London, Ontario · Window Specialists

New Windows, Warmer Rooms, a Quieter Home

Replacement and installation windows for London homes — built for freeze-thaw winters, humid summers, and the character of the neighbourhood you live in. From a single drafty unit to a whole-house upgrade, every project starts with an on-site assessment and ends with a written, fixed-price quote.

Book an On-Site Assessment Call (613) 324-9141
Written fixed-price quote after an on-site assessment
ENERGY STAR–certified units for the London climate
Clear opening confirmed in writing on every egress project
Written workmanship warranty at project close-out
Modern London home with large energy-efficient windows in daylight On-site assessment · No cost, no obligation
Bright modern London living room interior with new windows
About Windows London

Windows are the only trade we practise.

That focus matters more than most homeowners expect. A window is not just a pane of glass — it is a weather seal, a structural opening, an energy boundary, and, in a bedroom, a life-safety exit. Getting all of that right in a London home means understanding how a 1920s Old South brick two-storey behaves differently from a 1990s Stoneybrook build, how a below-grade basement opening in Byron drains, and how a west-facing Masonville living room bakes in August. We bring years of hands-on experience across the region to every measurement, order, and installation.

Our work covers the full window lifecycle: measuring existing openings, recommending the right style and glazing package, ordering to exact specification, removing the old unit, installing and sealing the new one, and finishing the interior trim. Because we specialise, we can be specific about the things that actually determine whether a window performs — the clear opening a casement delivers versus its frame size, the difference argon fill and a low-emissivity coating make through a London winter, and how a retrofit installation compares with full-frame replacement when the existing frame is sound.

London's housing stock is unusually varied, and windows are where that variety shows up most. The turn-of-the-century Victorian and Edwardian homes of Old North and Old South carry tall, narrow openings and heritage sightlines that a stock unit will not respect. Post-war bungalows across Westmount and Oakridge often have smaller original openings and basements that were never meant to be lived in. The 1980s-through-2000s builds of Stoneybrook, Uplands, and Sunningdale tend to have larger openings and sealed units now reaching the end of their service life. Newer Hyde Park, Riverbend, and Talbot Village homes are a different conversation again. Knowing how each of these behaves — how they settle, where they leak, what the openings will accept — is the difference between a window that merely fits and one that performs for decades.

You will not find a founding-year story or a project-count headline here, because those are not what keep water out of your wall or heat inside your home. What we offer instead is process you can hold us to: a documented on-site assessment, a written quote with no moving numbers, honest guidance on which windows qualify for current rebate programs, and a workmanship warranty put in writing. Everything we commit to is something we do on every job.

Why Choose Us

Why London homeowners choose Windows London

Six reasons rooted in what we actually do on every job — not in claims you'd have to take on faith.

01

Windows are all we do

Specialisation is the whole point. Because we do not split attention across roofing, siding, and general renovation, we know window styles, glazing packages, frame materials, and installation methods in depth — and we can explain the trade-offs in plain language before you commit to anything.

02

Climate-appropriate recommendations

London sits in a climate of cold, freeze-thaw winters and warm, humid summers. We recommend glazing and frame packages suited to that reality — double or triple-pane sealed units, low-emissivity coatings, and argon fill where it earns its cost — rather than a single default product pushed on every home.

03

Permits handled where they apply

A straightforward like-for-like window replacement in the same opening generally does not require a building permit in London. But enlarging an opening, cutting a new one for a basement egress window, or working on a heritage property changes that. We tell you up front which category your project falls into and coordinate the approvals that apply.

04

Documented quality steps

Every installation follows the same documented sequence: confirm measurements, protect the interior, remove the old unit, set and shim the new one to square, insulate and air-seal the perimeter, and finish the trim. On egress projects we confirm the clear opening in writing so it meets the Ontario Building Code before we finish.

05

Rebate guidance without pressure

Ontario's Home Renovation Savings Program offers $100 per eligible rough opening for ENERGY STAR–certified windows. We help you understand whether your project and product selection qualify and how the documentation works — factual guidance, not a pressure tactic.

06

Fixed price and written warranty

After the on-site assessment you receive a written, fixed-price quote. The workmanship warranty is delivered in writing at project close-out. No verbal promises, no numbers that drift between the estimate and the invoice.

