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Residential Building Permit (New Construction) in Louisville, Colorado

Required for construction of new single-family detached or attached homes, multi-family buildings, and mobile homes within the City of Louisville. Reviewed under the 2024 IRC/IBC and Fire Hardening Code by the City's own Building Safety Division.

Verified 2026-07-05 · Source

When you need this permit

  • Plans must comply with the 2024 IRC/IBC as adopted (effective 12/6/2025), the 2023 NEC, and the Louisville Fire Hardening Code (Class A fire-resistant roofing, siding/eave materials, vents, gutters, and — where applicable — fencing/decks)
  • Valuation = cost of materials, labor, and profit; minimum valuation determined via the City of Louisville Building Valuation Data Table (cost per sq ft by occupancy group, e.g., R-3 one/two-family = $190.00/sq ft, 2024 table); the higher of stated contract cost or table valuation governs the fee
  • All contractors employed on the project must hold a current City of Louisville Contractor License (LMC Sec. 5.12.090) and be listed on the permit before issuance Contractor
  • All permit submittals must be made electronically through the City's CSS Online Portal
  • New single-family/multi-family/mobile home permits fall under the 'Residential Permits' category on the City's published review-time table

Required documents

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Fee schedule

Building Permit Fee — valuation $0.00 to $500.00City of Louisville Building Permit Fee Table, Table 4, updated through separate process, no annual inflator applied
$28.00 (except as provided in Sec. 15.04.060.14(e) LMC for residential permits)
Building Permit Fee — valuation $501.00 to $2,000.00
$28.00 for the first $500.00 plus $4.00 for each additional $100.00 or fraction thereof, to and including $2,000.00
Building 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
Building Permit Fee — valuation $25,001.00 to $50,000.00
$400.00 for the first $25,000.00 plus $12.00 for each additional $1,000.00 or fraction thereof, to and including $50,000.00
Building Permit Fee — valuation $50,001.00 to $100,000.00
$700.00 for the first $50,000.00 plus $8.00 for each additional $1,000.00 or fraction thereof, to and including $100,000.00
Building Permit Fee — valuation $100,001.00 to $500,000.00
$1,000.00 for the first $100,000.00 plus $6.00 for each additional $1,000.00 or fraction thereof, to and including $500,000.00
Building Permit Fee — valuation $500,001.00 to $1,000,000.00
$4,000.00 for the first $500,000.00 plus $5.00 for each additional $1,000.00 or fraction thereof, to and including $1,000,000.00
Building Permit Fee — valuation $1,000,001.00 and up
$6,000.00 for the first $1,000,000.00 plus $4.00 for each additional $1,000.00 or fraction thereof
In-House Plan Review FeeCity of Louisville Plan Review and Administration Fees table
65% of the building permit fee
Development Impact Fees — Single Family (per unit)How to Calculate Building Fees for New Residential Homes guide, Table A
$5,915.47 (1,100 sq ft or less) to $12,355.52 (2,001 sq ft or more), tiered by finished floor area; combines Library, Parks & Trails, and Transportation components
Boulder County Use Tax
1.185% of 50% of Total Valuation
City of Louisville Use Tax
3.775% of 50% of Total Valuation
Sewer Tap Fee — Single Family ResidentialCity of Louisville Fee Table, Table 3, effective 12/03/24
$4,600 per unit
Water Tap FeeContact Public Works at (303) 335-4608 for current tap fee amount
Varies by tap size (e.g., $53,500 example for a 3/4-inch tap in the City's worked example) — see Tap Fee Calculation Form

Review timeline

Plan reviewLouisville’s published plan-review target
15–20 business days

How long did your Residential Building Permit (New Construction) 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

    Foundation / Footing

    Before concrete pour

  2. 2

    Rough Frame

    Framing, sub-flooring, and stairs complete before cover

  3. 3

    Rough Plumbing / Rough Electrical / Rough Mechanical

    Trade rough-ins requested via the CSS portal before concealment

  4. 4

    Building Final

    All work complete per approved plans; Certificate of Occupancy/Completion reviewed by staff within 3 business days of a passed Building Final

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

Tips

  • All permit submittals in Louisville are electronic-only through the CSS portal — there is no paper-submittal path.
  • Confirm your parcel's Fire Hardening Code obligations early: roofing, siding, gutters, vents, decks, and fencing all carry specific Class A fire-resistance material requirements that apply citywide, not just in a mapped WUI zone.
  • Louisville's use-tax stack (Boulder County 1.185% + City 3.775%, each on 50% of valuation) is a distinct, separately-itemized cost on top of the base permit fee — factor it into estimates.
  • The published 3-4 week review figure is for FIRST review comments only, not final approval — build in time for at least one resubmittal cycle.

