A house converted into flats usually has two kinds of door.
Some are proper fire doors fitted when the conversion was done. Others are the original doors from the house, painted and given a closer.
The second kind is the problem. A door made of old panelled timber has no test behind it, and a closer will not change that.

How to tell
Look at the top edge. A certified fire door usually carries a mark or a plug showing the maker's label. Nothing there, and the door is probably not rated.
We do not guess from the front. Send photos of the edge and the top and we will tell you what we can see.
What happens next
If it is a real fire door, we repair it as it stands. If it is a panelled or moulded door, repairs will not restore a rating it never had. We recommend a plain certified doorset instead.
Frames in older buildings
Floors settle and walls move. A frame fixed to a wall that has shifted leaves a gap that changes along its length. Our carpenters reset the frame and pack it before touching the door.
Local
Northwood is in the London Borough of Hillingdon. London Fire Brigade is the fire authority, and the borough's additional HMO licensing begins on 24 August 2026 for smaller shared houses.
From Luton
We have no yard in Northwood. The crew drives down and tells you the day before.
Questions we get asked
Can a period door be kept?
Only as a decorative door. If it has to act as a fire door, it needs a certified replacement.
Send it over with the postcode and we will price it door by door.
Get a price