Do You Need a Site Plan in Colorado?
Yes. Across Colorado’s 64 counties and 270+ incorporated municipalities, virtually every permit involving an exterior footprint modification—including new homes, room additions, detached garages, storage sheds exceeding local thresholds, in-ground pools, and structural decks—requires a dimensioned site plan or plot plan.
> Notice: This site plan maker online webtool produces preliminary, conceptual site plans for permit applications where local ordinances allow homeowner or contractor-prepared drawings. It does not replace a licensed boundary survey or supply an engineered soils report. Always verify specific plan submission mandates with your local building department.
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What Makes Colorado Permitting Different
Colorado presents four unique structural and geographical conditions that directly shape site plan expectations:
1. No Statewide Building Code (Home-Rule Autonomy)
Unlike most states that enforce a unified state building code, Colorado delegates all building code adoption to local county commissioners and municipal councils. Denver enforces the Denver Building Code alongside its proprietary form-based Denver Zoning Code; the Pikes Peak Regional Building Department (serving El Paso County and Colorado Springs) enforces regional amendments; and mountain towns frequently enforce specialized snow-load and timber regulations.
2. Expansive Clay Soils & Geotechnical Requirements
Along the Front Range and eastern plains, expansive bentonite soils expand when wet and contract when dry. Consequently, most Colorado jurisdictions (including Westminster, Aurora, and Douglas County) mandate site-specific geotechnical soils investigations and engineered foundation designs sealed by a Colorado Professional Engineer for additions and new builds.
3. Wildland-Urban Interface (WUI) & Wildfire Defensible Space
With extensive residential development in the foothills and mountains, Colorado communities enforce rigorous Wildland-Urban Interface codes. Site plans for foothill properties (in Jefferson, Boulder, Summit, and Larimer counties) frequently require:
- Delineation of Zone 1 (0–5 feet non-combustible zone), Zone 2 (5–30 feet fuel reduction zone), and Zone 3 (30–100 feet thinning zone).
- Identification of mature pine and juniper clusters.
- Fire apparatus access turnarounds and emergency water cistern locations.
4. Colorado Model Electric and Solar-Ready Code
Under state climate legislation, local jurisdictions adopting updated code cycles must incorporate provisions for electric vehicle (EV) charging conduits and solar-ready roof configurations on residential plans.
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What Colorado Building Departments Require on a Site Plan
Whether you are filing in Denver, El Paso, Adams, Arapahoe, Jefferson, or Larimer counties, municipal reviewers expect to see these critical components:
| Status | Requirement |
|---|---|
| ☐ | Boundary Lines with Accurate Dimensions and Total Lot Area |
| ☐ | County Assessor Schedule / Parcel Number (PIN / APN) |
| ☐ | Full Legal Description (Subdivision Name, Lot, Block, Filing Number) |
| ☐ | Existing Structures (House Footprint, Garages, Sheds, Porches) |
| ☐ | Proposed Construction Dimensions, Gross Floor Area, & Eave Overhangs |
| ☐ | Front, Rear, Interior Side, & Corner Side Yard Setbacks |
| ☐ | Public & Private Utility Easements, Drainage Corridors, & Rights-of-Way |
| ☐ | Slope Contours & Grade Changes (2-foot to 5-foot intervals if sloping) |
| ☐ | Direction of Roof Drainage and Surface Water Runoff |
| ☐ | Wildfire Defensible Space Buffer Radii (30-foot & 100-foot rings) |
| ☐ | Driveway Location, Curb Cuts, Sight Triangles, & Off-Street Parking |
| ☐ | Architect or Engineer Scale (e.g., 1"=20', 1/4"=1') and North Arrow |
Essential Scale and Sheet Standards
- Pikes Peak RBD: Scale no smaller than 1/8″ = 1′-0″ (1/4″ = 1′-0″ preferred).
- Larimer County: Requires drawings at standard engineer scale (1″ = 10′ or 1″ = 20′).
- Pueblo: Standard residential site plans must fit within 11″ × 17″ sheet format.
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Key Colorado Municipalities & County Insights
1. Denver (City and County of Denver)
- Zoning Framework: Governed by the form-based Denver Zoning Code (DZC). Properties fall into specific "Neighborhood Contexts":
- Suburban (S): Front setback 20 ft, side 5 ft, rear 10–15 ft.
- Urban Edge (E): Front setback 15–20 ft, side 5 ft, rear 10 ft.
