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Thornhill staircase after red-oak stair capping, with a squared starting step, new posts and custom oak framing around the stair opening.

PROJECT STORY · Stairs

Stair Capping & a Custom Eight-Foot Post in Thornhill

This Thornhill stair-capping project grew around one important change: squaring off the first step. That allowed us to follow the dark inlay in the existing floor, fit a more substantial post and rework the curved handrail. New red-oak caps and a custom eight-foot post completed the staircase in time for the family’s Christmas gathering.

Thornhill, OntarioStair capping and custom railing work

It started with the first step

The existing staircase began with a curved step, but the floor around it followed a different line. A dark hardwood inlay ran through the landing, and the rounded step did not follow that outline.

We squared off the main-floor starting step and constructed a wall for its end to return into. The new edge followed the floor’s inlay, giving the staircase a clear starting point that fitted the room around it.

That change also made room for a larger post with a five-by-five-inch base. Its proportions suited the house better, but fitting it meant dealing with the curved handrail above.

The rounded starting step was squared off to follow the dark inlay in the existing floor.

Keeping the curved handrail

We reused the existing handrail rather than replacing it throughout the staircase. Its shape was worth keeping, but its original connection did not suit the new post arrangement.

We cut the affected section and moved it four inches higher. That brought the curved end into the middle of the post, where the two pieces could meet properly.

It was a small adjustment with a visible result. The new post no longer had to be fitted around the old connection; the handrail was adapted to meet it.

Original Thornhill staircase with a rounded starting step, smaller post and curved handrail connection.
BeforeThe original curved handrail met the smaller starting post above the rounded step.
Completed Thornhill staircase with a squared starting step, larger oak post and repositioned curved handrail.
AfterThe retained curved handrail meets the new larger post above the squared step.

The starting-post and handrail arrangement before and after the staircase work.

An oak frame around the opening

The new wall solved the step return, but it also needed a finished edge. Leaving it as a plain wall would have missed an opportunity to tie the work into the staircase.

We fitted red-oak boards around the opening. The oak ran beneath the main-floor railing, turned up the new wall and followed the diagonal stringer beneath the stairs toward the tall post. Together, those edges framed the opening much like a picture frame.

The eight-foot post completed that frame. We special-ordered it to coordinate with the other posts, so its extra height did not make it look like an unrelated addition.

This was the custom woodwork that connected the changes: the squared step, new wall, oak border and tall post all had a place in the finished staircase.

Before view of the Thornhill stair opening with the original rounded step, railing and unfinished wall arrangement.
Before
Matching after view with the squared step, new wall, red-oak border and custom eight-foot post.
After
The new wall, oak border and custom eight-foot post finish the stair opening together.

New stair caps, coordinated with the floor

New caps gave the stairs fresh tread surfaces, while the retained handrail and existing flooring remained part of the design.

We stained and varnished the red oak to coordinate with the floor. The new work needed to belong beside the wood already in the house, not compete with it.

The result was more than a change of colour. The tread caps renewed the steps, the new posts changed the proportions of the railing, and the oak around the opening finished the areas between them.

Wide before view of the Thornhill staircase with the original rounded starting step, posts and railing.
Before
Matching wide after view with red-oak stair caps, a squared starting step, new posts and coordinated railing work.
After
The original staircase and the completed red-oak caps, posts and coordinated railing work.

Finished before Christmas

The deadline was close: the family was gathering for Christmas, and the staircase needed to be finished before they arrived.

By December 23, 2019, the work was complete and we were taking the finished photographs. The gathering was the following day.

What began as a stair-capping job had become a more considered staircase: a first step that followed the floor, a curved handrail adapted to its new post, and custom oak work that finished the opening from the landing to the underside of the stairs.

Planning answers

What homeowners can learn from this project

Is stair capping the same as stair refinishing ?

No. This project involved installing new stair caps, not simply sanding and restaining the original tread surfaces. We also reused and repositioned part of the handrail, fitted new posts and completed custom red-oak woodwork. The right scope depends on which parts of a staircase can stay and which need to change.

Can a rounded first step be squared off?

On this staircase, we squared off the main-floor starting step and built a wall for its end to return into. The new outline followed the dark hardwood inlay in the floor and made room for a larger post. The step, wall and railing were planned together rather than treating the tread shape as an isolated change.

Can an existing curved handrail work with new posts?

It did here, with modification. We cut and raised the affected handrail section four inches so its curved end met the middle of the new post. Reusing the handrail still required careful fitting; it was not simply a matter of swapping one post for another.

Why did this staircase need an eight-foot post?

The tall post completed the oak frame around the stair opening. The framing detail ran beneath the main-floor railing, up the new wall and along the underside of the stairs. We special-ordered the eight-foot post to coordinate with the other posts and bring those edges together.

Can new stair caps be finished to complement an existing hardwood floor?

That was part of this project. We stained and varnished the red oak to coordinate with the existing floor, while the squared starting step followed its dark inlay. Both the colour and the shape of the new work were considered alongside what was already there.

Can stair capping and railing installation be handled together?

Yes. This Thornhill project combined new caps with replacement posts, modifications to the existing handrail and custom oak finishing around the opening. Planning those elements together allowed the first step, post positions and handrail connection to work as a complete arrangement.

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