What is a stop chamfered newel post?

It is a square oak post with the corners planed off (chamfered) along the middle section, leaving square ends, a classic detail that suits traditional and transitional staircases.

Do you supply full and half newel posts?

Yes, full posts anchor the open side of the balustrade and half posts fix against a wall so the rails line up neatly.

Can I replace just the newel post?

Often yes, though if the post is structural take care and make sure the replacement is fixed securely before removing the old one.