Finding Unused Space Under Our Bathroom Sink

As we continue our quest for space optimization, we discovered some wasted space in the cabinet below the sink. Only the top half of the total cabinet space was usable as a cabinet when we bought it. The lower half of the space was closed off with a panel, in order to hide the plumbing connections and electrical runs.

An open cabinet with one shelf

a view of the inside of a bathroom sink cabinet

a view of a cat inside a bathroom sink cabinet
Barely enough room for one cat.

The area below the sink was opened for a previous project where I found myself tracking down a water leak. The space was closed off with a ¼ inch plywood panel to protect the water lines, drain, and some electrical feeds. When repairing the leak, I realized this area still had quite a bit of usable space, if I made a few modifications.

An open cabinet with access panel removed

My plan was to install a sub-floor in the cabinet and close off the areas with the water and electrical feeds using floating walls. I started by adding a grid of boards to the bottom of the cabinet space to support the new sub-floor and allow for some clearance to route the wire. I cut a paper pattern for the usable floor area and used that to cut a sheet of ¼ inch plywood. The cabinet will see a lot of use, so I lined these parts with woodgrain shelf paper for durability and to match the existing wood.

a view of the inside of a bathroom sink cabinet

The floating walls were cut from the same paneling as the sub-floor. The walls are attached to the cabinet face and the new floor of the cabinet, and the job is done.

This new area more than doubled our usable space under the sink!

An open bathroom cabinet with two shelves filled with towels and other bathroom items, and a toilet paper holder on the inside of the cabinet door.

A view of a cat inside a bathroom sink cabinet
We only post Tycho-approved RV modifications.

Published on July 11, 2019.

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