Zoning Requirements: Before constructing a garage granny flat, it is essential to check local zoning requirements. Some areas may have restrictions on the size, location, and use of ADUs. In some cases, a special permit or variance may be required.
Foundation and Structural Support: Since a garage granny flat is built on top of an existing garage, it is crucial to ensure that the garage is structurally sound and able to support the additional living space. The foundation of the garage may need to be reinforced or upgraded to accommodate the extra weight.
Design Considerations: The design of the garage granny flat should complement the existing home and the surrounding neighborhood. It should also meet the specific needs of the occupant, taking into account features such as accessibility, safety, and privacy.
Utilities and Services: A garage granny flat will need to be connected to the main house for water, sewer, and electricity. The civil engineer will need to assess the current infrastructure and determine if any upgrades are needed to support the additional unit.
Parking and Access: The addition of a garage granny flat may impact parking and access for the main house. The civil engineer will need to ensure that there is sufficient parking space and safe access to both the main house and the new unit.
Stormwater Management: The design of a garage granny flat should include proper stormwater management to prevent damage to the property and surrounding areas. This may involve installing drainage systems, grading, and directing runoff away from the main house.
Construction Phasing: If the garage granny flat is being built as an extension of the garage, the construction phases should be carefully planned to minimize disruption to the main house. This may require coordination between different contractors and careful timing of activities.