40×20 Metal Building
Price range: $12,862.00 through $13,826.65
900 sq ft — triple wide carport for vehicles or equipment
14 Gauge
Local Certification Available
No card charged online · Specialist calls within 1 business day · 10–20% deposit by phone
40×20 Metal Building Specs, Dimensions & Custom Options
The 800 sq ft 40×20 steel building footprint gives you a wide, flexible layout for garages, carports, workshops, equipment storage, RV and boat covers, farm use, and commercial storage. Configure every spec below in our free 3D builder to match your exact use case, budget, and local building codes.
| Building Footprint | 40′ Wide × 20′ Longwith leg heights from 8′ to 20′ |
|---|---|
| Total Square Footage | 800 square feetof usable interior or covered space |
| Building Configurations | Metal carport, fully enclosed garage, metal barn, RV cover, workshop, equipment shelter, commercial buildingAll Available |
| Enclosure Options | Open carport, partially enclosed, fully enclosed with four walls, or custom sidewall and endwall configurations |
| Roof Styles | Regular Roof, A-Frame Horizontal / Boxed Eave, or Vertical Roof. Vertical Roof is recommended for snow, rain runoff, and long-term drainage performance. |
| Roof Pitch Options | Standard 3:12 pitch, with 4:12 and 5:12 pitch upgrades available for heavy snow regions or steeper residential styling |
| Frame Gauge | 14-gauge galvanized steel tubing standard, 12-gauge upgrade available for commercial, agricultural, high-wind, and heavy-use applications |
| Roof & Wall Panels | 29-gauge sheet metal standard, 26-gauge upgrade available for hail-prone, coastal, or commercial applications |
| Door Options | Roll-up garage doors from 6’x6′ up to 14’x14′, 36″ walk-in doors, framed openings, sliding doors, hydraulic doors, and rapid-entry doors for commercial use |
| Window Options | 30″x30″ standard, 36″x36″ or custom sizes, with insulated glazing and skylight options |
| Color Options | 17 colors for roof, walls, and trim independently: Barn Red, Beige, Black, Brown, Burgundy, Burnished Slate, Clay, Galvalume, Green, Patriot Red, Pewter Gray, Quaker Gray, Rawhide Tan, Royal Blue, Sandstone, Slate Blue, White |
| Wind Rating | 115 MPH standard, certified up to 170+ MPH for hurricane, coastal, and high-wind zones |
| Snow Load | 35 PSF standard, certified up to 65+ PSF for heavy snow regions |
| Certification | Available for any 40×20 configuration with engineered, stamped drawings that meet IBC, IRC, NEC, IFGC, IECC, and IMC code requirements |
| Anchoring | Concrete anchors, asphalt anchors, mobile home anchors, auger anchors, or engineered anchor layouts depending on foundation type |
| Free Delivery | Included on every orderin the 48 continental US states |
| Free Installation | Included on most tubular-frame 40×20 buildings. Custom red-iron or complex commercial builds may carry a separate install fee. |
| Lead Time | 4 to 6 weeks from order confirmation, with peak-season schedules filling faster |
| Installation Time | 1 to 2 days for most 40×20 configurations, depending on enclosure, doors, insulation, and certification |
| Warranty | 20-year rust-through warranty plus 90-day workmanship guarantee |
Limited + Product Pledge
Paint Finish
Workmanship Guarantee
Workmanship Guarantee
12 Popular 40×20 Metal Building Uses (800 Sq Ft Layouts)
An 800 square foot 40×20 prefab metal building gives you a wide, easy-access footprint for vehicle storage, open carports, fully enclosed garages, workshops, farm storage, RV covers, and business use. Filter by use case below, pick the right configuration, and customize colors, doors, leg height, gauge, enclosure, and roof style in our free 3D builder.
40×20 Metal Garage
Fully enclosed 800 sq ft steel garage for vehicles, workbenches, tools, and seasonal storage. The 40-foot width gives flexible door placement and easy access.
