Property Lines and Dimensions
The legal boundaries of the lot, drawn to scale with their lengths labeled. Everything else on the sheet is measured against these lines, so they anchor the entire drawing.
Site Plan Basics: What It Shows and Why Permits Depend on It
Before a permit reviewer ever studies your floor plan, they usually start with your site plan. It is the drawing that shows where your project sits on the property, and it is one of the most common places a residential permit application gets held up. This guide explains what a site plan is, what it typically includes, how it differs from a floor plan, and how to avoid the mistakes that stall approvals.
What Is a Site Plan?
A site plan is a scaled, bird's-eye-view drawing of your entire property. Where a floor plan looks inside the walls, a site plan zooms out to show the whole lot: the boundaries, the existing buildings, the proposed work, and how everything relates to the features around it.
Permit reviewers lean on the site plan to answer a zoning question before they ever get to a building question: is this project allowed to sit where you want to put it? Setback rules, lot coverage limits, easements, and drainage patterns are all evaluated from this one sheet. That is why a weak site plan can stall an application even when the construction drawings behind it are excellent.
Site plans go by different names in different places. You may see "plot plan," "site diagram," or "development plan" on a local checklist. The exact label and level of detail vary by jurisdiction, but the core idea is the same everywhere: show the reviewer the whole property, to scale, with the proposed work clearly located on it.
What a Site Plan Typically Shows
Every permitting office publishes its own submittal requirements, so treat this as a general map of the territory rather than a universal checklist. Most residential site plans include some combination of the following elements.
Setbacks
The minimum required distances between structures and the property lines, as defined by local zoning. The site plan shows the setback lines and dimensions proving the proposed work stays on the right side of them.
Existing and Proposed Structures
The house, detached garage, sheds, decks, and any other built features, plus the new work clearly distinguished from what is already there. Reviewers want to see the before and after on one sheet.
Easements
Recorded rights that let others use part of your land, such as utility corridors or shared driveways. Building over an easement is a classic permit problem, so these areas need to be shown and labeled.
Drainage and Grading
How water moves across the lot: slopes, drainage direction, and sometimes existing and proposed grades. Many jurisdictions want assurance that new construction will not push stormwater onto a neighbor's property.
Utilities
The locations of water, sewer or septic, gas, and electrical service as they relate to the project. This matters most when new connections are planned or when construction comes near existing lines.
Depending on the project and the jurisdiction, a site plan may also carry a north arrow, the drawing scale, street names, driveway and parking locations, significant trees, and impervious surface calculations. The submittal checklist for your city or county is always the controlling document.
Site Plan vs. Floor Plan: Two Different Questions
Homeowners often use the two terms interchangeably, but they answer different questions for different reviewers.
The Site Plan Asks "Where?"
It shows the project in the context of the whole property: distances to boundaries, relationship to easements, and impact on drainage. It is primarily a zoning and land-use document, drawn at a scale that fits the entire lot on the page.
The Floor Plan Asks "What?"
It shows the interior layout of the building itself: rooms, walls, doors, windows, and dimensions. It is primarily a building-code document, drawn at a larger scale focused on the structure alone.
A complete permit submittal generally needs both, along with elevations, structural sheets, and other drawings that vary by project type. For a full walkthrough of what belongs in a submittal package, see our guide to permit-ready house plans explained.
Common Site Plan Mistakes That Stall Permits
Correction letters cost weeks. These are the recurring problems that send site plans back for revision.
Guessed Property Lines
Fences, hedges, and lawn edges are not legal boundaries. When the drawn lines do not match the recorded ones, every dimension on the sheet becomes suspect and the review stops.
Missing or Mislabeled Setbacks
Leaving off setback dimensions, or measuring them to the wrong point on the structure, forces the reviewer to do your math for you. Most will simply return the drawing instead.
Omitted Existing Structures
A shed or detached garage left off the plan can throw off lot coverage calculations and raise questions about unpermitted work. Show everything that stands on the property.
