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London ARU guide

ARU Loan London Ontario: Compare The Funding Paths Before You Build

London homeowners need to compare more than one ARU funding path. The City describes several construction grants and a separate repayable loan, and each can change the project plan. This guide separates the funding options, timing rules, rent-cap implications and address-specific checks before money is spent.

Reviewed 2026-07-20 · Independent information, not City approval

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Decision guide

Check the property before you spend on plans

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

  • Check the address
  • Compare funding agreements
  • Confirm the rent math
  • Budget the hidden costs

Loan, Grant, Or Affordable Grant - Start With The Right Path

Searchers often use one phrase, but the City incentive page now points to several ARU funding paths. These include construction grants and a separate repayable Additional Residential Unit Loan. Before relying on a number, confirm which program applies to the property, unit type, rent plan and timeline. The London ARU grant guide compares the current paths in more detail.

The funding label matters because repayment, grant-compliance terms, rent caps, liens, owner-occupancy and timing rules can differ by stream.

The Early Screens That Usually Decide Whether Funding Is Realistic

A property can look like a good backyard-suite candidate and still fail a funding assumption. Screen the major program rules before you treat a loan or grant as part of the budget.

  • Which ARU type is being created: basement, interior conversion, addition, garage conversion, or detached backyard unit
  • Whether the main dwelling must be owner-occupied for the chosen path
  • Whether the unit needs an annual Residential Rental Unit Licence
  • Whether the ARU can meet the no short-term-rental requirement
  • Whether the application needs approval before work begins
  • Which approval, construction, licensing and payment milestones apply
  • Whether the path has a rent cap, minimum rental period, lien, repayment schedule or grant-compliance term

The Timing Rule Can Matter More Than The Dollar Amount

Funding that arrives after construction is not the same as cash available before construction. Homeowners still need to plan deposits, drawings, engineering, permits, servicing, construction progress payments, contingency, and closing gaps while the project is underway.

Do not sign a contractor commitment assuming the City money will cover the early cash need. Confirm timing first.

If You Choose An Affordable Stream, Model The Rent Cap First

Some funding paths may be available at any rent, while affordable streams can tie the project to CMHC Average Market Rent for a required period. That can be fine, but only if the numbers still work after vacancy, maintenance, insurance, taxes, financing, utilities, and repairs. Use the CMHC rent cap calculator before choosing the funding path.

Funding Does Not Make The Property Buildable

Funding does not override zoning, setbacks, lot coverage, parking, services, drainage, trees, permit review, or rental licensing. The first useful move is an address-based check that compares the property against zoning, cost, and permit risk.

  • Confirm zoning and detached ARU placement before choosing a model
  • Map servicing paths before comparing contractor quotes
  • Check permit and rental-licence requirements before occupancy assumptions
  • Review development charge treatment and property-tax reassessment before final budget decisions

Best Next Step For A Homeowner

Do the funding check and the property check together. If the property can support an ARU but the funding rules do not match the plan, the project may need a different unit type, rent assumption, financing path, or timeline.

The goal is not just to find funding. It is to find a buildable, fundable, rentable, and compliant project path.

Check Zoning First Check The Rent Cap Math Review The Cost Guide

Side-by-side

How The Funding Labels Differ

The words look similar in search results, but the project consequences are different enough to matter before you commit to the lot or the design.

What to compare
Search phrase
Project reality
Loan
Usually signals a repayable support path
Check timing, repayment, and whether the funding arrives before or after construction.
Grant
Usually implies non-repayable support
Confirm the program terms before assuming it lowers cost without strings attached.
Construction grant
Conditional on the applicable agreement and compliant term
Track owner-occupancy, rent caps, licence rules, liens and discharge conditions.
Next step
Still unsure which path fits?
Compare the property against zoning, rent cap math, and cost before picking a funding path.

This is a screening tool, not a final program determination.

FAQ

Common questions, answered plainly

Is there an ARU loan in London, Ontario?

Yes. The City describes a repayable Additional Residential Unit Loan alongside separate ARU construction grants. Confirm the current stream, eligibility, timing, payment and commitment rules with City staff before relying on funding.

Can I stack London ARU funding programs?

The City incentive page indicates some ARU funding programs may be stackable, but homeowners should confirm current program rules directly with City staff because eligibility, timing, and available funding can change.

Does the ARU loan apply to any type of ARU?

The City describes an Additional Residential Unit Loan for new ARUs, while some grant or affordable-grant paths are tied to specific ARU types or affordability conditions. The right answer depends on the unit type, property, rent plan, and current program terms.

Should I apply before starting construction?

Yes. Treat pre-approval timing as a critical screen. The City incentive page says ARU funding applications should be approved before work begins.

Check The Loan Path Before You Spend

Run the London Backyard Audit to screen the property, funding assumptions, rent-cap risk, and next-step questions before drawings or deposits.

Start The London Backyard Audit

Next checks

01 London ARU Zoning Rules Check zoning, setbacks, lot coverage, and detached ARU placement rules. 02 CMHC Rent Cap Calculator Model the 1-bedroom and 2-bedroom rent caps before relying on the loan. 03 Cost To Build A Detached ARU Review construction, servicing, permit, insurance, tax, and development charge risks. 04 ARU Contractor Checklist Prepare for contractor quotes with zoning, servicing, cost, permit, and loan questions. 05 London ARU Grant Guide Compare the current grants and separate repayable loan before you spend on drawings.