Fitting a wooden door in your home might seem like a challenging task, but it’s a manageable project with the right approach. 

Whether you’re replacing an outdated door or installing a new one, a well-fitted door not only enhances the aesthetic appeal of your space but also improves energy efficiency and security. According to a report by Home Builders Federation, 79% of homeowners undertake home improvement projects annually, with door replacement being one of the most popular due to its impact on both functionality and design.

Wooden doors, in particular, are a preferred choice for their durability, insulation properties, and timeless charm. 

However, achieving a perfect fit requires precision and careful planning. This guide will walk you through each step of the process, from measuring and trimming to hanging the door and making final adjustments, ensuring that even a novice can achieve professional results.

How To Fit an Wooden Internal Door

Preparing Your Workspace

Before you begin, it’s important to gather all the necessary tools and ensure your workspace is safe and well-organised. Here’s a list of items you’ll need:

• Tape measure
• Hand saw
• Chisel
• Drill
• Drill bits
• Screwdriver
• Screws
• Door steady (to hold the door in place while you work)
• Safety goggles
• Dust mask
• Pencil
• Hinges (if not reusing existing ones)

Ensure you have a clear area to work in, preferably with a solid workbench or a sturdy surface where you can place the door securely. It’s also wise to wear safety goggles and a dust mask to protect yourself from wood dust and debris.

Measuring the Door Frame and the Door

Accuracy is key when fitting a wooden internal door. Start by measuring the old door frame. Use a tape measure to get the width, height, and thickness of the door frame. These measurements will determine whether you need to trim your new door to fit.

If you’re replacing an old door, you can use it as a template for your new door. Lay the old door on top of the new one, aligning the edges. This makes it easier to mark the necessary adjustments on the new door.

Tip: When measuring, take measurements at multiple points across the door frame. Door frames can sometimes be slightly out of square, so it’s important to get an average measurement or use the smallest measurement to ensure the door will fit.

Trimming the Door to Size

If your new door is too large for the frame, you’ll need to trim it. Most wooden doors have a small allowance for trimming on the sides, top, and bottom.

1. Mark the Trim Lines: Using a pencil and a straight edge, mark the areas where the door needs to be trimmed. Double-check your measurements before cutting to avoid costly mistakes.
2. Sawing the Door: Use a hand saw to carefully trim along the lines. It’s best to cut gradually and smoothly to avoid splintering the wood. If you’re trimming more than a few millimetres, it’s wise to remove equal amounts from both sides of the door, ensuring the door remains symmetrical.
3. Sanding the Edges: After cutting, sand the edges to smooth them out and remove any roughness. This will not only make the door easier to handle but also help it fit better into the frame.

Fitting the Hinges

Hinge positioning is crucial to ensure the door opens and closes smoothly. The most common setup involves placing one hinge 15 cm from the top of the door, another 20 cm from the bottom, and the third one centred between them.

1. Marking the Hinge Positions: Place the door into the existing frame or door steady, aligning it so it sits flush. Mark where the existing hinges will go on the new door. If the frame doesn’t have existing hinges, use a tape measure to mark the desired hinge positions on the door’s edge.
2. Cutting the Hinge Recesses: Use a chisel to carefully carve out recesses for the hinge plates in both the door and the frame. The recess should be deep enough for the hinge plate to sit flush with the surface. Be patient and precise here – the neater the recess, the better the hinge will fit.
3. Drill Pilot Holes: Once the recesses are ready, position the hinges and mark the screw holes. Drill pilot holes for the screws – this helps prevent the wood from splitting and makes it easier to drive the screws in.
4. Attach the Hinges: Secure the hinge plates to the door with screws, making sure they are firmly in place. It’s crucial that the hinges are aligned correctly to avoid the door sagging or binding.

Hanging the Door

With the hinges attached, it’s time to hang the door. This is where a door steady can be particularly helpful, as it holds the door in place while you secure it to the frame.

1. Position the Door: Lift the door into place within the frame, aligning the hinge plates with the recesses on the frame. It’s a good idea to have a second person to help with this step, as it can be tricky to hold the door steady and align it at the same time.
2. Insert the Hinge Pins: Once the door is in position, insert the hinge pins to connect the hinge plates on the door to those on the frame. If the door doesn’t align perfectly, don’t force it – instead, adjust the positioning slightly until the hinges line up.
3. Check the Door Swing: Gently open and close the door to ensure it swings smoothly. If the door sticks or doesn’t close properly, you may need to adjust the hinge recesses or trim the door further.

