i can only speak from experience,i have recently changed 2 d/g units in 2 seperate porches and on both occasions the glass company told me the unit has to be toughened,but does not have to be 'k' glass.if in doubt,just ring a window manufacturer and ask.if i'm wrong then i apologise,i've been given the wrong information and 2 customers of mine have the wrong glass in their porches.
That’s a good price for one window as long as the quality is OK. Make sure you get a FENSA certificate from the company or a certificate of conformance from the Council (Council will charge a fee) & a 10 year warranty. Also be aware that if the sill height is less than 800mm from the floor inside, the window must be toughened glass!
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