Ignored Easements
Easements do not always show up on older informal drawings, but they are recorded against the title. Proposing construction inside one, even unknowingly, can stall or sink an application.
No Drainage Information
Where grading and drainage details are required, a plan that stays silent on water flow invites a correction cycle, particularly for additions and accessory structures that add roof area.
Missing Scale, North Arrow, or Dimensions
A sketch without a stated scale or measurable dimensions cannot be verified. Reviewers need to check distances themselves, and an unscaled drawing makes that impossible.
Planning an addition, ADU, or new build? Apex Drafting Services prepares clear, reviewer-friendly site plans as part of complete permit drawing sets, fully remote and nationwide.
Get a Free QuoteSurvey vs. Existing Records: Which Do You Need?
A site plan is only as reliable as the boundary information behind it, and that information comes from one of two places: a professional land survey or existing records such as plat maps, prior surveys, deeds, and county GIS data.
Existing records are often adequate when the stakes are low: the project sits comfortably inside the setbacks, the lot has clear and undisputed boundaries, and a prior survey or recorded plat is available. Many homeowners can support a simple project this way, though acceptance varies by jurisdiction.
A new survey earns its cost when precision matters. County GIS maps are convenient but approximate, and they are generally not intended to establish legal boundaries. If your project pushes close to a setback line, if boundary markers are missing or disputed, if no reliable prior survey exists, or if your jurisdiction or lender requires one, a licensed surveyor is the right call.
- Check your jurisdiction's submittal checklist to see what boundary documentation it accepts.
- Gather what you already have: prior surveys, the recorded plat, your deed, and title documents.
- Measure how close the proposed work comes to any setback, easement, or lot coverage limit.
- Order a survey when the margin is tight, the records are thin, or the rules require it.
Where Professional Drafting Fits In
Drafters do not establish boundaries, but we turn boundary data and project intent into the drawing a reviewer can actually approve. Apex Drafting Services prepares site plans from the survey or records you provide and integrates them into complete permit-ready drawing sets, with the scale, dimensions, labels, and layout conventions reviewers expect.
Site plans matter most on footprint-changing projects, which is why they are built into our ADU plans and design and home addition and remodel drafting work. Even a pre-designed home needs a lot-specific site plan before it can be permitted, so buyers of our stock house plans, which start at $799, typically pair the plan set with a site plan drawn for their specific property.
Frequently Asked Questions
Do I need a site plan for every home project?
Requirements vary by jurisdiction. Interior remodels that do not change the building footprint often do not require one, while additions, ADUs, detached garages, and new homes usually do. Your local permitting office publishes submittal checklists that spell out exactly what your project needs.
Can I draw my own site plan?
Some jurisdictions accept owner-drawn site plans for simple projects, but many expect a scaled, fully dimensioned drawing, especially when construction comes close to a setback line. A professionally drafted site plan reduces the chance of a correction letter and a resubmittal cycle.
What is the difference between a site plan and a survey?
A survey is performed by a licensed land surveyor and legally establishes where your property boundaries are. A site plan is a drawing that uses boundary information, from a survey or from existing records, to show how your project sits on the lot. A site plan does not replace a survey when precise boundary locations matter.
How accurate does a site plan need to be?
Accurate enough for a reviewer to verify compliance, which generally means drawn to scale with clear dimensions from structures to property lines. The tolerance varies by jurisdiction. When a project sits close to a setback or lot coverage limit, survey-grade boundary data is usually the safer basis for the drawing.
Can Apex Drafting Services prepare a site plan remotely?
Yes. Apex Drafting Services works 100% remotely nationwide. We prepare site plans from the survey, plat map, deed, county records, and photos you provide, and we fold the site plan into a complete permit-ready drawing set for your jurisdiction.
Ready to get your project on paper and through review? Tell us about your lot and your plans, or call (435) 668-1095.
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