A single-story back expansion with a maximum height of four metres is permitted. Extensions of more than one floor must not extend more than three metres beyond the existing house's back wall. The eaves height of an expansion within two metres of the border is limited to three metres. If the extension is less than two metres from the border, then it can be any height up to five metres.
If you want to build an extension that gets its own plot, you need to apply for planning permission. You cannot just build anything you like on your property; the law aims to preserve houses by allowing only certain types of building. If you want to extend your house by adding another floor, here's what you need to know.
You should consult with an architect or engineer to make sure your extension is suitable for your needs and meets with local council regulations. Only then can you start work on your project.
The important thing is that you do enough research about extensions to avoid making mistakes that could lead to problems with your house later on. Follow these steps to ensure you get planning permission and don't hurt yourself or your house along the way.
Start small. It's better to extend your house in phases so you don't run into problems when you go to add another floor later on. Consider what type of space you need and how you can use that space most effectively.
To be approved development, the maximum eaves height shall be no greater than 3m if the addition is within 2m of a boundary. 9. Single-story back expansions shall not exceed 4 m beyond the original home's rear wall* if it is a detached house, or 3 m if it is any other dwelling. 10. Multi-family dwellings with more than four units will require a building permit for each additional floor.
* This measurement is from front to back, along the exterior of the house. If you are adding space inside the house, such as an extra bedroom, then you will need to allow enough space for a bathroom and a kitchen (or other living areas) too.
Building permits only cover the actual construction process. Once your extension is complete, you will need to get building regulations approval from your local council. They will check that all safety requirements have been met and give permission for you to live in your extended house.
Building permits cost between $150 and $200, depending on the size of the project. It is best to call your local building department to find out how much they charge per build.
Extensions can be done in many different ways, but the most common method is to use screws to attach the new roof boards to the existing ones. The new boards should be long enough to reach the end of the extension without hitting the roof edge.
For single-story additions, Single-story rear expansions cannot extend more than four metres beyond the original home's back wall* if it is a detached house, or more than three metres for any other property. The building regulations also restrict how close you can place a new dwelling next to an existing one. * If you want to know how far you can extend your house, see what size room you can add below.
Double-story rear expansions can be up to five and a half meters long if the floor plans are similar on both levels. These sizes are limited only by local regulation. In some cases, it may be possible to increase this limit by applying to have the building inspected by a structural engineer who will determine whether or not it is safe for your house to remain standing after extension.
Triple-story rear expansions can be as much as nine meters long if the floor plans are similar on all floors. Again, these lengths are limited only by local regulation.
Quadruple-story rear expansions can be as much as thirteen and a half meters long if the floor plans are similar on all floors. These lengths are limited only by local regulation.
Extensions of more than one storey are not permitted to extend more than three metres beyond the existing house's back wall. Side additions are single-story and no wider than half the width of the original home. Two-story expansions are not permitted to be built closer than seven metres to the back border. If you want to build a second story, you'll need to move farther away from the property line.
As long as you follow these rules, an extension is allowable multiple times under Ontario law. The extent of your legal right to build again will depend on how far you stretch out into your yard and what kind of construction you do. For example, if you extend your house with a garage, you have the right to do so twice more because each time you extend your house, you get another building permit opportunity.
The most common type of addition is called a "one-carriage-house". This adds a single room to the back of the property. Because they're small, one-carriage-houses aren't required to have their own separate heating or cooling system. However, if you add other features like a kitchen or bathroom, then you have a right to do so again.
A full service bathroom includes a toilet, a bathtub, a shower, and usually a window that opens. A half-bathroom has just a toilet or a shower but no bathtub.