40×20 Workshop / Hobby Space
800 sq ft clear-span workshop for woodworking, auto restoration, welding, crafts, tool storage, and hobby work. Add insulation, windows, walk-in doors, and roll-up doors.
40×20 Metal Carport / Open Shelter
Open 40×20 steel shelter for vehicles, trailers, ATVs, lawn equipment, boats, or covered parking. Add side panels later to convert it into a partially enclosed or fully enclosed structure.
40×20 Commercial Steel Building
Use the 40×20 footprint for retail storage, office support, auto detailing, service bays, contractor storage, or business operations. Certified drawings and 12-gauge upgrades are available.
40×20 RV Cover / Boat Storage
Year-round protection for RVs, boats, trailers, jet skis, and outdoor toys. Taller leg heights and oversized doors help protect valuable recreational vehicles from weather.
40×20 Home Gym / Studio
Private 800 sq ft gym, studio, training room, music space, or creative workshop. Add insulation, windows, HVAC-ready framing, and finished interior upgrades.
40×20 Metal Barn / Farm Storage
Store tractors, hay, feed, tack, livestock supplies, tools, mowers, and ranch equipment. Optional lean-tos add extra covered space for farm and ranch use.
40×20 Man Cave / She Shed
Personal retreat, game room, music studio, art workshop, lounge, or hobby space. Fully enclosed shell can be insulated and finished for year-round comfort.
40×20 Factory / Warehouse
Compact warehouse, production space, inventory staging, equipment repair, or contractor storage. Heavy-duty 12-gauge framing and certified engineering are available.
40×20 Government / Institutional
Municipal equipment storage, field office, emergency response staging, nonprofit storage, or utility building with engineered drawings and code-ready options.
40×20 Equestrian / Tack Building
Tack room, feed storage, grooming space, compact horse shelter, or ranch utility building. Taller leg heights, ventilation, and large doors are available.
40×20 Houses of Worship
Church, mosque, temple, gurdwara, classroom, fellowship room, or community-use space with a clear-span 800 sq ft interior and customizable layout.
Not sure which 40×20 metal building configuration fits your project? Our building advisors design it free.
What’s Included in a 40×20 Metal Building Kit?
Every 40×20 prefab steel building kit ships with the structural frame, panels, trim, anchors, fasteners, and hardware needed for your configuration. Free curbside delivery is included on every order, with free professional installation on most tubular-frame buildings.
Free With Every 40×20 Metal Building Order
Everything you need ships free with no hidden fees
- 14-gauge galvanized steel frame40′ x 20′ footprint with leg height of your choice from 8′ to 20′
- Choice of 3 roof stylesRegular Roof, A-Frame Horizontal / Boxed Eave, or Vertical Roof for snow and rain runoff
- 29-gauge sheet metal panelsRoof and sides in your color choice, with 26-gauge upgrade available
- 17 color optionsPick roof, walls, and trim independently from 17 standard metal building colors
- Galvanized purlins, girts, and bracingCold-formed steel secondary framing sized for your building configuration
- All hardware includedFasteners, color-matched screws, sealing strips, brackets, bolts, and connection hardware
- Painted flashings, trim, ridge capsColor-matched to your panel choices with 20-year paint warranty
- Foundation-matched anchorsConcrete, asphalt, mobile home, auger, or engineered anchors based on install surface
- FREE delivery to all 48 statesCurbside delivery to your install address, no hidden freight charges
- FREE installation on tubular buildingsMost carports, garages, barns, and RV covers. Custom red-iron commercial builds may have install fees.
