Widening a driveway may look like a simple paving project, but the approval process can involve much more than pouring a wider strip of concrete. The project may change the driveway apron, curb cut, sidewalk crossing, parking layout, stormwater runoff and access through the public right-of-way.

A driveway widening site plan is a scaled, top-down drawing showing the existing driveway and the proposed widened area. It helps the city or county understand how the work fits on the property and whether it conflicts with property lines, sidewalks, street trees, utility equipment, drainage infrastructure or local parking rules.

Permit requirements vary by jurisdiction. Some local governments require approval whenever a driveway in the public right-of-way is installed, widened, relocated or repaired. Other authorities may allow work entirely within private property without a separate driveway permit, while still enforcing zoning, drainage, parking and impervious-surface requirements. [1][2][3][4]

Do You Need a Permit to Widen a Driveway?

You may need a driveway, curb-cut, sidewalk or right-of-way permit when the widening affects the portion of the driveway between the street and the private property.

A permit or formal review is especially likely when the project includes:

• Widening the curb opening
• Widening or replacing the driveway apron
• Removing part of a curb
• Reconstructing the sidewalk crossing
• Adding a second driveway entrance
• Relocating the existing driveway
• Creating access to a new garage or carport
• Converting a front yard into additional parking
• Working around a street tree, utility pole or hydrant
• Changing drainage inside the right-of-way
• Connecting to a public alley
• Connecting to a state-maintained road

Portland states that construction or repair of a driveway within the public right-of-way requires either a Minor Improvement Permit or Public Works Permit, depending on the project scope. The right-of-way section commonly includes the driveway area crossing the sidewalk and connecting to the street. [1]

Seattle requires a curb-cut permit when a new driveway opening is created through an existing curb. The curb-cut approval may be included with a larger construction permit or issued separately. [2]

Minneapolis requires plan review before certain residential curb-cut and driveway-apron work proceeds. A sidewalk inspection permit is also required for construction or repair involving driveway aprons, curbs, gutters and sidewalks. [3][5]

Austin identifies driveway permits as required for new construction, modification, repair or demolition of a curb, gutter or driveway approach inside the right-of-way. [4]

What Part of the Driveway Is Being Widened?

Before preparing the plan, separate the driveway into its main parts.

Private Driveway

The private driveway is generally the paved area located inside the property boundaries. It connects the property line to the garage, carport or parking area.

Driveway Apron or Approach

The driveway apron—also called the driveway approach—is the transition between the private driveway and the roadway.

It may cross:

• The public sidewalk
• A grass verge or planting strip
• The curb and gutter
• An open drainage ditch
• Other land within the public right-of-way

Because the apron is commonly located on public land, cities often control its dimensions, slope, construction material and inspection requirements.

Curb Cut

The curb cut is the lowered or removed section of curb that allows vehicles to enter the driveway.

Widening the private driveway does not necessarily mean the curb cut can also be widened. The curb opening may be limited to protect:

• Pedestrian safety
• Street parking
• Street trees
• Drainage
• Traffic visibility
• Utility equipment

Parking Pad

A parking pad is the widened area used to park a vehicle. It may be connected to the driveway or located beside a garage or carport.

A parking pad may still be regulated even when the curb cut remains unchanged. Local zoning rules may control where vehicles can park and how much of the front or side yard can be paved.

What Is a Driveway Widening Site Plan?

A driveway widening site plan shows the existing property layout and clearly identifies the additional area proposed for paving.

It allows permit reviewers to understand:

• How wide the driveway is now
• How wide it will be after construction
• Whether the curb cut or apron will change
• Where the additional vehicle will park
• How vehicles will reach the garage or parking area
• Whether the sidewalk will be affected
• Whether the paving is close to a property line
• Whether trees or public assets create conflicts
• How water will drain from the wider paved area
• Whether utilities or easements cross the project area

Portland’s driveway-permit policy calls for drawings showing proposed and existing driveways, curbs and sidewalks, along with property-line dimensions, street names, on-site structures and a north arrow. [6]

For driveway design exceptions, Portland requires a dimensioned site plan showing property lines, curb lines, sidewalks, the adjacent street, driveway widths, spacing between driveways, lot corners and nearby obstructions such as trees, signs and utility poles. [7]

What Should a Driveway Widening Site Plan Show?

The exact checklist depends on the permitting authority, but a clear residential plan commonly includes the following information.

Property Boundaries and Lot Dimensions

Show the complete legal outline of the property.

