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Multiplex Development

Turn existing single-family homes or vacant properties into multiple self-contained residential units to maximize your property's potential. Whether through interior conversions, adding storeys (top-ups), extending the footprint, or building entirely new structures from the ground up, ASE+J Inc. provides comprehensive architectural design, zoning compliance, and permit solutions for multiplex projects across Ontario.

How Many Units Can I Build On My Property?

Up to four units are permitted as-of-right on any residential lot city-wide. Up to six units are permitted as-of-right if your property is located in one of the designated sixplex wards (including eight wards in the Toronto and East York district plus Ward 23, Scarborough North). Everywhere else remains capped at four.

Do I Need To Rezone Or Get A Variance To Build A Multiplex?

No, in most cases. A compliant multiplex needs no rezoning, no Official Plan amendment, and no public meeting. It goes straight to a building permit. A variance is only needed if your plans exceed standard zoning limits such as height, setbacks, or lot coverage.

How Many Parking Spaces Do I Need For A Multiplex?

Municipalities like Toronto have relaxed parking requirements for multiplexes as part of zoning updates, reflecting a broader push toward transit-oriented, walkable development. Parking is often not the limiting factor it once was; lot width, depth, and servicing tend to matter more.

Are Development Charges Waived For Multiplexes?

The short answer is yes. Municipalities have steadily been removing development charges from small-scale housing. All units up to a fourplex have been exempt from development charges for years, and exemptions have further expanded to cover units up to a sixplex.

Can I Get Financing For A Multiplex Conversion?

Yes. Programs such as CMHC’s MLI Select offer high loan-to-value financing and extended amortization for purpose-built rental properties and multi-unit conversions (including added laneway or garden suites).

How Long Does A Multiplex Conversion Take?

It depends on the scope of the specific project. Factors like unit count, whether it is a conversion or a new build, and municipal permit processing complexity all affect the overall timeline.

Can I Convert My Existing House Into A Multiplex, Or Do I Need To Rebuild?

Yes, conversions of existing houses are very common. However, the existing structure must be strong enough to support the new layout. In some situations, if retrofitting costs are too high, it may be more cost-effective to build a new structure entirely.

Note that “Pre-design” and “Post-construction” services are additional services and are therefore not included in the list.

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