I need a Structural Engineer

Wanting to turn a kitchen window on the back wall of our house into 2 or 3 dr bifold doors. It's not a massive refurb, we just need to know what size doors we can have and how much space above we need to leave for lintel (and beam specifications). We had someone booked in to do this this week, with the aim they could get specifications to us by mid week next week, however they have just come down with Covid so can no longer assist. looking for someone who is able to do a similar turnaround on timings. Images attached for reference