Include:

• Front property line
• Side property lines
• Rear property line
• Length of each boundary
• Lot width and depth
• Irregular or angled boundaries
• Property address

The property boundaries provide the reference points for locating the widening and checking whether paving setbacks apply.

Do not automatically assume that a fence, hedge or lawn edge marks the legal boundary. A boundary survey may be needed when the new paving will be close to a neighbouring property.

Street and Right-of-Way

Show the street serving the driveway.

Include where relevant:

• Street name
• Edge of pavement
• Curb and gutter
• Road shoulder
• Public right-of-way
• Road centreline
• Side street on a corner lot
• Public or private alley

The reviewer needs enough street information to understand how vehicles enter and leave the property.

Existing House and Structures

Show the existing house and other structures affecting the driveway layout.

These may include:

• House
• Garage
• Carport
• Shed
• Accessory dwelling unit
• Deck or patio
• Retaining walls
• Swimming pool
• Fences and gates

The drawing should clearly show which building or parking area the widened driveway will serve.

Existing Driveway

Draw and label the existing driveway before showing the proposed widening.

Useful labels include:

• Existing Driveway to Remain
• Existing Driveway to Be Widened
• Existing Driveway to Be Removed
• Existing Gravel Area

Show the current width at:

• The curb or road edge
• The front property line
• The narrowest point
• The garage or carport entrance

Proposed Widening Area

Clearly distinguish the additional paving from the existing driveway.

Use a label such as:

Proposed Driveway Widening

The new area can be identified with:

• Hatching
• Dashed outlines
• Different shading
• A bold proposed-work boundary

The reviewer should be able to tell what already exists and what will be added without performing a small archaeological excavation through the plan set.

Existing and Proposed Driveway Widths

Show written dimensions for both conditions.

For example:

• Existing driveway width: 10 feet
• Proposed widening: 8 feet
• Total proposed driveway width: 18 feet

Measure the width at several points where the driveway changes shape.

The curb-cut width, apron width and private driveway width may be different. Label each one separately.

Driveway Length

Show the approximate length of the widened area.

Dimension the distance from:

• Curb to property line
• Property line to garage
• Street to parking pad
• Beginning to end of the widening

The dimensions help calculate paved area and determine whether impervious-surface or drainage review applies.

Existing and Proposed Curb Cut

Show whether the curb opening will remain unchanged or be widened.

Use labels such as:

• Existing Curb Cut to Remain
• Proposed Curb-Cut Widening
• Existing Curb to Be Removed
• Existing Curb Cut to Be Closed

Dimension:

• Existing curb-cut width
• Proposed curb-cut width
• Flared or tapered sections
• Distance to side property lines
• Distance to nearby driveways
• Distance to the nearest intersection

Seattle advises applicants creating vehicle access to research driveway width, slope, manoeuvring space, sight triangles and curb-cut requirements. [8]

Driveway Apron

Show the driveway apron between the curb and private property.

Include:

• Apron width at the curb
• Apron width at the property line
• Side flares
• Sidewalk crossing
• Curb and gutter
• Apron material
• Proposed reconstruction limits

Minneapolis asks applicants to show the proposed apron’s size and location in relation to the street, sidewalk, property lines and surrounding public assets. [3]

Sidewalk

Show the public sidewalk where it crosses the driveway.

Include:

• Sidewalk width
• Existing sidewalk alignment
• Area proposed for reconstruction
• Driveway crossing
• Nearby pedestrian curb ramp
• Proposed changes in elevation

The widened driveway should preserve a safe pedestrian route and avoid creating an excessive cross-slope, abrupt step or vehicle overhang across the walkway.

Driveway Setbacks and Property-Line Clearances

Show the distance from the widened paving to:

• Side property line
• House
• Garage or carport
• Fence or gate
• Retaining wall
• Utility equipment
• Other paved areas

Minneapolis currently requires residential curb cuts to remain five feet from property lines unless the adjoining owner provides the required written consent. It also requires clearance from fixed objects in the right-of-way. These are Minneapolis-specific rules and should not be applied automatically elsewhere. [3]

Garage or Carport Connection

Show how the widened driveway connects to the existing garage or carport.

Include:

• Garage-door location
• Garage-door width
• Carport opening
• Driveway centreline where helpful
• Clearance beside walls or posts
• Existing and proposed vehicle paths

The widening should support a practical parking layout. A broad parking pad that narrows to one tiny garage approach can create an elegant concrete funnel with surprisingly little usefulness.

