Windows & Doors in Lancaster: Lakeside Homes on the St. Lawrence

Lancaster is where Glengarry meets the St. Lawrence: a village at the foot of County Road 34, a Highway 401 interchange, and a shoreline on Lake St. Francis where the wind comes straight off the water. Homes here range from Loyalist-era South Lancaster to lakefront bungalows and cottages that were never meant for year-round living. Unisson Groupe now measures, manufactures, delivers and installs windows and doors in Lancaster from our own factory in Saint-Laurent, roughly an hour and a quarter up the 401.

Why Unisson now serves Lancaster, and what factory-direct means for a lakeside home

Lancaster is really two places with one name. South Lancaster, on the lake at the mouth of the Raisin River, was settled by United Empire Loyalists in the 1780s and is among the oldest communities in eastern Ontario; the village of Lancaster proper grew up a kilometre north after the Grand Trunk Railway put a station there in 1855. Today the village has a few more than 700 residents, South Glengarry's municipal office sits on Oak Street, and exit 814 on the 401 puts Montréal about an hour east and Cornwall twenty minutes west. Most of our Montréal-area clients know the exit as the last one before the Quebec line.

That proximity is why Lancaster was an obvious part of our 2026 expansion into eastern Ontario, which now covers the Ottawa River corridor from Hawkesbury to Ottawa and the whole of Glengarry down to the lake. For a Lancaster homeowner, buying from a manufacturer instead of a dealer means the windows are built at our Saint-Laurent factory to the measurements our own estimator took in your home, installed by our own crews, and covered by one written warranty for product and workmanship together. No showroom margin, no subcontractor, no gap between the company that sold and the company that installed.

South Glengarry is roughly a third francophone and the lakeshore has a growing number of Montréal families who bought cottages during the last few years. Our estimators, office and crews work in English and French, which means the contract can be in whichever language the household reads most comfortably, and the neighbour's can be in the other.

• Manufacturer-direct: built in Saint-Laurent, installed by Unisson crews, RBQ licence 5670-0248
• Close to home: exit 814 on the 401, about 100 km from our factory
• Bilingual: estimate, contract and installation in English or French

Lancaster homes: village lots, lakeshore cottages and what lake wind does to a window

The housing stock splits by geography. In the old village core and South Lancaster you find nineteenth-century brick and frame homes, a few of them genuinely historic, alongside post-war bungalows on the streets between Main and the railway. West of the village along County Road 2, past Cooper Marsh, and east toward Bainsville, the shoreline of Lake St. Francis is lined with waterfront bungalows, converted three-season cottages, and newer builds on the old cottage lots. Inland, on the concessions toward North Lancaster and Williamstown, it is brick farmhouses and country homes on large lots.

Each type fails in its own way. The century village homes have rotted sills, sash-weight pockets that leak air, and no flashing behind the trim. The converted cottages are the hardest cases: they were built for July, with single-pane or thin double-glazed sliders, minimal framing, and no thought given to a January north-westerly. Owners who winterized them in the 1990s often did so with builder-grade vinyl that is now fogged and drafty. The post-war bungalows mostly have second-generation sliders at the end of their seal life and a patio door that faces the lake and leaks.

Lake St. Francis is the climate story here. It is a broad, shallow widening of the St. Lawrence, and wind crossing it arrives at a lakeside window with nothing in the way; residents will tell you the lake kicks up quickly when the wind has been blowing. Winter nights in the minus twenties are normal and cold snaps approach minus 30, but the wind chill on the shore makes a leaky window feel far colder than the thermometer says. Add year-round humidity from the water and the marsh, spring and fall freeze-thaw cycling, and driving rain against the windward wall, and you have conditions that expose any weak seal within a season or two.

• Century village homes: sill rot, sash-weight drafts, no flashing
• Converted cottages: summer-grade windows facing a winter lake
• Lakefront bungalows: worn sliders and patio doors on the windward side

Which products fit Lancaster and the lakeshore

For any wall facing the lake, our recommendation is triple-glazed UPVC windows in casement or fixed-plus-awning combinations. A casement closes against a compression seal with a multi-point lock, which is the tightest arrangement against sustained wind and driving rain; large fixed panes flanked by operable awnings give the lake view without the air leakage of a wide slider. UPVC frames are welded, do not corrode or rot in a humid lakeside environment, and never need paint, which matters when one side of the house takes the weather.

