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Dear Forum

Could you please help me as I'm stuck. We've just undertaken a loft conversion necessitating fire doors. Our local  council is the London Borough of Richmond upon Thames.

I spoke to a door manufacturer today following an enquiry on their 4 panel door range. The advice I received was: The max trim off our doors is: 

10mm off each rail and also the bottom of the door.

3mm off the top.


Most fire door (FD30) sizes come as either: 1981 x 762 x 44mm  / 1981 x 610 x 44mm  / 1981 x 813 x 44mm. 

The fire door sizes we need are as follows:

Top floor:                            x3 single doors:

1.      194cm x 75cm x 3.5cm

2.      194cm x 73cm x 3.5cm

3.      193cm x 74cm x 3.5cm

  First floor:

1.      x1 single door: 195cm x 74cm x 3.5cm

2.      x2 double doors: 194cm x 58cm x 3.5cm

  Ground floor:

1.       x1 single glazed door: 196cm x 76.5cm x 4.5cm (dinning)

2.      x2 double glazed doors: 193cm x 58cm x 4.5cm (living)





Please can you advise what I should go for. How much I can trim if I buy slightly over-sized doors. I want to avoid BESPOKE doors as expensive and have long lead times as I need doors installed within 2/3 weeks max.


Thanks a million!



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I do not see any way you can you reduce the size of standard fire doors to a size you require and meet the manufacturer's limits. The minimum thickness of a FD30 fire door is 44 mm therefore cannot be hung in a frame designed for 35mm doors consequently you would need to fit fire door sets. (fire door & frame)

You could contact a specialists joiner and see if he has any solutions.


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  • 8 months later...

If it dates back to Victorian times whilst it may be a good solid door it's unlikely to have the 44mm thickness you would expect for a notional 30 minute fire door. 

Heritage doors that cannot be replaced with modern fire doors are often uprated to notional standards by the use of, for example, intumescent papers or varnishes applied to the risk side.

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