Mansard – 20′ x 20′ Detached Two-Car Garage


(1 customer review)

The Mansard – A traditional utilitarian design, this 20′ wide x 20′ deep traditional style two-car garage features a 21″ overhangs, rough stucco siding beneath a mansard roof and 348 square feet of finished interior floor space.


20′ x 20′ Mansard Style Detached Two-Car Garage Blueprints

3D perspective of Mansard style two-car garage blueprints

This 20′ x 20′ Mansard style detached two-car garage blueprint package is a contemporary styled and very popular garage plan.

Featuring a rough finished stucco cladding, 21″ deep overhangs, large casement windows and a 16′ wide x 7′ tall overhead door, these two-car garage plans make for easy permitting in places like Vancouver & Calgary.

Quick Facts:

20′ x 20′ Mansard Style Detached Two-Car Garage Blueprints

  • 20′-0″ wide x 20′ deep
  • Mansard style roof with 21″ overhangs
  • Classic style elements
  • Single overhead garage door
  • 400 sf footprint
  • 345 sf interior floor space
  • 9′ tall ceilings
  • Rough finished stucco cladding
  • Two parking stalls
  • Crawlspace ceiling storage

The Exterior:

20′ x 20′ Mansard Style Detached Two-Car Garage Blueprints

The Mansard 20' x 20' detached t car garage

20′ x 20′ Mansard style detached two-car garage blueprint package is a classically styled example of form follows function.

With the roof form driving the name, the same is true for it’s architectural design as the roof brings together a 12:12 sloped roof with a small flat portion on top that allows for the look of a heavy sloped roof garage with the benefits of reduced building height.

This unique roof structure offers an opportunity for storage in a small attic style storage area above the garage parking; depending on your municipality.

Measuring 20′ wide x 20′ deep, this generically styled garage features a 400 sf footprint and approximately 345 sf of finished interior space. The 21″ roof overhangs provide valuable protection from the elements while a central roof drain scoops away water into your two pipe drainage system or rock pit.

The Mansard 20' x 20' detached t car garage

Perforated aluminum soffits help keep the cost down while wall mounted compact fluorescent lights are used rather than recessed soffit lighting. Several casement windows provide plenty of natural light to the interior while the rough finish stucco cladding with a complete rain screen provides a durable and aesthetically pleasing finish you can rely on.

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The Interior:

20′ x 20′ Mansard Style Detached Two-Car Garage Blueprints

The Mansard 20' x 20' detached t car garage

On the interior, you have a painted drywall finish with two parking stalls; each 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 16′ wide by 7′ tall rolling overhead garage door.

The Mansard – 20′ x 20′ detached two-Car garage 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 making a workbench fit in nicely beneath.

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

The Mansard 20' x 20' detached t car garage

Plan Package Includes:

  • Garage floor plan
  • Two garage sections
  • Garage roof plan
  • Exterior elevations
  • 3D interior & exterior perspectives
  • Wall Legend
  • Construction Assemblies
  • Door & window schedules
  • General specifications
  • Project Data
  • Project Scope
  • Drawing Legend
  • Homeowner instruction guide

For a Limited Time Only:

  • Garage electrical layout
  • Garage reflected ceiling plan
  • Foundation plan
  • Footing & soffit details

Additional Add-on’s:

permit ready garage plans

Digital PDF File

Adaptive House plans additional blueprint sets

Additional Blueprint Sets

permit ready garage plans available in original Autodesk .DWG CAD file format

CAD Design File

Take a Virtual Tour:

20′ x 20′ Mansard Style Detached Two-Car Garage Blueprints

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Additional information


Adaptive Plans Inc.

Product Line

Parking Stalls

2 Stalls


20 Feet


20 Feet


400 sf

Square Footage

348 sf

Interior Ceiling Height

9 Feet

Vaulted Ceilings


Garage Door Width

16 Feet

Garage Door Height

7 Feet



Climatic Zone

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

Cladding Type

Acrylic Stucco Siding

Roof Style

Mansard Roof

Roof Slope

12:12 Slope, No Slope

Roof Structure

Stick Frame Rafters

Roofing Material

Ashphalt Shingle Roofing, Synthetic Torch-on Roof Membrane

Roof Overhang

21 Inches

Number of Windows

2 Windows



Covered Entry




Construction Details

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

Structural Engineering Included



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

Pottery Studio


Scratch Set



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1 review for Mansard – 20′ x 20′ Detached Two-Car Garage

  1. Tammy

    I wanted extra storage space so I picked this one. It was hard to get it passed at city hall with the extra space, I wasn’t expecting it to be so hard. It’s done now they accepted it, but not without a lot of work on my husbands side.

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