Key Takeaways
- A site plan is a scaled overhead view of a property showing solar array placement and key site features
- Required by nearly every AHJ (Authority Having Jurisdiction) for residential and commercial solar permits
- Must include property lines, setbacks, access pathways, utility equipment, and array dimensions
- Typically drawn to 1/8” = 1’ or 1/16” = 1’ scale for residential projects
- Accurate site plans reduce permit rejections and inspection failures
- Modern solar design software generates site plans directly from satellite imagery and parcel data
What Is a Site Plan?
A site plan is a scaled, top-down drawing that shows the physical layout of a solar installation on a property. It depicts the location and dimensions of the solar array relative to property boundaries, existing structures, utility equipment, and access points. The site plan is a core component of the permit package submitted to the local Authority Having Jurisdiction (AHJ) for approval.
Unlike an electrical diagram that shows wiring, the site plan focuses on spatial relationships — where the panels sit, how far they are from the roof edge or property line, and where the utility meter and main service panel are located.
A rejected permit almost always traces back to a missing or inaccurate site plan. Getting the site plan right the first time saves weeks of back-and-forth with the AHJ.
What a Site Plan Includes
A complete solar site plan contains standardized elements that AHJs expect to see. Here’s what goes into a typical residential or commercial site plan:
Property Boundaries and Dimensions
The legal lot lines with dimensions, typically pulled from parcel data or a recorded survey. These establish the reference frame for all setback measurements.
Existing Structures
All buildings, garages, sheds, and permanent structures on the property, drawn to scale with dimensions and labeled.
Solar Array Placement
The exact location, dimensions, and orientation of all proposed solar panels. For roof-mounted systems, this shows panel position relative to roof edges and ridgelines.
Setbacks and Fire Pathways
Required clearances from roof edges, ridgelines, valleys, and property lines per local fire code (typically 3 feet from ridge, 18 inches from edges).
Utility Equipment Locations
Main service panel, utility meter, proposed inverter location, and AC disconnect switch. These are typically marked with standard symbols.
Conduit Routing
The path of DC and AC conduit runs from the array to the inverter and from the inverter to the main panel, including any exterior routing.
1/8” = 1’-0” (1:96) or 1/16” = 1’-0” (1:192) — must be clearly labeled on the drawingTypes of Site Plans
Different project types require different levels of detail in the site plan. Solar design software typically supports all of these formats.
Residential Roof-Mount
Shows the roof outline with panel placement, setbacks from edges and ridge, fire access pathways, and equipment locations. Simplest format — many AHJs accept a single-page plan.
Commercial Roof-Mount
Requires additional detail: structural support points, roof penetration locations, equipment pad dimensions, and sometimes a separate access plan for maintenance pathways.
Ground-Mount
Must show the array field layout, fence perimeter, trenching paths, grading plans, and often requires a professional land survey with elevation data.
Carport / Canopy
Combines structural engineering with site layout. Shows column locations, driving clearances, parking stall dimensions, and structural load paths in addition to array placement.
Always check the specific AHJ’s submission requirements before finalizing a site plan. Some jurisdictions require separate roof plans and site plans, while others accept a combined drawing. Requirements also vary for the scale, symbols, and labeling format.
Key Metrics & Elements
A complete site plan must communicate the following measurements clearly:
| Element | Typical Requirement | Why It Matters |
|---|---|---|
| Scale | 1/8” = 1’ or 1/16” = 1’ | Allows plan reviewers to verify dimensions |
| North Arrow | Required on all plans | Establishes orientation for array azimuth |
| Property Line Setbacks | Varies by zoning code | Ensures array doesn’t violate zoning ordinances |
| Roof Edge Setback | 18” from edges (IFC) | Fire department access requirement |
| Ridge Setback | 36” from ridge (IFC) | Firefighter ventilation pathway |
| Array Dimensions | Length × width in feet/meters | Confirms panels fit within available space |
| Equipment Labels | Panel, inverter, meter, disconnect | Identifies all major system components |
Array Area = (Module Width × Columns) × (Module Height × Rows) + Inter-Row SpacingPractical Guidance
Site plans are the bridge between solar design and permitting. Here’s how each role should approach them.
- Start with accurate parcel data. Pull property boundaries from county GIS or parcel databases before placing any panels. Incorrect boundaries lead to setback violations.
- Apply fire code setbacks first. Mark all required fire pathways and setbacks on the roof before designing the array layout. This prevents redesign after plan review.
- Label everything clearly. Include dimensions, compass orientation, panel count, model numbers, and equipment labels. Unlabeled elements generate revision requests.
- Use high-resolution imagery. When generating site plans from satellite images, use the most recent available imagery. Outdated images may not show new structures or landscaping.
- Verify the site plan on arrival. Compare the site plan to actual site conditions before starting work. Discrepancies between the plan and reality are common — especially for roof dimensions and equipment locations.
