Beauty Shot

A functional and stylish garage for any urban setting.

The Annex garage is a functional and stylish addition to our modern collection. If you are looking for a home for your vehicle, extra storage, or even an office space, the Annex garage has it all! Larger versions of the Annex can include an extra interior space in addition to a garage. This space can be used as a home studio, workshop and more.


The Annex garage works perfectly in any urban setting like a laneway or typical driveway. The recessed entry provides a covered, private area for entry as well as modern appeal.

Sample Annex gallery

Swipe or tap photos Swipe to browse photos or tap for pricing/details.

Annex specifications


  • The Annex delivers a modern solution if you are looking for a garage, storage, and extra space. Find all the details you need to know about our Annex garage in the style tabs below.

  • Modern Annex garage


  • Modern low-sloped roof.

  • Enhanced siding package.

  • A range of sizes to fit cars, boats, and all your other toys!

  • Constructed from Premium Western Red cedar.

  • Stainless steel nails!

  • Engineered beams.

  • Plenty of storage or even an extra interior space!

Popular options:

The Annex collection offers many options and upgrades that are unique to this style.

  • Maintenance free Canexel siding in a variety of vibrant colours

  • Modern Siparila wood siding in a variety of colours

  • Clear cedar T&G Siding

  • Standing seem aluminum siding to provide fire rated walls

  • Roller double garage door

  • EPDM roofing material

  • Modern vinyl sliding doors and windows

Floor plans

Below are simple floor plans for the Annex garage to get you started. Smaller versions include garage space as well as storage, while larger sizes can include an additional interior space.

  • Modern Annex garage Floor Plan 1
  • Modern Annex garage Floor Plan 2
Annex garage floor plans

Try this Floor Planner Toolto design your own custom garage space and share as you like.
You may also download graph paper and print out a few sheets to help designing your own space!

Annex Interior

Below are some Annex interiors for inspiration to help you visualize your garage. For more ideas and photo please visit our Interiors page.

  • Modern Annex Garage studio interior

    Annex Interior

  • Modern Annex Garage interior

    Annex Interior

  • Modern Annex Garage interior

    Annex Interior

  • Modern Annex Garage interior

    Annex Interior

  • Modern Annex Garage interior

    Annex Interior

Available Annex garage sizes

Annexes come in sizes ranging from 480 sq. ft. to 720 sq. ft.

If you cannot find your size please contact us.


Level of Difficulty:

The Annex garage kit is a bigger project than just a basic garden shed, but it is not overly complicated and follows the same construction technique. Like all of our buildings, the Annex includes easy-to-follow instructions, diagrams, assembly videos, as well as online and telephone support that will help you through the process.

Below is a series of photos showing one of our Annex garage kits being assembled.

Hiring a contractor

Our Annex Garages are not an overly difficult design to assemble. If you feel like you might want some assistance though, check out our hire a contractor page for useful information and advice!

Hiring a contractor Modern Annex garage
Contractor working on a garage building
  • 3D Tour of Annex Garage

    The product featured is an Annex garage in both urban driveway and laneway settings. This modern garage features crisp lines, modern windows and doors, various siding options, lots of storage space and an optional additional interior space.

    Visit our 3D Tours page to see all the Summerwood garage Styles.

  • Annex Garage design video tour

details & specs

Annex Modern Garage Dimensions

Annex Modern Garage Dimensions Annex Modern Garage Dimensions Annex Modern Garage Dimensions

Still have questions about the size of your Annex? Don’t hesitate to ask — we’re here to help!

12' 12' - 6 7/8" 11' - 0"" 4' - 2 3/8"
16' 13' - 8 3/4" 11' - 0" 5' - 4 1/4"
20' 14' - 10 5/8" 11' - 0"" 6' - 6 1/8"
24' 16' - 0 7/8" 11' - 0" 7' - 8 3/8"
28' 17' - 2 3/4" 11' - 0"" 8' - 10 1/4"

Our measurements (i.e. 12ft. x 20ft.) are taken from the outside of the floor & wall framing, therefore, they don't include the siding, and/or sheathing.

For true interior measurements, subtract the thickness of the wall framing; 3 ½” for 2x4 walls, and 5 ½” for 2x6 walls. Note: 2 x 4 is actually 1 ½” x 3 ½” and 2 x 6 is actually 1 ½” x 5 ½” due to the properties of "finished” lumber.

Wall Plan

Annex Modern Garage Wall Plan
Annex wall component

Our garage walls are assembled with 2x6 spruce wall studs for added strength and durability.

For true exterior dimensions, add the siding, sheathing (if applicable), and corner trim pieces. The Canexel siding is 3/8" thick, the cedar siding is 3/4" thick and the log siding is 1 1/2" thick. The wall sheathing varies from 7/16” to 3/4”. The corner trim is 3/4".

If you have any other questions pertaining to the size of your building, please do not hesitate to ask us, we're here to help.

Roof Framing Plan

In strong competition with hip roofing and gable roofing, are flat roofs. These roofs are common with Annex garage styles, being one of the easiest roofs to install and frame when compared to other roof styles.

