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Carport vs garage
The real question is not carport or garage. It is how much enclosure the way you use the space actually needs — and whether you want to be able to close it in later.
Written by Gary Thompson · Steel Building Research EditorSteel Building Research EditorReviewed by Find Steel Buildings Editorial Team
A steel carport is a roof on columns: cover from sun, rain and snow, with the sides open or partly closed. A steel garage is the same structure enclosed on all four sides, with doors, so the space inside becomes a room you control.
Between those two sit partly enclosed buildings — one, two or three sides closed — which is where a surprising number of projects actually land once the buyer thinks about wind direction, access and what they are really storing.
Schematic plan view of enclosure levels. Proportions are illustrative and are not dimensions.
Which one fits your project
A carport may fit better if
- Cover from sun, rain and snow is the actual requirement.
- You value driving in from more than one direction.
- The thing you are covering is tall or awkward to thread through a door.
- You want the option to enclose later rather than committing now.
A garage may fit better if
- Anything stays inside that you would not leave outdoors.
- You will work in the space in poor weather.
- You want the interior closed, lockable and out of view.
- You may insulate or line the interior at some point.
Ask your supplier
- What is the clear height at the door and where the vehicle parks?
- If I close one or two sides now, what changes structurally?
- Can this be enclosed later, and what should be specified now to keep that easy?
- What ventilation and condensation control do you recommend for an enclosed building here?
- Is the concrete, anchorage and site prep inside or outside this quote?
The two options at a glance
Option A
Carport (open cover)
Overhead protection with open or partly closed sides.
- Vehicles, RVs or equipment that mainly need shade and cover from rain and snow.
- You want to drive in and out from more than one direction.
- You are covering something tall where an overhead door would be the awkward part.
- The site is exposed and you would rather not enclose in stages.
Option B
Garage (fully enclosed)
A closed, lockable building you can work in and store in.
- You store tools, materials or anything you would rather keep out of sight and out of weather.
- You want to work in there in cold, wet or windy conditions.
- The space will double as a workshop, hobby space or general storage.
- You may insulate, line or condition the interior later.
Start from how you will use it
Enclosure decisions get easier when you describe the day-to-day use rather than the building. Four patterns cover most projects.
The pattern you recognise usually tells you the enclosure level, and the enclosure level tells you the building.
Parking and cover only
Vehicles come and go daily and nothing is left loose. Open cover generally does the job, and access from several sides is a real advantage.
Cover plus a bit of storage
There is a mower, some tools, a few things you would rather not have visible. This is where partial enclosure — closing the windward side and one end — earns its place.
Vehicle plus workspace
You intend to do things in there. Enclosure stops being about the vehicle and starts being about you working comfortably.
Long-term or seasonal storage
Something sits for months: a classic car, a boat, a seasonal RV. Full enclosure with ventilation planned deliberately is normally the direction.
Enclosure is a spectrum, not a switch
Almost every steel cover can be specified open, partly enclosed or fully enclosed, and the sides you choose to close are worth thinking about rather than defaulting. Closing the side that faces prevailing weather changes what the cover actually achieves far more than closing a sheltered side.
Enclosing part of a structure also changes it structurally: a closed wall picks up wind differently from an open bay, so enclosure is a design input that goes into the engineering, not a panel you tack on afterwards.
That is also why a later enclosure is worth flagging now. If you know you may close it in, the building can be specified with that in mind from the start.
Access, clearance and the thing you actually park
Open covers are forgiving on access: you can approach from an open side, park at an angle, and manoeuvre without threading a door opening. Enclosed buildings are precise: you enter through a door of a fixed width and height, and that door sets the largest thing that will ever come inside.
The clearance that matters is the height at the door and the height under the framing where the vehicle sits, not the ridge height quoted for the building. Tall vehicles — RVs, lifted trucks, a trailer with a rack — are where this goes wrong most often.
Measure the tallest and widest thing you intend to put inside, add manoeuvring room, and bring those numbers to the quote. Our dimension references exist for exactly that step.
Door width and height
For a garage, this is the real constraint, not the building width.
Clear height at the vehicle
Under the framing where it parks, not at the peak.
Turning room
Space to approach and swing in, especially with a trailer.
Weather, condensation and ventilation
An open carport ventilates itself. An enclosed steel building does not, and that is the part buyers under-plan. Once you close a building in, moisture, temperature swings and the surfaces inside interact, and ventilation and condensation control become part of the specification rather than an afterthought.
If the plan is to store something moisture-sensitive, or to enclose and later insulate, treat ventilation and condensation control as decisions to make with your supplier at design stage.
None of that argues against enclosure. It argues for enclosing deliberately.
Leaving yourself the option
The most common regret in this decision is not choosing wrong — it is not saying out loud that the use might change. Buildings outlive plans.
If you think you may enclose one or more sides, add a door, or eventually insulate, say so when you request quotes. Some of those changes are simple if anticipated and awkward if not, and it costs nothing to raise them while the building is still on paper.
Open, partly enclosed and fully enclosed
The three real options, compared on what changes for you rather than on generic feature lists.
