Build, Invest & Grow

Additional Dwelling Unit and Multi-Plex Housing Incentive Program

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Housing Sustainability and Investment Roadmap

Download the HSIR November 2023 Update(PDF, 2.54 MB)

Contact Us

Justin Lewis, Director
Email [email protected]

The Additional Dwelling Unit and Multi-Plex Housing Incentive Program(PDF, 219.1 KB) is intended to provide a financial incentive to help offset eligible costs related to the creation of Additional Dwelling Units or Garden Suites within, or on the same property as, new or existing low-density houses or the creation of multi-plex developments with six (6) or fewer Dwelling Units. As of October 9th, 2025, the grant value and requirements were amended by the Housing Sustainability Investment Roadmap (HSIR) Executive Committee.

The value of the Grant is 70% of Eligible Costs, to a maximum of $40,000 per Eligible Unit(s). The Grant is structured in two payments:

The first advance is 20% of the total estimated grant amount, to a maximum of $8,000 per Eligible Unit(s). Due to the timing of this payment, the first advance is calculated using a contractor’s estimate for total Eligible Costs (20% of 70% of estimated Eligible Costs).
The second advance will be calculated based on actual Eligible Costs incurred and is payable upon occupancy permit issuance. This advance is up to 70% of Eligible Costs incurred, less the amount of the first advance.
In all cases, the total Grant provided, the sum of both advances, will not exceed $40,000, per eligible unit.

Current Introduction & Application Pre-questions
Applicant Information
Program, Site & Building Information
Project Information
Acknowledgements & Declarations
Review Application
Complete

Before applying, it is essential that you read the Additional Dwelling Unit (ADU) and Multi-Plex Housing Incentive Program Guidelines(PDF, 219.1 KB). The Program Guidelines provide an outline of all important information regarding Minimum Application Submission Requirements, Minimum Program Eligibility, Criteria, Eligible Costs, Process, and Timelines.

Please ensure that all of the required information and submission materials listed below are provided to ensure it is a Complete Application:

Copy of Building Permit plans approved by the Chief Building Official
Detailed Estimate of Total and Eligible Costs
Current Pictures of Proposed Building Area
Copy of most recent Mortgage Statement and verification that payments are current and up to date
Copy of most recent City of Hamilton Tax Statement of Account with Transaction History (even if exempt)

Additional Submission Requirements for an Exterior ADU or Multiplex:

Detailed Site Plan with Building Dimensions and Setbacks

Application progress cannot be saved. Please ensure you have all your documents and information ready before starting the application.

Incomplete applications will not be processed.

Application Pre-questions

Is the Site within the HHCIPA Sub Area 2 - Roxborough?

For a property (“Site”) to be eligible for this Program, the site must not be located within the HHCIPA Sub Area 2 – Roxborough (Reference By-law No. 24-024, Report 24-002 (PED23143(c))

Yes - Site is within HHCIPA Sub Area 2 - Roxborough

NO - Site is not within HHCIPA Sub Area 2 - Roxborough

Sites located within the HHCIP Sub Area 2 are not eligible for Additional Dwelling Unit and Multi-Plex Housing Incentive Program.

Please review the Housing for Hamilton CIP (2024) section at Community Improvement Plans and Financial Incentives.

For more information on the financial incentive programs available to sites within the HHCIP Sub Area 2, contact:
Housing Services Division
Healthy and Safe Communities Department
Call 905-546-2424

Close Application and Return to Housing Accelerator Fund page

Notice of Collection

Personal information, as defined by the Municipal Freedom of Information and Protection of Privacy Act, R.S.O. 1990, c.M.56, as amended, contained on this form or on any additional attachments submitted is collected in accordance with Zoning By-law No. 05-200, as amended, and under authority of Section 227 of the Municipal Act, 2001, S.O. 2001, c. 25 as amended for the purpose of determining initial and ongoing eligibility for the Housing Accelerator Fund Additional Dwelling Unit & Multi-Plex Housing Incentive Program. Personal information will be de-identified and aggregated for program planning, and statistical and reporting purposes. Personal information will also be shared with municipal, provincial or federal governments to satisfy program reporting requests and requirements, to determine eligibility during the program period, and may be used for other purposes allowed by law. By providing your email address, you are consenting to receiving emails from the City of Hamilton and/or their agents/contractors for program administration, quality assurance and communication regarding program eligibility, conditional offers, forgivable loan agreements, and the progression and compliance with the program. Any questions regarding the collection or release of this information should be directed to:

Housing Secretariat Division
Healthy and Safe Communities Department
City of Hamilton
Email [email protected]
28 James Street North, 5th floor
Hamilton ON
L8R 2K3

Date modified

March 11, 2026