Site Plan vs Plot Plan vs Survey: Which One Does Your City Want?
Quick answer
For residential permits, site plan and plot plan mean the same document: a scaled, top-down drawing of your lot with your project and setback distances on it. A survey is different: a licensed land surveyor legally certifies where your boundaries are, at $400 to $800+ and 2 to 4 weeks. Most small residential projects only need the drawing. You need the survey when your city's checklist says certified or stamped, or your project hugs a boundary line.
Permit checklists across the country ask for a "site plan," a "plot plan," or a "survey," sometimes interchangeably, sometimes meaning very different documents with very different price tags. Order the wrong one and you either overpay by hundreds of dollars or get a correction notice. Here is the decoder.
The three documents in one minute
- A site plan is a scaled, top-down drawing of your lot for permit review: boundaries, existing structures, your proposed project, setback distances. Drawn by you, a drafting service, or a design professional. Boundaries are typically plotted from county records, not legally certified.
- A plot plan is, for residential permits, the same thing under an older name. Where a distinction survives, "plot plan" means the drawing of a single lot (your plot), while "site plan" can also describe multi-building or commercial sites. If that is the word your city used, our plot plan guide covers what one shows and how to get one for your property.
- A survey is a legal document, not just a drawing. A licensed land surveyor physically locates your boundaries, sets or verifies markers, and stamps the result. It certifies where the lines actually are.
The practical difference is certainty. The site plan says "here is the project on the lot, drawn to scale from the records." The survey says "a licensed professional certifies these boundary locations." Most residential permit reviews only need the first.
Side by side
| Site plan | Plot plan | Survey | |
|---|---|---|---|
| What it is | Scaled drawing for permit review | Same document, older residential name | Certified boundary determination |
| Who makes it | You, a drafting service, or a design pro | Same | Licensed land surveyor only |
| Boundary source | County GIS, plat, existing records | Same | Physical field measurement |
| Legally certified | No | No | Yes, stamped |
| Typical cost | Free to ~$300 | Same | $400 to $800+ |
| Typical time | Hours to 2 days | Same | 2 to 4 weeks |
| Cities accept for small residential permits | Usually | Usually | Always (exceeds requirement) |
What your city's application actually means
Reading the checklist language:
- "Submit a site plan / plot plan": a scaled drawing with setbacks labeled. Either name, same document. A permit-ready site plan satisfies both.
- "Certified survey," "stamped survey," "sealed by a licensed surveyor": the legal document. No drafting service can provide this, including us. You need a surveyor licensed in your state.
- "Site plan based on a current survey": the middle case. The city wants the drawing, but built on surveyed boundaries. If you have an existing survey from your home purchase, a drafting service can draw the site plan on top of it. If you have never had one, ask the department whether GIS-based boundaries are acceptable; for small projects, they often are.
- "Plat" or "plat map": the recorded subdivision map your lot belongs to. You do not create this; you get a copy from the county and it is a common source for your lot's dimensions.
The code says: "The site plan shall be based upon an accurate boundary line survey where required by the building official."
In plain English: the drawing is standard; the certified survey underneath it is only required when your building official says so.
Site plan vs floor plan
The fourth document people mix up is not a lot drawing at all. A floor plan looks inside a building; a site plan looks down at the whole property. They answer different reviewer questions, and a permit package for anything with walls usually needs both.
| Site plan | Floor plan | |
|---|---|---|
| What it shows | The whole lot from above: boundaries, existing structures, your project, setbacks | One level of one building from above: rooms, walls, doors, windows, fixtures |
| Question it answers | Is the project allowed to sit there? | Is what you are building inside code-compliant? |
| Reviewed by | Zoning and planning | Building and structural plan review |
| Typical scale | 1 inch = 10 or 20 feet | 1/4 inch = 1 foot |
| Shows property lines | Yes, always | No |
| Shows room dimensions | No | Yes |
Which ones your application needs follows the project:
- Fence, patio, deck, shed: a site plan, plus construction details or an elevation. No floor plan, because there are no rooms to draw.