Window Services

Window services we offer in London

Each service shows an indicative price range based on published 2025–2026 Ontario-market pricing. Ranges are starting points for conversation — your price is always the written quote after an on-site assessment.

Casement window with side hinge and crank

Casement windows

Hinged at the side and cranked open like a small door, casement windows seal tightly against London winds and deliver the largest clear opening for their frame size — the go-to choice for basement egress.

$650 – $1,300 / window
Double-hung window in a bright room

Double-hung & single-hung

The classic vertical-sliding style that suits Old North and Old South character homes. Double-hung sashes tilt in for cleaning.

$500 – $1,100 / window
Horizontal slider window in a dining room

Slider windows

Horizontal-gliding units that are simple, budget-friendly, and well suited to wider openings in bedrooms and living spaces.

$450 – $950 / window
Large picture window with a view

Picture & fixed windows

Non-opening units that maximise light and view — ideal for feature walls and stairwells. No operating hardware often means lower cost per square foot.

$500 – $1,400 / window
Awning window above a kitchen counter

Awning windows

Hinged at the top and opening outward, awnings shed rain while ventilating — a practical pairing above a picture window or in a bathroom.

$550 – $1,150 / window
Bay window with a window seat

Bay & bow windows

Multi-unit assemblies that project outward to add space and light, common in living and dining rooms. Several units plus structural support sit above single-window pricing.

$2,500 – $6,500 / assembly
Basement egress window detail

Basement egress windows

A code-driven service: enlarging or cutting a foundation opening so a basement bedroom has a compliant emergency exit. Scope includes excavation, concrete cutting, the window, a well, and drainage.

$3,000 – $8,000 / window
London home exterior after full window replacement

Full-house replacement

Replacing every window in one coordinated project lowers the per-unit cost through a single mobilisation and bulk glass ordering.

$10,000 – $30,000+
Indicative Pricing

What windows cost in London

All figures are based on published 2025–2026 Ontario-market pricing and are indicative only. Your binding price is the written, fixed-price quote after an on-site assessment.

Full-house window replacement

$10,000 – $30,000+

Replacing every window in one coordinated visit lowers the per-unit cost through a single mobilisation and bulk glass ordering — the most cost-effective way to upgrade an entire London home.

Casement window
$650 – $1,300
Double-hung / single-hung
$500 – $1,100
Slider window
$450 – $950
Picture / fixed window
$500 – $1,400
Awning window
$550 – $1,150
Bay / bow assembly
$2,500 – $6,500

Indicative pricing note — please read

Several factors shift a quote within these ranges: the number of windows (bundling several lowers the per-unit cost), window size and style, frame material (vinyl is most cost-effective; fibreglass and wood sit higher), and glazing package (triple-pane and low-emissivity coatings add cost but cut heat loss). A full-frame replacement costs more than a retrofit but performs better where the existing frame has failed. Your price is the written quote you receive after the on-site assessment, not a figure from this page.

These ranges exclude:

  • Building permits, where required, billed at cost.
  • Structural work such as new lintels for enlarged openings, quoted separately after assessment.
  • HST, applied on top of the quoted amount.
  • Unforeseen conditions found once an old unit is removed — rot, hidden water damage, or out-of-square framing — discussed and approved before any extra work proceeds.

Indicative pricing is provided for planning only and is not an offer to contract. A binding price is issued solely as a written, fixed-price quote following an on-site assessment.

Problems We Solve

Common window problems we solve

Each tied to a real London condition — the climate, the housing stock, or the building code.

Drafts & rising heating bills

London's freeze-thaw winters are unforgiving on aging sealed units. When the seal fails or the frame warps, warm air leaks out and hydro bills climb. Replacing failed units with properly air-sealed ENERGY STAR windows is one of the most direct comfort upgrades an older London home can make.

Condensation & fogging between panes

Moisture or a foggy film trapped between the glass layers is a sign the sealed unit has lost its gas fill and its insulating value. This is not a cleaning problem — it is a failed unit, and it will keep getting worse. We confirm whether a glass-pack replacement or a full unit replacement is the right fix.

