Mississauga detached garage site plan showing the proposed garage, existing dwelling, property boundaries, setbacks, driveway access and lot coverage — Example Mississauga detached garage site plan showing the proposed garage, existing dwelling, property lines, driveway access, setbacks, landscaping and lot-coverage calculations. The sample address, zoning and dimensions are illustrative and must be verified for the actual property.

Mississauga Detached Garage Site Plan for Permit: Setbacks, Access and Lot Coverage

A detached garage can provide secure vehicle parking, workshop space and additional storage without changing the footprint of the existing house. Before construction begins, however, the proposed garage must fit within Mississauga’s zoning rules, building-permit requirements and property-specific restrictions.

A clear Mississauga detached garage site plan shows how the garage relates to the legal property boundaries, existing dwelling, driveway, landscaping, easements and neighbouring streets. It also provides the dimensions and site statistics needed to review setbacks, access and lot coverage.

Preparing the plan early can reveal zoning or construction issues before money is committed to excavation, concrete, framing or driveway work.

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Does a Detached Garage Need a Building Permit in Mississauga?

Yes. The City of Mississauga specifically lists a detached garage as a project that requires a building permit.^[1]

The permit allows City reviewers to check the proposal against:

the Ontario Building Code;
Mississauga Zoning By-law 0225-2007;
structural and foundation requirements;
spatial-separation and fire-safety requirements;
property-specific zoning provisions;
grading and drainage requirements; and
other applicable laws and approvals.

The permit must be issued before garage construction begins.

Do not start excavation or foundation work using only a contractor’s sketch. The issued permit and approved drawings establish the garage location and construction that the City has accepted.

What Is a Detached Garage Site Plan?

A detached garage site plan is a scaled overhead drawing of the property. It shows the proposed garage in relation to the existing house, legal property lines, driveway, streets, easements and other site features.

For accessory structures such as detached garages, the City requires the site plan to include:

a metric drawing scale;
a north arrow;
the municipal address;
the legal lot and plan description;
existing buildings labelled as existing;
the new garage hatched and labelled “PROPOSED”;
dimensioned property lines;
overall garage dimensions;
rights-of-way and easements;
landscaped areas;
driveways, walkways and other hard surfaces;
setbacks from all property lines;
lot area and frontage;
lot coverage in square metres and as a percentage;
a breakdown of what is included in lot coverage;
driveway width;
driveway setback from adjoining property lines;
driveway surface material;
walkway attachments to the driveway; and
established-grade information.^[2]

The site plan explains where the garage will be placed. Separate floor plans, foundation plans, roof plans, elevations and construction details explain how it will be built.

Important Corrections to the Featured Image

The featured image is an educational example. It is not a survey, zoning certificate or approved permit drawing.

Rear-yard setback

The image identifies a minimum rear-yard setback of 1.20 metres. That is not the general minimum for the illustrated lot.

Under the current general garage provisions:

a detached garage in the rear yard on a lot of at least 750 m² generally requires 1.20 metres from the interior side and rear lot lines; and
a detached garage in the rear yard on a lot under 750 m² generally requires 0.61 metres from the interior side and rear lot lines.^[3]

The image shows a 464.5 m² lot. Its setback labels should therefore not state that 1.20 metres is the minimum.

Interior side-yard setback

The image states that the minimum interior side-yard setback is 0.90 metres. For a garage located in the rear yard on the illustrated lot, the current general garage provision is 0.61 metres.

If the garage is located in an interior side yard rather than the rear yard, the interior side-yard regulation of the property’s actual zone applies.^[3]

Exterior side-yard setback

The illustrated 2.40-metre exterior side-yard minimum should be labelled as an example only.

The current garage table does not establish one universal 2.40-metre requirement. It says the exterior side-yard regulation of the applicable zone must be followed.^[3]

Lot coverage

The image identifies 45% as a typical maximum total lot coverage. That may not be correct for the actual property.

Two separate calculations must be checked:

Detached garage coverage: the general maximum is 10% of lot area.
Total property coverage: the dwelling, garage and other qualifying structures must remain within the maximum coverage established by the property’s zone.^[3]

The site statistics should show the detached garage separately and then provide the total coverage for all buildings included in the zoning calculation.

Zoning designation

The sample “R2-XX” label should not be treated as a confirmed current Mississauga zone.

Replace it with:

“Zoning: verify using the City of Mississauga property information tool, including any exception-zone provisions.”

Mississauga Detached Garage Setbacks

The required setback depends on:

the garage’s location within the lot;
the total lot area;
whether the lot is an interior or corner lot;
the property’s zoning designation;
any zoning exception applying to the property;
adjacent Greenlands zoning;
easements and rights-of-way; and
whether a joint garage is proposed on adjoining lots.

