What Is a Site Plan?
Quick answer
A site plan is a to-scale, bird's-eye drawing of your property showing the lot boundaries, everything already built, and the project you propose, with distances to the property lines labeled. Building departments use it to check setbacks, lot coverage, and easements before issuing a permit. Most homeowners have one drafted online for under $300, delivered in a day or two; a certified survey is only needed when your city specifically requires one.
If you have never pulled a building permit before, "site plan" is usually the first unfamiliar document on the application checklist. The good news: it is the simplest drawing in the whole permit package, and once you have seen one, you will never be confused by the term again.
What a site plan shows
Think of a site plan as a labeled map of your property, drawn from directly above. On a residential plan, the reviewer expects to find:
- Property lines, with your lot's dimensions written along them
- Existing structures: the house, garage, shed, driveway, anything already built
- The proposed project, drawn to scale in its exact location and dimensioned
- Setback distances: the measured gap between the project and each property line
- Easements that cross the lot, if any
- The basics block: north arrow, the drawing's scale, and your parcel number or address
Everything on the list exists for one purpose: letting the plan reviewer confirm your project's location follows the zoning rules without visiting your property.
What a site plan is used for
The main use is the one that brought you here: building permit applications. Departments ask for a site plan with almost any project that changes your property's footprint, a deck, fence, shed, patio, garage, pool, or addition.
The same drawing also gets used for:
- HOA approvals, which often mirror the city's application
- Contractor quotes, because an accurate lot drawing prevents surprises
- Variance requests, when you are asking the city for an exception
- Selling a home, where buyers ask what sits where relative to the lines
The code says: "Plans shall be drawn to scale and shall indicate the location, nature and extent of the work proposed."
In plain English: draw the lot from above, show what exists, add your project, and label the real distances.
Site plan vs blueprint vs floor plan
These get mixed up constantly, and the fix takes one sentence each:
- A site plan shows your property: the lot and where buildings sit on it.
- A floor plan shows the inside of a building: rooms, walls, doors.
- A blueprint (construction drawings) shows how something is built: framing, foundations, materials.
A permit application for a detached garage might need all three. A fence usually needs only the site plan. If your city's checklist says "plot plan," it almost always means the same thing as a site plan; see site plan vs plot plan vs survey for the full comparison.
What building departments check on it
Reviewers verify a short list, in roughly this order: setback distances against your zone's minimums, total lot coverage against the zoning cap, conflicts with easements, and whether the drawing is to scale with dimensions labeled. Then the basics block, because a plan with no scale or parcel number often gets returned unread.
Verify with your city: most building departments publish a one-page site plan checklist. Requirements genuinely vary, corner lots, flood zones, and historic districts add items, so compare any drawing against your city's own list before submitting.
Who draws site plans
For most residential permits, the practical answer is an online drafting service: a professional, to-scale drawing without surveyor prices or surveyor lead times. Ours run $89 to $259, delivered in 24 to 48 hours, drawn from county GIS records and satellite imagery that most departments accept for small residential work, with free revisions until your building department says yes.
The alternatives, and when they genuinely make sense:
- Drawing it yourself. Free if your time is free. You need your real lot dimensions (plat map, mortgage survey, or county GIS printout), the patience to draw to scale, and the willingness to redo it if the reviewer bounces it over a missing dimension. For a very simple project in a city that accepts hand-drawn plans it can work; run it against our Pre-Submission Checklist before you submit.
- A licensed surveyor. $400 to $800 or more, worth it only when your jurisdiction requires legally certified boundary locations. If you already have a survey from your home purchase, upload it with your order and we draft the site plan on top of it, which is the best of both.
- An architect or engineer, when the project already requires stamped construction plans and the site plan rides along with them.
For a deeper walkthrough, including why plans get rejected, read the complete guide to site plans for permits.
Frequently asked questions
Do I need a site plan for a building permit?
For most projects that change your property's footprint, yes. Decks, fences, sheds, patios, garages, pools, and additions almost always require one with the application. Interior-only work like a bathroom remodel usually does not. Your city's permit checklist will say explicitly, and it is worth checking because a missing site plan is one of the most common reasons applications stall.
What is the difference between a site plan and a survey?
A survey is a legally certified document prepared by a licensed land surveyor that establishes exact property boundaries. A site plan is a scaled drawing used for permit review that shows existing structures and the proposed project in relation to those boundaries, usually plotted from county records. Most small residential permits accept a site plan; surveys are for boundary disputes, new construction, and jurisdictions that specifically demand certification.
Can I draw my own site plan?
Often, yes. If your city accepts hand-drawn plans, your project is simple, and you have your real lot dimensions, a careful DIY drawing to a stated scale with every setback labeled can pass review. The honest math: it costs an afternoon plus the resubmission cycle if the reviewer finds a missing dimension, which is why many homeowners treat professional drafting at $89 as the cheaper path. If your project sits close to a setback line or your lot is irregular, professional drafting is also the safer one.
How much does a site plan cost?
Online drafting for residential permits typically runs under $300; ours are $89 to $259 depending on turnaround and revision terms, delivered in 24 to 48 hours. Drawing it yourself costs nothing except the time to measure, draw to scale, and redo it if the city bounces it. A licensed surveyor typically charges $400 to $800 or more, and is only necessary when your jurisdiction requires certified boundaries.
What scale should a site plan be?
Common residential scales are 1 inch = 10 feet or 1 inch = 20 feet, and many cities accept any clearly stated engineering scale that fits the lot on the sheet. What matters is that the scale is written on the drawing and the measurements genuinely match it. Some departments specify a scale and sheet size on their checklist, so check yours before drawing.
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.