How to Compare Sunlight Between Apartments
Use a repeatable checklist for facade direction, floor height, nearby buildings, window geometry, and seasonal dates when comparing homes.
Last reviewed August 8, 2026Sunlight comparisons are strongest when every candidate is tested with the same assumptions and dates. A generic listing phrase such as bright, south-facing, or unobstructed is not a measurement.
Choose the receiving surface that matters
Pin the exact living-room window, bedroom window, balcony edge, or work area rather than the building entrance. Record the direction the exterior surface faces and the floor level relative to nearby rooflines.
Use one comparison protocol
For each apartment, use identical dates and time intervals. Compare winter, summer, and the months when you expect to occupy the home most. Keep window measurements and obstacle assumptions in the same units.
- Direct-sun start and end times for the important room.
- Approximate floor reach at selected times.
- The obstacle responsible for each transition into shade.
- Confidence level and source of every dimension.
Separate direct sun from room brightness
A room can be bright without a direct sun patch because diffuse sky light and reflections still enter. Conversely, a narrow direct beam does not guarantee comfortable daylight across a deep room. SunCarta estimates direct-beam geometry, not complete daylight performance.
Verify the finalist in person
Use the model to identify critical dates and times, then visit the strongest candidate when practical. A visit can reveal curtains, balcony slabs, tinted glass, temporary structures, or terrain that the simplified model does not include.
Questions about this method
Does a higher floor always receive more direct sun?
No, but added height can clear a nearby obstruction. The outcome depends on the receiving elevation, blocker height, distance, facade direction, and date.
Can SunCarta replace a property inspection?
No. It is a planning and comparison aid. Major property decisions should also use visits, documents, and qualified professional advice where appropriate.