Frequently asked questions

Louisville requires a residential building permit (new construction) for: Plans must comply with the 2024 IRC/IBC as adopted (effective 12/6/2025), the 2023 NEC, and the Louisville Fire Hardening Code (Class A fire-resistant roofing, siding/eave materials, vents, gutters, and — where applicable — fencing/decks); Valuation = cost of materials, labor, and profit; minimum valuation determined via the City of Louisville Building Valuation Data Table (cost per sq ft by occupancy group, e.g., R-3 one/two-family = $190.00/sq ft, 2024 table); the higher of stated contract cost or table valuation governs the fee; All contractors employed on the project must hold a current City of Louisville Contractor License (LMC Sec. 5.12.090) and be listed on the permit before issuance; All permit submittals must be made electronically through the City's CSS Online Portal; New single-family/multi-family/mobile home permits fall under the 'Residential Permits' category on the City's published review-time table. 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 Permit Fee — valuation $0.00 to $500.00 is: $28.00 (except as provided in Sec. 15.04.060.14(e) LMC for residential permits). Additional published fees: Building Permit Fee — valuation $501.00 to $2,000.00 — $28.00 for the first $500.00 plus $4.00 for each additional $100.00 or fraction thereof, to and including $2,000.00; Building 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; Building Permit Fee — valuation $25,001.00 to $50,000.00 — $400.00 for the first $25,000.00 plus $12.00 for each additional $1,000.00 or fraction thereof, to and including $50,000.00; Building Permit Fee — valuation $50,001.00 to $100,000.00 — $700.00 for the first $50,000.00 plus $8.00 for each additional $1,000.00 or fraction thereof, to and including $100,000.00; Building Permit Fee — valuation $100,001.00 to $500,000.00 — $1,000.00 for the first $100,000.00 plus $6.00 for each additional $1,000.00 or fraction thereof, to and including $500,000.00; Building Permit Fee — valuation $500,001.00 to $1,000,000.00 — $4,000.00 for the first $500,000.00 plus $5.00 for each additional $1,000.00 or fraction thereof, to and including $1,000,000.00; Building Permit Fee — valuation $1,000,001.00 and up — $6,000.00 for the first $1,000,000.00 plus $4.00 for each additional $1,000.00 or fraction thereof; In-House Plan Review Fee — 65% of the building permit fee; Development Impact Fees — Single Family (per unit) — $5,915.47 (1,100 sq ft or less) to $12,355.52 (2,001 sq ft or more), tiered by finished floor area; combines Library, Parks & Trails, and Transportation components; Boulder County Use Tax — 1.185% of 50% of Total Valuation; City of Louisville Use Tax — 3.775% of 50% of Total Valuation; Sewer Tap Fee — Single Family Residential — $4,600 per unit; Water Tap Fee — Varies by tap size (e.g., $53,500 example for a 3/4-inch tap in the City's worked example) — see Tap Fee Calculation Form. 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 3-4 weeks (15-20 business days) for first review comments on new single-family, multi-family, and mobile home permits.

You'll need: Building Permit Application (CSS Online Portal); 2024 IRC IECC Plan Review Checklist (Residential); Construction Drawings; Site Plan; Foundation Setback Certification; Energy Rater Checklist (2024 IECC). See the required-documents checklist on this page for details on each.

Louisville requires 4 inspection(s) for a residential building permit (new construction), in order: Foundation / Footing, Rough Frame, Rough Plumbing / Rough Electrical / Rough Mechanical, Building Final. 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.

The City of Louisville's own Building Safety Division issues all building, electrical, mechanical, and plumbing permits within city limits. It is run in-house by City staff (Chief Building Official, Plans Examiner, Permit Technician, and Building Inspectors) — not contracted to a third-party firm like SAFEbuilt.

Sources & verification

Verified against official sources. Last reviewed 2026-07-05.

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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