- Urban (U): Front setback 10–15 ft, side 3–5 ft, rear 10 ft.
- General Urban (G): Build-to lines 0–10 ft.
- ADU Standards: Detached ADUs allowed up to 1,000 sq ft and 24 feet in height, requiring 5-foot side and rear setbacks.
2. Adams County
- System: Unincorporated areas are managed via the E-Permit Center. Generous exemptions exist: storage sheds 200 sq ft or less and decks 30 inches or less above grade do not require building permits.
- Reference Guide: Read our dedicated Adams County site plan guide for full local permit details and PDF formatting requirements.
3. Aurora (Adams, Arapahoe & Douglas Counties)
- Overlay Zones: Governed by Chapter 146 of the Aurora City Code. Reviewers scrutinize compatibility with Buckley Space Force Base flight paths, Fitzsimons overlays, and reservoir watershed protection zones.
4. Pikes Peak Region (El Paso County / Colorado Springs)
- Regional Model: The Pikes Peak Regional Building Department (PPRBD) serves Colorado Springs, Monument, Fountain, and unincorporated El Paso County. Homeowners intending to execute their own work may prepare and submit their own site plans directly.
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Colorado Owner-Builder Privileges and Trade Restrictions
Under Colorado law, homeowners enjoy significant owner-builder rights:
- Primary Residence Exemption: You may act as your own general contractor for renovations, decks, and accessory buildings on your primary residence.
- Trade Licensing Safeguards: Electrical and plumbing installations under a homeowner permit must be inspected stringently against the National Electrical Code and Colorado Plumbing Code. You must reside in the property, and you cannot hire unlicensed third-party subcontractors to perform trade tasks under an owner-builder permit.
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Project-by-Project Guide for Colorado Builders
Find layout details for your specific outdoor installation:
- Fence Permit Site Plan: Verify height maximums (typically 42 inches in front yards and 6 feet in rear/side yards) and property line alignments.
- Deck Permit Site Plan: Plan pier footings designed to resist heavy mountain snow loads and extending below local frost depth (typically 30 to 36 inches along the Front Range).
- Shed Permit Site Plan: Many Colorado jurisdictions exempt one-story accessory sheds up to 120 or 200 square feet, though zoning setbacks still apply.
- Patio Site Plan: Map patio slabs and outdoor fire pits accounting for defensible space clearance.
- Driveway Permit Site Plan: Illustrate curb cut connections, culvert pipes, and maximum slope grades on hillside driveways.
- Swimming Pool Permit Site Plan: Detail safety enclosure fencing, pool covers, and expansive soil sub-base engineering.
- Garage Permit Site Plan: Diagram detached garages and workshops with alley and side yard setback verifications.
- Home Addition Site Plan: Show expanded home footprints, engineered foundation tie-ins, and lot coverage calculations.
- ADU Site Plan: Position accessory dwelling units or carriage houses under updated municipal zoning reforms across Denver and Front Range communities.
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Comparing Your Site Plan Preparation Paths in Colorado
| Preparation Method | Cost Range | Turnaround | Boundary Stamp Included? | Best Project Match |
|---|---|---|---|---|
| Our Site Plan Creator | Free First Draft / Self-Serve | Minutes | ❌ No | Sheds, decks, fences, patios, preliminary addition layouts |
| Hand-Drawn Paper Sketch | Free | Several Hours | ❌ No | Western Slope rural projects, simple fence permits in small towns |
| Local Draftsman | $300 – $800 | 1 – 2 Weeks | ❌ No | Architectural remodels requiring structural elevation sheets |
| SitePlans.us Custom Drafting | $129 – $199 | 1 – 3 Business Days | ❌ No | Fast turnaround for addressing municipal plan check correction notices |
| Colorado-Licensed Land Surveyor | $800 – $2,500+ | 3 – 5 Weeks | ✅ Certified Stamp | New home construction, mountain parcels, cities requiring stamped plot plans |
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How to Build Your Plan Using Our Site Plan Maker
With our site plan creator web app, assembling a compliant layout takes five straightforward steps:
- Enter Your Colorado Property Address: Our site plan creator imports available digital parcel boundaries and county GIS records.
Read full Guide how to How to Enter Property Address
- Review Boundaries & Setbacks: Check property line dimensions against your deed or recorded subdivision plat.
Read full tutorial How to Check Selected Parcel
- Drop Your Proposed Structure: Place your deck, garage, addition, or shed using true-to-scale measurements.