Related guidance is available in our articles on garage permit site plans and carport permit site plans.

Proposed Parking Spaces

Show where the additional vehicle will park.

Include where required:

• Parking-space outline
• Length and width
• Clearance from the sidewalk
• Access to the garage
• Distance from buildings and fences
• Vehicle direction

The plan should demonstrate that vehicles can park entirely on private property without blocking the sidewalk or extending into the public right-of-way.

Parking and Manoeuvring

Show how vehicles will enter, turn, park and leave.

The site plan may include:

• Parking spaces
• Turning area
• Hammerhead turnaround
• Reversing area
• Vehicle swept path
• Access to each garage bay

This information is especially useful on:

• Narrow lots
• Corner properties
• Steep driveways
• Busy roads
• Properties where backing into the street is restricted

Sight Distance and Sight Triangles

Drivers need clear visibility when crossing the sidewalk and entering the road.

Show nearby features that may block the view, including:

• Solid fences
• Retaining walls
• Hedges
• Utility cabinets
• Trees
• Buildings
• Changes in ground elevation

Where required, show the driveway sight triangle or sight-distance area.

Widening the driveway does not automatically solve a poor-visibility condition. The authority may limit the width or require landscaping and fencing changes.

Street Trees

Show every street tree close to the driveway or apron.

Include:

• Tree-trunk location
• Approximate canopy
• Distance from tree to proposed paving
• Tree-protection area
• Tree proposed for removal

Tree roots can conflict with excavation, apron construction and sidewalk replacement. Tree removal may require separate approval, and the driveway design may need to change to preserve the tree.

Utility Poles, Hydrants and Public Assets

Show public equipment located near the driveway.

This can include:

• Utility poles
• Streetlights
• Fire hydrants
• Traffic signs
• Water meters
• Utility cabinets
• Telecommunications pits
• Mailboxes
• Bus stops

Minneapolis requires residential curb cuts to remain at least five feet from fixed right-of-way structures such as hydrants, utility poles, signs, streetlights and trees. Again, this is a local example rather than a nationwide standard. [3]

Stormwater Inlets and Catch Basins

Show drainage infrastructure close to the curb cut.

Include where applicable:

• Catch basin
• Stormwater inlet
• Curb drain
• Gutter flow line
• Open ditch
• Culvert
• Stormwater pipe

Charlotte’s residential-lot review process checks driveway designs for conflicts with existing catch basins and reviews drainage and flooding issues when applicable. [9]

Surface-Drainage Direction

A wider driveway creates more hard surface and can redirect additional stormwater.

Show drainage-flow arrows indicating where water will travel.

The plan may identify:

• Flow toward the street gutter
• Flow toward an approved drain
• Existing swales
• Low points
• Areas where water may pond
• Direction of runoff from the garage

The proposed paving should not direct water into the garage, toward the house foundation or onto neighbouring property.

Driveway Slope and Profile

A top-down site plan may not be enough when the driveway is steep.

A driveway profile can show:

• Road elevation
• Top of curb
• Gutter elevation
• Sidewalk elevation
• Property-line elevation
• Driveway slopes
• Grade transitions
• Garage-floor elevation

The profile helps reviewers determine whether vehicles may scrape at the curb, sidewalk, driveway crest or garage entrance.

Portland requires a driveway-profile cross section where applicable for a driveway design exception. [7]

Positive Drainage

Driveways should generally be graded so water moves toward an approved drainage route rather than toward buildings.

Portland’s civil design guidance calls for driveways to have positive drainage toward the street and sufficient freeboard. Those detailed engineering standards apply within Portland and should not be treated as universal design specifications. [10]

Depending on the property, the design may need:

• Trench drain
• Channel drain
• Catch basin
• Swale
• Permeable paving
• Connection to an approved stormwater system

Impervious Area

Concrete, asphalt and most conventional pavers are treated as impervious surfaces because they prevent or reduce natural water infiltration.

The site plan may need to show:

• Total lot area
• Existing roof area
• Existing driveway area
• Proposed widening area
• Patios and walkways
• Total proposed impervious area
• Remaining landscaped area

Impervious-area limits and calculation methods vary by jurisdiction. Larger paved areas may trigger stormwater-management requirements.

Driveway Material

Identify the proposed paving material.

Options may include:

• Concrete
• Asphalt
• Interlocking pavers
• Permeable pavers
• Gravel where permitted
• Ribbon driveway

The public driveway apron may need to use a specific material and construction detail even when the private driveway uses another surface.

