A room door with a solid leaf and a standard rebate reaches, once installed, between 28 and 35 dB, against 50-55 dB for a well-built partition wall. Almost all the noise gets in through wherever air can pass: the gap under the leaf and the perimeter of the rebate, with a smaller contribution from the lock hole.
A leaf rated at 40 dB in a laboratory, fitted without a continuous seal and without a draught excluder, performs 10-12 dB worse than the data sheet once it’s in a corridor. What follows is the order in which these decisions are actually made, from the spec line to the check after installation.
Contents
1. Sound reduction: how many decibels are needed
A room’s acoustics behave like a plumbing system: the weakest point governs, not the average. On 12 sqm of wall at 52 dB, a 1.8 sqm door that only cuts 30 dB drags the whole assembly down to 38-40 dB. The door covers 15% of the surface and decides the result.
This explains why some properties have redone the walls between rooms and still collect reviews about noise. The disturbance that matters doesn’t come from the neighbour: it comes from the corridor, night-time voices and trolley wheels, housekeeping carts at seven in the morning, doors slammed shut. And the corridor gets into the room through the door.
The spec line needs to be written now, before looking at catalogues. If the goal is for guests not to hear the corridor, the declared value to ask for is at least 40 dB, written together with the four installation conditions that make it real: a continuous perimeter seal housed in a routed groove, a drop-down draught excluder on the bottom edge, a plumb sub-frame, and hinge adjustment at handover. A 32 dB leaf with an adhesive segmented seal solves nothing, and the money is spent regardless.
2. Leaf, frame and seals: where the decibels get lost
The declared value comes from a test bench, with a rigid wall and no lateral transmission. On site it always drops, for reasons that have nothing to do with the leaf itself. Sound goes around the door via the sub-frame, the plasterboard wall around it, and the continuous flooring that runs from corridor to room with no break under the threshold. And hasty foam filling between sub-frame and masonry leaves gaps that become sound channels.
| Configuration | Typical declared value | Realistic on-site performance | Indicative leaf and frame cost |
|---|---|---|---|
| Hollow-core leaf, adhesive seal | 25-28 dB | 20-24 dB | €250-450 |
| Solid leaf, housed seal and brush | 32-35 dB | 26-30 dB | €450-700 |
| Acoustic leaf, double seal and drop-down excluder | 40-42 dB | 33-37 dB | €800-1,400 |
| High-performance acoustic leaf, dedicated frame | 45-48 dB | 38-42 dB | €1,400-2,200 |
These figures are indicative ranges. The guaranteed performance is whatever the test report for the specific product states, and on site it’s confirmed by a check carried out by a competent technician.
Within this stage, the two details that matter more than everything else get decided. The first is the bottom gap, the biggest leak and the most ignored one: between the edge of the leaf and the finished floor there are typically 8-12 mm, and on a 90 cm leaf that’s 90-135 sq cm of open gap, the acoustic equivalent of a window left ajar. A bristle brush is a dust seal and closes nothing.
What’s needed is a drop-down draught excluder recessed into the edge: an aluminium profile with an elastomeric seal that a small piston lowers into contact with the sill when the door closes, with an adjustable travel of 10-15 mm, and that lifts again when the door opens. It costs 35-90 euros plus machining of the leaf, and recovers 8-12 dB.
The second is the perimeter rebate. An adhesive seal fitted in three segments that don’t touch at the corners leaves an acoustic bridge at every break. On doors with a declared performance, the work is done with a double seal on staggered planes, one on the rebate and one on the edge of the leaf, joined at 45 degrees and in contact. Two staggered seals achieve more than a single thicker one.
There’s still the handle-set hole, which passes right through the leaf: on a honeycomb hollow-core door, it opens up a connecting cavity and costs 2-4 dB. Leaves with acoustic performance have solid reinforcement in the lock area, and that becomes important at the next stage.
3. Fire-rated doors: the fire safety requirement and who sets it
The room door may carry a fire-resistance requirement depending on the property’s fire safety plan. Which class is needed, for which openings, and with what hardware, is decided by the qualified professional who signs off the fire safety file, not by the supplier’s catalogue.
Two practical points still need to be kept in mind at the buying stage: the certification applies to the assembly of leaf, frame, hinges, seals and self-closing device in the tested configuration, so changing the lock or adding glazing voids it; and the door closer is part of the performance, because a door left ajar doesn’t protect anything.
