A site plan is a scaled drawing that looks down on an entire property and shows how a building sits within it. It maps the parcel boundaries, setbacks, existing and proposed structures, driveways, parking, landscape and levels. Planning departments treat it as the record of where construction is allowed to happen.
Almost every permit application starts with this one sheet, and almost every rejection letter mentions it. A floor plan describes a building; a site plan describes the ground it stands on and the rules attached to that ground. Once you can read one, the logic behind setbacks, driveway widths and grading makes sense, because all three are recorded in the same drawing.
What Does a Site Plan Show?
A site plan shows everything on the parcel that affects where and how you can build. Property lines with bearings and dimensions come first, followed by the buildable area left once required setbacks are subtracted. Footprints of buildings, drives, walks, patios, retaining walls, septic fields, wells, easements and street frontage sit on top of that.
Reviewers read it as a legal record, not a picture. Maricopa County's site plan submittal requirements ask for property lines and dimensions, actual setbacks, driveway and parking space dimensions, wells and septic locations, access and easements, and every existing building with its use. The county also refuses plans marked "preliminary" or "not for construction", because the sheet doubles as the zoning clearance record.
🎓 Expert Insight
"No house should ever be on a hill or on anything. It should be of the hill. Belonging to it. Hill and house should live together each the happier for the other." Frank Lloyd Wright, An Autobiography (1932)
Wright described an attitude, and the site plan is where that attitude becomes measurable. Contours, tree canopies and existing grades force a design to answer to the land instead of ignoring it.
Site Plan vs Floor Plan: What Is the Difference?
A floor plan cuts horizontally through a building, usually around 1.2 metres above the floor, and shows rooms, walls, doors and fixtures inside. A site plan never cuts anything. It views the property from directly above, roof and all, and its subject is the land. A section cuts vertically instead, to explain heights and levels.
Permit sets include all three because each answers a different question. The table below compares them.
Site Plan, Floor Plan and Section Compared
| Aspect | Site Plan | Floor Plan | Section |
|---|---|---|---|
| Viewpoint | Overhead, no cut | Horizontal cut through walls | Vertical cut through building |
| Subject | The whole parcel and its context | Interior layout of one level | Heights, floor levels, structure |
| Typical scale | 1:200 to 1:500 | 1:50 to 1:100 | 1:20 to 1:100 |
| Key content | Boundaries, setbacks, access, levels | Rooms, doors, windows, fixtures | Ceiling heights, slabs, roof pitch |
| Reviewed by | Zoning, planning, utilities, transport | Building code and life safety | Building code and structural |
Elements Every Site Plan Drawing Needs
Jurisdictions word their checklists differently, but the same items keep appearing. Treat the list below as the baseline, then add whatever your local authority asks for.
- Parcel boundaries with dimensions, taken from a survey rather than estimated from an online map.
- Required setbacks from front, rear and side lines, dashed so the buildable envelope reads clearly.
- A north arrow, since orientation drives solar access and shading.
- A stated scale plus a graphic scale bar, so the sheet still measures correctly after reduction.
- Spot levels and contours showing existing ground, plus proposed finished floor levels.
- Existing structures and proposed work separated by line weight or hatch.
- Vehicle access, driveway widths, turning space and parking bays with dimensions.
- Trees to be kept or removed, with trunk positions and canopy spread.
- Utilities and easements: water, sewer, septic fields, wells and overhead lines.
Separating existing from proposed is what beginners get wrong most often, and a clear graphic hierarchy fixes it. Our guide to line weight in architectural drawing covers those conventions. Symbols for trees, contours and site features also need to stay consistent, and ready-made site analysis symbols save a lot of redrawing.
💡 Pro Tip
Draw the setback envelope before you draw the building. Offset every property line inward by the required distance, hatch what remains, and design inside that shape. Architects who sketch a footprint first and check zoning later usually end up redrawing the whole plan once the surveyor's dimensions arrive.
How to Choose the Right Scale
Scale depends on lot size and on what the reviewer needs to measure. A suburban house reads well at 1:200, while a campus or rural parcel usually needs 1:500 or smaller. The UK Planning Portal states that a site plan is typically submitted at 1:200 or 1:500, while the wider location plan sits at 1:1250 or 1:2500.
