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How to Measure for a Shower Door
Measuring correctly is essential for choosing a shower door that fits securely, seals properly, and operates smoothly. Every bathroom is slightly different, and even small variations in wall alignment or tray size can affect the final fit. This guide walks through the exact steps needed to measure accurately for any shower door or enclosure, whether you’re replacing an old door or installing a brand‑new space.
📏 1. Measure the Opening Width (The Most Important Step)
The width of your shower opening determines the door size you need. Always measure in three places because walls are rarely perfectly straight.
- Top width — measure from wall to wall at the top of the opening.
- Middle width — measure across the centre.
- Bottom width — measure where the door will sit on the tray or floor.
Use the smallest of the three measurements. This ensures the door will fit even if the walls taper inward.
Why this matters:
Shower doors rely on an adjustment range built into the wall profiles. This allows the door to compensate for uneven walls and gives you a few millimetres of flexibility during installation.
📐 2. Check the Adjustment Range
Every shower door has an adjustment range, for example:
- 760mm door → adjustment 720–760mm
- 800mm door → adjustment 760–800mm
Your smallest width measurement must fall within this range.
Example:
If your opening measures 748mm at its narrowest point, a 760mm door with a 720–760mm adjustment range will fit perfectly.
🧱 3. Measure the Height
Measure from the top of the shower tray (or floor, for wetrooms) to the height you want the door to reach.
Most doors are between 1850mm and 2000mm tall.
This measurement helps ensure:
- The door clears any obstructions (radiators, windows, shelves).
- The enclosure height suits your bathroom layout.
🧭 4. Check if Your Walls Are Out of True
Walls that lean or bow can affect how the door sits. To check:
- Hold a spirit level vertically against each wall.
- Look for gaps between the level and the wall.
- Note any areas where the wall leans inward or outward.
Why this matters:
Adjustment ranges compensate for uneven walls, but severe misalignment may require:
- A wider adjustment range
- A semi‑framed door
- Additional wall channels
🚿 5. Measure the Shower Tray or Floor Area
If you have a shower tray:
- Measure the internal lip where the door will sit.
- Check the tray is level.
- Confirm the tray size (e.g., 760 x 760, 800 x 800, 900 x 900).
For wetrooms:
- Measure the full opening width at floor level.
- Ensure the floor is fully tiled and level where the screen will sit.
🔄 6. Confirm Door Clearance and Opening Space
Different door types need different amounts of clearance:
- Hinged doors swing outward — check for radiators, basins, or towel rails.
- Pivot doors swing partially inward and outward — still need space.
- Sliding doors need no outward clearance — ideal for tight spaces.
- Bi‑fold doors fold inward — great for small bathrooms.
This step ensures the door you choose will open comfortably without hitting anything.
🧩 7. For Quadrant & Offset Quadrant Enclosures
Quadrants require two key measurements:
- Tray size (e.g., 760mm quadrant)
- Radius (usually 550mm or 560mm depending on brand)
Measure:
- The straight edges of the tray
- The curve radius (if replacing an existing enclosure)
- The height from tray to desired enclosure top
Quadrant doors must match the tray size and radius exactly.
🛠️ 8. For Replacements: Measure the Existing Door
If you’re replacing a door:
- Measure the existing glass width
- Measure the existing wall channel width
- Note the adjustment range if visible
- Check the door mechanism (sliding, pivot, hinged)
This helps match the new door to your current setup.
Common Mistakes to Avoid
- Measuring only once — always measure top, middle, and bottom.
- Ignoring adjustment ranges — the door must fit the narrowest point.
- Forgetting obstructions — radiators and basins often block door swing.
- Assuming walls are straight — they rarely are.
- Measuring the tray edge instead of the opening width.
Quick Measurement Checklist
- Opening width (top, middle, bottom)
- Smallest width recorded
- Adjustment range checked
- Height measured
- Wall alignment checked
- Tray or floor measured
- Door clearance confirmed
- Quadrant radius (if applicable)