A 20×30 metal building kit encloses 600 square feet, a footprint 20 feet wide and 30 feet deep. That is a true two-car garage with depth left over for a workbench, or a one-vehicle shop with a full work bay behind it. Twenty feet of width parks two cars side by side, and the 30-foot depth turns the box into a workspace.
This guide sits under the metal building sizes pillar, and it covers one footprint in depth: what fits inside a 20×30, the uses it suits, the frame and options on a quote, the clear heights you can order, and an illustrative 2026 price range. For every footprint side by side, the metal building size chart puts this size in context.
600 square feet
What a 20×30 metal building kit covers
Twenty feet wide by thirty feet deep gives you 600 square feet of enclosed floor. The width is the headline number: 20 feet is the standard two-car width, so you fit two vehicles abreast with room to open the doors. The 30-foot depth is what lifts this size above a plain two-car garage, adding a back zone for a bench, shelving, or a third small machine.
Think of it as a two-car garage that someone stretched by ten feet. Two cars take up roughly the front 20 feet, which leaves about 10 feet of clear depth across the back wall for a bench or a work area. That extra reach is why a 20×30 suits owners who want to park and tinker under one roof. If you need a third bay or a shop alongside two vehicles, step up to a wider footprint like the 20×40.
What fits
What fits inside a 20×30 building
Two vehicles, or one vehicle and a real workspace. The table below shows how a 20×30 handles the loads people most often park in this size, and where it starts to run short.
| What you want to store | How a 20×30 handles it |
|---|---|
| Two cars side by side | Fits both with door-opening room and a storage strip behind |
| One vehicle plus a shop | Car or truck up front, a full bench and tool wall across the back |
| Pickup or work truck | Parks with depth to spare for a trailer or gear behind it |
| RV or camper | A length up to roughly 28 feet ‹confirm›, if the door height clears the roof |
| Boat on a trailer | Fits with room to walk around it and reach the motor |
| Tractor and implements | Compact tractor plus a mower and attachments under one roof |
What clears and what does not. A 20×30 is a two-lane building with workshop depth.
Mind the door, not just the floor
An RV or a tall truck can fit the floor plan and still hit the door header. The roll-up opening sets your real clearance, so order the door height around the tallest thing you park. The how to choose a size guide walks through measuring before you buy.
Common uses
Common uses for a 20×30 footprint
The 600-square-foot footprint hits a popular middle: roomy enough for two vehicles or a serious shop, yet still priced for a homeowner. These are the jobs it does best:
- Two-car garage. Two daily drivers locked away, with depth left for tools, bikes, and seasonal storage.
- Home workshop or hobby shop. Woodworking, welding, or a maker space with a vehicle bay alongside. For layout ideas across sizes, see what people build.
- RV, boat, or toy storage. One large rig or several smaller toys off the weather and out of the driveway.
- Small business or trade shop. A contractor’s base for a work truck, materials, and a parts bench under cover.
- Barn, studio, or finished room. Insulate and line the interior and the 30-foot depth gives you a genuine room.
If you want covered space more than an enclosed room, the same footprint works as an open or partly enclosed cover for less. Compare it against the next size up, the 20×40, and the squarer 24×30 before you commit, since a few feet of width or depth changes what the building holds.
Frame and options
The frame, doors, and clear height
At a 20-foot width the frame can go either way: light-gauge tube steel on a budget build, or bolt-up red iron when you want a clear span and a higher load rating. Frames are sold by wall thickness in gauge, where a lower number means thicker steel; 14-gauge tube is the lighter option and 12-gauge is the stouter upgrade ‹confirm› for wind or snow country. A red iron frame also clears the floor of interior posts, which matters if you park wide loads.
Clear height is where buyers most often under-order. The eave height, the wall height at the side, sets how tall a door you can hang and how much headroom you get inside. A 20×30 is commonly offered with side walls from about 8 to 16 feet ‹confirm›. Nine feet suits cars and a workbench; go to 12 feet or more if you want a lift, a tall RV, or loft storage overhead.
On the options list you choose a roof style, the doors, and any openings. Two roll-up doors plus a walk-in door cover most two-car builds. The roof comes as standard, A-frame, or vertical-rib, with the vertical roof shedding water and snow better for a small premium. Pick the certified load rating for your county so the kit is stamped for local snow and wind, not just the base spec.
Order the size you will grow into, not the one that just fits today. A few feet of eave height or a second roll-up door costs far less now than a rebuild later.
Price
What a 20×30 metal building kit costs in 2026
As a 2026 illustration, a 20×30 steel shell kit runs roughly $8,000 to $18,000 ‹confirm› for the bare building. The spread is wide because frame type, gauge, eave height, roof style, and the certified load rating each move the number. A light 14-gauge open cover sits near the bottom; a fully enclosed, certified red iron garage with two roll-up doors and a tall eave sits near the top ‹confirm›.
That figure is the kit alone. Budget separately for a concrete slab, delivery, and any insulation or interior finish, which can add several thousand dollars ‹confirm› on top of the shell. For the full breakdown of what drives the total, see the metal building kit prices pillar.
Treat any single number with care: prices move with the steel market, your location, and the season. Get a written quote stamped for your address, confirm the frame type and the load rating, and check it against current ranges in the size chart before you sign.
FAQ
20×30 metal building kits: common questions
How many square feet is a 20×30 building?
A 20×30 building is 600 square feet, found by multiplying 20 feet of width by 30 feet of depth. That is the footprint of a deep two-car garage, which parks two vehicles side by side and still leaves about 10 feet of depth across the back for a bench or storage.
Will two cars fit in a 20×30 garage?
Yes. Twenty feet is the standard two-car width, so a 20×30 parks two vehicles side by side with room to open the doors, plus roughly 10 feet of depth left over ‹confirm› for tools and storage. It is one of the smallest footprints that holds two cars and a workspace.
How much does a 20×30 metal building cost?
As a 2026 illustration, the bare shell kit runs roughly $8,000 to $18,000 ‹confirm›, depending on frame type, gauge, eave height, doors, roof style, and the certified load rating. A slab, delivery, and insulation are extra. Always get a written quote stamped for your location.
How tall can a 20×30 building be?
Side wall, or eave, heights of about 8 to 16 feet ‹confirm› are common at this size. Nine feet suits cars and a bench; order 12 feet or taller if you want a lift, a tall RV, or overhead loft storage. The eave height sets how tall a door you can hang.
Will an RV fit in a 20×30 building?
A smaller RV or camper up to roughly 28 feet ‹confirm› fits the floor, but the roof height is the limit. Tall Class A coaches need a 14-foot or taller eave and door, so confirm the clear door opening, not just the floor length, before you order.
Does a 20×30 kit use tube steel or red iron?
Either. At a 20-foot width a budget kit can use light-gauge tube steel, while a red iron frame gives you a clear span with no center post and a higher load rating. Red iron costs more up front but keeps the full width open for wide loads and heavier snow.
Related guides
Keep reading
Comparing this footprint against its neighbors and the hubs that put it in context:
- Metal building sizes: the complete guide (the parent pillar).
- 20×20 metal building kits and 20×40 metal building kits (the sizes on either side at the same width).
- 24×30 metal building kits (a wider two-car-plus footprint if 20 feet feels tight).
- Most popular metal building sizes (where the 20×30 ranks among buyers).
- How to choose a metal building size (measure before you buy).
- Metal building size chart (every footprint and its uses in one table).