Basement bedrooms that aren't legal

Many older London homes have small basement windows that do not meet the Ontario Building Code's egress requirement. If a below-grade room is used for sleeping, it needs a compliant emergency exit — and without one, it cannot legally be called a bedroom when you sell, and your insurer may take issue. We handle the opening, the window, and the well so it passes inspection.

Heritage character you don't want to lose

In neighbourhoods like Wortley Village, Old North, and the city's Heritage Conservation Districts, the look of a street-facing window is part of what makes the home worth what it is. We help you choose units that preserve sightlines and proportions while improving performance, and we flag when a Heritage Alteration Permit applies.

Windows that stick, jam, or won't lock

Decades of paint, settling, and seasonal swelling leave older sashes hard to open — a real problem when that window is also your fire exit. New units restore smooth operation and a secure lock, which matters as much for safety as for convenience.

Water intrusion around the frame

Staining, soft trim, or damp drywall below a window usually points to a failed perimeter seal or flashing. Left alone, water finds the wall cavity. We remove the unit, inspect the opening, correct the sealing and flashing, and install so water is directed out, not in.

Homeowner Checklist

The standard we work to

Whether or not you hire us, these are the standards a London window project should meet. Use them to hold any contractor accountable.

The standard we work to

  • Clear opening confirmed in writing on any egress window — the code minimum is 0.35 m², with no dimension under 380 mm.
  • ENERGY STAR–certified units specified where rebate eligibility matters.
  • A written, fixed-price quote issued after an on-site measurement — not a phone estimate.
  • Perimeter air-sealing and insulation included in the installation, not treated as an extra.
  • Interior trim finish included and specified in the quote.
  • Heritage Alteration Permit addressed before work starts on any designated property.
  • A written workmanship warranty delivered at close-out.

Questions to ask any contractor — before you sign

  • What is the exact clear opening of the window you're proposing for my egress project — in writing?
  • Is this a retrofit or a full-frame installation, and why is that the right choice for my opening?
  • Are the units ENERGY STAR certified, and does my project qualify for the Home Renovation Savings Program?
  • Does my property need a building permit or a Heritage Alteration Permit, and who handles it?
  • What does the quote include for air-sealing, insulation, and interior trim?
  • Is the price fixed in writing, and what happens if unforeseen conditions appear once the old unit is out?
  • What warranty do I receive in writing, and what does it cover?
How It Works

A clear process, start to finish

Six steps, each with a commitment we control — response times, quote timelines, and inspection stages.

Step 01

First contact & quick screen

Call or submit the contact form. We respond within one business day, ask a few questions about your home and the windows in question, and book a convenient time for an on-site assessment.

Step 02

On-site assessment

We measure each opening precisely, check for water intrusion or structural concerns, confirm whether your project needs permits or heritage approval, and talk through style, glazing, and rebate options with you.

Step 03

Written fixed-price quote

You receive a written, fixed-price quote — typically within two business days — itemising windows, installation, and interior trim, with permit and engineering costs, where they apply, clearly identified.

Step 04

Order & scheduling

Once you approve the quote, we order your units to exact specification and book an installation date. We tell you the realistic lead time up front; custom sizes and triple-pane packages take longer than standard units.

Step 05

Installation

We protect your interior, remove the old units, set and shim the new ones square, air-seal and insulate the perimeter, and finish the trim. On egress projects the clear opening is confirmed before we complete.

Step 06

Walk-through, warranty & rebate paperwork

We walk the finished work with you, confirm every unit operates and locks correctly, deliver your written workmanship warranty, and hand over the product documentation you need for a Home Renovation Savings Program claim.

Service Areas

London neighbourhoods & areas we serve

We install and replace windows across the City of London and its surrounding communities.

Old North
Old South
Wortley Village
Woodfield
Downtown London
Old East Village
Byron
Oakridge
Westmount
Hyde Park
Masonville
Old Masonville
Sunningdale
Stoneybrook
Stoney Creek
Uplands
Sherwood Forest
Orchard Park
University Heights
Whitehills
Riverbend
West 5
Talbot Village
Lambeth
Warbler Woods
White Oaks
Westminster
Summerside
Pond Mills
Glen Cairn
Argyle
Huron Heights
Northridge
Kilally
Fox Hollow
Upper Richmond Village

Just outside the city, we also serve nearby communities such as Komoka, Kilworth, Ilderton, Arva, and Dorchester within Middlesex County. If you're not sure whether your street is in our service area, call and ask.

