Doors and drawers acting up? Here's what July is actually doing to your joinery

Every July we get the same call: a door that used to close flush now catches on the frame, or a drawer that used to glide now needs a shove. It feels like something's broken. Usually nothing is, it's just moisture doing what moisture does, and winter is when it shows up most.

There are two different things happening, and they pull in opposite directions. If your home is heated, the warm dry air inside drops the indoor relative humidity well below where it sat in summer, often from the mid-60s down into the 30s. Timber gives up moisture to match that drier air and shrinks slightly across the grain. That's the gap-and-rattle symptom: a drawer that's picked up a wobble, a cabinet door that used to sit flush now showing a hairline gap at one edge.

The opposite symptom, swelling and sticking, shows up in unheated rooms and joinery closer to an exterior wall, where a run of damp winter weeks gets straight to the timber with nothing drying it back out. That's the door that binds on the latch side or the drawer that needs a shoulder to shut.

Both are normal. Solid timber moves seasonally, typically a percent or two of dimensional change across the grain between a Sydney summer and winter, and well-built joinery is designed with that movement expected, not fought. What isn't normal: movement that doesn't ease off by December, a gap that stays put rather than closing back up, or sticking bad enough that you're forcing the door. That usually means the joint itself has moved (glue failure, a warped panel, hardware that's shifted), not the timber breathing, and it's worth getting looked at rather than living with it for another year.