Buying new doors can be a bit overwhelming, especially considering the wide variety of sizes available. While many suppliers follow "industry-standard" dimensions, these aren't universally applicable, particularly in markets like the UK, where older doors often have irregular shapes. Therefore, it's crucial to measure your existing doors before purchasing new ones, rather than relying solely on standard sizes.
To help you avoid common pitfalls and ensure a proper fit, we've put together a comprehensive guide with detailed instructions for measuring various types of doors. Whether you're replacing internal doors, external doors, or even bi-fold doors, getting accurate measurements is key.
---
### **Contents**
- How to Measure for New Internal Doors
- How to Measure for New External Doors
- How to Measure for Bi-Fold Doors
---
### **How to Measure for New Internal Doors**
Measuring for internal doors is straightforward if you're replacing an existing door. However, if the current door doesn't fit well or there isn't one installed yet, you'll need to measure the opening itself. Regardless of your situation, you must measure the width, height, and thickness of the door or opening.
#### **Step 1: Measure the Width**
Start by using a tape measure to record the width at three points: the top, middle, and bottom. Older doors or openings may not be perfectly rectangular, so take multiple measurements and use the largest value as your door width. Ensure you exclude any extra parts like weatherstripping.
#### **Step 2: Measure the Height**
Run the tape measure vertically from the top to the bottom of the opening. Repeat this in several locations to account for variations in height. Double-check that you're not including any additional components like door sweeps in your measurement.
#### **Step 3: Measure the Thickness**
Measure the thickness of the door by running the tape across its edge. Note this figure, then confirm that the door jamb on the frame is similarly sized, as you might need both measurements later.
---
### **Additional Considerations for Measuring Internal Doors**
If your opening already has a frame, measure from frame-to-frame and deduct 2-3 mm on each side to allow for smooth operation. If there’s no frame, measure the brick-to-brick opening and factor in adjustments for framing. Always remember that internal doors can vary in size, so measure each door individually.
---
### **How to Measure for New External Doors**
External doors are measured similarly to internal doors but often require additional considerations. If fitting into an existing frame, measure the new frame for a better fit. Be sure to measure the width, height, thickness, and any side panels.
When replacing both the door and frame, measure the rough opening (brick-to-brick). Adjust the dimensions by deducting about 2 inches from the width and 2.5 inches from the height to accommodate the new frame. Additionally, consider adding space for draft excluders, which can add up to 25 mm to the height.
---
### **How to Measure for Bi-Fold Doors**
Bi-fold doors demand precise measurements. Start by measuring the full width and height of the opening, including the frame. Use the smallest width and height values for ordering. Check the diagonals to confirm the opening is rectangular. Ensure the floor is level to prevent operational issues.
Larger openings, especially those with glass doors, may require adherence to specific UK building regulations. Always seek professional advice if unsure.
---
### **What If You Can’t Find the Right Size?**
If you struggle to find the perfect match, opt for a slightly larger internal door that can be trimmed down. For external doors, choose the smallest measurements. Be aware that trimming allowances vary by manufacturer, so verify this information before purchasing.
---
### **Can I Just Measure the Door I’m Replacing?**
While replacing an existing door, measuring the current one is usually sufficient. However, always double-check for fit issues or signs of wear.
---
### **Shop Internal and External Doors from Leader Doors**
With your measurements in hand, you can explore our extensive collection of internal and external doors. Leader Doors offers a range of styles, including custom options tailored to your specifications. Our friendly Door Experts are here to assist with advice, pricing, and availability. Call us today to learn more!
---
### **Related Articles**
- How to Trim Engineered Timber Doors
- How to Fit a Door Frame
- How To Fix A Sticking Door
---
This guide aims to simplify the process of choosing the right door for your home. Whether you're renovating or upgrading, accurate measurements are essential for a seamless installation.
Ningbo Safewell Plumbing Co., Ltd. , https://www.safewellbrass.com