Multiplex Conversions: One Permit, Four Kitchens

Picture a permit for a house on a quiet street. Nothing about the address says volume. Then you read the scope: four units, four kitchens, four bathrooms, four electrical panels, four heating zones, two new entrances, a fire-rated stair and a sprinkler feed. That is a multiplex conversion, and per permit it carries more trade work than almost anything else on the feed.

Why this is happening now

Cities across North America have rewritten residential zoning to allow more homes on the lots they already have. Toronto permits up to four units on most residential lots, and the Greater Toronto Area (GTA) municipalities are following at their own pace. Builders who used to flip a house into a bigger house are now turning it into a small apartment building, because the math works better and the demand is there.

What is inside the permit

A renovation touches one of everything. A fourplex conversion touches four of everything, and then adds the things a single house never needed:

• Electrical: four panels or a shared service with sub-metering, new feeds, and often a service upgrade at the street.
• Plumbing: four kitchens, four or more bathrooms, separate shutoffs, new drain runs and frequently a water service upgrade.
• HVAC: separate zones or separate systems per unit, with ventilation that meets code for each dwelling.
• Fire separation: rated walls and ceilings, rated doors, sometimes a sprinkler system, all of which pull in drywall, insulation and door suppliers.
• Finishes: four kitchens of cabinetry and counters, four sets of flooring, four bathrooms of tile and fixtures, paint throughout.

For a cabinet shop that is four kitchens from one conversation. For an electrician it is a project the size of a small commercial fit-out with a residential builder on the other end.

The timing is tight and the windows overlap

Conversions move fast because the shell already exists. Rough-in trades are settled around the time demolition finishes. Finishes are being quoted while framing for the new partitions is still going up. The stage a permit sits in tells you which package is open right now; a conversion at framing is a conversion where the kitchens and floors are being decided this month, not next quarter.

Read by builder, not by address

The builder who converts one house is a lead. The builder who has filed five conversions in two years is an account. Their units repeat, their scopes repeat, and they would rather call the same electrician five times than re-source one. Builtie's company records show which builders and owners are filing multiplex conversions repeatedly, how many units, and where. That list is short in most neighborhoods, which is what makes it worth working.

What to say

Lead with the density and the repetition. "You've got the fourplex conversion on Brock permitted. We've fitted three conversions this year with the same unit count and can price all four kitchens off the drawings this week." A builder who is turning one house into four homes needs trades who understand that a fourplex is not a big renovation, it is four small ones sharing a roof.

How Builtie fits

Set your project types to include conversions and additional units, set your territory, and the feed becomes a list of dense, fast, repeatable projects with the builder and owner identified. Starter covers up to 20 projects a month for $79 per month per seat with a 10-day free trial; Growth raises that to 50 and adds the events dashboard and social media signals. Growth includes the LinkedIn and email outreach, so the first message goes out while the permit is still fresh.

Know the projects. Reach the decision makers. See the conversions being permitted in your area at builtie.com.