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Replacement · Storm

Montreal storm window replacement for heritage homes

Love your original windows but tired of the draft? A storm window adds a second pane and an insulating air gap in front of or behind the existing sash — cutting heat loss for a fraction of replacement.

Call (613) 324-9141 Get a Free Estimate
  • Every opening measured on-site
  • Full air-seal on every unit
  • Written frame + sealed-glass warranty
Exterior storm window over original heritage window in Montreal

Why it matters

An extra air gap for heritage windows

A storm window adds a second layer of glass — and, more importantly, an insulating air gap — in front of or behind your existing window, cutting drafts and heat loss for a fraction of the cost of full replacement. On character and heritage homes where you want to keep the original wood windows for their look, it is a budget-friendly way to boost comfort without changing the face of the house.

The air gap does the work: it slows heat moving through the assembly and takes the edge off the cold-glass draft from a single-pane original, while the storm itself shields the old sash from wind-driven rain and snow.

It is a practical alternative to replacement in some cases — but not all. Where the primary windows are sound we also handle weatherstripping and window caulking to seal them further; where they are past saving, energy-efficient replacement is the honest call.

Recent install
Storm Window Replacement — Montreal
Storm Window Replacement detail

How it works

From free estimate to installed — in four simple steps

  1. Book the estimate

    Call, text or use the form. We book a free in-home visit — no obligation, no high-pressure sales table.

  2. On-site measure

    We measure every opening, check the frames and sills for rot or water damage, and walk through material, style and glass options in plain language.

  3. Written quote

    Line-item quote with the window line, glass package, U-factor, warranty and haul-away on one page. Financing attached when you want it.

  4. Install, cleanly

    Drop cloths, boot covers and a full air-seal on every unit. Old windows hauled away and a walkthrough of your new windows plus warranty registration.

What you get

Storms that seal, original windows kept

A storm window only helps if it actually seals, so we fit ours tight to the opening rather than leaving the gaps that make cheap storms useless. Interior storms lift out for summer and keep the exterior untouched; exterior storms can be colour-matched to shield the original sash from the weather. Where the primary windows are sound, that tight fit delivers real comfort for modest money.

And where the primary windows are failing — rotted, drafty, fogged — we will say so plainly and point you to window replacement or a full-frame replacement rather than sell a storm over a dying window. Fogged sealed unit instead? That is a foggy unit repair. Honest advice either way.

Storm Window Replacement detail
In writing Warranty
Triple-pane Glass
Air-sealed Install

Related services

More Montreal window replacement options

Other services our crews handle across Montreal.

Full-Frame Replacement

Complete tear-out for rotted frames or sills.

Learn more

Retrofit Replacement

New windows into sound existing frames.

Learn more

Energy-Efficient Replacement

Triple-pane, Low-E and argon for lower bills.

Learn more

Basement Window Replacement

Secure, sealed basement windows.

Learn more

Common questions

Montreal storm window replacement, answered

Air gap, storm-versus-replacement, and interior or exterior.

Yes — the extra pane and, above all, the trapped air gap between the storm and the primary window reduce drafts and heat loss, and the effect is biggest on older single-pane windows that have no insulating value of their own. You will feel less cold radiating off the glass and less draft near the window. A storm will not match the performance of a modern triple-pane unit, but as an add-on to windows you want to keep, it is a real, cost-effective improvement for Montreal winters.
It depends on the condition of your existing windows. Storm windows are a lower-cost boost for primary windows that are still sound and that you want to keep — often original wood windows on a character home. If the primary windows are rotted, drafty, painted shut or fogged, a full replacement almost always pays back more in comfort, efficiency and maintenance, and a storm over a failing window just postpones the inevitable. We look at what you have and give you the honest comparison, including both numbers, so you can choose.
Both work, and the right choice depends on your windows, the look you want and your budget. Exterior storms mount outside and protect the primary window from the weather, but have to shed water and be accessible to install; interior storms mount inside, are easier to fit and remove seasonally, and keep the exterior appearance untouched — often preferred on heritage facades. Either way, a tight seal is what makes them effective. We recommend the option that fits your windows and finish, and install it to actually seal.
Interior storms leave the exterior untouched, and exterior storms can be colour-matched, so on a heritage home the original look is preserved.
Very little — an occasional clean and a check of the seal is all a well-fitted storm window needs to keep doing its job.

Real Montreal reviews

What Montreal heritage-home owners say after storm install

★★★★★ 4.9 · 118 reviews on Google
★★★★★

Wanted to keep our original wood windows so they fitted tight storm windows instead. Noticeably warmer for a fraction of the cost.

H. Ducharme
Homeowner, Montreal
★★★★★

Honest that a storm window made sense on our heritage windows rather than replacing them. Snug fit, real difference.

A. Nijjar
Homeowner, Laval
★★★★★

Cut the draft on our old front windows without changing the look of the house. Exactly what we wanted.

R. Comeau
Homeowner, Longueuil
★★★★

Fitted properly so they actually seal, unlike the loose ones we had. Cozy improvement for the money.

D. Eze
Homeowner, Gatineau

From the blog

Montreal window guides

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Montreal homeowner comparing window options Buying Guide

July 30, 2026 8 min read

How to Choose the Right Windows for Your Montreal Home

Material, style, glass and full-frame vs retrofit — a plain-language guide to picking windows that perform through Montreal winters.

Read article

Ready when you are

Book a free Montreal storm window replacement estimate

Book a free in-home measure and a written, itemized quote for storm window installation anywhere across Montreal and the surrounding towns. A budget-friendly winter barrier fitted to actually seal — with honest advice on when full replacement is the better value. Installed by our own crews, no subcontractors, no pressure.

Call (613) 324-9141 Get a Free Estimate

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