- 20-year rust-through warrantyPlus 90-day workmanship guarantee on labor and assembly
+ Popular 40×20 Building Upgrades & Add-Ons
Optional add-ons to configure your 40×20 prefab building exactly the way you want it
- Side panel enclosureConvert a 40×20 carport into a fully enclosed garage, workshop, barn, or storage building
- 12-gauge steel frame upgradeRecommended for commercial use, high-wind areas, heavy workshops, and long-term durability
- 26-gauge sheet metal upgradeThicker panels for hail-prone regions, coastal climates, and commercial durability
- Certified / engineered drawingsStamped plans, foundation drawings, wind/snow calculations, and permit-ready packages
- Higher wind and snow ratingsUp to 170+ MPH wind and 65+ PSF snow load for certified zones
- Roll-up garage doorsSizes from 6’x6′ up to 14’x14′, plus hydraulic and rapid-entry options
- Walk-in doors and framed openings36″ personnel doors, double doors, framed openings for windows, vents, or HVAC
- Windows and skylights30″x30″, 36″x36″, storefront windows, skylights, and insulated glazing options
- Insulation packagesSingle-bubble, double-bubble, fiberglass batt, spray foam, or insulated metal panels
- WainscotingTwo-tone lower wall panels for a premium residential, commercial, or agricultural look
- Lean-to additionsCovered side spaces for extra storage, equipment overhangs, stalls, or outdoor work areas
- Taller leg heightsUp to 20′ for RVs, car lifts, farm equipment, commercial vans, or overhead clearance
Customize & Build Your 40×20 Metal Building Online
Every option below is selectable in our free 3D builder or your custom quote. The 40′ x 20′ footprint stays the same. Roof style, leg height, gauge, doors, windows, color, insulation, and certification are all yours to choose.
Leg Height (8′ to 20′)
The 40×20 footprint stays fixed. Carports commonly start at 8′ to 9′. Garages often use 9′ to 12′. RV and boat covers often use 12′ to 16′. Commercial, agricultural, and lift-ready buildings can stretch up to 20′ for overhead clearance.
3 Roof Styles
Choose Regular Roof, A-Frame Horizontal / Boxed Eave, or Vertical Roof. Regular Roof is the most affordable, A-Frame Horizontal gives a classic peaked look, and Vertical Roof is recommended for snow and rain runoff.
Roof Pitch & Slope
Standard 3:12 roof pitch on most 40×20 buildings. Upgrade to 4:12 or 5:12 pitch for heavy snow regions, steeper residential styling, or improved drainage.
Frame Gauge (14 or 12)
14-gauge galvanized steel tubing comes standard, ideal for residential garages, carports, and barns. Upgrade to 12-gauge for commercial use, heavy workshops, high-wind areas, or agricultural applications.
Sheet Metal Gauge (29 or 26)
29-gauge sheet metal panels are standard for roof and walls. Upgrade to 26-gauge in hail-prone regions, coastal climates, or for added durability on commercial-facing buildings.
Certification & Engineering
Certified buildings come with stamped engineered drawings, foundation plans, and wind / snow load calculations matched to your local code. Recommended for most permitted 40×20 garages, barns, workshops, and commercial builds.
Roll-Up Garage Doors
Roll-up garage doors from 6’x6′ up to 14’x14′ are available. A 40×20 garage often uses one or two 8’x8′, 9’x8′, 10’x10′, or 12’x12′ doors depending on vehicle, workshop, or equipment access needs.
Walk-In Doors
36″ personnel doors with full frames, weatherstripping, and locksets. Place doors on front, side, or rear walls to match your workflow, storage layout, or emergency access plan.
Hydraulic & Rapid Doors
For commercial use, choose hydraulic one-piece doors, sliding doors, or high-speed rapid-roll doors. Auto-lock and remote-controlled systems are available.
Windows & Skylights
30″x30″, 36″x36″, and custom-size windows are available, with insulated glazing options. Add skylights or storefront windows for workshops, retail, home gyms, or office-style layouts.
Framed Openings
Order framed openings now for custom doors, HVAC penetrations, future windows, vents, exhaust fans, storefront entries, or future expansion plans.
Garage Door Openers & Windows
Chain-drive, belt-drive, jackshaft, or smart Wi-Fi-enabled openers are available. Window kits in roll-up doors add daylight while keeping vehicles and storage secure.
