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Residential Addition / Remodel Permit in Castle Pines, Colorado

Required for additions and remodels to existing single-family dwellings. Categorized as a Plan Review Permit under the 2021 IRC as locally adopted.

Verified 2026-07-06 · Source

When you need this permit

  • Plan Review Permit track: two identical drawing sets, scaled, showing all structural components
  • Additions require two foundation drawings stamped by a Colorado-licensed engineer or architect
  • Site plan required; structures may not be built over setback lines, easements, or property lines
  • New openings exceeding 6 feet in a bearing wall require detailed structural specifications
  • Additions cannot enclose bedroom or basement egress windows; heat required in all habitable rooms
  • Existing electric service amperage must be indicated; may require upgrade or relocation
  • Energy Code Compliance Report (energycodes.gov) or REScheck calculations required

Required documents

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Fee schedule

Building Permit Fee
Same valuation-based schedule as new residential construction (2026 Fee Schedule Table)
Plan Review Fee
65% of total building permit fee
Zoning Fee
$60.00 flat
Douglas County Use Tax
1% of 50% of project value
Castle Pines Use Tax
3.75% of 50% of project value

Review timeline

Plan reviewCastle Pines’s published plan-review target
1–5 business days

How long did your Residential Addition / Remodel Permit permit actually take in Castle Pines?

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

Inspection process

  1. 1

    Foundation & Foundation Wall

    After trenches excavated, reinforcement in place, forms erected, prior to concrete

  2. 2

    Underground

    Prior to covering piping/wiring and prior to concrete

  3. 3

    Rough Trade

    Plumbing/mechanical/electrical rough-in complete, prior to covering

  4. 4

    Rough Frame

    Roof, framing, fire stopping, sheathing, draft stopping, bracing, fasteners in place

  5. 5

    Insulation

    After insulation placed, prior to covering walls

  6. 6

    Final Inspection

    After the addition/remodel is completed

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

Tips

  • An as-built survey is required if the new structure is proposed within 12 inches of a required minimum setback.
  • If the property is on a septic system, county health department approval is required before a City permit will be issued.
  • A licensed land surveyor's site plan/survey is required if the project is located in a protected area.

Frequently asked questions

Yes. Residential additions require two foundation drawings stamped by a Colorado-licensed engineer or architect, per the City's Additions to Single-Family Dwellings guide.

In Castle Pines, the published Building Permit Fee is: Same valuation-based schedule as new residential construction (2026 Fee Schedule Table). Additional published fees: Plan Review Fee — 65% of total building permit fee; Zoning Fee — $60.00 flat; Douglas County Use Tax — 1% of 50% of project value; Castle Pines Use Tax — 3.75% of 50% of project value. These are the jurisdiction's own published figures — see the fee schedule table and source citations on this page.

Castle Pines's published plan-review target for a residential addition / remodel permit is 1–5 business days.

You'll need: Building Permit Application; Site Plan; Floor Plan; Foundation Detail / Construction Details. See the required-documents checklist on this page for details on each.

Castle Pines requires 6 inspection(s) for a residential addition / remodel permit, in order: Foundation & Foundation Wall, Underground, Rough Trade, Rough Frame, Insulation, Final Inspection. Schedule each through City of Castle Pines Building Department (Community Development Department, Building Division) (303-705-0227).

Apply through City of Castle Pines Building Department (Community Development Department, Building Division) at 7437 Village Square Drive, Suite 200, Castle Pines, CO 80108. Phone: 303-705-0227, email: BuildingDept@castlepinesco.gov. Office hours: Monday through Thursday 8:00 a.m. to 12:00 p.m. and 1:00 p.m. to 4:30 p.m.; Friday 8:00 a.m. to 12:00 p.m. Fax 303-688-9414..

Castle Pines, Colorado has adopted: 2021 International Building Code (IBC), Chapters 1-35 inclusive, exclusive of Appendices — adopted by Ordinance No. 23-02 (Feb. 28, 2023), City of Castle Pines Municipal Code Chapter 18, Article I; 2021 International Residential Code (IRC), 1st printing; Chapter 11 of the 2018 edition of the International Residential Code (retained separately alongside the 2021 IRC per Ordinance No. 23-02's title recitals — Chapter 11 of the IRC covers energy efficiency; the City kept the 2018 version of this chapter rather than adopting the 2021 IRC's Chapter 11 wholesale); 2020 National Electrical Code (NEC) — City of Castle Pines Municipal Code Chapter 18, Article III, Sec. 18-3-10, adopted pursuant to Title 31, Article 16, Part 2, C.R.S., 'as adopted, amended and updated to the most current edition by the Colorado State Electrical Board from time to time' per the authority in Article 23 of Title 12, C.R.S. — the City ties its NEC edition to whatever the Colorado State Electrical Board currently recognizes, rather than freezing a single print edition; 2021 International Mechanical Code (IMC), Chapters 1-15 inclusive — Article IV; 2021 International Plumbing Code (IPC), Chapters 1-13 inclusive — Article V; 2021 International Fire Code (IFC) — adopted by Ordinance No. 23-07 (2023); enforced by the South Metro Fire Rescue Fire Protection District, which Ordinance No. 23-02/23-07 designates as the Fire Marshal's Office / fire code official for the City; 2021 International Fuel Gas Code (IFGC); 2018 International Energy Conservation Code (IECC); 2021 International Swimming Pool and Spa Code (ISPSC); 2021 International Existing Building Code (IEBC); Note on code-adoption sourcing: the 2021 IBC/IRC/IMC/IPC/IFGC/IECC(2018)/ISPSC/IEBC + 2020 NEC list above is drawn directly from the recitals and Sections 1-5 of Ordinance No. 23-02 (a scanned/image PDF, read via rendered page images since it is not machine-text-extractable), the definitive code-adoption ordinance for Chapter 18 of the Municipal Code. The City's own Building Department FAQ page states more casually that the City 'is currently under the 2021 International Building Code/International Residential Code and the 2023 National Electrical Code' — this FAQ-page NEC reference (2023) is NOT used as the governing citation in this file because it conflicts with the specific, dated ordinance text (2020 NEC, floating to the State Electrical Board's current edition); the ordinance is treated as authoritative and the FAQ's '2023 NEC' is noted as a likely informal/rounded reference to whatever edition the State Electrical Board currently recognizes, consistent with the ordinance's own floating-adoption mechanism.; HB22-1362 (Colorado statewide energy code floor via updated model electrical/energy provisions): no City of Castle Pines ordinance, code-adoption page, or fee schedule references HB22-1362 or a specific electric-vehicle-readiness / electrification-readiness local amendment as of this review (Ordinance No. 23-02 predates HB22-1362's later compliance deadlines and does not mention it); not asserted as inapplicable, simply unconfirmed for this jurisdiction after checking the governing ordinance and the Building Department's public-facing pages directly.. Local amendments apply — see the Castle Pines overview page for the full list.

Sources & verification

Verified against official sources. Last reviewed 2026-07-06.

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

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