- Consideration: Weather protection
- Open carportOverhead cover; wind-driven rain and snow can reach the sides
- Partly enclosedCover plus a shielded side, usually the weather side
- Fully enclosed garageFull protection from direct weather on all sides
- Consideration: Access
- Open carportDrive in from open sides, park at any angle
- Partly enclosedAccess from the open sides only
- Fully enclosed garageThrough the door opening you specify
- Consideration: Loose storage
- Open carportNot suited to anything you would leave out
- Partly enclosedWorkable for some items in the closed corner
- Fully enclosed garageSuited to tools, materials and general storage
- Consideration: Working in it
- Open carportFine in mild weather
- Partly enclosedBetter on the sheltered side
- Fully enclosed garageUsable in most conditions; can be lined or insulated later
- Consideration: Ventilation
- Open carportInherent
- Partly enclosedLargely inherent
- Fully enclosed garageA specification item — plan it with the supplier
- Consideration: Later change
- Open carportCan often be enclosed if anticipated at design stage
- Partly enclosedCan usually be completed to full enclosure
- Fully enclosed garageAlready the fully enclosed end of the range
- Consideration: Site footprint
- Open carportSame footprint as an enclosed building of the same size
- Partly enclosedSame footprint
- Fully enclosed garageSame footprint, plus door swing and approach room
Enclosure level is a structural input. Confirm any later enclosure plan with your supplier before the building is engineered.
What you are protecting
The item drives the enclosure level more reliably than the label carport or garage does.
- What goes inside: Daily-driven cars
- Usually needsOverhead cover; enclosure optional
- WatchApproach and turning room on a tight lot
- What goes inside: Pickup or lifted truck
- Usually needsHeight at the parking position
- WatchClear height under framing and at the door
- What goes inside: RV or motorhome
- Usually needsGenerous height and length, easy straight approach
- WatchDoor height if enclosing; total length with the tow vehicle
- What goes inside: Boat on a trailer
- Usually needsLength plus straight-in access
- WatchTongue length is part of the length you need
- What goes inside: Tractor and implements
- Usually needsHeight and an open approach
- WatchImplements raised in transport position
- What goes inside: Tools and materials
- Usually needsFull enclosure
- WatchVentilation and condensation control once closed in
Sizes vary by model and configuration. Measure the item you own rather than relying on category averages.
Bring this to your quote
Five minutes with a tape measure removes most of the guesswork from this decision.
- What goes insideEvery vehicle or item, with its height, width and length.
- Enclosure levelOpen, partly enclosed, or fully enclosed — and which sides.
- Door needsHow many openings, how wide, how tall, and on which wall.
- ApproachWhich direction you drive in from, and how much turning room exists.
- SiteSlope, surface, whether a slab exists, and where water currently runs.
- Later plansAnything you may enclose, insulate or add.
- LocationYour address, so the building is designed for your site's conditions.
What changes the number
Enclosure is the single largest variable between these two options, but it is not the only one, and the others often matter more than buyers expect.
Hold these steady across quotes and the comparison becomes real.
Enclosure level
Each side you close adds panel, framing detail and trim.
Doors
Overhead doors are a component and an opening in the structure at the same time.
Height
Extra clear height for a tall vehicle affects framing and cladding together.
Insulation and lining
Only relevant once enclosed, and always a separate scope.
Site work
Slab, anchorage, grading and access are frequently outside the building quote.
What the engineered design decides
Questions buyers ask
Often yes, and it is much simpler when the possibility was raised before the building was engineered — enclosure changes how the structure handles wind. Tell your supplier at design stage if a later enclosure is even a maybe.
Requirements vary by jurisdiction and by structure, and there is no national threshold we can quote you. Ask your local building department about your specific structure and site before ordering.
An enclosed building removes wind and direct weather, which changes how the space feels, but it is not a heated or insulated space unless it is specified that way. Insulation, lining and any heating are separate scope items.
An open cover involves less material and fewer components than the same footprint fully enclosed, but the gap depends on size, height, doors and your local market — so we point pricing questions to our cost research rather than publishing a figure here.
Next step
Tell us the footprint, the enclosure level you are leaning towards and what you are parking, and we can compare options for the building rather than for a category.
No obligation, and we do not publish prices we cannot evidence.
Where this page's statements come from
Every general statement above traces to one of these records, and each record notes what it does not authorise. Items marked not verified are stated on the page as unknown or project-dependent rather than filled in with an estimate. Our editorial standards explains the tiers.
- CG-1Tier 1HIGH
Enclosing a previously open structure changes how it must be designed for wind.
International Code Council — International Building Code, structural loads provisions — International Code Council (ICC)
Authorises the general statement that enclosure classification is a structural design input. Does not authorise any pressure figure, load value or compliance conclusion.
- CG-2Tier 1HIGH
Permit requirements for accessory structures are set locally and vary by jurisdiction.
International Code Council — code adoption and administration — International Code Council (ICC)
Authorises the statement that requirements are local. Explicitly does not authorise a size or value threshold.
- CG-3Tier 2HIGH
Enclosed metal buildings need deliberate ventilation and condensation control.
Find Steel Buildings — condensation control guide — Find Steel Buildings
Platform-published component guide. Authorises the general requirement, not a specification for any building.
- CG-4Tier 2VARIABLE
Typical widths and clearances for covered and enclosed vehicle structures.
Find Steel Buildings — carport size reference — Find Steel Buildings
Authorises pointing readers to the platform's own dimension references. Vehicle sizes remain owner-verified.
- CG-NVTier 3NOT VERIFIED
Security or insurance benefit of an enclosed structure versus an open one.
No source of adequate quality found — Find Steel Buildings
NOT_VERIFIED. No security, theft or insurance claim is made anywhere on this page.
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Related planning topics
Background reading on the questions this page raises. None of these pages sells anything.