Skip to main content
PermitBase

Residential Addition / Remodel Permit in Louisville, Colorado

Required for room additions, remodels, and basement finishes to existing one- and two-family dwellings in Louisville. Reviewed under the 2024 IRC and, where scope triggers it, the Fire Hardening Code and Development Impact Fees for additions exceeding 500 sq ft.

Verified 2026-07-05 · Source

When you need this permit

  • Permit required for Residential: Addition and Residential: Remodel project types per the Permit Information page's review-time table
  • Development Impact Fees apply to additions/remodels/basement finishes when adding over 500 sq ft, calculated on the DIFFERENCE between the existing square-footage bracket and the new total square-footage bracket (Table A, Ch. 3.16 LMC)
  • Valuation = materials + labor + profit; minimum per the City's Building Valuation Data Table if higher than stated contract cost
  • All contractors must hold a current City of Louisville Contractor License and be listed on the permit Contractor
  • If the addition/remodel involves exterior work (roofing, siding, decks, fencing, gutters, vents) the Fire Hardening Code material standards apply

Required documents

Check off what you have — your progress is saved on this device.

Not ready yet — 0 of 2 required documents checked.

This checker covers one permit. A full project usually triggers several — our paid checklist will assemble all of them, from $29 →

Fee schedule

Building Permit Fee (same valuation-based table as new construction)Table 4, CC 12/03/24
$28.00 minimum, scaling per the valuation tiers in the Building Permit Fee Table
In-House Plan Review Fee
65% of the building permit fee
Development Impact Fees (only if adding over 500 sq ft, assessed on the bracket difference)How to Calculate Building Fees for Residential Additions & Remodels guide
Per Table A tiers (e.g., $5,915.47-$12,355.52 range for single-family, bracket-differenced)
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
5–10 business days

How long did your Residential Addition / Remodel Permit 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 (if new footings)

    Before concrete pour

  2. 2

    Rough Frame / Rough Plumbing / Rough Electrical / Rough Mechanical

    Trade rough-ins before concealment

  3. 3

    Building Final

    All work complete per approved plans

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

Tips

  • Louisville's Development Impact Fee for additions is calculated on the DIFFERENCE between your old and new square-footage bracket — not the full new-construction fee — read the bracket table carefully before budgeting.
  • 'Residential: Addition' (3-4 weeks) and 'Residential: Remodel' (1-2 weeks) have DIFFERENT published review timelines in Louisville — confirm which category your project is classified under before setting client expectations.

Frequently asked questions

Louisville requires a residential addition / remodel permit for: Permit required for Residential: Addition and Residential: Remodel project types per the Permit Information page's review-time table; Development Impact Fees apply to additions/remodels/basement finishes when adding over 500 sq ft, calculated on the DIFFERENCE between the existing square-footage bracket and the new total square-footage bracket (Table A, Ch. 3.16 LMC); Valuation = materials + labor + profit; minimum per the City's Building Valuation Data Table if higher than stated contract cost; All contractors must hold a current City of Louisville Contractor License and be listed on the permit; If the addition/remodel involves exterior work (roofing, siding, decks, fencing, gutters, vents) the Fire Hardening Code material standards apply. 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 (same valuation-based table as new construction) is: $28.00 minimum, scaling per the valuation tiers in the Building Permit Fee Table. Additional published fees: In-House Plan Review Fee — 65% of the building permit fee; Development Impact Fees (only if adding over 500 sq ft, assessed on the bracket difference) — Per Table A tiers (e.g., $5,915.47-$12,355.52 range for single-family, bracket-differenced); 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.

No. The City's own review-time table lists 'Residential: Addition' under the Residential Permits category (3-4 weeks for first review comments) but 'Residential: Remodel' under the faster Other Permits category (1-2 weeks) — confirm which classification applies to your specific project scope.

You'll need: Building Permit Application (CSS Online Portal); Construction Drawings. Depending on your project, Louisville may also ask for: Site Improvement Valuation. See the required-documents checklist on this page for details on each.

Louisville requires 3 inspection(s) for a residential addition / remodel permit, in order: Foundation (if new footings), 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.

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.

Other permits in Louisville

Residential Building Permit (New Construction)Electrical PermitPlumbing PermitMechanical / HVAC PermitRoofing Permit (Re-Roof)Accessory Dwelling Unit (ADU) PermitDemolition PermitFence / Retaining Wall PermitSolar PV Permit (Roof Top Unit/Solar/Telecommunication)EV Charger / Electric Vehicle Charging Station Permit

Residential Addition / Remodel Permit in other cities

Akron, ColoradoArvada, ColoradoAspen, ColoradoAult, ColoradoAurora, ColoradoAvon, ColoradoBasalt, ColoradoBennett, Colorado

Compare residential addition / remodel permit fees across Colorado →

Look up this fee in a different city →

Embed this data card →

Now live

Build your Louisville project checklist

Describe your project once and get every permit, document, and fee it triggers in Louisville — in one checklist. Sign up and pay once to generate it, or go unlimited with Pro.

Get started →