Hi, You would need to remove at least one rafter allowing (based upon 400mm gap) giving you a width of 857mm approx. fit an MK width VELUX window as minimum (height depends on space) You will need to add extra rafters either one inside (new width 800 approx) and one outside. this needs to be...
Worth checking if the roof covering is rated down to pitch you have; 10 degree pitch should be treated as a flat roof (care must be taken with the up-stands as minimum 150mm height would apply for rain bounce/snow melt etc.) plus if it exceeds height from original planning application (or agreed...