London Window Guide

Codes, permits & local conditions

The real regulations, fees, and building-code values that shape a London window project.

Sunlit London home interior with a large window

When you need a building permit in London

The City of London does not require a building permit for replacing a window in an existing opening when there is no structural change — a like-for-like swap is treated much like replacing siding. The moment you enlarge an opening, cut a new one, or alter a lintel or load-bearing element, a permit is required. For single-family dwellings, the city's building permit review time is 10 business days for a complete application. When a permit does apply, the cost is billed to your project at the city's current rate.

Basement egress: the Ontario Building Code numbers

If a basement room is used for sleeping, the Ontario Building Code requires an egress window with an unobstructed opening of at least 0.35 square metres (about 3.77 square feet), with no single dimension smaller than 380 mm, and a sill no higher than 1,000 mm from the floor. Below-grade openings need a window well with at least 550 mm of clearance, and wells deeper than 1,100 mm require a permanent ladder or steps. Because a casement's whole sash swings clear, it often meets the opening requirement in a smaller — and less expensive — frame than a slider. We confirm the clear opening in writing before installation.

Natural light & ventilation requirements

Beyond egress, the Ontario Building Code requires bedrooms to have unobstructed glazing equal to at least 5% of the floor area served for natural light. It is a factor worth considering when a renovation changes how a room is used, and it shapes the glass area we recommend for below-grade and interior conversions.

Heritage properties & conservation districts

London protects heritage through individual designations and Heritage Conservation Districts, including areas within and around Wortley Village, Old North, and Woodfield. On a designated property, exterior changes that affect heritage attributes — which street-facing windows often do — require a Heritage Alteration Permit before a building permit can be issued. There is no fee for a Heritage Alteration Permit in London, and the city's Heritage Planners can be reached at 519-661-4980 to confirm whether your project needs one. Non-designated properties merely listed on the Register do not require this permit for alterations.

Conservation authority regulated areas

Parts of London near the Thames River and its tributaries fall within areas regulated by the Upper Thames River Conservation Authority. If your property is in a regulated area, certain work may need UTRCA permission before it starts. It rarely affects a simple window swap, but it is worth checking for below-grade or exterior structural work near the river.

Choosing frame material for a London home

Frame material is a genuine performance-and-budget decision, not just a finish choice. Vinyl is the most cost-effective option and insulates well, which is why it is the default for many London replacements. Fibreglass costs more but resists the expansion and contraction that freeze-thaw cycles drive, holding its shape and seal over a longer life. Wood offers the warmth and authenticity that heritage streets call for, at a higher price and with more maintenance. We walk you through the trade-offs against your specific openings rather than defaulting to one product for every home.

Building for London's climate & the rebate that helps

Southern Ontario's frost line sits around 1.2 metres deep, which matters when a deep window well needs its own footing below frost. London's freeze-thaw cycles and humid summers also make glazing choice a genuine performance decision, not just an aesthetic one. On the incentive side, Ontario's Home Renovation Savings Program — delivered through Save on Energy and running to November 30, 2026 — offers $100 per eligible rough opening for ENERGY STAR–certified windows and doors, with a minimum of three openings. It is a rebate paid after installation, not a discount at purchase, so we help you keep the documentation you'll need to claim it.

In Their Words

What London homeowners say

Comments from homeowners across the city, attributed by neighbourhood.

“The assessment was thorough and the quote was in writing with no surprises later. Our Old South living room is warmer and the street noise is noticeably down.”

— Homeowner, Wortley Village

“They confirmed the clear opening in writing before ordering, so our basement bedroom passed inspection the first time. That gave us real peace of mind.”

— Homeowner, Byron

“We were worried about keeping the character of our heritage home. They flagged the permit early and helped us pick units that kept the look.”

— Homeowner, Old North

“Whole-house replacement done in a coordinated schedule. The crew air-sealed every opening and finished the trim cleanly. The hydro bill difference showed up fast.”

— Homeowner, Masonville

“Straightforward guidance on the rebate — no pressure, just what qualified and how the paperwork worked. Refreshingly honest.”

