Planning
Detached Garage Size Guide
By Chad Ruppert
How common 20x20, 22x22, and 24x24 garage sizes affect permit drawings, cost, and review requirements.
Common double garage sizes
Many detached garages are 20x20, 22x22, 24x24, or somewhere between those sizes. These layouts usually fit within the standard drawing package when the total area is 592 sq ft or less.
Size affects permit review
The municipality reviews the proposed garage footprint, height, setbacks, lot coverage, and relationship to the house and property lines.
Larger garages need earlier review
If the garage exceeds 592 sq ft, is used as a workshop, or has unusual foundation requirements, it should be reviewed before assuming standard package pricing.
How garagepermits.ca helps
Garage size affects more than parking. We translate the size you want into a permit-ready drawing package that accounts for lot coverage, setbacks, door locations, height, and whether the project still fits the standard package.
Related permit pages
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Calgary garage drawings
Local permit drawing support for Calgary detached garage applications.
Learn moreDetached garage drawing package
See what the standard $695 garage blueprint package includes.
Learn moreOversized garage drawings
Learn when larger garages and workshops need custom drawing support.
Learn moreRelated FAQ
Short answers to common garage permit questions.
Do I need a building permit for a detached garage?
Yes. In Calgary and most Alberta municipalities, a detached garage over 10 square meters requires a building permit before construction begins. The permit drawings show the garage location, size, setbacks, elevations, sections, and construction details for review.
What drawings are required for a detached garage permit?
A detached garage permit usually requires a site plan, floorplan, elevations, cross sections, and construction details. These drawings help the municipality confirm zoning, setbacks, height, lot placement, and building code compliance.
How much do standard garage permit drawings cost?
Standard garage permit drawings start at $695 for detached garages up to 592 square feet. Municipal application and building permit fees are separate and vary by city.
How fast can I get detached garage permit drawings?
Most standard detached garage drawing packages are completed in 2-3 days after the required project information is received. Custom garages, suites, workshops, and unusual sites may need a quoted timeline.
What if my garage is oversized or includes a suite?
Oversized garages, backyard suites, garage suites, and custom garage projects are quoted individually. These projects can require additional design coordination, foundation details, engineering, or deeper municipality review.
What happens if the permit reviewer asks for changes?
If the permit reviewer asks for clarification, the drawing set can be revised to respond to municipal review comments. Most comments involve setbacks, site information, construction notes, or missing details that need to be shown more clearly.
When does a detached garage need a development permit?
A development permit may be required when the garage does not meet land use bylaw rules for setbacks, height, lot coverage, placement, or other site conditions. Many standard detached garages only need a building permit, but the municipality decides based on the property and design.
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Send the basic project details and we'll help you choose the clearest path: standard package, custom quote, or suite planning. The goal is fewer permit surprises and a drawing set your municipality can review with confidence.