- Mark setback lines on the roof. Use chalk lines to physically mark the fire setback boundaries and array edges before installing any racking. This prevents placement errors.
- Keep the approved site plan on-site. Inspectors will compare the installation to the approved plan. Any deviation may require a revised plan and re-inspection.
- Document as-built changes. If field conditions require moving panels or equipment, update the site plan to create an accurate as-built record for the final inspection.
- Use the site plan as a sales tool. A professional site plan showing panels on the customer’s actual roof creates a tangible, personalized proposal that generic mockups cannot match.
- Explain setback constraints. If the customer asks why panels don’t cover the entire roof, the site plan visually demonstrates fire code setback requirements.
- Highlight permitting confidence. Showing customers a permit-ready site plan demonstrates professionalism and reduces anxiety about the installation process.
- Speed up the sales cycle. Generating a site plan during the initial consultation — rather than after contract signing — compresses the timeline and increases close rates.
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Real-World Examples
Residential: Single-Family Home in California
A designer uses solar software to generate a site plan for a 7.6 kW rooftop system. The plan shows 19 panels on a south-facing roof section, with 3-foot ridge setback and 18-inch edge setbacks per California Fire Code. The utility meter and proposed inverter location are marked on the east side of the house, with a conduit path along the eave. The AHJ approves the permit in 3 business days — no revisions needed.
Commercial: 150 kW Flat Roof Installation
A 150 kW system on a warehouse requires a detailed site plan showing 375 modules arranged in tilted rows with 4-foot inter-row spacing. The plan includes two equipment pads for string inverters, a 6-foot fire access perimeter around the array, and a separate detail showing the conduit penetration through the roof. The commercial AHJ requires a stamped plan from a licensed engineer.
Ground-Mount: 500 kW Community Solar
A ground-mount site plan shows the array field within a 2-acre parcel, with 8-foot security fencing, a 20-foot access road, and trenching paths for DC home runs to the inverter pad. The plan includes elevation contours from a professional survey and drainage patterns to demonstrate no adverse stormwater impact. County planning approval takes 6 weeks.
Common Permit Rejection Reasons
Understanding why site plans get rejected helps designers avoid costly delays:
| Rejection Reason | Frequency | Prevention |
|---|---|---|
| Missing setback dimensions | Very common | Dimension every setback line explicitly |
| No north arrow or scale | Common | Include both on every sheet |
| Outdated satellite imagery | Common | Verify with recent imagery or site visit |
| Missing equipment labels | Moderate | Label every component with make/model |
| Incorrect property boundaries | Moderate | Cross-reference with county GIS data |
| No fire access pathways | Moderate | Apply IFC setbacks before layout design |
Before submitting any permit, call the AHJ and ask for their specific site plan requirements. Many jurisdictions have downloadable checklists. Five minutes on the phone can prevent a two-week revision cycle.
Frequently Asked Questions
What is a site plan for solar installation?
A site plan is a scaled, top-down drawing showing where solar panels will be installed on a property. It includes property boundaries, building outlines, panel placement with dimensions, fire code setbacks, utility equipment locations, and conduit routing. It’s required by the local permit office before installation can begin.
Do I need a professional survey for a solar site plan?
For most residential rooftop installations, no. Solar designers typically use satellite imagery and county parcel data to generate accurate site plans. Ground-mount systems, especially larger commercial or utility-scale projects, may require a professional land survey for accurate elevation data, setback verification, and grading plans.
What scale should a solar site plan use?
Residential solar site plans typically use 1/8” = 1’-0” (1:96) or 1/16” = 1’-0” (1:192) scale. Commercial and ground-mount plans may use 1” = 20’ or 1” = 40’ depending on site size. The scale must be clearly labeled on the drawing, and the plan must be printed at the correct size — not scaled to fit.
How long does it take to create a solar site plan?
With modern solar design software, a residential site plan can be generated in 15–30 minutes. The software pulls in satellite imagery, overlays parcel boundaries, and allows the designer to place panels with automatic setback calculations. Manual drafting in CAD can take 2–4 hours. Commercial projects take longer due to additional detail requirements.
About the Contributors
General Manager · Heaven Green Energy Limited
Nimesh Katariya is General Manager at Heaven Designs Pvt Ltd, a solar design firm based in Surat, India. With 8+ years of experience and 400+ solar projects delivered across residential, commercial, and utility-scale sectors, he specialises in permit design, sales proposal strategy, and project management.
Content Head · SurgePV
Rainer Neumann is Content Head at SurgePV and a solar PV engineer with 10+ years of experience designing commercial and utility-scale systems across Europe and MENA. He has delivered 500+ installations, tested 15+ solar design software platforms firsthand, and specialises in shading analysis, string sizing, and international electrical code compliance.