Markham Heritage Estates: Wood Window Replication Rules (Unionville Guide)
Too Long; Didn't Read
- The Law: You cannot put Vinyl windows on a designated Unionville home. You will be fined.
- The Fix: We install Aluminum-Clad Wood windows that match the 1880s profile.
- The Detail: "Simulated Divided Lites" (SDL) must have a spacer bar to pass inspection.
- The Process: We handle the Heritage Permit application for you.
Answer First: If you live in Unionville, Markham Heritage Estates, or Thornhill, your property is likely designated under the Ontario Heritage Act. Vinyl windows are strictly prohibited on the street-facing façade of "Type A" Heritage buildings. You must use Wood or Aluminum-Clad Wood. To get a permit, the "Muntin Bars" (grilles) must be "Simulated Divided Lites" (SDL) with an internal spacer bar to mimic the depth of 19th-century glass. We specialize in getting these permits approved.
The "Stop Work" Order on Main Street
Every spring, we see it. A homeowner in Unionville hires a budget contractor to install white vinyl sliders. Two days later, an Orange Sticker appears on the door. Stop Work Order. Heritage Markham is vigilant. They are not trying to be difficult; they are protecting the architectural integrity that makes your property value so high.
The Rules are Simple:
- Material: Must look like painted wood.
- Operation: Must function like the original (Hung vs Casement).
- Proportion: Glass-to-frame ratio must match the 1880s.
1. Material Options: What is Allowed?
We constantly debate this with the Heritage Committee. Here is the current reality.
| Material | Verdict for "Type A" Heritage | Maintenance | Cost |
|---|---|---|---|
| Solid Wood (Pine/Oak) | Approved. The Gold Standard. | High (Painting every 5-7 years). | $$ |
| Aluminum-Clad Wood | Approved. Wood inside, Aluminum outside. | Low (Factory finish lasts 30 years). | $$ |
| Vinyl (PVC) | BANNED. Looks "plastic" and shiny. | Low. | $ |
| Fiberglass | Conditional. Must have a wood-grain texture. | Low. | $ |
Our Recommendation: Go with Aluminum-Clad Wood (Marvin or Pella). You get the approval because it looks like wood from the curb, but you never have to paint the exterior.
2. The Muntin Bar Mandate (SDL vs. Grilles-Between-Glass)
This is where 90% of permit applications fail. Modern windows have "Grilles Between the Glass" (GBG) for easy cleaning. Heritage Markham HATES this. It looks fake because the glass surface is flat.
The Requirement: Simulated Divided Lites (SDL) To pass inspection, your window must have 3 components:
- Exterior Bar: Aluminum/Wood bar adhered to the outside glass.
- Interior Bar: Wood bar adhered to the inside glass.
- Spacer Bar: A dark bar inside the thermal unit connecting the other two.
- The Effect: It looks like separate panes of glass ("True Divided Lites") when the sun hits it. No "floating" shadows.
3. "Type A" vs. "Type B" Buildings
Not all houses in the district are treated equal.
- Type A (Heritage): The original 1880s farmhouse. Strict Rules. Wood/Clad only. Original openings must be preserved.
- Type B (Non-Heritage/Infill): A house built in 1990 inside the district. Lenient Rules. High-end Vinyl might be allowed if the color matches the neighbourhood palette (e.g., Cashmere or Wicker, not Bright White).
4. The Custom Sash Profile
Standard Home Depot windows have a "boxy" frame profile. Victorian windows have a "Ogee" or "Putty Glaze" profile. We match the profile. We take a slice of your rotting sash, verify the curve, and order custom knives to mill the new wood sash to match.
- Why it matters: The shadow lines on the façade change completely if you use the wrong profile. The Committee notices.
5. Permit Navigation: We Do It For You
Applying for a Heritage Permit is not a "over-the-counter" task. Our Process:
- The Ops: We take photos of the existing rot and argue "Beyond Repair."
- The Drawing: We submit CAD drawings of the proposed cross-section (Sill, Head, Jamb).
- The Sample: We bring a physical corner sample to the committee meeting.
- The Approval: Usually takes 4-6 weeks. Do not schedule installation for tomorrow.
6. Frequently Asked Questions
Q: Can I change from Single Hung to Casement?
A: No. If the original window slid up and down, the new one must look like it slides up and down. We can install "Simulated Hung Casements" (Casements that look like Hungs), but the "Check Rail" must be wide enough to fool the eye.
Q: Does Heritage cover the cost?
A: Sometimes. Markham has a "Heritage Grant Program." If you use approved materials (Wood), they may reimburse up to 50% of the incremental cost of upgrading from Vinyl to Wood (subject to budget). We help with the paperwork.
Q: Why not just repair the old ones?
A: We do. If the wood is 80% sound, we recommend Restoration. But if the sash has dry rot through the tenons, replacement is the only safe option.
7. The Heritage Paint Palette
You cannot paint your new wood windows "Jet Black" just because it is trendy. Unionville has a specific colour palette.
- Approved: Cream, Sage Green, Barn Red, Slate Blue, Taupe.
- Discouraged: Bright White (Reserved for Greek Revival, not Victorian), Stark Black.
- The Tip: We order the Aluminum-Clad windows with a factory finish that matches Benjamin Moore's Historical Collection (e.g., "HC-45 Shaker Beige").
8. Storm Windows: The Invisible Shield
If you decide to restore your original single-pane windows instead of replacing them, you need Storms. Standard Aluminum Storms are ugly. They ruin the profile. We install "Invisible" Storms.
- Low Profile: The frame is hidden inside the brick mould.
- Color Matched: The aluminum matches the sash color exactly.
- Ventilation: They have a bottom slider for airflow.
9. Energy Efficiency: Wood vs. The World
People think old wood windows are drafty. They are only drafty because the weatherstripping failed 50 years ago. A properly restored or new Wood Window is a natural insulator.
- Thermal Break: Wood is non-conductive (unlike aluminum).
- Warm Edge Spacers: Our new units use "Super Spacer" foam, not metal, to prevent edge condensation.
- Low-E 366: We use triple-silver coating to stop UV rays from fading your antique floors.
10. Frequently Asked Questions (Continued)
Q: Can I install new windows without a permit if I don't change the size?
A: NO. In a Heritage District, "Like-for-Like" replacement STILL REQUIRES A PERMIT. The city needs to verify that your definition of "Like-for-Like" matches theirs (i.e., Material and Profile).
Q: How long does the Heritage Permit take?
A: 4 to 8 Weeks. It depends on the committee meeting schedule. We prepare the drawings and samples to ensure it passes on the first try.
Summary
Owning a piece of history in Unionville is a privilege, but it comes with a rulebook. Do not fight the Heritage Board. Work with them. We deliver windows that satisfy the committee and your desire for a warm house.
Got an Orange Sticker? Call us. We speak "Heritage Architect." Check our Residential Window Replacement page for our Clad-Wood options.