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Residential Rooftop Solar (PV) and Energy Storage System (ESS) Permit in Littleton, Colorado

Required for installation of residential photovoltaic (PV) systems and energy storage systems (ESS) in Littleton. Governed by detailed City-published design/submittal requirements referencing UL/NEC standards, distinct from and more detailed than many peer Colorado jurisdictions' solar guidance.

Verified 2026-07-05 · Source

When you need this permit

  • Applies only to residential PV and ESS installations administered by the Building and Code Compliance Division; other City departments or outside authorities may require additional permits/approvals
  • For townhouses/multi-family buildings, PV panels, pathways, and setbacks must be restricted to the roof area allocated to the individual dwelling unit — cannot use a neighboring unit's rooftop as required pathway space
  • PV panels/modules must be listed/labeled per UL 1703 or both UL 61730-1 and UL 61730-2; inverters listed/labeled per UL 1741; grid-tied systems must use inverters listed for utility interaction
  • Exposed grounding conductors on the roof must be 6 AWG copper or larger (NEC 250.120(C)); a single-rod/pipe/plate grounding electrode requires a supplemental electrode spaced at least 6 feet apart (IRC E3608.4)
  • ESS must be listed/labeled per UL 9540 and installed per IRC R328.4, the NEC, and Littleton amendments; restricted to specific locations (detached garages/accessory structures, separated attached garages, exterior walls 3+ feet from doors/windows, or enclosed utility spaces with fire-rated finishes) and prohibited in sleeping rooms/closets
  • ESS installed inside dwelling units, basements, or attached garages must have interconnected smoke alarms or heat detectors
  • A digitally stamped/signed structural engineer letter is required confirming the existing structure and proposed PV system have been evaluated against Littleton's design criteria
  • All electrical design sheets must be digitally stamped/signed by a State of Colorado-registered Electrical Engineer
  • Contractors and installers must be licensed to perform PV and electrical work within the City of Littleton Contractor
  • Only 25% of panels may be installed prior to rough frame and rough electrical inspection

Required documents

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Fee schedule

Permit fee — valuation-based (Permit Fee Schedule, Resolution 2025-105)No separate solar-specific flat fee is published; billed under the general Permit Fee Schedule
$25.85 minimum, scaling per valuation tiers

Review timeline

Plan review
Not published — contact the department

How long did your Residential Rooftop Solar (PV) and Energy Storage System (ESS) Permit permit actually take in Littleton?

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

Inspection process

  1. 1

    Rough Frame / Rough Electrical

    Only 25% of panels may be installed prior to these inspections being completed

  2. 2

    Final Inspection

    Racking, roof penetrations, grounding, and electrical connections verified against stamped plans

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

Tips

  • Littleton's solar/ESS submittal requirements are unusually detailed for a mid-size Colorado city — both a stamped structural engineer letter AND stamped electrical design sheets are required, not just a general contractor sign-off.
  • If installing an ESS (battery storage), map out your intended location early — the City restricts placement away from sleeping rooms/closets and requires specific fire-rated finishes in unfinished wood-framed spaces.
  • Only 25% of panels can go up before your rough frame/rough electrical inspections pass — sequence your installer's schedule accordingly to avoid idle crew time.

Frequently asked questions

Littleton requires a residential rooftop solar (pv) and energy storage system (ess) permit for: Applies only to residential PV and ESS installations administered by the Building and Code Compliance Division; other City departments or outside authorities may require additional permits/approvals; For townhouses/multi-family buildings, PV panels, pathways, and setbacks must be restricted to the roof area allocated to the individual dwelling unit — cannot use a neighboring unit's rooftop as required pathway space; PV panels/modules must be listed/labeled per UL 1703 or both UL 61730-1 and UL 61730-2; inverters listed/labeled per UL 1741; grid-tied systems must use inverters listed for utility interaction; Exposed grounding conductors on the roof must be 6 AWG copper or larger (NEC 250.120(C)); a single-rod/pipe/plate grounding electrode requires a supplemental electrode spaced at least 6 feet apart (IRC E3608.4); ESS must be listed/labeled per UL 9540 and installed per IRC R328.4, the NEC, and Littleton amendments; restricted to specific locations (detached garages/accessory structures, separated attached garages, exterior walls 3+ feet from doors/windows, or enclosed utility spaces with fire-rated finishes) and prohibited in sleeping rooms/closets; ESS installed inside dwelling units, basements, or attached garages must have interconnected smoke alarms or heat detectors; A digitally stamped/signed structural engineer letter is required confirming the existing structure and proposed PV system have been evaluated against Littleton's design criteria; All electrical design sheets must be digitally stamped/signed by a State of Colorado-registered Electrical Engineer; Contractors and installers must be licensed to perform PV and electrical work within the City of Littleton; Only 25% of panels may be installed prior to rough frame and rough electrical inspection. If your project isn't listed, confirm with City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) at 303-795-3751 before starting work.

In Littleton, the published Permit fee — valuation-based (Permit Fee Schedule, Resolution 2025-105) is: $25.85 minimum, scaling per valuation tiers. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Littleton does not publish a plan-review timeline for this permit. Contact City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) at 303-795-3751 for current turnaround.

You'll need: Building Permit Application (eTRAKiT Online System); Stamped Structural Engineer Letter; Stamped Electrical Design Sheets. See the required-documents checklist on this page for details on each.

Littleton requires 2 inspection(s) for a residential rooftop solar (pv) and energy storage system (ess) permit, in order: Rough Frame / Rough Electrical, Final Inspection. Schedule each through City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) (303-795-3751).

Apply through City of Littleton Building and Code Compliance Division (Community Development Department, Permit Center) at Littleton Center, 2255 W. Berry Avenue, Littleton, CO 80120. Phone: 303-795-3751, email: permits@littletonco.gov. Office hours: Permit Center: Monday-Thursday 8:00 a.m.-4:30 p.m., Fridays closed; in-person walk-in hours limited to Monday 1:00-4:30 p.m. (no walk-ins after 4:15 p.m.) and Thursday 8:00-11:30 a.m.; Building Inspections staff hours 7:30 a.m.-4:30 p.m. Monday-Friday. FAX 720-741-0210, eFax 720-384-0601.. Official information: https://www.littletonco.gov/Building-Development.

Yes. A digitally stamped and signed letter from a State of Colorado-registered Structural Engineer is required, confirming evaluation of the existing structure against the proposed PV system and Littleton's design criteria.

Only in specific locations: detached garages/accessory structures, attached garages separated from living space, exterior walls at least 3 feet from doors/windows, or enclosed utility/basement/storage spaces with finished or fire-rated (5/8-inch Type X gypsum) walls and ceilings. ESS is prohibited in sleeping rooms, closets, or spaces opening directly into sleeping rooms.

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

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