Confirm the property information
Start with an up-to-date survey and the information available for the property. Boundaries, easements, existing structures and planning controls can affect where a secondary dwelling may be considered. A concept drawn before these constraints are understood may need substantial revision.
Approval pathways and requirements depend on the property and current rules. Obtain project-specific planning advice rather than assuming that an example from another site will apply.
Map access and working space
Consider how people, materials and equipment would reach the proposed work area. Side access, driveway width, overhead restrictions, neighbouring structures and the location of the existing home all influence construction planning.
- Measure gates and narrow passages.
- Note steps, retaining walls and fragile surfaces.
- Identify where deliveries and waste removal could occur.
- Consider how the main home remains safe and usable during work.
Review levels and drainage
A sloping site can affect floor levels, excavation, retaining, accessible paths and stormwater planning. Observe where water moves during rain and record low points, existing pits and downpipes. These observations do not replace engineering or hydraulic advice, but they help the design team ask the right questions early.
Locate services, trees and existing structures
Record visible service locations, meters, inspection points, large trees, sheds, pools and retaining walls. Service capacity and connection routes need professional confirmation. Trees may also require arborist or planning input before their influence on the design is understood.
Test privacy, daylight and orientation
Look beyond whether the building fits. Consider windows, private open space, outlook, overshadowing, noise and the relationship between the main home and the proposed dwelling. A slightly different position or room arrangement can improve everyday privacy and comfort.
Bring the findings into the design brief
Photograph and list the constraints, then provide them with the survey and property information to the designer and builder. Mark what is confirmed and what still requires advice. This produces a more useful starting brief and reduces the risk of treating assumptions as facts.
