We're Proud To Install ThermoProof Windows
ThermoProof windows are high-performance PVC windows and doors manufactured in Cobble Hill, right here on Vancouver Island, BC. Shoreline Building Performance installs them for homeowners across the Island, from Victoria to Campbell River. Local windows, fitted by local installers, backed with building-science and rebate know-how.
- BC-made in Cobble Hill since 1977
- Fitted by local crews
- Designed for the coastal climate
- BC Hydro rebate experise
Who Makes ThermoProof, and Where?
ThermoProof Windows & Doors is a Vancouver Island window manufacturer that has been designing and building windows on the Island since 1977. Its main factory sits at 3744 Trans-Canada Highway in Cobble Hill, in the Cowichan Valley, with a second location on Cliffe Avenue in Courtenay serving the North Island.
ThermoProof describes itself as the longest-running Canadian-owned and operated window manufacturer on Vancouver Island, employing over 50 people and sourcing its suppliers in Canada.
That’s nearly fifty years building for one climate rather than a national average — the practical advantage of a manufacturer that designs specifically around coastal BC conditions.
Island-Made, Island-Installed
Windows made on Vancouver Island don’t cross a border to reach you. In a period of shifting Canada–US trade policy, imported building materials carry cost and timeline risk that locally manufactured products simply don’t. ThermoProof units travel a few hours up the highway to your home instead of clearing customs, while supporting Island jobs and Canadian suppliers.
Shoreline fits them with building-science precision, so a locally made window becomes a genuinely high-performance one.
Why Choose BC-Manufactured Windows Over Imported?
Buying windows made on Vancouver Island means your product isn’t crossing a border to reach you. Imported building materials carry cost and timeline risk that locally manufactured products don’t. Customs delays, import costs layered onto a quote mid-project, and after-sales parts that ship from overseas can all slow your project.
Windows made here travel a few hours up the highway instead of clearing customs. Lead times are shorter, service and replacement parts stay on the Island, and the products are designed around coastal BC conditions rather than adapted from another market.
What Island-made actually gets you:
- No cross-border import exposure — no customs delays or import costs added mid-project
- Shorter lead times — local production and delivery, not a container crossing a border
- Replacement parts stay close — service and after-sales support come from the Island
- Built for this climate — designed around coastal BC, not a national average
- Local economic benefit — your money supports Island jobs and Canadian suppliers
Built for Vancouver Island’s climate:
- Multi-chamber thermal profiles for insulation and structural rigidity
- Fusion-welded frame construction for seamless, water-resistant corners
- Low-E coatings and high-performance glazing for summer heat and winter warmth
- Hardware and finishes chosen for salt-air exposure and durability
- NAFS-rated systems tested to North American fenestration standards
What Shoreline Adds as Your ThermoProof Installer
A window only performs as well as its installation. Shoreline’s crews are trained in building science, so a ThermoProof unit goes in airtight, correctly flashed, and integrated with your home’s air barrier and water-resistive barrier.
We look at the whole house — insulation, moisture, ventilation — not just the opening in front of us. That’s the difference between a high-performance window and a high-performance home.
Where on Vancouver Island We Install ThermoProof
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Shoreline installs ThermoProof windows and doors across Vancouver Island — every major municipal area from the South Island to the North Island and out to the West Coast. Wherever you are, the windows are made here and fitted by a local crew.
| Region | Communities we install in | Local hub |
|---|---|---|
| South Island | Victoria, Saanich, Oak Bay, Esquimalt, View Royal, Colwood, Langford, Sidney, North Saanich, Sooke | Victoria |
| Cowichan Valley | Duncan, North Cowichan, Chemainus, Ladysmith, Cobble Hill, Mill Bay, Shawnigan Lake | Duncan |
| Central Island | Nanaimo, Lantzville, Cedar, Parksville, Qualicum Beach, Nanoose Bay | Nanaimo |
| West Coast | Port Alberni and the Alberni Valley | Port Alberni |
| Comox Valley | Courtenay, Comox, Cumberland, Union Bay | Courtenay |
| North Island | Campbell River, Black Creek, Oyster River | Campbell River |
Not sure if you’re in range? Call (778) 907-9119 or book a free assessment — if we can’t reach you, we’ll tell you straight away.
Book Your Free Window & Door Assessment
ThermoProof windows, made in Cobble Hill and fitted by your Island neighbours. From consultation to rebate paperwork, Shoreline handles the whole project across Vancouver Island.
