Adding an access panel to your attic is usually not difficult.
Build attic access panel.
Install a gasket around attic access openings to air seal between the opening and the panel covering.
Covers how to select a location find studs measure and cut a hole install tr.
Here in canada our minimum attic insulation requirement is r 40 that s a metric u value of 0 142 if you re in europe or actually using the units we re supposed to be in canada.
For either option you ll need to cut a hole in the ceiling for attic.
Move a stud finder across your ceiling to locate the joists.
Air seal attic access panels and drop down stairs to minimize air leakage.
We had the contractors just drywall over the original attic access panel.
Before installing the attic access hatch you will want to insulate the backside of it before putting everything in place.
Not sure why we did this probably because we knew that creating the small attic access door was easy.
In order to get your boxes into your attic you ll need to create an attic access panel or perhaps install an attic ladder.
Insulate the cover with rigid foam that is glued in place or batt insulation that is mechanically fastened e g with wires and screws.