Installing the Door Handles and Latch Plate

With the door hanging correctly, the next step is to fit the door handles and latch plate. This part requires careful measurement and drilling, so take your time.

1. Mark the Handle Position: The standard height for a door handle is about 1 metre from the floor, but you can adjust this based on personal preference. Mark the position on the door where you want the handle to go.
2. Drill Holes for the Handle: Using the appropriate drill bit, carefully drill holes through the door for the handle spindle and screws. Make sure the holes are straight and aligned correctly on both sides of the door.
3. Fit the Handle and Latch: Insert the spindle through the hole, then attach the door handles on both sides. Secure them with screws, making sure the handles are tight and the spindle rotates smoothly. Fit the latch into the recess on the edge of the door and secure it with screws.
4. Install the Latch Plate: Position the latch plate on the frame where the latch meets the door frame. Mark around the plate, then chisel out a recess for it. Secure the latch plate with screws, ensuring it sits flush with the frame.

Final Adjustments and Finishing Touches

After fitting the door, it’s important to make some final checks and adjustments to ensure everything is working correctly.

1. Check the Door Alignment: Ensure the door sits evenly within the frame with consistent gaps along the top, sides, and bottom. If the gaps are uneven, you may need to adjust the hinges or trim the door slightly more.
2. Test the Door Function: Open and close the door several times to ensure it swings smoothly, the latch engages correctly, and the door remains steady in the open position. If the door is rubbing against the frame or floor, this can usually be resolved by trimming the door slightly more or adjusting the hinge positions.
3. Finish the Door: If you haven’t already, sand the door edges and surfaces to smooth out any rough spots. You may also want to paint or varnish the door to protect it and enhance its appearance.

How to Fit a Wooden External Door

Fitting external doors follows much the same process as an internal door, but there are a few additional considerations to keep in mind:

Before purchasing an external wood door, decide if you are going to replace the frame as well. If so, you may require permission from Building Control.

Buying a door ready hung in the frame – known as a doorset – is often the easiest option, particularly if your opening isn’t square. It can reduce problems and installation time, ensuring a better finish, but will mean you need to either:

• Employ a registered fitter who will notify the local authority on your behalf (you will receive a completion certificate as proof of compliance), OR
• Submit an application to your local authority and pay a fee to Building Control to inspect the work carried out

Choosing the right wooden exterior door

First, measure the opening or existing door, if it’s a good fit, to establish the size you need. If you can’t buy a product with the exact dimensions, make sure the one you choose can be trimmed back far enough to meet your requirements.

We also recommend adding a weather bar or rain deflector to protect external woodwork from the elements.

Read More: The Best Patio Doors For Security & How To Secure Them

Hanging the door

Hold the new door inside the frame to see if it needs adjusting – you are aiming for a two millimetre gap at the top and sides. The space you leave at the bottom will depend on the thickness of your flooring.

Use an electric plane to resize and sand to achieve a smooth finish. If you are adding a letterbox, decide where you want it and cut the hole, remembering to protect any raw edges with an appropriate base sealer. Take a look at our finishing guide for more information. (Hyperlink)

You will need at least three hinges on a wooden front or back door. If your new hinges don’t fit the existing spaces on the frame, mark where you want them to go and chisel away the wood. Fix each one in place with one centre screw, taking care that the knuckle protrudes, then use wedges to prop the door to the appropriate height and mark on the edge where the hinges will sit.

Release the hinges from the frame and line them up with your pencil marks on the edge of the door. Draw around them and chisel out the centre to the same depth as the hinge flap, before securing with a single centre screw.

With the door supported once again, fix the opposing hinge flaps to the frame and once you are sure it operates smoothly, finish the job by adding all remaining screws.

Handles and locks

There are a number of locks available for external wood doors, such as mortice, rim and multipoint systems. Always follow the manufacturer’s installation instructions.

You Might Like: How To Install Patio Doors in 8 Steps

Looking for Internal & External Wooden Door Options?

DoorsDirect2U have over 40 years of experience providing internal door and external door solutions to suit all budgets and specifications. You can purchase with confidence safe in the knowledge all products are backed with a manufacturers guarantee and modern security features.

Shop all Internal Doors and External Doors or contact us for expert advice!

How to Fit a Wooden Door FAQs