Easements

Show all known easements affecting the driveway area.

Common examples include:

• Utility easement
• Drainage easement
• Access easement
• Sewer easement
• Stormwater easement
• Shared-driveway easement

Label the width and purpose of each easement.

A driveway may cross an easement in some circumstances, but it must not interfere with legal access, underground infrastructure or maintenance rights.

Shared Driveways

Where the driveway is shared with another property, show:

• Shared driveway limits
• Access-easement boundaries
• Existing and proposed widths
• Property line through the driveway
• Parking and turning areas
• Areas affected by construction

A widening project should not restrict a neighbour’s recorded access rights or redirect drainage toward the adjoining property.

Underground Utilities

Show known services beneath or beside the proposed paving.

These may include:

• Water service
• Sewer lateral
• Gas service
• Electrical service
• Telecommunications line
• Stormwater pipe

Utility access covers, cleanouts and meters should remain accessible after the driveway is widened.

Underground utilities should be located through the appropriate local utility-location service before excavation begins.

Retaining Walls and Grading

Show retaining walls or earthwork needed to support the widening.

Include:

• Existing retaining walls
• Proposed retaining walls
• Wall height
• Cut and fill areas
• Driveway-edge protection
• Drainage behind the wall
• Distance to property lines

A widened driveway may place additional vehicle surcharge on a retaining wall. Structural engineering may be required where the wall supports parking or vehicle access.

See our guide on retaining wall permit site plans when wall construction forms part of the project.

Gates and Fences

Show any gate or fence affected by the widening.

Include:

• Gate location
• Clear opening width
• Gate-swing direction
• Fence sections proposed for removal
• Distance from the gate to the sidewalk

A gate should not swing across a public sidewalk or force vehicles to stop with their rear end projecting into the road.

Corner Lots and Intersections

Corner properties may have stricter driveway-location requirements.

Show:

• Both road frontages
• Intersection
• Curb-return radius
• Distance from driveway to corner
• Sight triangle
• Stop signs or signals
• Pedestrian curb ramps

Minneapolis currently requires a residential curb cut to remain at least 20 feet from the end of the street-intersection corner radius. This requirement is specific to Minneapolis. [3]

North Arrow and Drawing Scale

Include a north arrow and prepare the site plan at a consistent scale.

Possible residential scales include:

• 1 inch = 10 feet
• 1 inch = 20 feet
• 1 inch = 40 feet for larger properties

The plan should also include:

• Property address
• Drawing title
• Date prepared
• Revision number
• Drawing scale

Widening the Private Driveway Without Widening the Curb Cut

Some projects widen only the driveway or parking area inside the property while leaving the existing apron and curb opening unchanged.

The site plan should clearly state:

• Existing curb cut to remain
• Existing apron to remain
• Proposed widening begins inside property
• No work proposed in public right-of-way

This approach may reduce the right-of-way work, but it does not guarantee that the private widening is permitted. The zoning authority may still review:

• Front-yard parking
• Maximum paving width
• Landscaped-area requirements
• Property-line clearances
• Stormwater runoff
• Impervious-surface limits

Widening the Driveway Apron and Curb Cut

When the street connection is also widened, the project may require more detailed review.

The plan may need to show:

• Existing and proposed curb-cut widths
• Curb demolition limits
• New curb and gutter
• Sidewalk reconstruction
• Apron reinforcement
• Road and gutter elevations
• Drainage direction
• Temporary traffic and pedestrian control

Portland requires a permit for construction or repair of a driveway in the right-of-way. Austin likewise requires driveway approval for modifications to the driveway approach, curb or gutter. [1][4]

Adding a Second Driveway

A second driveway is often reviewed differently from widening an existing driveway.

The authority may consider:

• Whether a second access point is allowed
• Lot frontage
• Distance between driveways
• Street classification
• Available alley access
• Loss of street parking
• Pedestrian safety
• Tree and utility conflicts

Austin lists an additional residential driveway as a separate right-of-way permit category. [11]

The site plan should show both driveways and clearly state whether the existing driveway will remain, be reduced or be removed.

What Other Documents May Be Required?

A site plan may be only one part of the driveway-widening application.

