A twilight exterior is the single most clicked image in most listing galleries. Warm windows against a deep blue sky reads as a home rather than a building, and it is the shot buyers screenshot and send to a partner. The problem is that the real window for shooting it lasts about twenty minutes after sunset, on a clear evening, and it usually falls in the middle of showings.
Conversion takes a daytime exterior and rebuilds that evening light. The sky becomes a graded dusk, the ambient light on the facade cools and drops, interior windows are lit warmly from inside, and exterior fixtures — porch lights, path lighting, landscape uplights — are switched on. The result is realistic only if the lighting matches what the house actually has, which is why a good conversion starts from what is visible in the original frame.
Shoot the source photo with conversion in mind and the result improves markedly. Photograph late afternoon rather than noon, so the shadows are already long and directional. Turn on every interior light before you shoot, even in daylight — the conversion has something real to work from rather than inventing glow behind an empty pane. Avoid direct sun flaring into the lens.