Garage condition	General requirement
Rear-yard garage on lot under 750 m²	At least 0.61 m from interior side and rear lot lines.
Rear-yard garage on lot of at least 750 m²	At least 1.20 m from interior side and rear lot lines.
Garage in an interior side yard	The interior side-yard regulation of the applicable zone applies.
Garage beside an exterior side lot line	The exterior side-yard regulation of the applicable zone applies.
Garage-to-dwelling separation	At least 1.20 m for a detached garage in the rear yard.

These are general provisions. A property-specific zone or exception can impose a different requirement.

Where Can the Garage Be Located?

A detached garage is generally not permitted between the front wall of the dwelling and the front lot line.^[3]

That means the garage will commonly be located:

behind the front wall of the house;
within the rear yard;
within a permitted interior side-yard area; or
in another location specifically permitted by the property’s zone or exception.

The site plan should dimension the garage from:

the rear lot line;
each relevant side lot line;
the existing dwelling;
other accessory buildings;
the street on a corner lot;
registered easements; and
known underground infrastructure.

Maximum Garage Floor Area

The current general maximum floor area for a detached garage is 75 m², measured from the inside face of the walls.^[3]

A smaller garage may still fail zoning review if it:

exceeds the detached-garage lot-coverage limit;
causes the property to exceed total lot coverage;
does not meet required setbacks;
is too high;
is located in a prohibited part of the lot;
interferes with an easement; or
does not provide compliant access and parking.

Detached Garage Lot Coverage

Lot coverage is the portion of a property covered by qualifying buildings and structures.

For a detached garage, the general maximum garage coverage is 10% of the lot area.^[3]

The site plan should show:

the total lot area;
the existing dwelling footprint;
the detached garage footprint;
other structures included in coverage;
the garage coverage calculation;
the total covered area; and
the resulting total lot-coverage percentage.

Example from the image

The sample image uses:

a lot measuring 15.24 m by 30.48 m;
an existing dwelling footprint of 142 m²; and
a proposed garage footprint of 36 m².

These numbers are examples only. Before submission, measurements should be verified and the coverage calculation should follow the definitions and regulations applying to the actual zone.

Maximum Garage Height

The current general garage regulations establish the following maximum heights for a detached garage:

Sloped roof: 4.60 m to the highest ridge.
Flat roof: 3.00 m.
Maximum eaves height: 3.00 m.^[3]

The elevation drawings must show:

established grade;
finished floor level;
height to the eaves;
height to the highest ridge;
roof shape and slope;
roof overhangs;
exterior finishes;
doors and windows; and
rainwater leaders and eavestroughs.

How Many Garages Are Permitted?

The general provision permits one attached garage or one detached garage per lot, subject to limited zoning exceptions.^[3]

Before proposing a detached garage, confirm whether the existing house already includes:

an attached garage;
an enclosed carport that is legally considered a garage;
another detached garage; or
a structure previously approved as a garage.

The legal status of existing structures should be resolved before a new application is submitted.

Distance Between the Garage and House

A detached garage located in the rear yard must generally remain at least 1.20 metres from the dwelling on the same lot.^[3]

Additional separation or construction measures may be required because of:

wall openings;
combustible construction;
roof overhangs;
the exposed building face;
foundation excavation;
existing house footings;
drainage between the structures; and
maintenance access.

The image’s seven-metre separation is an illustrative design choice rather than a universal minimum.

Driveway and Vehicle Access

A permit-ready site plan should explain how vehicles will reach the detached garage.

The City requires the garage site plan to identify:

driveway width;
driveway setback from adjoining property lines;
driveway surface treatment; and
the width of any walkway connected to the driveway.^[2]

The plan should also show:

the garage-door location;
the driveway route between the street and garage;
turning or manoeuvring space where relevant;
existing curb and sidewalk access;
gates or fences crossing the access route;
retaining walls;
trees and landscaping; and
any proposed driveway extension or widening.

A garage may satisfy building setbacks but still be impractical if a vehicle cannot enter it safely.

Does Driveway Work Need a Building Permit?

The City states that simply widening or resurfacing a driveway does not require a building permit. However, the work must still comply with zoning requirements and may be reviewed as part of the garage application.^[1]

Separate approval may be needed where the project affects:

the curb;
the public sidewalk;
the boulevard;
a public tree;
City infrastructure;
a utility right-of-way; or
a driveway width or location regulated by zoning.

Easements and Rights-of-Way

The City requires rights-of-way and easements to be shown on the detached-garage site plan.^[2]

An easement can contain or protect:

storm sewers;
sanitary sewers;
water services;
gas lines;
electrical services;
telecommunications infrastructure;
shared access; or
drainage facilities.

