Oak staircase with black metal balusters

The metal balusters on this staircase are black to match the rest of the staircase's aesthetic.
We supply these at the correct length. They sit into a groove within the handrail and baserail, and the gaps are filled with the provided infill.

When there's a quarter turn on a staircase, that turn can be either a kite winder or a quarter landing.
Quarter landings take up more space than a kite winder. However, they're cheaper, pleasant to walk up, and, it can be argued, look better.

In this staircase's case, with so much space, a winder box would have made no sense.

The main run on this staircase (flight 2) is 1000mm wide.
It's this wide as the space is available, so it makes sense to do this.
The width of Flight 1 is 1150mm wide; this is just to fill out the available space so that the quarter landing fills the gap.

The feature tread to the bottom of a staircase adds an exciting detail. This staircase features a "single going curtail", which protrudes past the width of the stairs by 175mm. 
Using a feature tread here also means that having a post and balustrade is unnecessary.

If an oak stair is to be carpeted, it doesn't make sense to supply the treads and risers oak, given the cost saving.
As such, this staircase features MDF treads and plywood risers, ideally suited to carpeting.  
The main advantage of carpeting a staircase is that the treads will have more grip, which is often a priority when pets or children use the stairs.