You do not need to arrive at a retrofit conversation with a product already chosen. A useful enquiry gives the person reviewing it enough context to identify the next questions and check whether the existing shade is a suitable starting point.
Show what is there now
Include a photograph of the whole window and any available information about the shade manufacturer. Add the dimensions you have recorded, while making it clear which measurements still need to be verified.
Describe the outcome
Explain what you want to make easier. Perhaps the window is awkward to reach, several shades are adjusted together, or a room needs a clearer control arrangement. A description of the everyday problem helps keep the discussion focused on a suitable solution.
List the open questions
- Can the existing shade and mounting arrangement be assessed for compatibility?
- What further measurements or photographs are needed?
- Which power and control options should be checked for this window?
- What installation and handover work would be included?
Keep the first brief short
A clear page of information is easier to work from than a long message with important details scattered through it. Put the room name, photographs, observations, and open questions together, then add the product paperwork as a separate attachment if available.
The aim is not to make a final technical decision yourself. It is to make the next conversation more useful and ensure that everyone is assessing the same window.