What Is a Site Plan and When Do You Need One? (202

A site plan is a scaled, top-down drawing of your property that shows the lot lines, everything already built on the lot, and whatever you are proposing to build, with the distances between them measured and labeled. Permit offices use it to check that a fence, deck, shed, pool, addition, or driveway sits where the zoning code allows, which is why nearly every residential permit application asks for one. You need a site plan whenever a project changes what is on the lot or where it sits, and you want one even without a permit when a project runs along a property line. It does not have to be a stamped survey, and for most residential work it should not cost more than a nice dinner. Ergeon generates a permit-ready, GIS-based site plan for $29 in about 15 minutes, and this guide covers what the drawing is, what it must show, which projects require it, who can prepare one, and how to get it without waiting weeks.

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This image shows a tall wooden privacy fence enclosing a residential backyard with a double wooden gate providing access from the driveway. The fence is made of vertical wooden planks with a gate latch mechanism visible on the left side. In the background, there are neighboring houses with pitched roofs, and the foreground shows a concrete driveway leading up to the closed gate. The image emphasizes secure boundary definition around the property, suggesting privacy and security considerations. A small ADT security sign is displayed near the gate, indicating a monitored alarm system. The branding 'ergeon' appears in the bottom right corner.

What is a site plan, exactly?

Think of it as a map of your lot at a scale a reviewer can measure with a ruler. A residential site plan is usually drawn at 1 inch equals 10 or 20 feet on an 11 by 17 sheet, oriented with a north arrow, and it contains two layers of information:

What exists. The parcel boundary with lot dimensions, the house footprint, garages and outbuildings, driveways and walks, pools, decks, large trees, and any easements that cross the lot.
What is proposed. The new fence line with heights and gate locations, the deck or shed outline, the pool and its barrier, or the addition, drawn in the same scale and labeled with its distance to each property line.

The distances are the point. A zoning code says a side fence may be 6 ft tall but must drop to 4 ft within the front setback, or that a shed must sit 5 ft off the rear line, or that a pool needs a barrier a certain distance from the water. The site plan is how the reviewer checks those numbers without visiting the lot.

A site plan is not a survey. A survey is a licensed surveyor's legal determination of where the boundary sits, stamped and set in the ground. A site plan is a drawing for review, and for residential work its property lines usually come from county parcel records rather than field measurement. Ergeon's guide to site plan vs. survey vs. plot plan sorts out the three terms.

What does a site plan need to show?

Permit checklists vary by city, but the core elements are consistent:

This image displays a two-column table outlining important elements typically included in a site plan and the reasons why a reviewer needs each element. The left column lists elements such as property lines with dimensions, north arrow and scale, existing structures, proposed work with dimensions, setback distances, and easements and rights of way. The right column explains the necessity of each: confirming project location on the lot, enabling measurement of the drawing, identifying existing features like house and driveway, detailing the proposed construction with heights, indicating distances from project to lot lines, and showing access rights that cannot be blocked. This table serves as a concise guide for understanding site plan components and their importance in project approval processes.

Some offices also want impervious surface calculations for patios and driveways, finished floor elevations for additions, or tree locations where tree ordinances apply. The permit application for your project type will list the exact requirements, and that list is the only one that matters.

Which projects need a site plan?

Almost any project that adds, moves, or enlarges something on the lot:

Fences. Most cities require a site plan with the fence permit, showing the route, heights by segment, gates, and setbacks. Ergeon's guide to whether you need a site plan for a fence permit goes deeper.
Decks and patios. Setbacks, lot coverage, and sometimes impervious surface limits.
Sheds and detached garages. Setbacks from side and rear lines, distance from the house, and lot coverage.
Pools and spas. The pool itself, the barrier fence, gate locations, and equipment pads.
Additions and ADUs. Lot coverage, setbacks, height, and parking.
Driveways and curb cuts. Width, distance from corners, and sight triangles.
Retaining walls over a certain height, grading, and drainage changes.

Projects that generally do not need one: interior remodels, roof replacement, window and door swaps in existing openings, and like-for-like repairs that do not change a footprint. A fence repair that replaces pickets on an existing line is a repair. A fence that moves the line or changes height is a project.

This infographic explains what a site plan is, highlighting that it is a scaled drawing showing a lot, project, and setbacks. It details that a site plan shows 8 key items such as lines, structures, project, setbacks, scale, and north arrow. The image also states the need for site plans in obtaining permits for fences, decks, sheds, pools, additions, and driveways. Additionally, it features the Ergeon plan service which provides a GIS-based, permit-ready site plan for $29, which can be produced in about 15 minutes. The image is branded by Ergeon and includes a note about permit requirements varying by city.

When do you need a site plan even without a permit?

