@Tony Mbuthia i just wrote a blog about this topic. Here it is below. Hope it helps:
A garage conversion can be a cost-effective way to add living space to a property and potentially generate income through renting the garage apartment (or living in it and renting out the main house). Here are some considerations for making a garage conversion into a good apartment:
1. Local Permitting: you'll want to check with your building department to see if a conversion like this is allowed in the current zoning of your home. You don't want to spend all the money to convert a garage just to have it be illegal.
2. Structural integrity: One of the most important considerations is the structural integrity of the garage. If the garage is not built to support the weight of additional floors or is not adequately reinforced, it may not be suitable for conversion.
3. Insulation: Another important consideration is insulation. A garage that is not properly insulated may be uncomfortable to live in and may not meet local building codes for habitation.
4. Heating and cooling: In order to make the garage comfortable to live in, you will need to install heating and cooling systems. This may involve adding ductwork, installing a separate HVAC unit, or using portable heating and cooling units.
5. Electrical: Another important consideration is the electrical and plumbing systems. You will need to install outlets, switches, and lighting fixtures as needed,
6. Plumbing: You will almost certainly need to connect all drains to the sewer and bring in water lines.
7. Windows and doors: To provide natural light and ventilation, you will need to add windows and doors to the garage. This may involve cutting through the exterior walls and installing new openings.
8. Shower: To add a shower, you will need to install a drain in the floor of the garage and run plumbing lines to the location of the shower. You will also need to install a shower pan, a shower enclosure, and a showerhead.
9. Kitchenette: To add a kitchenette, you will need to install plumbing lines to the location of the sink and any appliances you plan to include, such as a mini-fridge or microwave. You will also need to install cabinetry and countertops, and you may want to consider adding a small stove or oven if you plan to do more extensive cooking in the space.
10. Finishes: Finally, you will need to finish the interior of the garage to make it suitable for habitation. This may involve installing drywall, flooring, and ceiling materials, as well as painting and decorating to your taste.
A garage conversion can be a cost-effective way to add living space and potentially generate income but it is important to consider all the factors mentioned above.
I've done two garage conversion. One single car garage (240 sq ft) for $17,000 in three months. One two car garage for $27,000 in four months. I hired a handyman and was the GC for the project.
