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Before fitting an external door, you must first decide whether you are going to replace the door slab only, or also replace the door frame, as this affects whether you require permission from Building Control.
It is often easier to purchase a doorset, which comes already hung in the frame, particularly where the existing frame isn't square, as this can reduce problems and the time taken to fit the door, ensuring a better finish. However, when replacing both the frame and the door slab, you are required to either:
Measure the door opening or the existing door if it's a good fit, to ensure you get the right size door.
Different doors allow different amounts of trimming so if you can't buy the exact size, make sure you check the amount you can trim so that you can achieve the perfect fit.
Trimming to size
Hold the new door in the frame to see if it needs adjustment.
A well fitted door should have a 2mm gap on either side and also at the top. The gap at the bottom will depend on the thickness of your flooring/carpet.
Plane the door as required, using an electric plane will help you get an even finish, and sand for a smooth finish.
Adding additional extras e.g letter plates, weather bar/rain deflector
If you would like to add a letter plate, measure where you would like it to sit and cut out the hole. Remember, any cutting made to the door will require protecting with an appropriate base sealer. See our finishing wood page for more details. You can then fit the letter plate.
We also recommend fitting a weather bar/rain deflector to further protect the door.
Fixing hinges to the frame
Check new hinges fit the old ones in the frame. If not, mark on where new ones will sit and chisel away the extra wood.
At least three hinges will be required for an external door.
Screw each hinge in place with one (centre) screw. The hinge knuckle should stick out from the frame edge.
Prop the door in the door frame using wedges to ensure correct gap at the bottom.
Mark where the top and bottom of the hinges sit on the door.
Fixing hinges to the door
Unscrew hinges and lay them on the edge of the door, lining up with the pencil marks. Draw around the hinge.
Chisel out the middle to the same depth as hinge flap.
Check hinge fits flush and fix with one (centre) screw per hinge.
Hanging the door
Support the door on wedges and fix hinge flaps to the door frame. Ensure the door opens and closes smoothly and finish fixing with all screws.
Fixing the handle/lock
There are a number of different locks available on the market including mortice locks, rim locks or multipoint locking systems. Whichever one you choose, follow the manufacturer's instructions on how to fit.
For advice on how to finish your products, visit our Finishing Wood page.