Beyond single buildings
Heritage district candidates
A heritage conservation district (Part V of the Ontario Heritage Act) protects a whole area at once. These are the tightest clusters of listed buildings that lose protection on January 1, 2027: 61 areas holding 1,598 at-risk buildings. Each could be the start of a request for a district study.
Aurora
| Area | Buildings | Size | Built (median) | Next to a district |
|---|
| Temperance St | 18 | 0.1 ha | – | – |
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Hamilton
| Area | Buildings | Size | Built (median) | Next to a district |
|---|
| Market St, Hess St N, Napier St | 58 | 2.1 ha | – | – |
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| Hess St S, Bold St, Duke St | 57 | 2.2 ha | – | – |
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| Mary St, Murray St E, Catharine St N | 49 | 1.8 ha | – | – |
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| Mary St, Elgin St, Robert St | 46 | 1.8 ha | – | – |
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| Spring St, Jackson St E, Hunter St E | 41 | 1.4 ha | – | – |
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| Markland St, Caroline St S, Bruce St | 36 | 1.6 ha | – | – |
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| Robert St, Catharine St N, John St N | 32 | 1.2 ha | – | – |
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| Hughson St N, John St N, Robert St | 28 | 0.9 ha | – | – |
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| Wesanford Pl, Hunter St W, Jackson St W | 27 | 1.1 ha | – | – |
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| Queen St S, Hess St S, Charlton Ave W | 27 | 1.0 ha | – | – |
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| Hess St S, Queen St S, Duke St | 26 | 0.1 ha | – | – |
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| James St N, Murray St E, Hughson St N | 23 | 0.8 ha | – | – |
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| King St W, Market St, Caroline St N | 22 | 0.7 ha | – | – |
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| Wilson St, Ferguson Ave N, Cathcart St | 22 | 0.8 ha | – | – |
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| John St N, King St E, King William St | 21 | 0.7 ha | – | – |
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| Queen St S, Markland St, Hess St S | 21 | 0.9 ha | – | – |
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| John St N, Catharine St N, Murray St E | 21 | 0.8 ha | – | – |
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| Cannon St E, Catharine St N, Mary St | 20 | 0.7 ha | – | – |
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| Walnut St S, Jackson St E, Hunter St E | 19 | 0.6 ha | – | – |
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| Markland St, Herkimer St, Hess St S | 19 | 0.7 ha | – | – |
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| Wellington St N, Cathcart St | 18 | 0.6 ha | – | – |
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| Herkimer St, Queen St S, Hess St S | 17 | 0.7 ha | – | – |
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| Murray St E, John St N, Catharine St N | 16 | 0.6 ha | – | – |
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| George St, Hess St S, King St W | 15 | 0.6 ha | – | – |
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| James St N, 16--20 Cannon St E, Cannon St E | 15 | 0.4 ha | – | – |
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| Caroline St S, Charlton Ave W | 15 | 0.6 ha | – | – |
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| Duke St, Caroline St S, Robinson St | 15 | 0.6 ha | – | – |
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| Elgin St, Mary St | 11 | 0.5 ha | – | – |
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| John St N, Murray St E | 10 | 0.4 ha | – | – |
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| Spring St, Wellington St S, Jackson St E | 8 | 0.5 ha | – | – |
|---|
Toronto
| Area | Buildings | Size | Built (median) | Next to a district |
|---|
| Queen St E, Ashby Pl, King St E | 58 | 1.6 ha | 1886 | – |
|---|
| Bright St, St Paul St, Queen St E | 56 | 1.7 ha | 1889 | – |
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| Belmont St, Roden Pl | 56 | 0.9 ha | 1887 | – |
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| Collier St, Park Rd | 53 | 1.2 ha | 1891 | – |
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| Queen St W, Euclid Ave | 52 | 1.8 ha | 1889 | – |
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| Wilkins Ave, King St E | 32 | 0.6 ha | 1889 | – |
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| Monteith St, Gloucester St, Church St | 32 | 1.1 ha | 1887 | – |
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| Beaconsfield Ave | 32 | 1.0 ha | 1887 | – |
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| Queen St W, A Queen St W | 29 | 1.1 ha | 1889 | Yes (5) |
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| Roncesvalles Ave | 27 | 0.8 ha | 1903 | – |
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| Mount Pleasant Rd | 27 | 0.7 ha | 1928 | – |
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| Berkeley St, King St E, Adelaide St E | 26 | 0.4 ha | 1872 | Yes (17) |
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| Mackenzie Cres, Afton Ave | 23 | 0.8 ha | 1890 | – |
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| Langemark Ave | 22 | 0.4 ha | 1890 | – |
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| Macpherson Ave | 20 | 0.5 ha | 1887 | – |
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| Danforth Ave | 19 | 0.5 ha | 1919 | – |
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| Queen St W | 19 | 0.6 ha | 1889 | – |
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| Percy St, King St E | 17 | 0.4 ha | 1885 | – |
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| Phoebe St | 16 | 0.4 ha | 1882 | – |
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| Trinity St, King St E, Gilead Pl | 16 | 0.8 ha | 1887 | – |
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| Queen St E | 16 | 0.5 ha | 1903 | – |
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| Beaconsfield Ave | 15 | 0.5 ha | 1884 | – |
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| Niagara St | 15 | 0.3 ha | 1890 | – |
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| Danforth Ave | 15 | 0.3 ha | 1919 | – |
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Clusters of at least 15 at-risk listed buildings, each within 45 m of the next; a starting point for local knowledge, not an evaluation. A candidate next to an existing district may suit an extension. Updated weekly.