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London ARU Development Charges: What Homeowners Should Check Early

Development charges can be one of the largest hidden costs in a London ARU project. Some detached ARU setups may qualify for favourable treatment, but exemption eligibility is conditional and confirmed through the City permit process, not assumed from a sales page or builder estimate.

Run The Backyard Audit
Decision guide

Protect the budget from the DC trap

Development charges can be one of the largest hidden costs. Confirm the likely exemption path early, then let the City confirm the result through the permit process.

  • Check existing unit count
  • Confirm 'additional unit' status
  • Get City confirmation

Why Development Charges Matter In ARU Budgeting

Development charges are municipal fees tied to growth-related infrastructure. Because a detached ARU adds a new dwelling unit, homeowners need to understand whether the project may trigger a charge or fit one of the City’s exemption pathways.

The Cost Risk Can Be Large Enough To Change The Project

According to the 2026 Development Charges schedule, the rate for a new single or semi-detached unit inside the Urban Growth Area is $50,564. For apartments with 2+ bedrooms, it is $30,306. Numbers at this level can materially change whether the project still works after financing, servicing, and capped rent are considered.

Inside the Urban Growth Area, a single DC can be over $50,000.

Some ARU Setups May Qualify For Exemption Treatment

The City of London provides exemption pathways for some additional unit combinations on residential lots, including some detached ARU situations. The key point is that exemption treatment depends on the exact building type, unit count, and permit facts, so homeowners should treat it as a review item until the City confirms it.

  • Exemptions may exist for units in existing residential buildings.
  • Detached ARU exemptions may apply on some residential lots.
  • Eligibility depends on the exact unit combination and project facts.
  • The City confirms development charge treatment during permit review.

Do Not Treat Exemption As Automatic

Do not assume your project is exempt based on a blog post or a builder's estimate. The City of London Building Services team is the authority that confirms development charge treatment during the permit process. Pair this review with the cost guide and loan guide so the budget is tested against both fees and funding rules.

FAQ

Common questions, answered plainly

How much are development charges in London, ON for 2026?

For 2026, the standard DC for a single-detached home inside the Urban Growth Area is $50,564. For 2+ bedroom apartments (which many detached ARUs are classified as), the rate is $30,306.

Are detached ARUs exempt from development charges?

Some detached ARU situations may qualify for exemption treatment, but it is not automatic. The City offers exemptions for some 'additional' unit combinations on residential lots, and Building Services confirms eligibility during the permit stage.

Screen The Property Before You Assume A DC Exemption

The Backyard Audit helps flag whether DC treatment deserves early attention before you rely on a builder quote or a $45,000 forgivable-loan plan.

Run The 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 CMHC ARU Plan Guide Compare catalogue plans before choosing a design direction. 05 London ARU Grant Guide Review the forgivable-loan screens before you spend on drawings.