# Prince William County, VA Site Plans — Zoning Approval and the 256 Sq Ft Rule
If you are planning an exterior project in Prince William County, you need to understand the difference between a building permit and zoning approval.
Many homeowners read that small sheds don't need a building permit and assume they can start digging. That is a costly mistake. In Prince William County, zoning approval is required for ALL exterior projects, regardless of size.
To get that approval, you need a house location survey plat. Here is what the Department of Development Services expects to see when you log into the ePortal.
Do You Need a Site Plan for a Small Permit in Prince William County?
Yes. To obtain zoning approval for a fence, shed, deck, or patio, you must submit a house location survey plat.
This is not a casual sketch. The county requires that the plat be:
- Full-size and to-scale (an engineer's scale, typically 1″ = 50′ minimum, is recommended).
- Clearly showing the surveyor's seal, signature, and scale used for the base drawing.
- Annotated with your proposed structure drawn to-scale.
- Annotated with the exact dimensions of the new structure and the exact distances to all property lines.
- The proposed structure must be highlighted.
(If you are applying in-person rather than through the ePortal, you must provide 2 copies of the draft drawing).
Who Runs Into This in Prince William County
- Shed builders who assume their 10x10 shed is completely unregulated, only to receive a code violation for failing to get zoning approval.
- Fence installers who don't realize that Prince William County requires zoning approval for fences of any height.
- Homeowners who try to submit a hand-drawn rectangle on blank paper instead of annotating their official house location survey plat.
- Contractors applying on behalf of a homeowner without the required Special Power of Attorney Affidavit.
What Needs a Site Plan in Prince William County
- Fence permit site plan — Zoning approval required for fences of ANY height. Must draw the fence to scale on the survey plat and state height and materials.
- Shed permit site plan — Zoning approval required for ALL sheds. Building permit required only if over 256 sq ft. Must show the 5-foot minimum side/rear setbacks.
- Deck permit site plan — Zoning approval required for ALL decks. Building permits required for attached decks, and detached decks over 200 sq ft or 30 inches above grade.
- Pool permit site plan — Required. Must show pool location, equipment, barriers, setbacks, and floodplain notation.
- Garage permit site plan — Required. Needs both zoning approval and building permits.
- Addition permit site plan — Required. Must show existing house, addition footprint, setbacks, and often a full grading plan.
Why This Trips People Up in Prince William County
The 256 Square Foot Rule. Prince William County exempts sheds from building permits if they are 256 square feet or less (and don't include electrical/plumbing). Because they don't need a building permit, footings/foundations aren't required by code. However, you still absolutely must obtain zoning approval, which requires submitting the site plan to prove you are meeting setbacks.
Missing the Surveyor's Seal. The base document you draw your deck or shed on must be an official house location survey plat. If the county cannot see the original surveyor's seal, signature, and scale on the document, they will reject it.
Deck Roofs. If you decide to add a roof to your deck, Prince William County no longer considers it a deck. It is now considered an addition, which triggers stricter setback requirements and more complex permitting.
Zoning and Setbacks in Prince William County
Setbacks depend heavily on your specific zoning district (e.g., SR-1, SR-2, A-1).
General Guidelines for Accessory Structures (Sheds):
- In most rear yards, sheds must be at least 5 feet from the side and rear property lines.
General Guidelines for Additions (e.g., Semi-Rural Residential Districts):
- Front setback: 50 feet minimum
- Rear setback: 25 feet minimum
- Side setback: 15 feet minimum
- Note: Homes in older Residential Planned Community (RPC) districts built before 1991 may have different allowances.
Well and Septic Setbacks:
The Health Department recommends a setback of at least 10 feet from the well and drain field for any new structures.
How the Tool Handles This — 5 Steps
SitePlans.ai loads Prince William County parcel data to help you visualize your layout before you mark up your official survey plat:
- Enter your address — Lot lines load from the County Mapper GIS data.
- Place your project — Add your shed, fence, or deck to the lot.
- Verify the 5-foot rule — Use the tool's measuring features to ensure your shed meets the 5-foot side/rear setback requirement.
- Identify easements — Note any known utility or private access easements.
- Export a conceptual plan — Use this scaled PDF as a guide to perfectly annotate your official, sealed house location survey plat for the ePortal upload.
