I spent $36,000 renovating my bathroom. It's gorgeous, but there are 5 mistakes I wish I'd avoided.

I added shower niches for storage and was thrilled with my design choices until I had my first shower and noticed water pooling in both shelves.

After a quick Google search, I realized the tiling at the bottom of a niche should be angled to let the water drain. I hadn't thought of this, and my contractor apparently hadn't either.

The niches aren't angled at all. Worse, they're in a part of the shower that gets especially wet.

They don't always dry between showers so, over time, water could seep through the tile and into the framing behind — which might eventually cause another mold problem.

During the design process, I had to select a grout to accompany my beautiful white-gray Carrara marble tiles.

At the time, I chose a light color thinking it would seamlessly match the tiles — it did. Unfortunately, it's also a dirt magnet in the high-foot-traffic area around the sink.

No amount of scrubbing has helped thus far and comparing it to the pristine tile under the vanity hurts my heart a bit. Next time, I'll go at least two shades darker with floor grout to help mask the unavoidable grime of this busy zone.

It took forever to find the perfect floating vanity with drawers and space for two sinks. At last, I imported a beautiful fluted piece from Italy.

While awaiting its arrival, my contractor roughed in the plumbing based on the standard height for vanities. It turns out my piece was not standard — its cutouts for pipes didn't match up with the now-installed plumbing lines.

Fortunately, we were able to cut out a notch in the back of each of the drawers to accommodate pipes. This was better than buying a new piece, but it added another 400 Canadian dollars to my budget.

Next time, I'd ensure my contractor had all the specs before mounting or installing anything.

Although I'd put a lot of thought into the placement of pot lights in the ceiling, I neglected to do the same with vanity lighting.

Instead of, say, three lights placed at eye level or two over the mirrors, I settled on just one placed between the two mirrors. This was, in part, to save money.

But one light doesn't provide nearly enough illumination when you're using the mirrors. (Just ask my teens!)

I don't really have enough room for three sconces, but I wish I 'd at least placed one above each mirror. I'm now sourcing new (hopefully cheap) sconces, which I'll also have to pay an electrician to install. Ouch.

When I discovered my existing window had to go, I knew I wanted to replace it with an industrial-style one complete with grilles running in a grid on the outside.

I could already picture the adorable piles of snow that would collect in the corners come December. Since I was so certain and so busy I ordered my window over the phone.

When the window arrived, I was shocked to find the grilles were between the sheets of glass. I'd never seen this design before, and it was definitely not my intended vibe.

It was a custom piece, so I couldn't return it. Instead, I focused on the positives: This was much cheaper and way easier to clean than the ones with grilles on the outside.

Since it's a small window, I've gotten used to it and even come to like it. But if ever I'm in a position to add windows to another room in my house, I'll spend more time and money to ensure I order the grilles on the outside.