Custom Site Plans for Decks, Porches & Patios — lot coverage calculations in 24 hours.
Fast 24-Hour Turnaround
Rush delivery available when needed.
High-accuracy site drawings
Clear, professional drawings you can rely on.
No Site Visit Required
Revision included with every order.
Deck & Porch Site Plans
Adding a porch or a deck is the best way to expand your outdoor living area, but in many states, even an open-air addition requires a permit. At Prime Site Plan, we specialize in drafting layouts for porches and decks that meet the most demanding building codes. We focus on the critical distances between your new addition, your home, and other features like pools or property lines.
Lot Coverage & Impervious Surface Calculations
High-density areas like Los Angeles County require meticulous area calculations to ensure you don’t exceed your lot’s buildable limit. Our GIS-based approach allows us to calculate your total impervious surface area with extreme accuracy, saving you from permit rejections due to calculation errors.
HOW IT WORKS
Our site plans are non-certified and are not intended to replace a legal survey.
The Prime Advantage
Example: Porch Addition Site Plan in Alhambra, CA
This plan includes mandatory area calculation tables and shows the exact relationship between the new porch addition and the primary residence.
The plan features precise lot coverage data, stair and landing dimensions, and safety clearance measurements — formatted to Los Angeles County standards.
Choose your preferred plan level below for a permit-ready site plan delivered in 24 hours.
Base Site Plan
Efficient and accurate site plan for small residential projects and simple permit applications. Features included:
- Property boundaries
- Primary structure
- Lot dimensions
- North arrow
- Scale
- Parcel ID
- Address
Standard Site Plan
Detailed site plan including property boundaries, driveways, and building footprints — ideal for most residential permits. Features included:
- Property boundaries
- Primary structure
- Roof line
- Lot dimensions
- Driveways / parking areas
- Fence
- Landscaping elements
- North arrow
- Scale
- Measurements between major features
- Parcel ID
- Address
- Add new structures (option)
Elite Site Plan
High-detail site plan with zoning and advanced measurements for complex residential projects. Features included:
- Property boundaries
- Primary structure
- Roof line
- Lot dimensions
- Driveways / parking areas
- Walkways
- Sidewalks
- Fence
- Landscaping & terrain features
- North arrow
- Scale
- Measurements between major features
- Parcel ID
- Address
- Add new structures (option)
Commercial Site Plan
Comprehensive commercial site plan including parking, access, structures, and site improvements. Features included:
- Property boundaries
- Primary structure(s)
- Roof line(s)
- Lot dimensions
- Driveways / parking lots
- Landscaping & terrain features
- Walkways
- Fence
- Sidewalks
- North arrow
- Scale
- Measurements between major features
- Parcel ID
- Address
- Add new structures (option)
What Clients Say About Our Deck & Porch Plans
Real feedback from homeowners who used our site plans for deck and porch permit applications across the U.S.
Reviews
James Anderson
Excellent service! The lot coverage calculations saved my porch project — I was close to the limit and they got it exactly right.
Jessica Martinez
Clear, detailed deck plan. The safety clearance measurements were spot on and my contractor loved the precision.
David Miller
They helped me navigate the strict lot coverage rules in my HOA. Very professional and knowledgeable.
Frequently Asked Questions
Everything you need to know before ordering your Decks, Porches & Patios site plan.
Yes, most municipalities require a site plan showing lot coverage calculations, setbacks, and structural footprints. In high-density areas, accurate impervious surface ratio (ISR) calculations are especially critical.
We include mandatory impervious vs. pervious surface ratios for your entire property, plus the precise footprint of your new deck or porch — formatted to your local building department’s specific requirements.
We offer unlimited revisions. If an inspector needs adjusted dimensions or additional clearance measurements, just let us know and we’ll update it for free.
Yes. We map all levels, including stairs, landings, and structural footprints, with precise dimensions and safety clearances from property lines and existing structures.
Standard turnaround is 24 hours. Rush Delivery available within 12 hours. You’ll receive a high-resolution PDF directly in your inbox.
Not Sure Which Plan Is Right for Your Project?
Every building department has different requirements. If you’re unsure about the level of detail your permit office demands, we are here to help. Send us your project details, and we’ll recommend the best fit for a successful approval.