The majority of staircases we supply have 90mm posts.
90mm newel posts are the industry standard and the most cost-effective option.

However, we keep 115mm posts on stock in both pine and oak.
Here are a few reasons why you might choose 115mm posts over 90mm:

You have a large hallway:

If you have a huge hallway, 90mm posts might look lost proportional to the size of the room, and, as such, it makes sense to use 115mm posts.
Also, in older houses like this, with very high ceilings, they can help the staircase fit in and look like it's always been there.

You want to make an impression:

It can be argued that 115mm posts look grander than 90mm posts due to their more imposing size.
In a traditional 1930s house like this, they can add more of a wow factor to the stairs and

The drawbacks to using 115mm posts are as follows:

Less choice of post caps off the shelf.
The stairs may need to be narrower as the post protrudes further past the string.
Higher cost.
In the wrong hallway they can look too big and out of proportion.

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