Common Mistakes to Avoid When Installing Internal Doors

Common Mistakes to Avoid When Installing Internal Doors

Aspect Key Takeaway
Measurements Always measure the door frame, not the existing door
Trimming Avoid excessive trimming to prevent exposing the door's core
Orientation Ensure correct door orientation, especially for panelled doors
Hardware Selection Choose appropriate handles, locks, and hinges for each door
Finishing Use suitable finishes to protect the door from moisture damage

Installing internal doors can significantly enhance the aesthetic appeal and functionality of your home. However, as a leading UK door manufacturer and retailer, we at UK Oak Doors often encounter common mistakes that can compromise the quality and longevity of door installations. In this comprehensive guide, we'll explore these pitfalls and provide expert advice on how to avoid them, ensuring a successful and professional-looking installation.

1. Incorrect Measurements: The Foundation of a Perfect Fit

One of the most critical steps in door installation is taking accurate measurements. Many DIY enthusiasts make the mistake of measuring the existing door rather than the door frame. This can lead to ill-fitting doors and a host of problems down the line.

Always measure the door frame, not the door you are replacing. Consider the door frame rebate, ensuring the new door matches the rebate thickness.

To ensure a perfect fit, follow these steps:

  • Measure the width at the top, middle, and bottom of the frame
  • Measure the height on both sides and in the middle
  • Check the rebate depth to ensure compatibility with your chosen door

For precise measurements and expert advice, consider our internal door lining sets, which are designed to provide a perfect fit for your new doors.


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Our solid oak door lining set ensures a perfect fit for your new internal doors.


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High-quality butt hinges are essential for proper door installation.


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A solid oak latch block provides a secure base for door hardware.

2. Excessive Trimming: Preserving Door Integrity

While some trimming may be necessary to achieve a perfect fit, excessive trimming can compromise the door's structural integrity. Over-trimming can expose the door's core material, leading to weakness and potential damage.

To avoid this issue:

  • Always check the manufactures maximum trim allowance for your selected doors
  • Use sharp tools to ensure clean cuts
  • Sand the trimmed edges to maintain a smooth finish, and refinish with a hardwax oil

For doors that require minimal or no trimming, consider our internal oak doors, which are precision-crafted to standard UK sizes.

3. Incorrect Orientation: Ensuring Proper Door Alignment

Installing a door upside down is a surprisingly common mistake, especially with panelled doors that have distinct top and bottom sections. This error can affect both aesthetics and functionality.

Always check the door's orientation before installation, paying particular attention to panelled designs and pre-drilled hardware holes.

Door Type Orientation Check
Panelled Doors Ensure larger panels are at the bottom
Glazed Doors Check that glass panels are correctly positioned
Pre-drilled Doors Align hardware holes with frame

4. Choosing Incorrect Hardware: The Right Tools for the Job

Selecting the appropriate hardware is crucial for both functionality and aesthetics. Incorrect choices can lead to poor operation, security issues, and a compromised overall look.

When choosing door hardware:

  • Consider the door's weight and material
  • Choose handles and locks that complement your door style
  • Ensure hinges are appropriate for the door's size and weight

Explore our range of internal door hardware for options that perfectly match your doors and interior design.


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Solid oak chamfer architrave adds a elegant finishing touch to your doorways.


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Our Malaga satin nickel door lever pack offers style and functionality.


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The Victorian 4-panel solid oak door combines classic design with modern craftsmanship.

5. Incorrect Finish: Protecting Your Investment

Applying the wrong finish or skipping this step altogether can lead to moisture damage, warping, and a shortened lifespan for your doors. Proper finishing is essential for both protection and aesthetics.

For best results:

  • Use finishes specifically designed for internal doors
  • Apply paint, oil, or wax evenly and according to manufacturer instructions
  • Allow adequate drying time between coats

Our internal oak doors come pre-finished or ready for your chosen finish, ensuring optimal protection and style.

6. Underestimating Opening Arcs: Space Planning for Comfort

Failing to account for a door's opening trajectory can lead to cramped spaces and potential damage to walls or furniture. This is particularly important in smaller rooms or areas with multiple doors.

Consider the door's opening arc and ensure there's sufficient clearance for comfortable movement and furniture placement.

To address this:

  • Measure the full arc of the door when open
  • Consider alternative door types like sliding or bi-fold for tight spaces
  • Plan furniture placement to accommodate door movement

7. Poor Storage and Treatment: Protecting Doors Before Installation

Proper storage and handling of doors prior to installation is crucial for maintaining their quality and preventing damage.

Best practices include:

  • Store doors flat on a dry, level surface
  • Keep doors away from direct sunlight and heat sources
  • Inspect doors upon delivery and treat them before installation if necessary

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The Mexicano contemporary solid oak door offers a modern twist on traditional design.


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Our solid oak square edge architrave provides a clean, contemporary finish.


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Our ironmongery value pack includes all the essential hardware for your door installation.

Conclusion: Achieving a Professional Installation

By avoiding these common mistakes, you can ensure a successful and long-lasting internal door installation. Remember to measure accurately, choose appropriate hardware, and consider the door's finish and surrounding space. With careful planning and attention to detail, your new internal doors will enhance both the functionality and aesthetics of your home.

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