If I rebuild my landed house with a curved frontage, is the setback measured from the inner or outer end of the curve?

I appreciate your question about landed house setbacks, but I need to clarify that I can only provide general information based on available guidelines. For a specific situation involving a curved frontage, you should consult directly with the Urban Redevelopment Authority (URA) or a qualified architect, as setback calculations for non-standard property boundaries require professional interpretation of planning rules.

Generally, setback requirements in Singapore are measured as the perpendicular distance from the building structure to the property boundary line. For a curved frontage, setbacks would typically be measured from the actual boundary line of your property at the relevant points. However, curved boundaries create complexity in how this measurement is applied, and the interpretation may depend on:

- The specific geometry and extent of the curve
- Whether the curve is part of the legal boundary recorded with the Land Authority
- The road category your property fronts
- Any specific planning conditions for your plot

The Building and Construction Authority and URA have detailed development control standards, but curved frontages often require case-by-case assessment. I strongly recommend engaging a qualified professional such as an architect or planning consultant who can review your property survey and advise on the correct setback application for your rebuild project. They can also liaise with URA if clarification is needed on how setback distances should be measured from your curved boundary.