Windows, doors and storms in Hamilton's heritage districts

Is your home designated or in a district?

Two kinds of protection matter for windows, both under the Ontario Heritage Act:

• Designated on its own (Part IV). The property has its own designation by-law listing its heritage features. Changes that affect those features need a permit.
• In a Heritage Conservation District (Part V). A whole area is designated. Exterior changes anywhere in the district need a permit, whether or not your house stands out on its own.

The quickest check is the City's heritage mapping page. Its map shows designated properties, the districts, the Municipal Heritage Register and the inventory. If the map leaves you unsure, the City's cultural heritage planners answer questions; the contact is on the heritage windows page.

Listed isn't the same as designated, at least for now. Some older homes are on the City's register without being designated. Ontario gave municipalities until 1 January 2027 to either designate those legacy-listed properties or take them off the register (a legal summary of the change). So a house that's only listed today could be designated soon. If yours is on the register, check its status before you order new windows.

The districts: seven long-standing, plus Melville-Park West

The City lists seven long-standing Heritage Conservation Districts:

• Cross-Melville, in Dundas
• Durand-Markland, in Durand
• Hamilton Beach
• MacNab-Charles, downtown
• Mill Street, in Waterdown, the largest of them
• St. Clair Avenue
• St. Clair Boulevard, whose district plan was never formally adopted and is under review

Council added an eighth in May 2026: Melville-Park West, in Dundas. The by-law designating it was subject to an appeal period when it passed, so check the City's notice for where it stands. Dundas owners now have two districts to look for on the map.

Outside the districts, there are hundreds of individually designated properties, from the old core out to the former towns. A house that isn't in any district can still be designated on its own.

What needs a Heritage Permit, including removable storms

Hamilton's list is broader than most people expect. On a designated property or in a district, the City's Heritage Permits page says you need a permit to replace or install new windows and doors, and it names temporary and removable storm windows and storm doors specifically.

That's the rule that catches people. Clip-on storms or a new storm door feel like accessories, not alterations. In a district, they count. So a permit comes before:

• replacing original or existing windows, whatever they're made of
• putting up new storm windows or storm doors, fixed or removable
• replacing a front door, a back door or a patio door
• changing the size or position of an opening, which also needs a building permit

On an individually designated house, it turns on what the by-law lists as heritage features, which is often the street front. Ask the City rather than guessing about the back or the side. If storms are on your list, storm windows explains the options for older openings.

What usually doesn't

The same page lists work that usually doesn't need a Heritage Permit:

• repairing broken window glass
• weather-stripping
• small repairs done like for like, with the same materials and the same look
• interior work, unless the interior itself is designated

That covers a lot of what goes wrong with old windows. A cracked pane in a Durand sash, new putty on a Mill Street storm, a broken sash cord: those are repairs. If a pane has just broken, broken window glass covers the first steps, and wood window repair covers the slower work of bringing a sash back. "Usually" is the City's word, though. If a repair starts turning into a replacement, ask first.

Applying: drawings, photos, samples and the monthly subcommittee

The application needs enough detail to show how the window looks now and how it'll look after:

• scaled plans and elevations showing the windows
• a survey or site plan
• photos of the house and the windows involved
• product catalogues, samples or paint chips

Applications go to the Heritage Permit Review Subcommittee, which meets monthly, so build that into your timing. There's no application fee.

Ask the pro doing the work whether they can supply the product details, profile drawings or samples the application needs. We connect you with an independent local glass or sash professional. When you send a request, include the address and say the house is designated or in a district, so the pro knows a permit comes first.

If replacement is justified: matching material, profiles and muntins

The City's heritage windows guidance says replacing original windows is usually justified in only two situations: earlier replacements already detract from the building, or the originals are so far gone that little original material would be left after repair. It also makes the case that modern sealed glass often fails and can take the sash with it, which is a big part of why it favours repair.

When replacement is approved, the new windows are expected to be custom-made to match the originals: the same material, the same moulding profiles, the same muntin sizes and the same joinery. Muntins are the thin bars that divide the glass. On an old sash they're slim wood, and a chunky substitute changes the look of the whole front.

Old glass is part of the look too. Original panes often have a slight wave and the odd bubble. When one breaks, ask the pro what they can match before flat modern glass goes in.

Grants and interest-free loans for designated owners

If your property is designated, individually or as part of a district, the City offers two kinds of help, described on its heritage windows page:

• the Heritage Revitalization Grant, a matching grant with separate amounts for reports and for the work itself, and different limits for houses and other buildings
• the Heritage Revitalization Loan, interest-free and paid back over a set term

Amounts, eligible work and intake dates change, so read the City's current terms and talk to the heritage staff before you commit to a contract. Ask for an itemized quote, so the window work is easy to show on its own.

Houses that are only listed, or not on the register at all, don't qualify. The City has no program for ordinary window replacement, and the provincial Home Renovation Savings rebate pays only for new ENERGY STAR certified windows and doors, not for repair. For most designated owners, the heritage grant is the one to look at first.

Penalties, and why the Heritage Permit comes before the building permit

Order matters. If a job needs both, the City won't issue the building permit until the Heritage Permit is approved. Replacing a window at the same size and in the same place doesn't need a building permit where no fire-resistance rating is required, according to the City's building permit page. The Heritage Permit is a separate question, and on a designated house or in a district the answer is yes.

Skipping it isn't a paperwork slip. The City warns that replacing heritage windows without a permit can result in serious fines, and a window that's already in can't be undone cheaply. If in doubt, ask before anyone measures.

When you're ready, tell us the address and what's wrong with the window. We'll pass it to a local pro who takes on older windows, and follow up so it doesn't go quiet. Still weighing a fix against a new window? The repair-or-replace guide walks through it.