This page summarizes Oshawa permit information. Use the official city links for the current rules on your address and project.
Oshawa’s published permit rules, in plain English:
Oshawa lists finished basements, dwelling units, decks or porches, heating or plumbing changes and larger sheds among projects that require building permits.
The city also publishes specific examples of work that does not require a permit, such as certain low uncovered decks for houses.
For houses, an uncovered deck 600 mm (24 in) high or less can be permit-exempt; same-size window/door replacement can also be exempt.
Basement work such as moving plumbing, adding/removing walls, adding a bathroom or enlarging windows/doors normally requires a permit, while flooring, cabinets with no plumbing changes and same-size window/door replacement are listed as no-permit examples.
Oshawa publishes project-specific guides for basements, decks, sheds/garages and other permit applications.
Oshawa uses Ontario's provincial building-code framework. See the Ontario permit overview for province-wide context; this page focuses on Oshawa's municipal process and property-specific approvals.
Key items named by the municipal source:
Choose a project below. “Dedicated municipal source” opens a project-specific city page; “Municipal permit hub” opens the broader official permit source.
Oshawa lists sundecks, decks and porches as permit projects. A deck 600 mm (24 in) high or less with no roof is listed as a no-building-permit example for houses.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Oshawa requires a building permit for a shed larger than 15 m² (161 sq ft).
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Finishing a basement is specifically listed as a project requiring a building permit in Oshawa.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Adding a dwelling unit/apartment requires a building permit, and Oshawa also coordinates registration of newly created two-unit houses.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →For an addition in Oshawa, expect the municipality to review the added floor area or footprint along with zoning, site conditions, drawings and structural design. Use the local source before paying for final plans.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Basement work such as moving plumbing, adding/removing walls, adding a bathroom or enlarging windows/doors normally requires a permit, while flooring, cabinets with no plumbing changes and same-size window/door replacement are listed as no-permit examples.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →For houses, an uncovered deck 600 mm (24 in) high or less can be permit-exempt; same-size window/door replacement can also be exempt.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →For a pool or hot tub in Oshawa, check more than the pool itself: enclosure/fence, zoning, grading, setbacks and site-alteration approvals may have separate rules.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Oshawa publishes project-specific guides for basements, decks, sheds/garages and other permit applications.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →Changes to heating or plumbing systems are listed among Oshawa permit projects.
Open Oshawa’s municipal permit hub ↗Read the general Canada planning guide →0 project cards use a verified dedicated municipal/project source; 10 use the municipality’s broader official permit source.
Source-label rule: “Dedicated municipal source” means we verified a project-specific Oshawa page. “Municipal permit hub” means the municipality publishes the answer through a broader permit page or portal. We do not invent a project URL.
Primary authority: Oshawa’s official municipal permit information. Project links are labelled by source depth.
Oshawa uses Ontario's provincial building-code framework. See the Ontario permit overview for province-wide context; this page focuses on Oshawa's municipal process and property-specific approvals.
Open primary Oshawa source ↗How Home Permits Canada fact-checks pages →Use these Oshawa municipal links before you spend money on final drawings, materials or construction. They are the authority for the current local process.
Oshawa sources checked September 13, 2026. Use the linked municipal pages for current forms, fees and rules; Home Permits Canada is independent.
