Toronto address · Ward 5, York South-Weston

411 Blackthorn Ave

The City of Toronto has 10 building permits since 2017 on record for this address.

Building permits

Every permit the City lists for this address since 2017, and any still open from before, newest first.

Small residential project · Multiple projects
Interior Alteration to accomodate 3rd unit at the 2nd floor (triplex).
Applied Mar 13, 2024 · completed Apr 30, 2024 · 1 home added · Permit 24 125086 BLD
Cancelled
Heating and ventilation
REV #-1REVISE LAYOUTHVAC - Proposal for a second floor addition, interior alterations, front porch with deck above, rear deck, and second storey rear deck.
Applied Jan 7, 2022 · issued Jan 19, 2022 · completed Jun 2, 2022 · Permit 18 259833 HVA (revision 01)
Closed
Small residential project · Multiple projects
Revision: Adding windows at north elevation, revised framing and add roof hatch at rear over balcony
Applied Nov 23, 2021 · issued Dec 1, 2021 · completed Jul 27, 2022 · Permit 18 259833 BLD (revision 01)
Closed
Drains and site services · Back water valve (Sewer only)
Proposal to install back water valve.
Applied Nov 21, 2019 · issued Nov 21, 2019 · completed Jul 27, 2022 · Permit 19 251955 DRN
Closed
Heating and ventilation
HVAC - Proposal for a second floor addition, interior alterations, front porch with deck above, rear deck, and second storey rear deck.
Applied Sep 1, 2019 · issued Sep 19, 2019 · completed Jun 2, 2022 · Permit 18 259833 HVA
Closed
Small residential project · Multiple projects
Proposal for a second floor addition, interior alterations, front porch with deck above, rear deck, and second storey rear deck.
Applied Nov 22, 2018 · issued Nov 28, 2018 · completed Jul 27, 2022 · Permit 18 259833 BLD
Closed
Plumbing
Plumbing - Proposal for a second floor addition, interior alterations, front porch with deck above, rear deck, and second storey rear deck.
Applied Nov 22, 2018 · issued Nov 28, 2018 · completed Jul 27, 2022 · Permit 18 259833 PLB
Closed
Plumbing
Plumbing - Proposal to convert existing single family to two unit dwelling, underpinning, interior alterations and a new front porch.
Applied Oct 2, 2018 · issued Oct 4, 2018 · completed Jul 5, 2022 · Permit 18 235929 PLB
Closed
Drains and site services
Drain - Proposal to convert existing single family to two unit dwelling, underpinning, interior alterations and a new front porch.
Applied Oct 2, 2018 · issued Oct 4, 2018 · completed Jun 2, 2022 · Permit 18 235929 DRN
Closed
Small residential project · Multiple projects
Proposal underpinning, interior alterations, a new front porch and second suite to an existing detached dwelling..
Applied Oct 2, 2018 · issued Oct 4, 2018 · completed Jul 27, 2022 · 1 home added · Permit 18 235929 BLD
Closed

Committee of Adjustment

No applications to the City's Committee of Adjustment for this address since 2017. That's where an owner asks for a minor variance (a small exception to the zoning by-law) or a consent to divide a lot.

What’s planned nearby

Development sites within 500 m

No rezoning, site plan, subdivision or condominium file open within 500 m, and no pre-construction project on the site.

Neighbours’ Committee of Adjustment files within 250 m

14 Haverson Blvd · Minor variance
To construct a second storey addition above the existing dwelling.
210 m away · filed Jul 31, 2026 · Approved
380 Caledonia Rd · Consent
To obtain consent to sever the property into five residential lots.
230 m away · filed Jun 2, 2025 · Postponed
380 Caledonia Rd · Minor variance
To construct a three-storey detached dwelling with an integral garage, a front porch with canopy and stairs, a rear basement walkout, a rear deck with stairs and a front and rear third storey balcony.
230 m away · filed May 6, 2025 · Postponed
380 Caledonia Rd · Minor variance
To construct a three-storey detached dwelling with an integral garage, a front porch with canopy and stairs, a rear basement walkout, a rear deck with stairs and a front and rear third storey balcony.
230 m away · filed May 6, 2025 · Postponed
380 Caledonia Rd · Minor variance
To construct a three-storey detached dwelling with an integral garage, a front porch with canopy and stairs, a rear basement walkout, a rear deck with stairs and a front and rear third storey balcony.
230 m away · filed May 6, 2025 · Postponed
380 Caledonia Rd · Minor variance
To construct a three-storey detached dwelling with an integral garage, a front porch with canopy and stairs, a rear basement walkout, a rear deck with stairs and a front and rear third storey balcony.
230 m away · filed May 6, 2025 · Postponed
380 Caledonia Rd · Minor variance
To construct a three-storey detached dwelling with an integral garage, a front porch with canopy and stairs, a rear basement walkout, a rear deck with stairs and a front and rear third storey balcony.
230 m away · filed May 6, 2025 · Postponed
402 Blackthorn Ave · Minor variance
To enclose the existing rear porch.
70 m away · filed Mar 18, 2025 · Approved

Everything planned in York South-Weston

From the City of Toronto’s open data: building permits (active, and cleared since 2017), Committee of Adjustment applications and address points, this record updated Sep 29, 2026, and the development sites from its Development Applications data. Contains information licensed under the Open Government Licence – Toronto. Construction cost estimates and contractors’ names are left out on purpose, and nothing here names an owner.