Showing an easement does not mean construction within it is permitted. The owner may need consent from the authority or utility that benefits from the easement.

Grading and Drainage

A detached garage adds a roof, foundation and hard-surfaced access area. These changes can alter the way rain and melting snow move across the property.

Mississauga requires the accessory-structure site plan to include the established-grade calculation and the points used to determine established grade.^[2]

The City also advises that the ground should slope away from buildings and neighbouring properties. Roof downspouts should extend approximately two metres away from the foundation and discharge away from neighbouring land.^[7]

A garage grading or drainage layout may show:

existing ground elevations;
proposed finished elevations;
garage slab elevation;
surface-flow arrows;
driveway slope;
roof downspouts;
swales between properties;
retaining walls;
low points and drainage outlets; and
areas where water could become trapped.

The garage and driveway should not block an existing drainage route or redirect runoff toward the house or neighbouring property.

Floor and Foundation Plans

The City requires more than a site plan. The detached-garage permit package must also include floor and foundation information.^[2]

The floor plan should identify:

garage dimensions;
door and window sizes;
room or space use;
joists, beams, posts and lintels;
structural-member sizes and spacing;
direction of span;
floor drains, where proposed;
ventilation provisions; and
section references.

The foundation plan may need to identify:

soil bearing capacity;
foundation-wall and footing sizes;
foundation materials;
stepped-footing locations;
load-bearing walls and columns;
concrete slab thickness;
granular-fill specifications; and
structural steel beams or columns.

Roof Plans and Elevations

The roof plan should show:

roof slopes;
ventilation;
rafter, joist and ceiling-joist sizes;
structural spacing;
ridge supports;
girder trusses and beams; and
direction of framing spans.

Elevations are required for every side of the garage and should identify:

grade level;
finished floor level;
height to eaves and ridge;
roof overhang;
wall cladding;
roofing materials;
doors and windows;
eavestroughs and downspouts; and
the amount of glazing on exposed building faces.^[2]

Additional Approvals That May Be Required

A building permit cannot be issued until all applicable-law requirements have been addressed.

Depending on the property, additional approval may be required from:

a conservation authority;
the City’s heritage-planning staff;
the Ontario Ministry of Transportation;
the City through site plan approval;
the Committee of Adjustment;
Forestry for tree injury or removal; or
another authority responsible for an easement or regulated area.^[4]

Trees Near the Proposed Garage

A tree permit may be required when construction will injure or remove a qualifying private tree or any City-owned tree.

The City says arborist reports are required for development and construction projects involving tree injury or removal.^[8]

The site plan should show relevant trees where:

the garage excavation enters the root zone;
the driveway will pass close to the trunk;
branches interfere with construction;
grade changes could affect the tree;
material storage could compact the root area; or
a public tree is near the construction-access route.

What Happens If the Garage Does Not Meet Zoning?

A design that does not comply with a setback, lot-coverage, height, location or driveway requirement may require a minor variance from the Committee of Adjustment.^[9]

Examples include requests for:

a smaller rear-yard setback;
a smaller side-yard setback;
greater garage coverage;
greater total lot coverage;
a taller garage;
a garage in a location not normally permitted; or
a driveway wider than the zoning maximum.

A variance is not automatic. The Committee reviews the application against the statutory minor-variance tests and considers planning impacts.

Preliminary Zoning Review

The City offers a preliminary zoning review that assesses plans before the full building-permit application is filed.

The review can examine:

the site plan;
garage floor plans;
elevations;
setbacks;
lot coverage;
height; and
grading or average-grade calculations where required.^[10]

This can be useful where the property has unusual zoning, an exception zone or a tight garage location.

How to Apply for the Building Permit

Mississauga building-permit applications are submitted online through the City’s ePlans system.^[4]

The general process is:

Confirm that the detached garage requires a permit.
Check the property zoning and exception provisions.
Prepare the site plan and construction drawings.
Identify any additional approvals.
Create an ePlans account and submit the permit request.
Pay the administration fee.
Upload the required plans and forms.
Complete the City’s pre-screen review.
Pay the remaining permit fees.
Respond to zoning, building or applicable-law comments.
Download the issued permit and approved drawings.
Begin construction and schedule the required inspections.

Starting construction before the permit is issued can lead to orders, redesign costs and delays.

