Top Unit/Solar/Telecommunication) permit actually take in Louisville?

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

Inspection process

  1. 1

    Rough Electrical

    Conduit runs, wire sizing, and disconnect placement before cover, requested via the CSS portal

  2. 2

    Building Final (racking/structural)

    Racking, roof penetrations, and structural attachment verified against approved plans

  3. 3

    Final Electrical

    System energized and verified; devices installed and labeled per the 2023 NEC

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

Tips

  • Solar installations get their own published review-timeline category (2-3 weeks for first comments) distinct from the fast 1-2 business day Minor Permit track used for other single-trade electrical work — budget accordingly rather than assuming solar moves as fast as a simple electrical alteration.
  • Louisville's Contractor Licensing page names 'Solar' as its own license type alongside Electrical and Plumbing — confirm your installer holds the Colorado DORA Solar Master License AND a City of Louisville Contractor License, not just a general electrical license. Contractor
  • The same use-tax stack (Boulder County 1.185% + City 3.775%, each on 50% of valuation) that applies to other building permits also applies to a solar PV installation's valuation.

Frequently asked questions

Louisville requires a solar pv permit (roof top unit/solar/telecommunication) for: Governed by the City's adopted 2024 IBC/IRC (structural/racking scope) and 2023 NEC (electrical interconnection scope, effective 1/5/2024); Falls under the City's published 'Roof Top Unit/Solar/Telecommunication' review-timeline category, per the Permit Information page's Estimated Submittal Review Times table; Contractors performing solar installation work must hold the corresponding Colorado DORA Master License for the Solar license type, plus a State Contractor License AND a City of Louisville Contractor License (LMC Sec. 5.12.090) before a permit can be issued — per the Contractor Licensing page's Electrical/Plumbing/Solar license-type requirement; Valuation = cost of materials, labor, and profit for the installation; the higher of stated contract cost or the City's Building Valuation Data Table governs the fee; All permit submittals must be made electronically through the City's CSS Online Portal; Fire Hardening Code roof-covering and vent-mesh requirements (Class A rating, 1/8-inch metal mesh) may interact with roof-mounted racking scope — confirm compliance with the Building Safety Division. If your project isn't listed, confirm with City of Louisville Building Safety Division at (303) 335-4584 before starting work.

In Louisville, the published Building/Electrical Permit Fee — valuation $0.00 to $500.00 is: $28.00. Additional published fees: Building/Electrical Permit Fee — valuation $2,001.00 to $25,000.00 — $82.00 for the first $2,000.00 plus $16.00 for each additional $1,000.00 or fraction thereof, to and including $25,000.00; In-House Plan Review Fee — 65% of the building/electrical permit fee; Boulder County Use Tax — 1.185% of 50% of Total Valuation; City of Louisville Use Tax — 3.775% of 50% of Total Valuation. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

The City's own published Estimated Submittal Review Times list 'Roof Top Unit/Solar/Telecommunication' at 2-3 weeks (10-15 business days) for first review comments — faster than the 3-4 week Residential Permits category but slower than the 1-2 business day Minor Permits track.

You'll need: Building/Electrical Permit Application (CSS Online Portal); City of Louisville Contractor License (Solar license type); Construction Drawings / One-Line Electrical Diagram. See the required-documents checklist on this page for details on each.

Louisville requires 3 inspection(s) for a solar pv permit (roof top unit/solar/telecommunication), in order: Rough Electrical, Building Final (racking/structural), Final Electrical. Schedule each through City of Louisville Building Safety Division ((303) 335-4584).

Apply through City of Louisville Building Safety Division at City Hall, 749 Main St, Louisville, CO 80027. Phone: (303) 335-4584, email: building@louisvilleco.gov. Office hours: Monday-Thursday 8AM-4PM (in-person; remote 4PM-5PM); Friday 8AM-5PM remote/by appointment only; Tuesday 11AM-12PM limited staff availability (staff meeting). Inspection hours Monday-Friday 6:30AM-5PM.. Official information: https://www.louisvilleco.gov/local-government/government/departments/building-safety.

Louisville, Colorado has adopted: 2024 International Building Code (IBC), effective 12/6/2025 — City of Louisville Building Codes page; 2024 International Residential Code (IRC), effective 12/6/2025; 2024 International Energy Conservation Code (IECC), effective 12/6/2025; 2024 International Fire Code (IFC), effective 12/6/2025; 2024 International Plumbing Code (IPC), effective 12/6/2025; 2024 International Fuel Gas Code (IFGC), effective 12/6/2025; 2024 International Mechanical Code (IMC), effective 12/6/2025; 2024 International Existing Building Code (IEBC), effective 12/6/2025; 2024 International Property Maintenance Code (IPMC), effective 12/6/2025; 2023 National Electrical Code (NEC), effective 1/5/2024; local amendment NEC 210.8(F) Exception #2 takes effect 9/1/2026 requiring GFCI protection on all new outdoor A/C units; 1997 Uniform Code for the Abatement of Dangerous Buildings, effective 12/6/2025; 1997 Uniform Housing Code, effective 12/6/2025; Colorado Model Electric Ready and Solar Ready Code, effective 12/6/2025; Louisville Fire Hardening Code — Ordinance 1884 (series 2024), updated by Ordinance 1891 (series 2025) and Emergency Ordinance 1913 (series 2026, effective 1/21/2026) — sets minimum fire-resistant construction standards for new construction, accessory structures, and repair/replacement of specific home systems (roofing, siding, decks, fencing, vents, gutters) to reduce wildfire spread risk; applies citywide, not limited to a mapped WUI zone; Louisville Municipal Code Chapter 15 — Buildings and Construction (local amendments and adoption-by-reference); Louisville Municipal Code Chapter 5.12 (Section 5.12.090) — Contractor Licensing: any contractor employed on a building project must be licensed with the City of Louisville and listed on the permit; Prior to 12/6/2025 the City operated under the 2018 ICC codes; the 2024 ICC code adoption ordinance and effective date are confirmed on the City's Building Codes page. Local amendments apply — see the Louisville overview page for the full list.

Yes. The City's Contractor Licensing page lists Solar as its own license type, requiring the corresponding Colorado DORA Master License plus a State Contractor License, in addition to a City of Louisville Contractor License under LMC Sec. 5.12.090.

Sources & verification

Verified against official sources. Last reviewed 2026-07-20.

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 Louisville building department before you submit. PermitBase is an independent reference and is not affiliated with any government agency.

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