Lean-ToAttached Slope
12' x 20' x 9'
- 14-Gauge frame
- Concrete anchors
- Side-wall coverage
Planning Price
$4,687
Lead Time
3–7 weeks
Flexible Single-Slope Coverage
Lean-To Metal Structures
Add practical single-slope coverage with a custom standalone, adjacent, or metal-building-attached lean-to designed for vehicles, equipment, workspace, and property functionality.
Standalone or Metal-Building Attached
RV & Equipment Coverage
Vertical Roof Options
Additional Covered Workspace
Manufacturer Delivery & Install
Featured Products
Featured Lean-To Metal Structures
Compare popular configurations from this product family, review their saved specifications, and request pricing for the closest match or a custom variation.
Lean-ToAttached Slope
12' x 25' x 12'
- 14-Gauge frame
- Concrete anchors
- Open access
Planning Price
$4,937
Lead Time
3–8 weeks
Single-Slope Coverage
A single-slope roof that adds covered space on its own or off a compatible reviewed metal building.
Flexible Covered Space
Lean-to structures add practical single-slope coverage where you need it — standalone, alongside, or attached to a compatible metal building. Not available for houses or conventional buildings.
Standalone
A single-slope shelter that stands on its own.
Metal-Building Attached
Adds side coverage to a compatible reviewed steel building.
Vertical Roof
Ridge-to-eave panels for runoff on longer lean-tos.
Sizing
What Size do You Need
Lean-to sizing depends on the coverage you need and any structure it attaches to. Use the matrix as a starting point.
Width Selection Matrix
Sizing based on standard vehicle footprints
| Width | Best Use Case | Capacity |
|---|---|---|
12' Wide | Single Car, Truck, or SUV | 1 Vehicle |
18' Wide | Two Compact Cars or One Large RV | 1-2 Vehicles |
20' Wide | Two Mid-Size Sedans | 2 Vehicles |
22' Wide | Two Full-Size Cars | 2 Vehicles |
24' Wide | Two Full-Size Trucks, SUVs, or Vans | 2 Vehicles |
26' Wide | Three Compact/Mid-Size Cars | 3 Vehicles |
28' Wide | Three Mid-Size Cars | 3 Vehicles |
30' Wide | Three Full-Size Cars, Trucks, or SUVs | 3 Vehicles |
Pro Tip: Door Swing Clearance
While these dimensions list vehicle capacity, we always recommend measuring your vehicle with the doors open. A 12' wide unit is a tight fit for a full-size truck with extended mirrors.
Configure It
Attachment Options
A lean-to can stand alone or connect to a compatible steel building — never to a house.
Standalone
An independent single-slope shelter sized for your site.
Adjacent
Sits beside another building without structural attachment.
Metal-Building Attached
Connects to a compatible reviewed steel building for added coverage.
Use Cases
Common Applications
Extra covered space wherever a full building isn't needed.
Vehicle Coverage
Side coverage for a car, truck, or extra parking.
RV & Equipment
Covered space for RVs, trailers, and equipment.
Ag & Storage
Firewood, feed, implements, and rural storage.
Workspace
Covered work area added to an existing steel building.
Real Pricing
Pricing & What Drives It
Live starting prices from recent lean-to builds. Your final price depends on size, height, and attachment — get an instant estimate.
12' x 25' x 12'
12 x 25 x 12/9 Tall Lean-To Addition
Starting at$4,937
12' x 20' x 9'
12 x 20 x 9/6 Lean-To Metal Structure
Starting at$4,687
What drives the price
- Size — width, length, and leg height
- Frame gauge — 14-gauge vs heavier 12-gauge
- Roof style — standard vs premium upgrades
- Site — anchors, slab, and snow/wind rating
Get an Instant Estimate
Estimates only — contact us for an official quote
Installed Projects
Real Lean-To Builds
Compare representative single-slope lean-to configurations and attachment layouts.
Built to Code
Engineering & Permits
Attachment and load transfer are engineered around the site and any host structure.
Load Transfer
Attachment points engineered for wind and snow pressure.
Wind & Snow
Configurations for valley wind and foothill snow exposure.
Certified Anchoring
Concrete, asphalt, or ground anchors rated for local uplift.
Engineered Plans
Stamped drawings and calculations available for permits.
Lean-To Questions Answered
How much does a lean-to cost?
Lean-to structures start around $5,400 and scale with size, height, and whether they're standalone or attached. Use the calculator for an instant estimate, then we confirm an official quote.
Can a lean-to attach to my house?
No — lean-tos attach only to a compatible, reviewed metal building, or stand alone. They cannot be attached to houses or conventional wood-frame buildings.
What are lean-tos used for?
Extra single-slope coverage: RVs and equipment, covered workspace, firewood or feed storage, and side coverage added to an existing steel building.
Do you pour concrete or do foundation work?
No — Norcal Carports does not perform concrete or any foundation work. We provide site-appropriate anchoring but do not install foundations. See our foundation requirements guide to prep your site.
Request A Metal Building Quote
Need pricing for a carport, RV cover, garage, lean-to structure, or wide-span building? Send the size, installation ZIP code, surface, and site conditions. Most quote requests receive a response the same day or by the next business day.
Structure Sizing
Engineering
Snow Loads
Clearance