Definition
A site plan is a scaled drawing that shows how a property will be physically developed. It illustrates the building footprint, parking layout, drive aisles, access points, sidewalks, landscaping, utilities, setbacks, and other improvements within the property boundaries.
Site plans are central to zoning compliance, entitlements, civil engineering, and investment feasibility.
What a Site Plan Typically Includes
1) Property Information
- Property lines and dimensions
- Lot size and area calculations
- Easements and right-of-way boundaries
- Setbacks and buildable area
2) Building Layout
- Building footprint and dimensions
- Entrances and exits
- Loading areas and service zones
- Height notes (if required)
3) Parking & Circulation
- Parking stall count and striping
- ADA-compliant spaces and access aisles
- Drive aisles and turning radii
- Ingress/egress connections to public roads
4) Landscaping & Open Space
- Tree preservation or replacement
- Landscape buffers and screening
- Courtyards and amenity areas
- Required open-space percentages
5) Utilities & Drainage
- Water and sewer connections
- Stormwater management systems (detention/retention)
- Fire hydrants and fire lanes
- Electrical and telecom service locations
Why Site Plans Matter to Investors
- Density feasibility: Determines achievable units per acre and FAR.
- Lot coverage compliance: Confirms footprint limits under zoning.
- Parking ratios: Validates tenant requirements and lender expectations.
- Construction costs: Civil work, grading, and utilities materially impact the budget.
- Entitlement timeline: Site plan approval is often required before building permits.
Concept Plan vs. Approved Site Plan
- Concept Plan: Preliminary layout used for feasibility, marketing, or initial zoning review.
- Approved Site Plan: Formally reviewed and approved by the governing authority; typically required before construction documents and building permits.
Underwriting Considerations
- Confirm unit count and rentable square footage derived from the layout.
- Verify parking count meets both zoning and market expectations.
- Model stormwater and utility extension costs shown on civil drawings.
- Account for landscape, lighting, and hardscape requirements.
- Review access and visibility for retail-driven projects.
Example Scenario
A developer underwrites 150 multifamily units on 4 acres. After the civil engineer prepares the site plan, required setbacks, fire lanes, and stormwater detention reduce the buildable footprint, resulting in only 132 feasible units without structured parking.
The site plan reveals a critical underwriting adjustment before land closing.
Common Pitfalls
- Ignoring fire access requirements: Fire lanes can significantly reduce parking or buildable area.
- Underestimating stormwater impact: Detention ponds may consume valuable land.
- Failing to check easements: Utility or access easements can eliminate buildable area.
- Overlooking ADA compliance: Parking and pathway adjustments can affect layout efficiency.