For the brick and painted homes of the village and South Lancaster, our hybrid windows put an aluminum-clad exterior in your chosen colour over a UPVC core, so the street side keeps its character. Every window we make is ENERGY STAR certified under Canada's single national specification in force since 2020: a U-factor of 1.22 W/m²·K or lower, or an Energy Rating of 34 or higher. Our triple-glazed, argon-filled, low-E units exceed those figures, and on a lakeside wall that surplus is exactly what keeps the glass warm enough to stop condensation from forming when the humidity is high and the wind is up.

Doors on the lake side deserve special care. Our patio doors are built as single factory assemblies with triple glazing, multi-point locking and a low-profile sill that drains outward instead of pooling meltwater; for a cottage conversion, a swing patio door often seals better than a slider. Our insulated steel and fibreglass entry doors have a thermal break and adjustable thresholds. All are ENERGY STAR certified and measured by the same estimator.

• Triple-glazed UPVC casements: tightest seal for the windward lake wall
• Fixed-plus-awning combinations: big lake views without slider air leakage
• Patio and entry doors: factory assemblies, multi-point locks, drained sills

Ontario specifics: building code, rebates and permits in South Glengarry

Lancaster is in the Township of South Glengarry, whose building department in Lancaster administers the Ontario Building Code; the 2024 edition has applied since January 2025. For replacement windows the code questions are narrow: a bedroom window used as an emergency exit must keep the required clear opening, and any new or enlarged opening must meet structural and energy rules. Our windows are specified above Ontario's SB-12 energy requirements for new houses, so compliance on a replacement is not the issue; catching the egress cases and the cottage conversions that need more than a window is our estimator's job.

As of late summer 2026, the federal Greener Homes grant and loan are closed to new applicants and Ontario has not yet joined the federal Greener Homes Affordability Program. The active provincial program is the Home Renovation Savings Program, delivered by Save on Energy with Enbridge Gas, which has been offering a fixed rebate per eligible ENERGY STAR window or door opening, generally with a minimum number of openings and, on some paths, combined with another upgrade. Homes heated by electricity, propane or oil have qualified alongside gas customers, which covers most of the lakeshore. Terms change and funding can end early, so confirm on the program site; we provide the ENERGY STAR documentation.

On permits, the general Ontario rule is that a same-size replacement in the existing opening does not require a building permit, while enlarging or adding an opening does, and South Glengarry's building department can confirm for your address. Two Lancaster-specific points: waterfront properties may fall within the Raisin Region Conservation Authority's regulated area, which matters if a project touches the structure near the shoreline, and converting a three-season cottage to year-round use is more than a window job. We flag both at the estimate.

• Same-size replacement: generally no permit; confirm new or enlarged openings with South Glengarry
• Waterfront: conservation authority rules may apply to structural work near the shore
• Rebates: electric, propane and oil heat have qualified alongside gas; verify current terms

How it works from Montréal: measure, build, deliver, install

It starts with a free in-home estimate. Our estimator drives down the 401 to Lancaster, measures every opening, inspects sills and framing, looks at the windward wall with particular care, and leaves a written, itemized quote with no obligation. Many lakeshore clients start with the lake-facing side and phase the rest. Once you approve, your windows are built at our Saint-Laurent factory to the measured dimensions; typical lead time is four to eight weeks, longer at the spring peak.

Delivery and installation are done by Unisson crews, never a subcontractor. Lancaster is about an hour and a quarter from the factory, so the crew arrives with your units in the morning; a typical bungalow of eight to ten windows and a patio door is done in one to two days. We remove old units, repair minor sill damage, insulate every perimeter with low-expansion foam, flash and seal against wind-driven rain, install trim and take the debris away. Winter work proceeds one opening at a time so a lakeside house is never open to the wind.

Unisson backs its installations for 10 years, on top of the manufacturer's warranty we provide on the windows and doors themselves; one company, one call. Financing is available for Ontario clients, which makes it realistic to do a whole cottage conversion in a single season rather than living with the worst windows for another winter.

• Free estimate: in-home measurement and written quote, English or French
• Factory build: Saint-Laurent, typically 4 to 8 weeks
• Unisson crews: delivery, installation and cleanup, year-round
• Warranty and financing: 10-year installation warranty; monthly plans available

Frequently Asked Questions