SBD is a con job. You get one door tested and as long as you pay them you can flash the certificate around. It's a pension top-up scheme for retired coppers. It offers no more security than standards that are already in existence if specified.No, I'm factually correct, because that's one of my of specialisms in work. I'm not talking about fire, I'm talking about security - legislatively, a social build house must meet SBD standard, and if it doesn't, the developer loses a huge whack of funding. Plus Grenfell is donkeys old anyway and would've been exempt.
As such, doors, windows, etc must be SBD gold standard which are expensive bits of kit attack tested to stop sophisticated entry attacks.
Private builds do not. They can have £80 front doors if that's the cheapest they can get, which could be jemmied open with a screwdriver.