17 Standard Color Options
Choose from Barn Red, Beige, Black, Brown, Burgundy, Burnished Slate, Clay, Galvalume, Green, Patriot Red, Pewter Gray, Quaker Gray, Rawhide Tan, Royal Blue, Sandstone, Slate Blue, and White.
Mix-and-Match Roof, Walls, Trim
Pick different colors for your roof, wall panels, and trim. Popular 40×20 combinations include White walls with Black trim, Barn Red roof with White walls, or Pewter Gray walls with Black roof.
Wainscoting (Two-Tone Walls)
Add wainscoting for a premium two-tone look. Lower 3′ to 4′ of wall in a contrasting color adds curb appeal for garages, workshops, barns, and commercial-facing buildings.
Galvalume (Bare Metal Finish)
Galvalume is a hot-dipped aluminum-zinc coating with no paint. It is cost-effective, corrosion resistant, and popular for rural, agricultural, and industrial buildings.
Painted Trim & Flashings
Color-matched ridge caps, eave trim, corner trim, gable trim, and rake trim are included. Color-coded screws match your panel selection for a clean finished appearance.
Custom Color Match
Need to match an existing building, HOA color, storefront, farm building, or company branding? Custom paint matching is available for an upcharge with advisor support.
Insulation Options
Choose single-bubble, double-bubble, fiberglass batt, spray foam, or insulated metal panels. Insulation is popular for 40×20 workshops, garages, gyms, studios, and commercial spaces used year-round.
Lean-To Additions
Add a lean-to on one or more sides for extra covered storage, tractor parking, side entry protection, trailer staging, livestock shade, or outdoor work areas.
Mezzanines & Lofts
Add a mezzanine or partial loft for overhead storage, office space, inventory, or seasonal items. Taller leg heights make loft layouts more practical inside the 40×20 footprint.
Interior Partitions
Divide the 800 sq ft into bays, offices, storage rooms, restrooms, tack rooms, workshop zones, or retail inventory areas. Steel-stud partitions and insulated interior panels are available.
Trim, Anchors, Gables
Decorative trim around doors, corners, and rooflines adds curb appeal. Different trim colors and decorative gables help the building match homes, barns, or commercial sites.
Flooring Prep
We do not pour foundations, but we can guide you on slab specs. Concrete is recommended for enclosed garages, workshops, and commercial use. Gravel or compacted dirt can work for open carports and farm storage.
Wind & Snow Certification
Standard 115 MPH wind and 35 PSF snow load. Certified upgrades are available up to 170+ MPH wind and 65+ PSF snow load for hurricane, coastal, mountain, and heavy-snow regions.
Permit-Ready Drawings
Stamped engineered drawings, foundation plans, and code calculations are available. Engineering can be matched to IBC, IRC, NEC, IFGC, IECC, IMC, and local county requirements.
Door Locks & Access Control
Slide bolts, deadbolts, keypad entry, smart locks, Wi-Fi garage door openers, commercial locks, and access-control systems are available for secure storage and business use.
Fire Safety & Alarms
Smoke and heat detectors, Class ABC extinguishers, emergency exit signage, and sprinkler-system-ready framing are available for commercial or code-sensitive applications.
Anchoring System
Concrete wedge anchors for slab installs, asphalt anchors for paved surfaces, mobile-home anchors for pads, or auger ground anchors for dirt and gravel. Anchors are matched to the install surface.
Solar & Roof-Top Loads
Engineered framing can support solar panel arrays, satellite dishes, HVAC condensers, and rooftop equipment. Reinforced roof options should be specified before order if rooftop loads are planned.
40×20 Metal Building Codes, Permits & Engineering
Every 40×20 prefab steel building can be engineered, stamped, and certified to meet your local building codes. Certification is recommended for most permitted garages, barns, workshops, commercial buildings, and high-wind or snow-load zones.
We also adhere to plumbing codes, energy conservation standards, ADA requirements where applicable, and any state or local requirements. Our team helps coordinate code compliance so your 40×20 building is designed for your jurisdiction.