— Homeowner, Hyde Park

“A foggy sealed unit we'd lived with for years turned out to be a simple fix once they diagnosed it properly. Clear explanation, fair written price.”

— Homeowner, Oakridge
FAQ

Frequently asked questions

Answers grounded in London's permit process and the Ontario Building Code.

Do I need a building permit to replace my windows in London?+
Not usually. The City of London does not require a permit for replacing a window in an existing opening with no structural change. You do need one if you enlarge the opening, cut a new one, or alter a lintel or load-bearing element. For single-family homes, the city's permit review time is 10 business days for a complete application.
How much does window replacement cost in London?+
Based on published 2025–2026 Ontario-market pricing, most single replacement windows fall between roughly $450 and $1,400 installed depending on style, size, frame material, and glazing, and a whole-house project typically ranges from $10,000 to $30,000+. These are indicative figures only — your price is the written, fixed-price quote after an on-site assessment.
What size does a basement egress window have to be?+
The Ontario Building Code requires an unobstructed opening of at least 0.35 square metres (about 3.77 square feet), with no dimension smaller than 380 mm, and a sill no higher than 1,000 mm from the floor. A casement window often meets this in a smaller frame because its whole sash swings clear.
Do basement window wells have code requirements too?+
Yes. A window well must give at least 550 mm of clearance in front of the window, and if the well is deeper than 1,100 mm it needs a permanent ladder or steps. Proper drainage is required so water does not pool against the foundation.
Which window style is best for a London basement bedroom?+
Casement windows are usually the best egress choice because the entire sash opens, delivering the largest clear opening for the frame size — which can meet code in a smaller, more affordable unit than a slider would need.
Are there rebates for new windows in Ontario right now?+
Yes. Ontario's Home Renovation Savings Program offers $100 per eligible rough opening for ENERGY STAR–certified windows and doors, with a minimum of three openings, and it runs to November 30, 2026. It is delivered through Save on Energy and paid after installation, so keep your product documentation and invoice.
What's the difference between retrofit and full-frame replacement?+
A retrofit installs the new unit into the existing frame and is less costly when that frame is sound. A full-frame replacement removes everything down to the rough opening — more work, but the right choice when the old frame has rotted, leaked, or fallen out of square. We recommend the correct method after seeing the opening.
Do double or triple-pane windows make a real difference in London?+
Yes. Triple-pane sealed units reduce heat transfer meaningfully compared with double-pane and cut noise as well, which matters through London's cold winters. Double-pane units with a low-emissivity coating and argon fill are the common standard and already exceed baseline efficiency for the region.
My windows are foggy between the panes — can that be fixed?+
Fog or moisture between the panes means the sealed unit has lost its gas fill and its insulating value. It is not a cleaning issue. Depending on the frame's condition, the fix is either a replacement glass pack or a full new unit; we confirm which after inspecting it.
I live in a heritage home — can I still replace my windows?+
Often yes, but if your property is individually designated or sits in a Heritage Conservation District, exterior changes affecting heritage attributes require a Heritage Alteration Permit before a building permit is issued. There is no fee for the permit in London, and we help you choose units that preserve the home's character.
How long does a window installation take?+
A standard replacement window is typically installed in well under a day per unit, and many whole-home projects are completed in one to a few days depending on count. A basement egress installation involving concrete cutting and a window well usually takes one to two days once approvals are in place.
Do you provide a warranty?+
Yes. We deliver a written workmanship warranty at project close-out, separate from the manufacturer's product warranty on the units themselves. Both are documented so you have them on record.
What areas around London do you cover?+
We serve the City of London — from Old North and Old South to Byron, Masonville, Hyde Park, Westmount, and beyond — plus nearby Middlesex County communities such as Komoka, Kilworth, Ilderton, Arva, and Dorchester. If you're unsure about your street, just call and ask.
Get Started

Get your window project started

One drafty unit or every window in the house — the next step is the same: a no-cost, no-obligation on-site assessment and a written, fixed-price quote. We respond to every enquiry within one business day.

(613) 324-9141
Response commitment
Reply within one business day; written quote typically within two business days of your on-site assessment.
Service area
The City of London and surrounding Middlesex County communities.
The offer
On-site assessment — no cost, no obligation — followed by a written, fixed-price quote.
Call Now Get a Quote