We got double glazed windows - but the adjustment for that was in one lump after that window.. So the $298 was for the single glass. That big window was only $2k I think from memory which I didn't think was much - but agree wasn't really practical.
As for the staircase, we went for the same one and it was $3494 FYI in our house. It may vary I guess from house to house, but that is how much it was in the Rochford.
they quoted us $2087 for this staircase (Hoffman 39), option 2 staircase.
their staircase options book was not very professional, lol. no proper photos, and its like some newbie tried to put photos and some details together.
i tried Metricon online system to try different styles, and materials to envisage our house, and that is very helpful.
its definitely worth trying, if someone hasn't.
PD has nothing like that at all, not even in hopetoun.
We loved that staircase too. I think that's option 4. It was $3667 for option 4. It will look a bit different in the Hoffman as there s an opening under the staircase. (No store room)