How to Maintain a 40×20 Metal Building
Simple seasonal upkeep keeps your 40×20 prefab steel building structurally sound, weather-tight, and looking sharp through the full 20-year rust-through warranty period.
What Can You Do with 800 Square Feet?
A 40×20 metal building gives you wide covered or enclosed space for vehicles, tools, storage, equipment, farm use, and protected daily operations
Vehicle Garage
Park vehicles, trailers, ATVs, and equipment with extra room for tools, shelves, and workbenches
Workshop Space
Use the wide layout for woodworking, welding, repairs, fabrication, hobby work, and heavy benches
Equipment Shelter
Protect machinery, mowers, tools, trailers, and valuable gear from weather and theft
Business Storage
Use the 800 sq ft footprint for inventory, packing, service work, shelving, and workflow management
Roll-Up Door Access
Add roll-up doors for vehicles, equipment, trailers, and easy loading access
Gym or Studio
Create a private gym, studio, game room, creative shop, or multipurpose recreation space
Farm & Ranch Use
Shelter feed, tack, implements, small tractors, livestock supplies, trailers, and ranch equipment
RV & Boat Storage
Use taller leg heights and wide access for boats, trailers, compact RVs, and outdoor toys
3 Ways to Order Your 40×20 Metal Building
Customize your 40×20 steel building in our free 3D builder, request a free custom quote, or talk directly with a building expert. Reservation deposits stay flexible, and final balance is due only after installation is complete.
Request Free 40×20 Quote
Free custom design, reply within 24 hours
Tell us your requirements and our 40×20 building advisors will design and price your custom steel building for free. Best path if you need certified drawings, permit help, enclosure guidance, or a unique commercial layout.
- Free expert design consultation
- Permit and certification handled for you
- Custom layout and engineered drawings
- Quote delivered within 1 business day
Free quote. Flexible deposit to reserve after approval.
Build Your 40×20 in 3D
Design your 40×20 yourself, see live pricing
Use our interactive 3D metal building builder to customize every detail of your 40×20 build. Pick configuration, height, doors, windows, colors, gauge, roof style, enclosure, and certification.
- Visual 3D customization tool
- Live pricing as you customize
- Reserve your build with flexible deposit
- Balance due only after installation
Free tool. Flexible deposit to reserve your build.
Talk to a 40×20 Building Expert
Fastest answers, call or chat now
Speak directly with a building advisor who specializes in 40×20 metal buildings. Get pricing, permit guidance, configuration help, and customization advice in minutes.
- Instant answers over the phone
- Expert advice on permits, codes, and sizing
- Walk-through of customization options
- Mon to Fri 8am to 6pm PST, Sat 9am to 3pm
Toll-free. Speak with an expert now.
How the 3D Builder Works
Design your ideal 40×20 metal building in minutes
1. Launch Builder
Open the builder in a new tab so you can keep this page available while designing.
2. Configure Your Building
Set size, roof style, certification, colors, doors, side panels, and other custom options.
3. Save Your Design
Copy your configuration code or summary before returning to this product page.
4. Complete Your Request
Send us your final configuration and we will confirm pricing, scheduling, and installation details.
Ready to design your custom 40×20 metal building?
Tip:Keep this page open so you can return and submit your final configuration with ease.
How Much Does a 40×20 Metal Building Cost?
No hidden fees on any 40×20 prefab steel building. A 40×20 metal carport starts around $5,495, an enclosed garage from $8,995, a metal barn from $7,500, an RV or boat cover from $5,995, and a commercial certified build from $11,500. Final pricing depends on roof style, gauge, enclosure, doors, certification, and installation state.
Building Configuration
A 40×20 open carport is the lowest-cost entry point. Enclosing it as a garage adds wall panels and doors. Commercial certified builds add stronger framing, engineering, and permit-ready documentation.
Your Location
Delivery distance, local labor rates, wind exposure, snow load, and state-specific certification requirements affect the final 40×20 price.
