Check the distance between your proposed deck and a property line, then compare it with a required setback.
Enter your planned distance from the property line and the setback required by your local zoning rules to see whether your proposed location appears to meet that distance.
Important: this tool compares distances. It does not determine the legally applicable zoning setback for your property.
Compare your planned distance with the required setback.
Measure the shortest horizontal distance from the applicable deck edge to the property line.
Enter the setback requirement that applies to your property and proposed deck.
Result
Result details.
Deck Planning Guide
A deck setback is the required separation between a proposed deck and a regulated boundary such as a property line, street, easement or other zoning reference point. Setbacks are used in land-use regulations to control where structures can be placed on a lot.
For a homeowner planning a new deck, setback requirements can become one of the most important site-planning considerations. A deck may physically fit in a backyard but still need to be moved because its proposed location does not satisfy the applicable zoning requirement.
The exact requirement is not universal. A municipality may have different front, side and rear setbacks, and the applicable requirement can depend on the zoning district, lot dimensions, property characteristics, deck design and other factors.
The purpose of Permitrust's deck setback calculator is therefore not to guess a universal setback. Instead, it gives you a simple way to compare a proposed distance with a setback value you have already identified from the applicable rules.
Step-by-Step
The calculator requires only two primary measurements.
Identify the property line or other boundary from which the setback is measured.
Enter the proposed horizontal distance between the deck and the applicable boundary.
Enter the setback distance specified by the applicable zoning rule.
The calculator tells you whether your entered distance meets or falls short of the entered requirement.
Simple Comparison
Once you know the applicable requirement, the comparison itself is straightforward.
Planned Distance
Distance to Boundary
Required Distance
Minimum Setback
Setback Difference = Planned Distance − Required Setback
A positive result means the entered distance is greater than the entered minimum. A zero result means the two distances are equal. A negative result means the proposed distance is less than the entered requirement.
Measurement
The basic concept is the shortest horizontal separation between the applicable part of the proposed structure and the regulated boundary. However, homeowners should not assume that every local regulation defines the measurement point in exactly the same way.
A property line is a legal boundary, not necessarily a visible fence. A fence, hedge, driveway edge or landscaping feature should not automatically be treated as the property line.
This distinction matters because an inaccurate boundary measurement can make an otherwise correct setback calculation misleading.
If the exact location of the property line is uncertain, consult your property survey, recorded documents or another reliable source before relying on a measured setback.
Different Setbacks
A property can have different setback requirements depending on which boundary the deck approaches.
Front-yard restrictions can be affected by streets, right-of-way boundaries, lot configuration and zoning requirements.
Side-yard requirements determine how close a proposed structure can be to the side property boundary.
Rear-yard setbacks are particularly relevant to backyard decks, but the exact requirement varies by location and zoning district.
Why It Matters
Setbacks affect where you can place the deck on your lot. This makes them a design issue as well as a permitting issue.
Discovering a setback problem after the deck has been designed or materials have been purchased can force expensive changes. Moving the deck may affect stairs, doors, landscaping, drainage, framing and the overall usable size of the structure.
Checking the applicable setback early gives you a better chance of identifying constraints before investing heavily in a design.
This is especially important for smaller lots, corner lots, irregular parcels and properties where easements, rights-of-way or other restrictions may affect the usable building area.
What Can Change the Requirement?
Different zoning districts can have different dimensional requirements.
Lot width, depth and configuration can affect how a structure fits within required setbacks.
Some regulations distinguish between structures based on their height or other characteristics.
Local rules may treat attached and detached structures differently.
A recorded easement can create additional limitations on where construction can occur.
Corner properties may have additional front-yard or street-related constraints.
Property Boundaries
A setback calculation is only as reliable as the boundary from which the measurement is taken. If you believe the fence marks the property line but the actual boundary is several feet away, your calculated distance can be wrong.
When available, a current property survey can provide useful information about lot boundaries. Depending on the project, additional information may be available through local property records or other official sources.
Do not move, remove or alter a property boundary marker based solely on an online calculation. If the boundary is disputed or uncertain, obtain appropriate professional assistance.
Important Distinction
A zoning setback and a building-code requirement are not the same thing. A zoning setback generally controls where a structure may be located on a parcel. Building codes address construction and safety requirements.
A deck project may need to satisfy both. Meeting a zoning setback does not automatically mean the proposed deck satisfies structural or safety requirements.
Depending on the project, you may need to consider structural framing, footing design, stairs, guards, handrails, connections, loads and other construction details separately.
Avoid Mistakes
Setback rules vary by jurisdiction and property. A number found online for one municipality should not automatically be applied to another.
A fence is not necessarily located exactly on the legal property boundary.
A property can contain recorded restrictions that affect where construction can occur even when the proposed deck appears to satisfy a basic property-line setback.
A mathematical comparison does not replace review by the authority responsible for zoning or permits.
If Your Deck Falls Short
A setback problem does not necessarily mean the project must be abandoned. The first step is to confirm that you are using the correct zoning requirement and measuring from the correct boundary.
If the requirement is confirmed, you may need to modify the deck layout or move the proposed structure farther from the boundary. Depending on local regulations, certain exceptions or approval processes may also exist.
Do not assume that a variance, exception or administrative approval will be available. Those options are jurisdiction-specific and may have their own eligibility requirements.
Verify the Rule
Confirm the Boundary
Adjust or Seek Approval
Before You Build
Setback is only one part of determining whether a deck can be constructed as proposed. Depending on the location, the project may also involve zoning restrictions, building-code requirements, structural requirements and permit procedures.
If you are preparing a real deck project, verify the rules that apply to your specific property before finalizing the design or purchasing materials.
Frequently Asked Questions
Check your proposed setback first, then verify the zoning, building and permit requirements that apply to your property.
Check Your Deck Permit Requirements