A Retrofitted ADU is the most cost-effective way to create an additional dwelling unit within your existing home. Instead of building an entirely new structure, a retrofitted ADU repurposes and reconfigures part of your home by adding walls, locks, and potentially a separate entrance. This method allows homeowners to maximize their living space without expanding the footprint of the house.

A retrofitted ADU is a secondary living space created within the existing structure of a home. Unlike basement or garage conversions, which transform a specific area into a unit, retrofitting focuses on dividing an existing living space to function as two separate units.

Example: If you have a large single-family home with an unused formal dining room and a second living room, you can convert part of the space into a small rental unit by installing a kitchenette, adding a private entrance, and modifying walls to create a self-contained living space. This approach is particularly useful in homes with multiple floors, where an upper or lower level can be separated with its own entrance.

Creating a retrofitted ADU involves several key modifications depending on your existing home layout. Some common approaches include:

Dividing the House into Two Separate Units

• Install partition walls to create separate living areas.
• Add locking interior doors to ensure privacy.
• Modify HVAC and electrical systems for independent controls if necessary.

Creating a Private Entrance

• Convert an existing side door, back door, or basement walkout into a dedicated ADU entrance.
• Build an external staircase for second-floor ADUs.
• Add an interior staircase separation to create distinct units.

Installing a Kitchenette and Bathroom

• Small kitchenettes can be fitted with compact appliances to maximize space.
• Bathrooms may share plumbing with the main house but should have private access.

Ensuring Fire Safety and Compliance

• Install proper fire separation walls and smoke detectors.
• Ensure each unit has an egress window or exterior exit for emergency access.
• Meet Ontario Building Code regulations for secondary units.

This is simply a general guide of some of the things which may be required to get your home an ADU. Contact us to get a better understanding of the requirements for your specific home!

Retrofit/Renovated ADU conversions must adhere to specific Ontario Building Code and zoning regulations to ensure safety and habitability. Some key requirements include:

• Zoning Bylaws – Some municipalities require permits to create secondary units.
• Fire and Safety Codes – Must include proper fire separation and egress windows.
• Utility and HVAC Adjustments – Some homes may require separate metering or modifications for adequate ventilation.
• Permitting and Inspections – Local approval may be required before renting the unit.

Our team at Windsor ADU’s will navigate all of these regulations for you, ensuring your renovated ADU conversion meets all legal and safety requirements.

A retrofitted/renovated house that adds an ADU offers a range of financial, functional, and lifestyle benefits, making it one of the most practical ways to enhance your property:

• Most Cost-Effective ADU Option – Since it requires minimal new construction, a retrofitted ADU is significantly cheaper than building an addition or converting an outbuilding.
• Quick Implementation – Projects can be completed in weeks rather than months.
• Flexible Usage – Ideal for long-term rentals, in-law suites, home offices, or short-term Airbnb rentals.
• Minimal Impact on the Existing Home – No need for major exterior renovations or structural modifications.

Thinking about adding an ADU into your existing home? Windsor ADU’s will guide you through the entire process—from feasibility studies and zoning approvals to construction and final inspections. Contact us today to turn your house into an additional living space!