A home assessment comes before a confident yes.
A second storey changes the demands placed on an existing home. The fact that a neighbour has built up, or that your home appears solid, does not establish that your proposal is suitable.
Ask an appropriately qualified structural engineer and building professional to assess the existing structure and proposed work. Depending on the home, they may need original plans, a site inspection or further investigation. An online enquiry is not a structural assessment.
Six topics for your first professional conversation.
Existing foundations and structure
What information is available about the footings, framing and previous alterations? What would need investigating before the design progresses?
The new layout
Where could the stairs go without making the ground floor awkward? How much of the floor area would circulation take up?
Roof and weather protection
What roof changes are proposed? How would the builder manage temporary protection during the works?
Services and bathrooms
Where would new bathrooms, electrical services and climate control connect? Ask whether the existing systems need review.
Site access
How would materials, equipment and trades reach the work? Share any narrow access, steep driveway or access restrictions early.
Planning and certification
What rules apply to the specific address and proposal? Do not assume a suburb name tells you the approval pathway.
Bring what you have. Do not guess what you do not.
Gather existing drawings, available approval records and a simple list of the rooms you want to add. A few exterior photos can help explain the home, but they cannot replace a site assessment.
Tell the professional about known previous extensions, structural issues or work that may not have approval records. If you do not have old plans, ask what should be obtained and who will arrange it.
Property suburb. Existing home type. Rooms needed. Budget range. Preferred timing. Available drawings. Known constraints.
Keep more than one option open.
The best result may be a full upper floor, a smaller addition or a different use of the existing space. Ask the designer and builder to compare the implications before detailed design locks in a single approach.
Read our build up or extend out guide and above garage guide for questions to take into that discussion.
Official resource: ABCB guidance on how the National Construction Code applies to home extensions.