Book a free in-home consultation, or call (778) 907-9119. If we can’t reach your address, we’ll tell you straight away.
Do ThermoProof Windows Qualify for BC Hydro Rebates?
Qualifying ThermoProof windows and doors can be eligible for BC Hydro’s window and door rebate when they meet the required Tier 2 efficiency level and are installed by a licensed contractor — which Shoreline is. Because the rebate is paid per rough opening, replacing more windows increases what you can claim, up to the program maximum of $2,000, and completing another qualifying upgrade can add a bonus rebate. Full current amounts and eligibility are on the official BC Hydro source; we’ll confirm which of your selected units qualify during your assessment.
BC Hydro Window & Door Rebates
- Windows must meet Tier 2 ENERGY STAR® efficiency
- Installed by a licensed contractor — which Shoreline is
- Paid per rough opening — replacing more increases your claim
- Program maximum of $2,000; bonus rebate for bundled upgrades
ThermoProof Windows
Shoreline installs the full range of ThermoProof window systems, matched to your home’s style and exposure:
- Casement and awning windows
- Sliding and single-hung windows
- Picture windows, and bay & bow assemblies
- Double- and triple-pane sealed units with Low-E glass
- Custom fenestration for heritage openings and architectural projects
ThermoProof Doors & Options
- Patio and sliding doors
- French doors and folding door systems
- Exterior entry doors with multi-point locks
Colours, glass & grids: custom colour, obscure glass, and decorative grid options let a replacement match a character home’s original detailing or take a contemporary direction.
Skilled Installation, Island-Wide
A window only performs as well as its installation. Our crews fit every ThermoProof unit to code and manufacturer requirements, capturing the label documentation your rebate claim needs — then check airtightness and performance and finish the paperwork on our end. Here’s how a typical project runs.
Free In-Home Consultation & Measure
Built at the Cobble Hill Factory
Certified Installation & Review
Bundling With Other Upgrades? Even Better
Combine window installation with:
- Attic or exterior wall insulation
- Heat pump & HVAC upgrades
- Solar panel installation
- Air-sealing and ventilation improvements
Bundling upgrades improves whole-home efficiency and can unlock a bonus rebate.
More Than Just Window Installation Contractors
We specialize in:
- Solar Panel Installation: certified solar PV system design and install
- HVAC System Design: right-sized heating, cooling, and ventilation
- Whole-Home Energy Retrofits: plans tailored to your home’s unique needs
- Building Envelope Work: air barriers, vapour control, moisture management
We do more than meet code. Shoreline BP optimizes comfort, efficiency, and durability for the long haul.
Frequently Asked Questions
Where are ThermoProof windows made?
ThermoProof windows are manufactured in Cobble Hill, British Columbia, in the Cowichan Valley on Vancouver Island, where the company has built windows since 1977. A second ThermoProof location in Courtenay serves the North Island.
Are ThermoProof windows a good choice for a coastal home?
They’re designed for exactly this climate. ThermoProof has manufactured on Vancouver Island for nearly five decades, building systems around coastal BC conditions — sun exposure, salt air, and wind-driven rain — with multi-chamber profiles, fusion-welded frames, and Low-E glazing.
Why buy BC-manufactured windows rather than imported ones?
Locally manufactured windows don’t cross a border to reach you, so your project avoids import costs, customs delays, and the uncertainty of shifting trade policy. Lead times are shorter, after-sales service and parts stay on the Island, and your spending supports local manufacturing jobs.
Does Shoreline install ThermoProof windows across all of Vancouver Island?
Yes — across the Island’s major municipal areas, including Victoria and the South Island, Duncan and the Cowichan Valley, Nanaimo and the Central Island, Port Alberni, the Comox Valley, and Campbell River. Call us to confirm coverage for your address.
Do ThermoProof windows qualify for rebates?
Qualifying windows and doors that meet the required efficiency tier can be eligible for BC Hydro’s window and door rebate when installed by a licensed contractor. We’ll confirm which of your selected units qualify during your free assessment and handle the documentation on our end.
Who warranties the windows?
The product warranty is provided by ThermoProof as the manufacturer; Shoreline warranties its installation work. We’ll walk you through both before you commit.
Reviewed by Ron McLaughlin, Red Seal Certified Carpenter & Registered Energy Advisor, Shoreline Building Performance. Last updated: 2026-08-06
