Flush internal doors
A flush door is flat on both faces with no panels or mouldings. It is the least expensive way to replace a full set of doors and the least likely to argue with a modern interior. The decision that matters is the core: hollow is light and cheap, solid is heavier, quieter and takes ironmongery anywhere.
Flush doors get written off as the builder-spec option, which misreads them. In a house with no mouldings anywhere else, a panelled door is the thing that looks bolted on.
They are also the doors where the specification underneath the face matters most, because there is no styling to distract from how the door actually behaves.
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Hollow core or solid core
A hollow core door is two faces over a cardboard honeycomb or a lattice frame. It is light, cheap and easy for one person to hang. A solid core door has a dense infill and is noticeably heavier, quieter and steadier in the hand.
| Hollow core | Solid core | |
|---|---|---|
| Weight | Light — one person can hang it | Heavy — two people, and consider a third hinge |
| Sound | Sounds and behaves hollow | Noticeably better sound separation |
| Ironmongery | Only where the lock block is | Anywhere on the edge |
| Trimming | Limited — the stiles are narrow | More forgiving |
| Sensible for | Bedrooms, cupboards, box rooms | Home offices, bathrooms, anywhere off a busy hallway |
The lock block is the thing nobody mentions
A hollow core door has a solid timber block built into one long edge, and that block is the only place a latch or a lock can go. Fit a latch outside it and the fixing has nothing to bite into.
The block is usually marked on the edge or noted in the fitting instructions, and it is not always centred at handle height on every size. Find it before you hang the door, not after you have chiselled the mortice.
What a flush door costs you
A flat face shows every knock, and a painted flush door in a hallway will collect them at pushchair height. The edges are the vulnerable part on a hollow core leaf, because there is very little material behind the lipping. Neither is a reason to avoid them, but it is a reason to put solid core on the doors that get used hardest.