Where This Tool Fits — and Where It Doesn't
| Situation | Best path |
|---|---|
| Brainstorming a shed or deck | SitePlans.ai for visualizing layout and checking the 5ft setback |
| ePortal Zoning Approval | You must annotate an existing sealed house location survey plat |
| Property with no existing survey | Licensed VA Surveyor required to create a new house location plat |
| New home construction | Licensed Civil Engineer/Surveyor required (Full Lot Grading Plan) |
| Retaining walls over 3'11" | Engineering details required for zoning review |
What This Doesn't Replace
SitePlans.ai helps create preliminary, conceptual site plans. It does not replace the requirement to use an official house location survey plat bearing a surveyor's seal. If you do not have a copy of the plat you received when you closed on your house, and you cannot obtain one from the county records, you must hire a licensed Virginia surveyor to create one. You cannot submit our software's output in lieu of a sealed survey plat.
Comparison: Your Options for a Prince William County Site Plan
| Method | Cost | Time | Stamp | Notes |
|---|---|---|---|---|
| Existing house plat + hand draw | Free | 1 hr | ✅ (pre-existing) | The required method for ePortal zoning approval for fences/sheds/decks |
| SitePlans.ai | Free first plan | Minutes | ✗ | Best for conceptual layout and practicing before drawing on your official plat |
| Licensed VA Surveyor | $600–$1,500+ | 2–4 weeks | ✅ | Mandatory if you lost your original house location plat |
| SitePlans.us (done-for-you) | Custom | 1–3 days | ✗ | We can digitally overlay your project onto your existing PDF survey plat |
Common Mistakes That Delay Prince William County Permits
- Applying for a building permit first — You must secure zoning approval before you can get a building permit.
- Forgetting fences need approval — Assuming that because a fence is low, it doesn't need zoning approval. Fences of any height require it.
- Not drawing to scale — Hand-drawing a massive deck on the survey plat that is clearly not proportionate to the scale noted by the surveyor.
- Missing distance measurements — Submitting a site plan that shows the shed, but failing to write in the exact distance (e.g., "5 ft") from the side and rear property lines.
- Contractor applying without POA — If your fence company applies for you, they must include the Special Power of Attorney Affidavit.
Support and Local Resources
- Prince William County Development Services — pwcva.gov/department/development-services
- Prince William County ePortal — eportal.pwcgov.org — for all digital submissions
- County Mapper (GIS) — gisweb.pwcgov.org/webapps/countymapper/
- Zoning Division — (703) 792-6830 or zoningcounters@pwcgov.org
- FEMA Flood Maps — msc.fema.gov
Nearby Counties
Frequently Asked Questions
1. Does a 10x10 shed need a permit in Prince William County?
It does not need a building permit because it is under 256 square feet. However, it absolutely requires zoning approval, which means you still have to submit an application and a house location survey plat through the ePortal.
2. Can I draw my own site plan for a deck?
You can draw the proposed deck onto a copy of your official, sealed house location survey plat. You cannot draw the entire property from scratch on a blank piece of paper.
3. What if I don't have a house location survey plat?
If you cannot find the one from your closing documents, and the county does not have one on file, you will be required to hire a licensed Virginia surveyor to create a new one before you can get zoning approval for your project.
4. How close to the property line can I put a fence?
While fences can often go up to the property line, they require zoning approval regardless of height. Your site plan must show the fence location, height, materials, and prove it does not block required easements or sightlines on corner lots.
5. How close can my shed be to the property line?
In most rear yards, accessory structures like sheds must be set back a minimum of 5 feet from the side and rear property lines.
6. Do I need a site plan if I am just finishing my basement?
No, a site plan is for exterior work. For a basement finish, you need building plans and a floor plan showing room dimensions, square footage, and intended uses.
7. How do I submit my site plan?
Prince William County handles applications digitally through the ePortal system. You will upload your annotated house location survey plat as a PDF.
8. Can I use SitePlans.ai for Prince William County?
Because the county requires the original surveyor's seal on the base document, you cannot submit our software's standard output directly. However, you can use our tool to verify your layout and setbacks. If you need help digitally drawing your project onto your existing PDF survey plat so it looks professional for the ePortal, our team at SitePlans.us can do that for you.
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