- Detached garage or a workshop: usually both. The site plan proves the setbacks and lot coverage, the floor plan shows the footprint layout and door and window openings.
- Room addition, ADU, or new house: both, plus elevations, framing details and often a foundation plan. This is where the two documents most often get confused, because the checklist lists them one after the other.
The trap worth avoiding: a floor plan is not a substitute for a site plan, no matter how detailed it is. It contains no property lines, so it cannot show a setback, and setbacks are the single most common thing a residential reviewer checks. Sending a beautiful floor plan when the checklist asked for a site plan is a guaranteed correction notice.
When a survey is actually required
Expect to genuinely need a surveyor when:
- You are building a new house or a large addition
- The project sits within a foot or two of a setback line, where certified boundaries settle the question
- There is a boundary disagreement with a neighbor, or missing corner markers
- Your lender, title company, or jurisdiction explicitly requires a certified survey
- You are in a jurisdiction that simply demands surveys for all construction, which exists but is the exception
Outside those cases, paying survey prices for a fence or shed application is usually money the permit did not ask you to spend.
Which one do you need?
- Read your city's permit checklist for the exact words it uses.
- "Site plan" or "plot plan" and a small residential project: a scaled drawing is enough. Have one drafted in 24 to 48 hours from $89, or if your project is very simple and your city accepts sketches, the complete guide shows how to judge whether DIY is worth your afternoon.
- "Certified" or "stamped" anything: book a licensed surveyor in your state, then keep the survey on file; it makes every future project's drawing better.
- Still ambiguous: call the building department and ask one question: "Do you accept GIS-based site plans for this project type, or do you require a certified survey?" It is the fastest 3 minutes in the whole permit process.
New to the whole topic? Start with what a site plan is, or go deep with the complete guide to site plans for permits.
Frequently asked questions
Is a plot plan the same as a site plan?
For residential permit purposes, yes. Most building departments use the terms interchangeably, and a drawing that satisfies one satisfies the other. Where the terms are distinguished, a plot plan describes a single residential lot while a site plan can also cover larger or commercial sites.
Can I use my survey as a site plan?
Usually a survey alone is not enough, because it shows boundaries but not your proposed project. It is, however, the best possible base: a drafting service or a careful DIY drawing can add the project, dimensions, and setbacks on top of the surveyed boundaries, giving you the most defensible site plan available.
Will the city accept a site plan instead of a survey?
For most small residential projects, yes: decks, fences, sheds, patios, and small garages are routinely approved with scaled site plans built on county GIS data. When the checklist says certified or stamped survey, or your project sits right on a setback line, expect to need the real survey. When unsure, ask the department which they require for your project type.
Why do surveys cost so much more than site plans?
A survey is professional field work with legal liability: a licensed surveyor physically measures your property, reconciles it against recorded deeds, and certifies the result with a stamp. A site plan is drafting work based on existing records. You are paying for certainty and licensure, which is exactly why you should only buy it when the permit actually requires it.
What is a plat map, and is it a site plan?
A plat is the recorded map of your subdivision held by the county, showing how the land was divided into lots. It is not a site plan, but it is one of the best sources for your lot's true dimensions, and both DIY drawers and drafting services use it as a starting point.
What is the difference between a site plan and a floor plan?
A site plan shows your whole property from above: boundaries, existing structures, your proposed project and the setback distances to each property line. A floor plan shows the inside of one level of one building: rooms, walls, doors, windows and their dimensions. Zoning reviewers read the site plan to decide whether the project may sit where you put it; building reviewers read the floor plan to check what you are building. Projects with rooms, such as a garage or an addition, usually need both, and a floor plan never substitutes for a site plan because it contains no property lines.
Permit requirements vary by city, county, and state. The information in this guide provides general guidance based on common building codes and practices across the US. Always verify requirements with your local building department before starting your project.