Building a laneway or garden suite can be a fantastic way to maximize the use of your property, provide multigenerational living space, or generate rental income. Deciding whether to build a single storey or a two storey suite involves weighing various factors. When you start work with us, we will often design both configurations, and show you the associated construction cost, so you have the details needed to make an informed decision.
Cost & Time
One of the most important considerations for homeowners building laneway or garden suites is cost and time. In general, we find that single storey suites cost less and can be built much quicker when compared to two storey suites. A large reason for this is because they tend to be less complicated structurally and are generally easier to construct. Keep in mind a single storey suite will likely have a higher cost per square foot, but lower overall cost. For more information on this, refer to our blog titled, “The Dynamics of Laneway & Garden Suite Pricing”.
Accessibility
Accessibility is another crucial consideration for many homeowners, especially if the suite is intended for elderly family members or individuals with mobility issues. A single storey suite provides easy access for individuals with limited mobility and offers future-proofing for current residents who may face mobility challenges in the future.
Shadowing Impacts
Another important consideration when building a backyard suite is shadowing impacts. Two-storey suites can potentially block sunlight for both the primary residence and neighboring homes, depending on their positioning and height, while one-storey suites typically allow for more sunlight in the yard between the main house and the suite.
Privacy Considerations
Privacy is an important consideration for the occupants of the main house, occupants of the suite, and the surrounding neighbours. A two storey suite can have a greater impact on privacy because they may have windows and balconies that can infringe on the privacy of nearby homes and outdoor spaces. On the other hand, single storey suites tend to be less intrusive, as they do not overlook adjacent properties.
Rear Yard Depth
The depth of your rear yard is another crucial factor to consider when deciding between a single storey or two storey suite. Two storey suites typically require a greater separation distance from the main house than single storey suites, which could make them less practical for shallower yards. In fact, there are situations where a single storey suite may allow for a larger build than a two storey suite.
Angular Plane Restrictions
For properties with smaller lots, angular plane regulations (which limit the second floor massing of suites to preserve light and privacy) can make a two storey suite impractical. This is particularly true for garden suites, which are subject to angular planes on all four sides of the building. Angular plane regulations reduce the usable floor space on the second floor, complicate construction, and increase costs. On small lots, angular planes can potentially render the second floor of a suite unusable.
Building Size Restrictions
Another consideration when determining what you can build is the relative size of the suite compared to the main house. Suites cannot have an interior area that is larger than the gross floor area of the main house. If your main house has a small footprint, a two storey suite with a reasonable floorplate may not be permissible. Keep in mind the basement of the main house is typically excluded from the gross floor area calculation, which can further limit the allowable size of a laneway or garden suite.
Conclusion
Deciding between a single storey and a two storey laneway or garden suite involves balancing various factors, including cost, accessibility, shadowing impacts, privacy, yard depth, angular plane restrictions, and size limitations. Understanding these considerations can help you make a well-informed decision that meets your needs and complies with the zoning by-laws.
Our clients are not always sure which approach is best when they start work with us. We will show both configurations, and the associated construction cost so you can see for yourself how many storeys is ideal. Whether you opt for a single storey suite for its cost-effectiveness and accessibility or a two storey suite for its potential to maximize living space, we can help you craft a suite that meets your needs.
If you or someone you know is interested in building a laneway or garden suite, please follow this link to receive your complimentary report. Our team will respond with a complete review within a single business day.