A viewing lasts twenty minutes and a mortgage lasts twenty years. Take this list with you, tick it on your phone (your ticks are saved in this browser), and print it if you prefer paper. It works for renting too.
If you cannot travel, ask for a live video call rather than a recorded tour, and ask the agent to point the camera where you ask: into cupboards, out of windows, at the ceiling.
At the viewing
The building and the outside
Inside
Water, power and comfort
Light, noise and the street
Questions to ask the agent
Ask to see before you offer
This guide is general information, not legal, tax or financial advice. Rules change; check the details with a local professional before you sign or pay anything.