Common Mississauga Detached Garage Site Plan Mistakes

Using 1.20 metres as the rear setback on every lot.
Showing 0.90 metres as the universal interior side-yard minimum.
Using one exterior side-yard setback without checking the zone.
Applying a generic 45% lot-coverage limit.
Failing to calculate the garage’s separate 10% coverage limit.
Using an unverified or outdated zoning designation.
Omitting the legal lot and plan description.
Measuring from an existing fence instead of the legal boundary.
Leaving rights-of-way or easements off the drawing.
Failing to show the existing attached garage.
Placing the garage between the house’s front wall and front lot line.
Failing to dimension the garage from the house.
Leaving the driveway width and surface off the plan.
Failing to show how vehicles reach the garage.
Omitting lot-area and coverage calculations.
Leaving grading points and drainage information off the plan.
Directing downspouts toward neighbouring property.
Failing to show trees affected by construction.
Beginning excavation before the permit is issued.

How Our Mississauga Detached Garage Site Plan Service Works

Send the property address. We review available property and mapping information.
Provide the garage dimensions. Include the proposed length, width, height and door position.
Upload available documents. A survey, title plan, contractor sketch or City comments can improve the drawing.
We prepare the site plan. The plan can show boundaries, the dwelling, proposed garage, setbacks, driveway, easements, landscaping and lot coverage.
Review the draft. Confirm the supplied dimensions before using the drawing for permit coordination.

Related SitePlans.ca guides:

Order a Mississauga Detached Garage Site Plan

Need a clear plan showing your proposed garage, property lines, setbacks, driveway access and lot coverage?

Send us the property address, proposed dimensions and any available survey, title plan, builder sketch or City comments.

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SitePlans.ca prepares residential drafting plans using customer-supplied information and available property sources. Our plans are not certified boundary surveys, structural engineering designs, grading certificates or guarantees of permit approval. A land surveyor, qualified designer, professional engineer or other licensed professional may be required.

Mississauga Detached Garage FAQs

Does a detached garage require a building permit?

Yes. The City expressly lists detached garages as projects requiring a building permit.

What is the minimum rear setback?

For a garage in the rear yard, the general minimum is 0.61 metres on a lot under 750 m² and 1.20 metres on a lot of at least 750 m². Property-specific zoning can require more.

Is the interior side-yard setback always 0.90 metres?

No. A rear-yard garage on a lot under 750 m² generally uses the 0.61-metre provision. A garage located in an interior side yard follows the applicable zone’s side-yard requirement.

What is the exterior side-yard setback?

It depends on the property’s zone. The image’s 2.40-metre figure should not be treated as a universal Mississauga requirement.

How far must the garage be from the house?

A detached garage located in the rear yard must generally be at least 1.20 metres from the dwelling on the same lot.

What is the maximum garage size?

The general maximum detached-garage floor area is 75 m², measured from the inside face of the walls.

How much of the lot can the garage cover?

The general detached-garage maximum is 10% of lot area. The entire property must also comply with the total lot-coverage limit of its zone.

Is total lot coverage always limited to 45%?

No. The maximum depends on the property’s current zoning and any exception provisions.

How high can a detached garage be?

The general maximum is 4.60 metres for a sloped roof, 3.00 metres for a flat roof and 3.00 metres to the eaves.

Can I build the garage in front of the house?

A detached garage is generally not permitted between the dwelling’s front wall and the front lot line unless a property-specific zoning provision permits otherwise.

Can I have an attached garage and a detached garage?

The general regulation permits one attached garage or one detached garage per lot, subject to limited exceptions.

Does the plan need to show the driveway?

Yes. The City requires driveway width, distance to adjoining property lines, surface treatment and attached-walkway dimensions.

Does driveway widening require a building permit?

Basic driveway widening does not normally require a building permit, but zoning and other City approvals can still apply.

Do easements need to be shown?

Yes. Rights-of-way and easements are part of the City’s site-plan requirements.

Does the plan need lot-coverage calculations?

Yes. It should show lot area, frontage, coverage in square metres and percentage, and a breakdown of the structures included.

Does the site plan need grading information?

Yes. The City’s garage submission requirements include established-grade calculations and the points used to calculate grade.

Can a fence be used as the property boundary?

Not safely without verification. A fence may not sit exactly on the legal boundary. Survey information may be needed when the garage is close to a lot line.

What happens if the garage does not meet zoning?

A minor variance from the Committee of Adjustment may be required. Approval is not guaranteed.

How are permit applications submitted?

Building-permit applications are submitted electronically through Mississauga’s ePlans portal.

Can the site plan be revised after City comments?

Yes. The drawing can be updated using zoning comments, corrected measurements, survey information or a revised garage design.

Official Sources

Mississauga’s zoning and permit requirements can change, and the consolidated Zoning By-law may not immediately reflect every Council or Ontario Land Tribunal amendment. Property-specific zoning exceptions, Greenlands setbacks, easements, conservation controls, heritage status and other applicable laws can change the result. Confirm current requirements with the City before construction.