Mesa Site Plan for Permit: Easements & Coverage

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Planning a home addition, detached garage, casita, patio cover or other residential project in Mesa? Your permit application may require a site plan showing the property boundaries, existing buildings, proposed construction, recorded easements and total lot coverage.

A clear site plan for a permit in Mesa, AZ helps reviewers understand how much of the property is already developed and whether the proposed work could conflict with an easement or exceed the allowed building coverage.

When Does Mesa Require a Site Plan?

The City of Mesa requires a fully dimensioned site plan for many residential permit applications. The City’s residential construction guidance lists site plans among the required documents for additions, accessory structures, swimming pools, new homes and several other project types.

A site plan allows City staff to review:

• The location of existing and proposed structures
• Distances from buildings to property lines
• Applicable zoning setbacks
• Recorded easements and rights-of-way
• Access, driveways and parking areas
• The amount of the lot occupied by buildings
• Whether additional planning approval may be required

The site plan is only one part of the permit package. Depending on the project, Mesa may also require floor plans, elevations, structural details and electrical, plumbing or mechanical drawings.

Confirm the Correct Permitting Jurisdiction

A Mesa mailing address will usually be within the City of Mesa, but some nearby properties can be in an unincorporated area of Maricopa County or another jurisdiction.

Maricopa County explains that projects within unincorporated County areas must use the County permitting process. Projects within an incorporated city normally begin with that city or town.

Confirm the jurisdiction before preparing your application. This helps ensure that the correct zoning rules, lot-coverage standards and permit forms are being used.

What Should a Mesa Permit Site Plan Show?

A residential site plan should provide an understandable overhead view of the complete lot. The exact details depend on the project, but the following information is commonly useful.

Property Lines and Lot Dimensions

Show the full property boundary with the available dimensions for each side of the lot. The property line should be visually different from easement boundaries, setback lines and building outlines.

Existing Buildings

Identify the footprint of the existing house and other significant structures, including:

• Attached and detached garages
• Sheds and workshops
• Accessory dwelling units
• Covered patios and porches
• Carports
• Pool houses and similar structures

Proposed Construction

Clearly label the proposed addition or detached structure. Show its overall dimensions and distances to the relevant property lines and existing buildings.

Setbacks

Show the applicable front, side, rear and street-side setbacks. Setbacks and lot coverage are different requirements, and a project generally needs to comply with both.

Recorded Easements

Identify known utility, drainage, access and other recorded easements. Include the easement width and recording information when it is available.

Driveways and Parking

Show the driveway and relevant parking areas, especially when the proposed project affects a garage, carport, driveway or vehicle access.

North Arrow and Scale

Include a north arrow and an appropriate drawing scale. A fully dimensioned plan makes it easier for reviewers to check the proposed layout.

What Is an Easement?

An easement allows a utility provider, public agency, neighboring owner or another authorized party to use a defined portion of the property for a particular purpose.

Common residential easements include:

• Utility easements: Used for water, sewer, electric, gas or communication services.
• Drainage easements: Reserved for stormwater flow or drainage facilities.
• Access easements: Allow people or vehicles to cross part of a property.
• Public rights-of-way: Areas reserved for roads, sidewalks and public infrastructure.

The City of Mesa’s platting guidance requires easements and their limitations to be identified on recorded plats. Mesa’s standard plat language also limits construction within many easements to utilities and certain removable fencing unless another approval applies.

That means an apparently open part of the backyard may not be available for a permanent garage, shed, casita or addition.

Where Can You Find Easement Information?

Easements may appear in several documents:

• A recorded subdivision plat
• A boundary survey
• The property deed
• A title commitment or title report
• A separately recorded easement document
• A previously approved site plan

Look for labels such as PUE, public utility easement, drainage easement, access easement or right-of-way.

Online parcel maps can assist with general research, but they may not show every recorded easement. Review the recorded property documents when the proposed project is near a lot boundary or easement.

What Is Lot Coverage?

Lot coverage describes how much of the property is occupied by buildings and other features counted as covered area under the applicable zoning rules.

A basic coverage calculation is:

Covered building area ÷ total lot area × 100 = lot coverage percentage

For example, if the existing home and all other counted structures occupy 3,000 square feet of a 10,000-square-foot lot, the basic coverage calculation would be 30%.

This example explains the calculation only. It does not establish the maximum coverage allowed on a Mesa property.

What May Count Toward Lot Coverage?

The City’s current zoning definition and the property’s zoning district determine what must be included. Depending on the applicable rules, counted coverage may involve:

• The main house
• Attached garages
• Detached garages and workshops
• Accessory dwelling units
• Sheds and accessory buildings
• Covered patios and porches
• Carports
• Roofed additions
• Other covered structures

Open driveways, uncovered patios, swimming pools and roof projections may be treated differently from fully roofed buildings. Confirm the current Mesa definition before making the final calculation.

