Legal Basement Conversions in Mississauga

Turn a Mississauga basement into a legal, registered second unit — or plan an addition or renovation — with permit drawings prepared for the City's review.

GET FREE CONSULTATION CALL (437) 888-2769

The Difference Between a Finished Basement and a Legal One

Mississauga has a large stock of 1970s–1990s homes with big, high basements — ideal candidates for second units. But a basement with a kitchen and a tenant is not automatically a legal apartment. A legal second unit is one the City has permitted and inspected: proper fire separation from the main dwelling, a safe exit, adequate light and ventilation, and services designed for two households. Getting there starts with drawings, and that is what we do.

Legalizing an Existing Basement Unit

Many Mississauga homeowners already have a tenant downstairs and want to make the unit legitimate. We measure the unit as it exists, identify what meets the Ontario Building Code and what does not, and produce the drawings for a permit application that legalizes it — so you are protected as an owner and landlord.

As-Built Assessment

What your existing unit already gets right

Compliance Drawings

The changes needed to make it legal, drawn for permit

Application Support

Through the City of Mississauga's review

New Basement Apartments

Starting from an unfinished or family-use basement? We design the unit from scratch — layout, kitchen and bath locations, the separate entrance, and the fire and sound separation between the two dwellings — and deliver a complete permit drawing set for the conversion.

Unit Layout Design

Making the most of your basement's footprint

Separate Entrance Drawings

Side-door and below-grade entrance design

Full Permit Sets

Architectural drawings ready for submission

Additions & Renovations

Beyond basements, we prepare permit drawings for the projects Mississauga homeowners take on most: rear and second-storey additions, garage conversions, major interior renovations and structural changes. One designer, one drawing set, one application.

Home Additions

Extending out or up

Structural Renovations

Wall removals and open-concept conversions

Garden Suites

Detached second dwellings where lots allow

Mississauga Basement Conversion Questions

Usually the existing work is a starting point, not a write-off. We assess what is already compliant — many finished basements are closer than owners expect — and draw only the changes actually required. The honest answer for your basement comes from the assessment, which is where every legalization project begins.
A permitted, inspected unit protects the people living in it and protects you: fire separation and exits that meet the Ontario Building Code, and a unit the City recognizes. An illegal unit can expose an owner to enforcement and insurance problems; a legal one adds durable value to the property.
A free consultation. Tell us the address and what you have or what you want to build, and we will lay out the realistic path — feasibility, drawings, permit application — with a clear quote for the drawing work. Call (437) 888-2769 or use the contact form.

Make Your Mississauga Basement Legal

Start with a free assessment of what your basement needs — and get a clear, honest quote for the drawings.

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