Another balcony thread

[dave1967]

Evening all

I have permission for balcony over my kitchen extension. Currently i been doing a bit of prep work as it had a flat roof originally but was turned into a pitched and tiled roof at some point in the 70s. I have now removed that as it was not fit for purpose and it looked a diy job. Currently got a 6x5m epdm installed on 18mm osb on 19mm t & g floorbords all in good cond from original build. 9x3 joists at 400 centers. Looking to float a qwickbuild or similar ali structure to support a deck. I have been told that these systems can only support balustrades up to 600mm off ground level without further structural support due to building regs. I dont want to compromise the epdm and don't want to fix the posts to the walls as they just don't look secure. Im happy to inset the post a couple of feet in and loose some space. Any ideas if a a 6x3 or similar timber frame around the deck fixed one end would be acceptable to support the posts.