Why Lot Coverage Can Stop a Project

A proposed structure can meet every required setback and still exceed the maximum lot coverage. This is why the site plan should show all existing and proposed roofed structures—not just the new project.

Lot-coverage problems are more common when a property already has:

• A large existing home
• Several detached structures
• A garage conversion or previous addition
• Large covered patios
• A carport
• An accessory dwelling unit
• Unpermitted structures that were not shown on older plans

Before designing an addition, calculate the existing coverage and determine how much additional building area may be available.

Lot Coverage Is Not the Same as Impervious Area

Lot coverage and impervious area are related but different measurements.

Lot coverage generally focuses on buildings or roofed structures counted under the zoning code.

Impervious area may include surfaces that prevent water from soaking into the soil, such as buildings, concrete driveways, walkways and patios.

A project may therefore have one percentage for building coverage and another for total impervious surface. Drainage or flood-control review may require additional calculations.

Mesa Permit Requirements for Common Projects

The City’s residential construction guidance identifies several projects that require permits, including:

• Home additions
• Carport and patio enclosures
• Detached structures over 200 square feet
• Structures with electrical, plumbing or mechanical systems
• Swimming pools
• New residential construction
• Conversions of non-livable space into living space

Mesa states that a detached shed or playhouse under 200 square feet without utility connections may not require a construction permit. However, height and location requirements still apply.

A permit exemption does not automatically allow a structure inside an easement or beyond a zoning limitation.

Property Lines Must Be Accurate

Easement and coverage information depends on an accurate lot boundary. Do not assume that a wall, fence, curb or landscaping edge marks the legal property line.

Useful sources include:

• A recent boundary survey
• The recorded subdivision plat
• A previously approved plot plan
• Title and deed records

If the project is close to a property line or easement, obtain a survey from an Arizona-licensed land surveyor. USA Site Plans does not establish legal boundaries.

Information to Collect Before Ordering

Please gather the following information:

1. The complete Mesa property address
2. The applicable City or County jurisdiction
3. A survey, recorded plat or previous site plan
4. The total lot dimensions or lot area
5. The dimensions of existing roofed structures
6. The dimensions of the proposed project
7. Distances from the project to property lines
8. Known easement locations and widths
9. Property and project-area photographs
10. A simple sketch showing the proposed location
11. Any permit checklist or correction notice

The sketch can be hand drawn. Clearly identify the existing home, proposed construction, driveway, property lines and any known easements.

How USA Site Plans Can Help

USA Site Plans prepares clear residential site plans using available property records, customer measurements and project details.

Your Mesa site plan can show:

• The property boundary and available lot dimensions
• The existing home and accessory structures
• The proposed addition or detached building
• Setback dimensions
• Known easements
• Driveways and adjacent streets
• Existing and proposed building areas
• A basic lot-coverage calculation when requested
• Scale, labels and north arrow

Our standard drafting service offers a 24-hour turnaround after complete information has been received. If the permit reviewer requests a correction to information shown on the plan, send us the written comments so we can review the requested revision.

Frequently Asked Questions

Does every Mesa permit require a site plan?

No. Requirements depend on the project. However, Mesa lists a fully dimensioned site plan among the required documents for additions, accessory structures, swimming pools and new residential construction.

Can I build a shed inside a utility easement?

Do not assume that construction is allowed. Review the recorded easement and contact the City and easement holder. The shed may need to be relocated.

Does a small shed count toward lot coverage?

It may. Permit exemptions and zoning calculations are different. A structure that does not require a construction permit can still be subject to location, height and lot-coverage requirements.

Does the driveway count as lot coverage?

A driveway may not be treated the same as a roofed building for zoning lot coverage, but it can count as impervious area for other reviews. Confirm the applicable definition for your project.

Can USA Site Plans calculate lot coverage?

Yes. We can prepare a basic calculation when reliable lot dimensions and complete building-footprint information are available. The City makes the final determination about which areas count.

Can a site plan legally locate my property line?

No. Only a licensed surveyor can professionally establish or verify a legal boundary. Our plans use the property information supplied by the customer and available records.

Order Your Mesa Site Plan

A clear site plan can help identify easement conflicts and potential lot-coverage issues before construction begins. Showing the complete property, existing buildings and proposed project makes the permit package easier to understand.

Send us your property documents, measurements and project sketch. We will convert the information into a clean drawing suitable for many straightforward residential permit applications.

Official Mesa Resources

• City of Mesa Residential Construction
• Mesa Residential Construction FAQs
• Mesa Development Codes and Zoning Regulations
• Mesa Final Plat and Easement Requirements
• Maricopa County Permit Center

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