I have the below Macro to insert a row between groups of customers. Is it
possible to specify the row height of the inserted row, without changing the
height of the other rows?

Dim lastrow As Long, i As Long
lastrow = Cells(Rows.Count, 1).End(xlUp).Row
For i = lastrow To 2 Step -1
If Cells(i, 1) < Cells(i - 1, 1) Then
Rows(i).Insert.RowHeight = 15
End If
Next