Imperial jurisdictions set their own floors. The City of Portland's permitting guidance says 1 inch = 10 feet is the minimum scale accepted for site plans on residential building permits, and that the plan must cover the entire lot. Anything coarser than the stated minimum gets returned before review begins. If scale ratios still feel abstract, our breakdown of architectural drawing scales explains how 1:50 and 1:100 behave on paper.
📌 Did You Know?
UK planning applications use colour as legal notation. According to the Planning Portal, the site of the proposed development must be outlined in red on the location plan, and any other adjoining land owned by the applicant must be outlined in blue. Get the colours wrong and the application can be rejected as invalid before an officer looks at the design.
Permit Site Plan vs Concept Site Plan
Two very different drawings share the same name. A permit site plan is a legal instrument: measured, dimensioned, based on a boundary survey, and often carrying a professional stamp. Everything on it must be true and buildable, because inspectors check the finished work against it.
A concept site plan belongs to the design phase and to portfolios. It communicates intent: circulation, zoning of uses, views, prevailing wind, entry sequence. Colour, texture and hierarchy matter more than dimensional precision. This is the drawing that grows out of your site analysis, and it usually sits beside diagrams rather than construction documents. Our diagram resources are built for that stage of the work.
The mistake is submitting one when the other is required. A beautifully rendered concept plan with no dimensions will not clear zoning, and a bare permit plan will not carry a portfolio page.
Who Prepares a Site Plan?
It depends on complexity and jurisdiction. For a small residential addition, many authorities accept an owner-drawn plan as long as it is accurate, to scale and complete. Anything larger is normally produced by an architect or civil engineer working from a licensed surveyor's boundary and topographic survey.
The boundary survey is the foundation of the whole sheet. Dimensions, easements and existing levels come from it, and no amount of careful drafting fixes a plan built on guessed property lines. Where a professional seal is required, the sheet becomes a stamped architectural drawing and the person who sealed it carries responsibility for its contents.
How to Read a Site Plan Step by Step
Reading a site plan follows a repeatable order. The University of Connecticut's Center for Land Use Education and Research teaches this to local planning boards in its Fundamentals of Site Plan Reading training, and the sequence works just as well for students.
- Read the title block first for scale, date, revision and author.
- Find the north arrow and orient yourself against the street.
- Trace the property boundary and note its dimensions.
- Identify the setback lines and the buildable area inside them.
- Separate existing from proposed using the legend, not assumption.
- Follow contours and spot levels to understand which way water runs.
- Check access last: driveway, walkways, parking and service routes.
Common errors cluster in predictable places: missing north arrows, scales stated but never drawn as a bar, trees shown as bare circles with no canopy spread, and utilities sketched from memory. Portland's guidance warns applicants to verify utility positions before drawing them, since an incorrect line becomes an incorrect approval.
Zoning rules, setback distances and site plan submittal requirements vary by jurisdiction. Confirm the current checklist with your local building or planning authority before preparing a permit set.
Wrapping Up
Bottom Line: A site plan is the drawing that connects a design to a specific piece of land and to the rules attached to it. Get the survey, boundaries, setbacks, scale and levels right, and the rest of the drawing set has something reliable to stand on.
Frequently Asked Questions
Is a site plan the same as a plot plan?
The terms overlap, and many US jurisdictions treat them as the same document. Where a distinction exists, a plot plan is the simpler residential version showing boundaries, house footprint and setbacks, while a site plan adds grading, landscape, utilities and parking.
Do I need a survey before drawing a site plan?
For a permit submission, yes in practice. Boundary dimensions, easements and existing levels have to come from a licensed survey, because approvals depend on them being legally correct. Concept and study drawings can start from public parcel maps, which are not accurate enough for construction.
What scale should a residential site plan be drawn at?
Metric practice puts most residential site plans at 1:200 or 1:500. Imperial jurisdictions often set a minimum such as 1 inch = 10 feet. Check your local checklist first, then choose the largest scale that still fits the whole lot on the sheet.
Does a site plan show the inside of the building?
No. A site plan shows the building as a footprint or roof outline seen from above, and interior walls, rooms and doors belong on the floor plan. The only interior information that normally appears is the finished floor level, which ties the building to site grades.
Can I draw a site plan myself for a small project?
Many jurisdictions allow homeowners to submit their own site plan for minor residential work, provided it is drawn to an accepted scale, covers the entire lot, and shows accurate dimensions and setbacks. Commercial projects almost always require a licensed architect or engineer.
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