How much would metal architectural external staircase cost?

[CoolHands]

I'm asking an unknowable question but has anyone got ANY kind of ball-park figure for how much an external metal spiral staircase would cost to have fabricated for what is effectively a 3-story property?

Staircase sort combination of this



and this



to go on the back of this:



would convert the windows to be doors to allow access to the staircase. What sort of money???!

Edited by CoolHands on Monday 6th April 20:12

[CoolHands]

thanks. Had one estimate so far, of 20-30 thousand plus vat!

[CoolHands]

thanks nuisance - that link shows they are obtainable quite cheaply, for between 2 - 4 thousand. Although the top floor is 4 meters, and need middle access so probably can't buy it off the shelf. But it gives me hope!

Thanks elster - but I'm in london! I will contact the parkinteriors link above and see what they say. Perhaps an off the shelf can be bought and altered by local fabricator (eg landing platforms) to keep cost reasonable.