Yes, checking your internal doors for racking or binding is something any homeowner can do safely — no tools or trade licence required. It's a useful habit because sticking, dragging, or misaligned doors can be early warning signs of structural movement, moisture problems, or settlement in your home.
What Are Racking and Binding?
Racking refers to a door frame that has shifted out of square — typically leaning or twisting so that the frame is no longer a true rectangle. Binding is when a door rubs, sticks, or won't close smoothly because the door leaf and frame are no longer properly aligned. The two often go hand in hand: a racked frame almost always causes a binding door.
These issues can be minor (seasonal timber movement) or a sign of something more serious, such as foundation settlement, subfloor deterioration, or structural framing problems.
How to Check Your Doors — Step by Step
1. Open and Close Each Door Slowly
Work through every internal door in the house. Notice whether the door:
- Swings freely without catching on the floor or frame
- Latches easily without you having to lift or push the door
- Has an even gap (called the clearance gap) around all four edges
A consistent gap of around 2–3 mm on the sides and top, and 5–10 mm at the bottom, is typical for a well-fitted interior door.
2. Look at the Gap Around the Door
With the door closed, stand back and look at the gap between the door leaf and the frame on all sides. If the gap is:
- Wider at the top on one side and narrower at the bottom — the frame has likely racked
- Uneven along the top or bottom — the door or frame may have twisted
- Missing entirely on one edge — binding is occurring there
3. Check the Frame for Square
Use a builder's square or even a large set square from a hardware store to check the corners of the door frame. Each corner should be 90 degrees. If you don't have a square, measure diagonally from corner to corner in both directions — if the two measurements are equal, the frame is square. A difference of more than a few millimetres is worth noting.
4. Look for Paint Cracking or Plaster Damage
Check the wall around the door frame for diagonal cracking in the plaster or GIB board, particularly running from the corners of the frame. This is a classic sign of structural movement and racking. Minor hairline cracks can be cosmetic, but wider or stepped cracks deserve closer attention.
5. Check the Door Hinge Side
Open the door fully and look at the hinge leaves — are they sitting flush, or has one pulled away from the timber? Loose or pulled hinges can cause binding on their own, but if the hinges are tight and the door still binds, the frame itself may have moved.
Common Causes in NZ Homes
| Cause | What to Look For |
|---|---|
| Seasonal timber movement | Binding in summer/humid months, fine in winter |
| Foundation or subfloor settlement | Multiple doors affected, sloping floors |
| Earthquake movement | Sudden change, diagonal wall cracking |
| Moisture or rot in framing | Soft spots near the frame, musty smell |
| Poor original installation | Only one door affected, gaps uneven from new |
New Zealand's varied climate — from the humid north to the cold, wet south — means timber framing and door frames can move with the seasons. Some seasonal movement is normal, especially in older homes with untreated timber. However, if multiple doors in different parts of the house are all racking or binding at the same time, that's a stronger signal of a structural issue.
Recording What You Find
If you spot problems, take photos and note which doors are affected and where the binding or gap issues occur. This information is very useful for a building inspector or tradesperson. Mark any wall cracks with a pencil line and date — if the crack grows beyond your mark, the movement is ongoing.
When to Call a Professional
DIY checks are a great first step, but some findings need expert eyes. Contact a Licensed Building Practitioner (LBP) or a qualified building inspector if you notice:
- Multiple doors racking or binding throughout the house
- Diagonal cracking in walls or ceilings near door frames
- Sloping or bouncy floors alongside door problems
- Any signs of subfloor rot or moisture damage
- Problems that appeared suddenly after an earthquake or storm
- A door that was fine and has progressively worsened over months
A professional building inspection can identify whether the cause is cosmetic, a maintenance issue, or something that requires structural repair — which may need a building consent from your local council. Always check with your council about consent requirements before undertaking structural repairs. You can find qualified local building inspectors and tradespeople on tradedirectory.co.nz.
For guidance on what building work requires consent versus what falls under Schedule 1 exemptions, visit MBIE Building Performance.
Safety note: If you suspect significant structural movement — especially after an earthquake — do not attempt repairs yourself. Have the home assessed by a professional before carrying out any work.
Licensed Building Practitioner (LBP)
BCITO Qualified
