Greenbriar 12x20 Wood Garage Shed Kit - ALL Pre-Cut (greenbriar_1220)


The Greenbriar prep for vinyl garage kit is the perfect single car garage. With its high headroom and the ability to extend building depth you will have plenty of room for your vehicle and storage or work area.

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Prep for vinyl means that the Greenbriar exterior walls are covered with an OSB ( Oriented Strand Board ) for the purpose of applying exterior siding or your choice. You may apply wood lap siding, stucco, Vinyl siding or any exterior grade siding designed to be applied to an underlay. This allows you to match the existing siding of your home. Sold in home centers in the US and Japan Best Barns has been producing quality building kits for 30 years. Best Barns passes on additional savings to you because they work with a local home center nearest you providing material to finish your new storage shed for professional results. 


OSB Exterior Sheathing:
  • 7/16" OSB(Oriented Strand Board) to allow for the application of exterior siding
Sturdy-Built Truss System:
  • Includes Hurricane Hangers for a wind load of 120 mph
High Side Walls:
  • 7'-5" side wall height
  • 24" o.c. wall studs
Gable Overhang:
  • Gable overhang to protect against the elements
Once you receive your new building begin by unpacking the pre-cut framing, doors and hardware. You will also receive a detailed manual with step by step instructions. Each step is explained with clear instructions and detailed line art and has been developed with the novice builder in mind.
Best Barns wood shed kit components fit easily into place with no special tools or skills required!

Wood Shed Kit Assembly

  • Pre-cut roof trusses for fast and accurate assembly
  • Pre-cut Wood Gussets
  • Pre-cut wall framing
  • Pre-cut L.P. Smartpanel primed siding
  • Pre-cut roof sheathing
  • Pre-cut trim for a perfect fit
  • Technical Support - 7 days
  • Satisfaction Guaranteed
All required hardware including door hinges, latch, nails, hurricane hangers, glue for gussets and detailed instruction manual. Shingles, roof edge, garage door and vinyl siding provided by owner.
Order with confidence. We take great pride in our wood shed kits. Product quality and satisfaction is out number one goal. We use the highest grade of lumber from Sweden and Germany. These countries require a more stringent grading system than US standards insuring only the best lumber is used in your shed kit.


Vinyl siding purchased by owner.
Exterior walls are prepped with OSB (oriented strand board) for application of vinyl siding of your choice. Owner buys vinyl siding locally.

Shed Siding Example

Vinyl siding offers the shed owner a lasting durable finish to compliment their home.

Vinyl Siding

Shed Kit Vinyl Siding Material List


Shed Kit Elevation


Optional Item
Optional single hung windows with screens & decorative raised panel shutters.
Single hung windows 18" x 36" aluminum windows provide light and ventilation. Lockable frames are durable and easy to operate. Screens limit birds and insects. Decorative raised panel shutters are included.

Shed Kit Single Hung Window

Decorative octagonal gable windows illuminate interiors, beautify exteriors.

Shed Kit Gable Window


Our trusses are engineered to handle severe snow load of 40 psf (pounds per square foot) and 120 mph wind loads. For extra strength metal hurricane truss hangers are supplied to secure trusses to the exterior walls.

Hurricane hanger detail

* Stamped engineered drawing available upon request.


Garage door is purchased locally by homeowner
Door opening is for an 8' Wide x 7' High garage door. If purchasing a rollup door you will need a 9" low headroom kit for the track system.
An optional walk-in entry door gives better access:
  • Pre-hung 9-lite walk-in door includes aluminum threshold and lockset
  • Windowless pre-hung 6-panel steel walk-in dooralso includes threshold and lockset
Optional Item
Shed Kit 9 Lite WalkIn Door


Optional Item
Choose an optional Sturdy-Built wood floor for your new garage kit. Easy to construct and designed specifically for your building.
This floor is designed for buildings incorporating an overhead garage door. A galvanized sill plate is provided with this floor system.
The Sturdy-Build floor system comes standard with 3/4" plywood flooring and 2x4 treated floor joists spaced 12" o.c.. Floor is supported with 4x4 treated runners.
Nails are included. Material is not pre-cut. Floor sheathing is not treated. The floor package will be delivered, prior to your shed, by a local lumber supplier. They will call to make delivery arrangements. Someone will need to receive/sign for delivery.

Shed Kit Wood Floor System

Optional Pre-cut Treated Wood Ramp
Choose an optional pre-cut treated wood ramp system to match your building. This option is designed so that when you purchase our Wood Floor you can correctly match the height of the wood floor.

Shed Kit Wood Ramp


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Greenbriar 12x20 Wood Garage Shed Kit - ALL Pre-Cut (greenbriar_1220)

Greenbriar 12x20 Wood Garage Shed Kit - ALL Pre-Cut (greenbriar_1220)

The Greenbriar prep for vinyl garage kit is the perfect single car garage. With its high headroom and the ability to extend building depth you will have plenty of room for your vehicle and storage or work area.

Write a review


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