Three situations, all of them about avoiding an expensive conversation later:

Anything along a property line. A fence, hedge row, or shed set near the boundary should be placed from a drawing, not from where the old fence happened to be. A site plan gives you and the neighbor one document to agree on, which is the whole premise of Ergeon's good neighbor fence guide.
HOA approval. Most architectural review committees want a drawing showing where the project sits, and many ask for it regardless of whether the city requires a permit.
Getting comparable quotes. When three contractors price the same fence, a site plan makes sure they are all pricing the same line, footage, and gate count. Ergeon's guide on whether you can negotiate a fence quote explains why footage is the variable every bid depends on.

Who can prepare a site plan?

For residential permits, almost anyone, as long as the drawing is to scale, accurate, and complete. The options, roughly from slowest and most expensive to fastest and cheapest:

A licensed surveyor. Produces a certified site plan with field-measured boundaries. Required only when the permit office specifically asks for a certified or stamped plan, a variance is involved, or the boundary is disputed. Often $1,000 or more and one to three weeks. Ergeon's guide to property line survey cost covers what drives that number.
An architect or engineer. Standard for additions and new construction, where the site plan is one sheet in a larger set. Overkill for a fence or shed.
A local drafter. A scaled drawing from records and your sketch, typically $150 to $400 and several days.
An online drafting service. Many deliver a non-certified site plan in one to two days for roughly $89 to $259.
You. Many cities accept a hand-drawn, to-scale plan on a GIS parcel printout for simple residential lots. It is the most common reason for a resubmittal, and any property-line error is your responsibility.
Ergeon. A GIS-based site plan built from county parcel records and verified building footprints, delivered as a permit-ready PDF in about 15 minutes for $29, with one free revision if the permit office sends it back.

The full cost comparison is in Ergeon's guide to how much a site plan costs.

How do you get a site plan quickly?

Check the permit checklist first. Download the application for your project type and read the site plan requirements. If it says "certified" or "stamped," you need a surveyor. If it says "site plan" or "plot plan," a drafted plan will do.
Look for an existing drawing. Your closing packet may include a survey or plat you can trace from. Ergeon's guide on how to get a copy of your property survey lists where to look.
Order a GIS-based site plan. Ergeon's site plan pulls property lines, lot dimensions, and the building footprint from county records and aerial data, adds measured setbacks, adjacent parcels, scale, and a north arrow, and delivers a PDF in about 15 minutes for $29. The Project Planner tier adds a proposed fence layout you can mark up and turn into a free Ergeon quote.
Mark your project on it. Draw the fence, deck, or shed with heights and distances to each line. The Project Planner tier does the first pass for a fence.
Submit, and revise if asked. One free revision is included if anything on the plan does not match what your office wants.

One caveat applies to any site plan drawn from records: parcel data is a starting canvas, not a legal boundary determination. Only a licensed surveyor can establish your property line. For a permit and a cooperative neighbor, the drawing is enough. For a dispute, order the survey.

How does a site plan fit into an Ergeon fence project?

Ergeon uses the same GIS site plan as the base for its own permit filings, adding your fence layout and any other documents the city requires on top. If your fence needs a permit, the project manager handles the application after you approve the quote. The quote itself is built on a live video call without a sales visit: you draw the line on a satellite map, a specialist confirms slope, gates, access, and removal on camera, and the itemized price comes from a CAD model that carries real materials, quantities, labor, and live pricing. Ergeon is licensed, bonded, and insured in every market it serves, holds a 4.81 out of 5 rating across more than 22,000 verified reviews, and typically schedules builds within about 20 days of approval. See how it works or call 1-888-374-3661.

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FAQ

What is a site plan?
A scaled, top-down drawing of your lot showing property lines with dimensions, existing structures, your proposed project, and the setback distances between them, with a north arrow and scale. Permit offices use it to check a project against zoning rules.

When do you need a site plan?
For nearly any permit that adds or moves something on the lot: fences, decks, sheds, pools, additions, driveways. You also want one without a permit when a project runs along a property line, when an HOA has to approve it, or when you want several contractors pricing the same drawing.

Does a site plan have to be prepared by a surveyor?
Usually not. Most residential permit offices accept a scaled drawing from records. A surveyor-certified plan is required only when the checklist says certified or stamped, a variance is involved, or the boundary is disputed.

How much does a site plan cost?
From $29 for Ergeon's GIS-based plan in about 15 minutes, to roughly $89 to $259 from online drafting services, $150 to $400 from a local drafter, and $1,000 or more for a surveyor-certified plan.

Is a site plan the same as a plot plan?
For residential permits, yes. Plot plan is the older term for the same drawing. In a few jurisdictions a "certified plot plan" specifically means a surveyor-prepared document, so read your checklist.

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