The authority may also request:

• Driveway profile
• Apron and sidewalk cross section
• Vehicle swept-path drawing
• Photographs of the street frontage
• Civil-engineering drawings
• Drainage calculations
• Retaining-wall details
• Impervious-area calculation
• Sight-distance study
• Tree-protection plan
• Existing boundary survey
• Right-of-way permit application

Portland’s driveway design-exception process lists a site plan, driveway profile where applicable, photographs, civil drawings and other supporting information. [7]

Does Driveway Widening Require a Survey?

Not every driveway-widening project requires a new survey. An existing survey, house-location plan or recorded plat may provide a suitable base.

A new or updated survey may be needed when:

• The widening is close to a property line
• Property corners cannot be located
• The existing driveway may cross the boundary
• The driveway is shared
• An access easement is uncertain
• The permitting authority requests certified information

A drafted permit site plan is not a legal boundary survey and should not be represented as one.

Our guide on site plans versus surveys explains when a survey may be needed.

Common Driveway Widening Site Plan Mistakes

Applications are often delayed when the drawing does not clearly distinguish the existing driveway from the proposed work.

Common mistakes include:

• Property lines are missing
• The existing driveway is not shown
• The proposed widening is not clearly labelled
• Existing and proposed widths are missing
• The curb cut and private driveway are treated as the same width
• The driveway apron is omitted
• The sidewalk is not shown
• Parking spaces are unclear
• Vehicles would block the sidewalk
• The garage-door location is missing
• Sight-distance obstructions are ignored
• Street trees or utility poles are omitted
• Catch basins and curb drains are not shown
• Drainage direction is missing
• Impervious-area changes are not calculated
• Easements or underground utilities are omitted
• Retaining walls and grading are not shown
• The drawing is not to scale
• There is no north arrow
• The site plan conflicts with the contractor or civil drawings

What Information Is Needed to Prepare the Site Plan?

Collect as much of the following information as possible:

• Property address
• Existing driveway width and length
• Proposed total driveway width
• Width and length of the widening
• Existing and proposed curb-cut widths
• Driveway-apron dimensions
• Sidewalk location and width
• Garage, carport or parking location
• Proposed parking-space layout
• Driveway material
• Nearby trees, poles, hydrants and signs
• Nearby catch basins or stormwater inlets
• Known driveway slopes or elevations
• Drainage direction
• Retaining-wall or grading information
• Photos of the street frontage
• Rough sketch with measurements
• Existing survey or plot plan
• Known easements and utilities
• Permit-review comments

Driveway Widening Site Plan Checklist

Does a Site Plan Guarantee Approval?

No. A clear site plan gives reviewers the information needed to understand the widening, but approval still depends on local zoning, transportation standards, drainage, street design and property conditions.

The project may also require:

• Driveway or curb-cut permit
• Right-of-way permit
• Sidewalk inspection permit
• Zoning approval
• Stormwater or drainage review
• Civil engineering
• Retaining-wall permit
• Street-tree approval
• State highway access approval
• HOA or architectural-review approval

Need a Driveway Widening Site Plan?

Site Plan Pros prepares clear residential site plans for homeowners, paving contractors and permit applications.

Your driveway widening site plan can show:

• Property boundaries
• Existing and proposed driveway
• Driveway dimensions
• Curb cut and apron
• Sidewalk and public right-of-way
• Garage, carport and parking layout
• Drainage and grading
• Trees, public assets and utilities
• Easements and other relevant property details

You may also find our guides on driveway permit site plans, garage permit site plans, carport permit site plans and permit site plan checklists helpful.

Confirm the local curb-cut, apron, sidewalk, parking and drainage requirements before excavation or paving begins.

Sources

1. City of Portland — Driveways and Right-of-Way Permit Requirements
2. Seattle Department of Construction and Inspections — Curb Cut Permits
3. City of Minneapolis — Residential Curb Cuts and Driveway Approaches
4. City of Austin — Driveway and Right-of-Way Permit Types
5. City of Minneapolis — Sidewalk Inspection Permits
6. City of Portland — Sidewalk and Driveway Permit Plan Requirements
7. City of Portland — Driveway Design Exceptions
8. Seattle Department of Construction and Inspections — Parking and Driveway Design
9. City of Charlotte — Individual Residential Lot Reviews
10. City of Portland — Civil Design Guide for Public Street Improvements
11. City of Austin — Right-of-Way and Residential Driveway Permits
12. City of Charlotte — Residential and Commercial Driveway Permit Information
13. City and County of Denver — Modified Driveways and Curb-Cut Review
14. Fairfax County — Permits for Driveway Work in the State Right-of-Way