Support desk Tutorial on How to Add strucuture
- Fine-Tune Dimensions & Labels: Consult how to adjust labels to ensure setback measurements and structure labels are crisp and readable.
- Format Title Block & Export: Utilize how to edit title sheets and how to fix property line labels to download a clean, scaled PDF ready for portal submission.
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Built for Homeowners, General Contractors, and Commercial Pros
Our web app accommodates every property sector across Colorado:
- Site Plans for Homeowners: Built for property owners doing this for the first time who want a clean, professional drawing without CAD learning curves.
- Site Plans for General Contractors: Keep multiple job permits moving forward and execute immediate plan adjustments from the field.
- Site Plans for Builders : Standardize layout sheets across suburban developments and infill lots.
- Site Plans for Commercial Real Estate: Produce conceptual plot plans, parking reconfigurations, and tenant improvement exhibits.
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Pricing for Our Site Plan Creator Webtool
Pick the tier that matches your project scope:
| Plan Tier | Price | Ideal For | Features Included |
|---|---|---|---|
| Starter Single Plan | $39 (One-time) | Homeowners doing a single project | High-resolution PDF export, full dimensional editing, setback callouts |
| Professional Pack | $69 / month | Active remodelers & fence/deck builders | 5 downloadable plans per month, title sheet customization, priority support |
| Unlimited Contractor | $299 / month | High-volume GCs & design-build firms | Unlimited plan exports, multi-user access, custom company branding |
Need customized API integrations, multi-office accounts, or high-volume GIS data licensing?
For Enterprise deals contact sales@siteplans.ai
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Common Permitting Pitfalls in Colorado
- Assuming a Neighboring City Has the Same Codes: Because Colorado lacks a statewide building code, assuming Denver rules apply in Aurora or Lakewood leads to immediate submission delays.
- Overlooking Expansive Soils Engineering: Failing to submit an engineered foundation plan or soils investigation in Front Range bentonite zones will halt plan check review.
- Ignoring Wildfire Defensible Space Zones: Foothill properties submitted without clearing radius annotations or non-combustible zone details face rejection by local fire protection districts.
- Exceeding Lot Coverage Caps in Denver: The Denver Zoning Code strictly enforces primary and accessory structure lot coverage maximums based on neighborhood context.
- Failing to Show Eave and Overhang Encroachments: Roof overhangs and gutters extending more than standard allowances into side setbacks are a common cause of redlines.
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Colorado Local Permitting Resources
- Colorado Department of Local Affairs (DOLA): cdola.colorado.gov — Building code policy and municipal resources.
- Professional Land Surveyors of Colorado (PLSC): plsc.net — Directory of licensed surveyors.
- Denver Community Planning and Development: denvergov.org/cpd — Denver Zoning Code and e-permits.
- Pikes Peak Regional Building Department: pprbd.org — El Paso County regional building department.
- Colorado State Forest Service: csfs.colostate.edu — Defensible space and wildfire mitigation guidelines.
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Frequently Asked Questions
Does Colorado have a statewide building code?
No. Colorado has no mandatory statewide building code. Building codes, amendments, and site plan submittal standards are adopted and enforced independently at the local municipal and county level.
Can I draw my own site plan for a building permit in Colorado?
Yes. Many Colorado jurisdictions (including the Pikes Peak Regional Building Department and numerous rural towns) allow homeowners to prepare and submit their own site plans for residential projects. However, some cities (like Westminster) require plot plans to be stamped by a Colorado-licensed surveyor or professional engineer.
How deep must footings be for a deck in Colorado?
Along the Front Range urban corridor, frost-protected footings generally must extend between 30 and 36 inches below grade. In mountain jurisdictions with heavy snow accumulation, required frost depths can exceed 48 to 54 inches.
What is an Improvement Survey Plat (ISP) in Colorado?
An ISP is a formal boundary survey defined by Colorado statute that depicts boundary lines, easements, existing improvements, and visible utilities, certified and stamped by a licensed Colorado Professional Land Surveyor. Certain mountain towns mandate an ISP for substantial building additions.
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Ready to Generate Your Colorado Site Plan?
Check your municipal zoning context, enter your address into our site plan creator webtool, drop your proposed structures, and download your dimensioned PDF in minutes.
Start My Colorado Site Plan Now →
Received plan check redlines or city correction notes? Send your files to SitePlans.us for prompt, human-reviewed drafting assistance.