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London ARU guide

Converting a Detached Garage into an Apartment in London

A detached garage conversion can save some structural work, but it is still a dwelling conversion. The existing footprint has to meet zoning and building-code expectations for structure, insulation, fire safety, egress, plumbing, heating, ventilation, and permits.

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Decision guide

Check the property before you spend on plans

Use the lot, loan, rent-cap, and servicing screens to decide whether the next step should be design work, a builder conversation, or more research.

  • Check the address
  • Review the loan rules
  • Confirm the rent math
  • Budget the hidden costs

Using Existing Footprints

Converting an existing garage may avoid a new foundation pour, but the structure still has to be suitable for residential use. Slab condition, frost protection, walls, roof framing, insulation, ceiling height, moisture control, windows, and fire separation all need review. If the existing garage sits close to a lot line, compare the setback guide before assuming the footprint is automatically usable.

The cheapest-looking conversion can become expensive if the existing structure was never built to dwelling standards.

Upgrading Services

Most detached garages were not built with full plumbing, sanitary service, dedicated heating, ventilation, or dwelling-level electrical capacity. Budget for licensed professionals to review sanitary routing, water service, electrical capacity, HVAC, ventilation, and insulation before treating the garage shell as a finished apartment.

  • Confirm plumbing and sanitary routes before finalizing layout.
  • Review independent heating, ventilation, and electrical needs.
  • Plan for fire safety, smoke and carbon monoxide alarms, and inspections.

FAQ

Common questions, answered plainly

Is converting a detached garage cheaper than building a new ARU?

Sometimes, but not always. The existing structure may still need major upgrades for structure, insulation, plumbing, HVAC, fire safety, egress, and permits.

Can I rent a converted garage before inspections are complete?

A legal rental unit should have the required permits, inspections, and rental licensing in place before occupancy.

Test The Garage Conversion Path

Run the audit to flag whether the existing structure and lot are likely to create zoning, servicing, or permit friction.

Run The ARU Audit

Next checks

01 London ARU Zoning Rules Check zoning, setbacks, lot coverage, and detached ARU placement rules. 02 ARU Loan Funding Paths Compare London's ARU loan, grant, rent-cap, timing, and cash-flow screens. 03 CMHC Rent Cap Calculator Model the 1-bedroom and 2-bedroom rent caps before relying on the loan. 04 Cost To Build A Detached ARU Review construction, servicing, permit, insurance, tax, and development charge risks. 05 ARU Contractor Checklist Prepare for contractor quotes with zoning, servicing, cost, permit, and loan questions. 06 CMHC ARU Plan Guide Compare catalogue plans before choosing a design direction. 07 London ARU Grant Guide Review the forgivable-loan screens before you spend on drawings. 08 Granny Suite Planning Plan a family backyard suite while checking ARU rules, permits, and funding limits.