Interior Storm Windows for Commercial Buildings in Canada

Custom interior window inserts help commercial buildings improve comfort, reduce drafts and outside noise, and preserve existing windows with minimal disruption.

Explore the interior storm windows product.

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See How It Works

Understand the retrofit

What are interior storm windows?

An interior storm window—also called a storm-window insert or retrofit secondary glazing—is a separate glazing panel fitted on the room side of an existing window.

It adds another layer and a sealed air space without removing the primary window. The result is a practical upgrade for comfort, drafts, outside noise and heritage-sensitive properties. Visit our Window Inserts page to see the broader product range.

Review The Opening

Check frame condition, clearances and operation.

Fit From Inside

Install with minimal disruption.

Remove When Needed

Support cleaning and seasonal access.

Custom Fabricate

Match the insert to the measured opening.

Choose the right approach

Interior inserts vs. other window solutions

Approach	What Changes	When It May Fit	Important Consideration
Magnetite interior insert	Adds a custom secondary glazing layer inside the existing opening.	Comfort, outside noise, heritage or phased retrofit projects.	Requires accurate measurement and a compatible opening.
Full replacement	Removes and replaces the primary window, often including the frame.	Damaged or failing windows, renovation or redesign projects.	Usually involves more construction and disruption.
Standard exterior storm window	Mounts a storm panel outside the primary window.	Some exterior applications with suitable access.	May affect exterior appearance and maintenance.

Magnetite is a custom interior secondary-glazing system measured to the existing opening. Standard exterior storm windows are typically mounted outside the primary window and may have different fit, appearance, access and maintenance requirements.

Designed around your opening

Details that shape the recommendation

Compatibility and measurement

Window type, reveal depth, frame condition, clearances and hardware are reviewed before a solution is confirmed.

Air gap and comfort

Air-space geometry, seals and the primary window influence thermal comfort and condensation behavior. See energy efficiency options.

Appearance and removability

Interior inserts keep the exterior elevation unchanged and can be removable, subject to configuration.

Noise reduction

Secondary glazing can help reduce transmitted sound; results vary by assembly and sound source. See soundproof inserts.

Pricing and warranty

Size, quantity, glazing, access, delivery, installation and warranty terms affect the estimate.

Supported applications

Explore residential, commercial, and heritage projects.

PERFORMANCE NOTE

Noise-reduction results vary by window assembly and installation conditions.

Noise reduction varies by building, existing window, glazing, air gap, seals, installation conditions and sound source. Customer feedback reflects individual experiences and does not represent a guaranteed performance level.

Thermal comfort

Helps reduce drafts and heat transfer through the window assembly.

Noise reduction

A sealed secondary layer can help reduce transmitted outside sound.

Condensation considerations

Results depend on humidity, ventilation, temperature and window condition.

Appearance and removability

Preserves the exterior and supports access for cleaning or seasonal needs.

Residential

Homes, condos and older windows.

Commercial

Offices, hospitality and mixed-use buildings.

Historical

Original windows and sensitive exteriors.

Evidence before promises

Built around tested performance and a clear scope.

Magnetite inserts are custom-measured and professionally installed for the existing opening. Performance depends on the window assembly, glazing, air gap and installation conditions.

Custom fit

Measured for the actual opening, frame and available clearance.

Professional Install

Installation details are selected for the property and operating needs.

Warranty

Warranty coverage varies by product, installation, and project requirements.

Pricing depends on: window count and size, shape, material, mounting system, access, installation and project requirements.

Get Project Pricing

Testimonials

What Our Customers Are Saying

    
 
 
       Posted on Google  
   
   Jinjin Liu 
 
 
 
 Trustindex verifies that the original source of the review is Google. after inside window installed, It’s much much better than before. It blocks noise at least 80%, I don’t hear anything from outside almost.

Really appreciate you and your company solving my pain point.
  
 
      Posted on Google  
   
   Steve Campbell 
 
 
 
 Trustindex verifies that the original source of the review is Google. What a wonderful administrative team in Ontario and installation team in BC.  Professional, responsive and...real people.  The magnetite inserts themselves are a fantastic solution for our needs.  Excellent sound and thermal protection.
  
 
      Posted on Google  
   
   Steve Cole 
 
 
 
 Trustindex verifies that the original source of the review is Google. I work from home and couldn't stand the sound of passing traffic and screaming kids on my street. I got Magnetite windows installed and it cut the noise right down. Of course nothing is 100%, but Magnetite windows made a massive difference. And they cost me next to nothing compared to what brand new soundproof windows would've costed. Alfredo and his team are pros. Highly recommended if you want a more peaceful home for a very reasonable price.
  
 
      Posted on Google  
   
   Patrick Duncan 
 
 
 
 Trustindex verifies that the original source of the review is Google. Solid 4.5, thank you to Alfredo and Jaskaran for the setup and installation! There is definitely a noticeable decrease in traffic noise, so it does work. I subtracted 0.5 since there are slight scuffs and marks on new frame, but that’s me being a perfectionist.
  
 
      Posted on Google  
   
   Steffen S 
 
 
 
 Trustindex verifies that the original source of the review is Google. Works better than expected, it is indeed sound proofing
  
 
      Posted on Google  
   
   Terry He (何天宇) 
 
 
 
 Trustindex verifies that the original source of the review is Google. Martin and Rashad did an excellent job installing a custom-fit entire floor-to-ceiling wall of Magnetite window inserts for my guest bedroom in my condo. We were having a common issue of some construction noise in a busy Toronto location. The bedroom has been quiet and serene ever since the installation. For the amount of glass, customized fabrication, and professionalism/friendliness from Martin, I think the price was worth it for our result. I highly recommend Martin and would definitely work with him again. Thank you guys!
  
 
      Posted on Google  
   
   Larissa Katz 
 
 
 
 Trustindex verifies that the original source of the review is Google. I was so extremely happy to have found a solution for soundproofing our windows. The level of service provided by Magnetite Canada was exceptional. I had a very tight deadline for the production and installation of the panels, and all my requests were accommodated and treated with utmost care. I am forever grateful for Alfredo for speeding up the production, and for Martin for his excellent and efficient work on the installation. This company is not only professional, but they also treat you with care and attention.
  
 
      Posted on Google  
   
   Teresa Bernaudo 
 
 
 
 Trustindex verifies that the original source of the review is Google. Martin and Rashad did a great job, measuring and installing, the head office staff were very professional in coordinating the work and we are very happy with the noise reduction results! Highly recommended!! Thank you Magnetite!!!