Bit more detail would be useful. Is a self closer fitted ? Does the frame or
the existing door have either an intumescent strip or brush seals. Routing
out a door and then fitting seals will have a significant effect on the
price I would charge.
As you are acquiring the materials yourself make sure that you buy the
correct rated fire door ( FD30 or FD60) and that the hinges are also fire
rated. Should the door not be a standard size you need to be aware that
there is only a very limited amout of timber that can be removed from a fire
door without compromising its fire rating.
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