Due to its geometry and low pitch, flat roofs do not always require vents. If vents are desired, they can be installed on the tallest wall or sidewalls of the building.

Consult with your contractor or roofing company, for the most effective ventilation system for your roof.

Annex Modern Garage Roof Framing Plan
Annex roof framing plan


It is important to house your Annex garage on a solid concrete foundation. A raised concrete foundation is recommended for uneven surfaces. Visit our Foundations page for more details.

Visit Foundations Page for detail.

Annex Modern Garage Foundations
Concrete pad designs for your wooden Annex garage


Summerwood prefabricated garages are engineered to last a lifetime. No cutting corners here, we use the best materials we can purchase, chosen for their aesthetic appeal, durability, and environmental acceptance. All of our buildings are designed with style and longevity in mind.

item material dimension notes
wall plates spruce 2x4 - 2x6 bottom, top, double top
wall studs spruce 2x4 - 2x6 16" on center
siding cedar channel 1x8 standard horizontal siding
material upgrades
canexel siding canexel 1x8 studs & plates
cedar wall framing cedar 2x8 - 2x6 studs & plates
esu1a osb + typar n/a wall sheathing & building wrap
wall insulation expanded polystyrene 3 1/2" & 5 1/2" within wall cavities
item material dimension notes
ceiling spruce 2x4 - 2x10 ceiling framing
rafters spruce 2x4 - 2x10 24" on center maximum
ridge board spruce 2x4 - 2x10 n/a
sheathing osb 48" x 96" x 7/16" n/a
material upgrades
cedar roof boards cedar 1x6 - 1x8 n/a
cedar rafters cedar 2x6 - 2x12 n/a
roof insulation expanded polystyrene 3 1/2" & 5 1/2" on roof surface
item material dimension notes
cedar trim cedar 1x6 - 1x8 corners, soffit, fascia
material upgrades
maintenance free trim versatex 1x4 - 1x8 corners, soffit, fascia

Popular upgrades

Enhanced Siding Package

Included with all of our prefabricated garage styles is our "enhanced siding package" – ESP. This provides great protection from the elements and ensures that your building will be code compliant. It consists of a layer of OSB sheathing and Typar or Home Slicker house wrap, providing a moisture barrier to the elements

Annex Modern Garage Popular upgrades
Enhanced siding package for a garage


Once your custom Annex garage building is completed, there are a few things you can do on the inside to add to the comfort and enjoyment of your new Annex Garage from Summerwood.
Please see Interior Finishing under Advice for more information


If you plan to heat your garage, insulation may be added either at purchase or after-the-fact if you decide to do it later. The walls and roof are constructed in such a way that adding insulation either as an option or on your own is quite simple to do.

Annex Modern Garage Insulation
Insulation material for a prefab garage


The inside of our garage styles are left exposed to easily accommodate wiring for lighting, outlets, garage door openers, car chargers, power tools, whatever you have in mind. Once the installation is complete, simply have an electrician come and do his thing.

Annex Modern Garage Electrical
Electrical configuration example


Provided you have a water source nearby, your garage pipes can be run for sinks and taps. If you have something a little more elaborate in mind like a shower or toilet, best to make sure it is coordinated with the concrete pad and installation of the garage.

Annex Modern Garage Plumbing
Bathroom configuration


Visit "options and accessories" for detail and pricing of our accessories.

Find below pricing for all of the Annex sizes that we have built so far. Don't see your size? Ask us and we will provide you with a quote.

XLG Annex
Garages ( >130 sq.ft.)

All prices in $USD
Medium Annex
Garages, price list
kit size pre-cut pre-assembled
24ft.x26ft. $50,695 $40,556 $56,795 $45,436
25ft.x25ft. $50,495 $40,396 $56,495 $45,196
24ft.x28ft. $53,795 $43,036 $60,495 $48,396
28ft.x24ft. $53,395 $42,716 $60,095 $48,076
26ft.x26ft. $53,895 $43,116 $60,595 $48,476
30ft.x24ft. $56,995 $45,596 $63,995 $51,196
20ft.x36ft. $58,395 $46,716 $65,595 $52,476
31ft.x24ft. $57,395 $45,916 $64,395 $51,516
30ft.x25ft. $69,495 $55,596 $81,795 $65,436
32ft.x24ft. $58,395 $46,716 $65,595 $52,476
30ft.x26ft. $60,795 $48,636 $68,395 $54,716
28ft.x28ft. $63,595 $50,876 $71,495 $57,196
20ft.x40ft. $64,895 $51,916 $72,895 $58,316
22ft.x45ft. $77,095 $61,676 $86,595 $69,276
29ft.x35ft. $79,095 $63,276 $88,795 $71,036
35ft.x29ft. $79,095 $63,276 $88,795 $71,036

Custom Designs

Summerwood will take your custom design and make it your own. If you have something different in mind, talk to one of our designers about bringing it to life.

let us help build your dream

Our seasoned designers would love to help you find your ideal design.
We're just a phone call away.

Contact us