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Normally if the mains power is working properly the batteries would not be called into play - only when the mains power has failed to supply the detectors - you should have this checked out. Maybe removed any batteries and then try to test/sound the detectors with the test button. How old...

The windows installed in my extension are cold bridging over the Thermobate insulated closers and must be moved according to my bco. How can i fix these properly as the windows are fixed through the middle of the 70mm frame and bco says to sit the frame into the cavity by 30mm which means...

It sounds as if you only have one staircase (from loft room to 1st floor then 1st floor to ground floor and final exit) If you only have the one exit staircase you should need the escpe window

If you not sure if he has put dpm below slab you should put one above to be sure. This will go below the screed.

Are you taking out the entire stack? (above roof) if not then you probably just need building regs