Steel Gauge
14-gauge galvanized tubing comes standard. 12-gauge upgrade adds strength and is recommended for commercial buildings, high-wind regions, equestrian use, or heavy workshops.
Roof Style & Pitch
Regular Roof is the most affordable. A-Frame Horizontal adds curb appeal. Vertical Roof costs more but is recommended for rain, snow, and long-term roof performance.
Certification
Certified buildings with engineered, stamped drawings cost more but may be required for permits, commercial use, coastal zones, hurricane regions, and heavy-snow areas.
Doors, Windows, Insulation
Roll-up doors, walk-in doors, windows, insulation, skylights, framed openings, and smart openers add to the final price. Door quantity and size are major pricing variables.
40×20 Metal Building Complete Price Range
Range covers an open 40×20 carport at the low end through a fully loaded commercial certified building with 12-gauge upgrade, insulation, multiple doors, windows, and engineered drawings at the high end.
Flexible Financing & Rent-To-Own
Choose the payment path that fits your project and budget
Traditional Financing
Credit Check Required
- Finance your metal building project
- Structured monthly payment options
- Terms based on lender approval
- Fast online application process
- Ownership from day one
Rent-To-Own (RTO)
No Credit Check
- No credit check required
- Simple approval process
- Low upfront commitment
- Convenient monthly payments
- Great for many standard metal structures
How Delivery & Installation Works
A simple step-by-step process for getting your 40×20 metal building installed
Place Your Order
Submit your request for the 40×20 configuration and confirm colors, doors, certification, foundation, and site details.
Step 1
Production Scheduling
Your order is scheduled according to manufacturing capacity and your configured metal building requirements.
Step 2
Prepare the Site
Make sure your jobsite is level and accessible before the install team arrives. Foundation, lift requirements, and electricity availability should be reviewed in advance.
Step 3
Installation Day
Our crew installs the 40×20 metal building and verifies final layout, anchoring, door placement, and exterior finish details.
Step 4
40×20 Metal Building Reviews from Verified Buyers
Customers across 48 states trust Steel And Stud for their 40×20 metal carports, garages, barns, RV covers, workshops, and commercial steel building projects. Read a few owner stories below.
“Ordered a 40×20 fully enclosed garage with two roll-up doors and the 12-gauge upgrade. The wide layout gave us room for vehicles, tools, and a dedicated work area.”
“Bought a 40×20 metal barn for hay, feed, tools, and tractor storage. The vertical roof and lean-to option made it a practical fit for our farm.”
“We use our 40×20 as a contractor storage building. It holds materials, tools, trailers, and equipment with room left for shelving and staging.”
Compare 40×20 vs. Other Metal Building Sizes
Need a different size? Compare prices and customize any of these prefab steel building sizes in our free 3D builder. Every order ships free to 48 states and includes professional installation on most tubular-frame buildings.
| Feature | 30×20 Building | 40×20 Building | 20×40 Building | 40×30 Building |
|---|---|---|---|---|
| Square Footage | 600 SF | 800 SF | 800 SF | 1,200 SF |
| Use Capacity | Compact garage or storage | Wide garage + storage flexibility | Deep garage or workshop | Larger shop or garage |
| Access Potential | Very Good | Excellent | Excellent | Maximum |
| Roof Style | Customizable | Vertical Recommended | Vertical Recommended | Vertical Recommended |
| Best For | Small storage | Vehicles, workshop, barn, storage | Garage or equipment storage | Large workshop or storage |
| View 30×20 | You’re Here | View 20×40 | View 40×30 |
40×20 Metal Building FAQ: Cost, Permits, Sizes & Install
Everything you need to know before ordering your custom 800 sq ft prefab steel building. Get answers on pricing, configurations, leg heights, roof styles, colors, foundation prep, certification, and code compliance.
Request Your Custom Design & Quote
Tell us about your project and we’ll provide a custom design with exact pricing. No obligation, no pressure just helpful information to guide your decision.
