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CUBE – 30′ x 20′ Detached Three-Car Garage


The CUBE – A fully insulated 30’x20′ modern-style three-car garage featuring vertical metal siding, modern windows & doors and glass overhead doors. With 535 square feet of interior floor space, there’s plenty of room for storage and three vehicles.


CUBE – 30′ x 20′ Detached Three-Car Garage

CUBE – 30′ x 20′ Detached Three-Car Garage

Driveway approach

The Cube 30′ x 20′ detached three-car garage is one of many garage plans with a flat roof in our CUBE Collection. It features vertical metal siding, several modern clerestory windows along the side & back and a single entrance.

With 535 SF of insulated interior floor space, this 30′ wide x 20′ deep detached garage plan is ready to be used however you see fit!

Quick Facts

CUBE – 30′ x 20′ Detached Three-Car Garage

The Exterior:

CUBE – 30′ x 20′ Detached Three-Car Garage
Garage Plan with a Flat Roof | Cube Three-Car Garage Plan
Garage Plan with a Flat Roof | Cube Three-Car Garage Plan

Designed as part of our 30′ x 20′ garage series, The Cube garage plan with a flat roof is a modernists delight, pulling from the simplistic forms of modern architecture.

Wrapped in a vertical corrugated metal siding & free of any roof overhangs, The Cube detached three-car garage gives off a modern, industrial feel.

The fully glazed, dual storefront-style overhead garage doors allow plenty of light inside. The commercial-style, wall-mounted halogen lights offer ample nighttime light onto the driveway and entrance doors.

The commercial-style steel entrance door looks right at home, and large window wall-style windows allow ample light into the space.

If you’re looking for a similar flat roof garage with a more contemporary style, check out the Modernist three-car garage, it’s another top-rated garage plan. 

The Interior:

CUBE – 30′ x 20′ Detached Three-Car Garage

On the interior, you have a painted drywall finish with two parking stalls; each is measuring 18′-8″ deep x 9′-4″ wide.

Access to the garage comes from a dedicated garage entrance off a 36″ wide side entrance door or through the dual 8′ wide by 7′ tall rolling overhead garage doors.

This garage plan with a flat roof has a finished floor-to-ceiling height of 9′-0″, thus leaving some room to amend the plans to an 8′ tall overhead door if you so choose.

Windows are placed at 42″ above the concrete floor; therefore, a workbench or freezer can be made to fit in nicely beneath.

Ceiling-mounted compact fluorescent lights are typical inside, with several wall receptacles specified off of a 60 AMP electrical sub-panel.

Garage Plan with a Flat Roof | Cube Three-Car Garage Plan
Garage Plan with a Flat Roof | Cube Three-Car Garage Plan

Have You Seen These Plans?

This Plan Package Includes:

CUBE – 30′ x 20′ Detached Three-Car Garage

Take a Video Tour:

CUBE – 30′ x 20′ Detached Three-Car Garage
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100% Satisfaction Guarantee!

Adaptive House Plans will happily exchange your first order for another blueprint or house plan package of equal or lesser value within 30 days of your original date of purchase.

100% satisfaction guarantee

CUBE – 30′ x 20′ Detached Three-Car Garage

Would you like to learn more?

Our customer support team would be happy to assist you in finding that perfect plan or customizing one tailored just to you! 

Select the “Add to Quote” button below to customize your plan. We require limited information and will get back to you right away.

(1 customer review)


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Adaptive Plans Inc.

Product Line

Parking Stalls

3 Stalls


30'-0" (9.14m)


20'-0" (6.10m)

Building height

Under 3.6m (13.71ft), Under 4m (13.12ft), Under 5m (16.40ft), Under 6m (19.68ft), Under 7m (22.97ft), Under 8m (26.25ft), Under 9m (29.52ft)


600 sf

Square Footage

535 sf

Interior Ceiling Height

9 Feet

Vaulted Ceilings


Garage Door Width

3 x 8 Feet

Garage Door Height

7 Feet



Climatic Zone

BC – Zone 4, BC – Zone 5 to 7a, BC – Zone 7b & 8

Cladding Type

Vertical Metal Siding

Roof Style

Flat Roof

Roof Slope


Roof Structure

Engineered Trusses

Roofing Material

Synthetic Torch-on Roof Membrane

Roof Overhang

No Overhang

Number of Windows

2 Windows



Covered Entry




Construction Details

Electrical Plan, Footing Detail, Foundation Plan, Reflected Ceiling Plan

Structural Engineering Included



24"x36" Architectural Bond Paper, CAD File, PDF File

Virtual Reality Tour

Scratch Set



30-day Satisfaction Guarantee

1 review for CUBE – 30′ x 20′ Detached Three-Car Garage

  1. Rohan S.

    We we’re really pleased with the quality of the drawings but the customization’s we made really hit the mark. The value engineering suggestions given by our designer were really great and the entire process left my wife and I very impressed. Highly recommend the folks at Adaptivehouseplans.com.

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