Wedge-shaped doorstops on these leaves are the most common violation found in hospitality premises, and the identification plate must never be painted over. Fire resistance of the door is only one piece: fire safety regulations in hotels require consistency between compartmentation, certified furniture and documentation kept on site.
4. Electronic locks: choose before the leaf, not after
Ordering the leaves and choosing the electronic lock afterwards is a mistake that gets paid for once the goods arrive: the machining is done at the factory against the specific manufacturer’s template, and the cut-outs aren’t interchangeable. On a finished leaf, the only fix is scrapping it.
The technologies on the market are: offline RFID card locks, programmed by an encoder at reception and powered by alkaline batteries with a declared life of 1-2 years, roughly 180-400 euros per door; networked locks, wired or wireless, that talk to the property management system in real time and let you revoke credentials, read access logs and know which battery is low, roughly 400-900 euros plus a floor gateway; and smartphone credentials via Bluetooth or NFC, which are usually added alongside the card for contactless check-in.
On PMS integration, it’s worth getting answers in writing before signing: whether an integration already runs in production between those two specific products, and in which version; whether keys are coded from the PMS or from a separate piece of software reception has to open on the side; what happens to already-issued cards if the network goes down; who updates the lock firmware; and how much the annual licence costs. A missing integration means reception typing every booking in twice.
On the joinery side, two precautions apply: the lock area needs solid reinforcement, because on a hollow-core door the fixing works loose within a season; and the battery compartment needs to open from the inside without removing the outer plate, because replacement is done by the property’s own maintenance staff at night, not by a technician called out specially.
5. Fitting in out-of-true openings in historic buildings
In renovations of historic buildings, the existing opening is rarely square or plumb: out of plumb by 10-25 mm over the height, the gap varying 10-15 mm between the base and the head, wall thickness different from one side to the other, an out-of-level lintel.
The survey needs five measurement points, not one: gap at the base, at mid-height, at the top, and thickness on the left and right. The sub-frame should be fitted plumb rather than flush to the wall, because the discrepancy gets absorbed by the trim, not the door: a leaf fitted to follow a crooked wall compresses the seal on one side and doesn’t touch on the other, and acoustically it’s a write-off.
Telescopic architraves with 15-20 mm of adjustment cover variable wall thicknesses without improvised fixes; beyond that tolerance, you need a made-to-measure frame with calculated splay. Foam filling has to be done with the sub-frame locked in place with spacers, otherwise the pressure bows the jamb and the door starts rubbing two weeks after handover. This kind of fault always shows up once the site has closed, and it’s one of the reasons installation should go to a team that’s already worked in irregular openings.
6. Door finishes and coordinated hardware
The door is the first vertical surface a guest touches, so its finish belongs to the same family as the hotel wardrobe, not to a separately chosen catalogue. Two slightly different beiges next to each other look worse than two openly different colours.
The combinations that work are few, and they need deciding together with the rest of the vertical surfaces, including panelling. A matt lacquered leaf in the same sample colour as the furniture photographs well but marks on the corridor side, where the trolley knocks against it, and needs a bumper profile on the bottom edge.
A veneered leaf raises the issue of matching the timber species between two suppliers: sliced-veneer batches don’t line up exactly, and it’s solved by sending a physical sample with a declared tolerance, or by having the leaf veneered from the same batch as the furniture. HPL laminate is the more rational choice for the corridor side, for its resistance to scratches and cleaning products. A two-tone solution, dark on the corridor and coordinated on the room side, is technically sound and needs to be stated at the ordering stage: it can’t be applied to a leaf that’s already been made.
The room number plate should go on the jamb on the handle side, not on the leaf, where it disappears every time housekeeping props the door open: this is a basic rule of room signage and numbering. The handle is worth spending on with contract-grade judgement, stainless steel or brass with a PVD finish and a solid rose: cheap electroplated finishes flake on the back within two seasons.
7. Testing and adjustment after fitting
Adjustment after fitting is the stage that decides whether the decibels you paid for actually exist. The method we use in rooms is simple: run a sheet of paper along the whole perimeter with the door closed, and wherever the paper slides through without resistance, the door needs adjusting at the hinges. On the door closer, check the closing speed and the final latch, making sure the leaf reaches the rebate fully rather than just coming to rest against it.
8. Door maintenance and spare stock
The periodic check takes ten minutes per door: full closure through to the latch, seals intact, hinges tight, lock battery. Door closer springs lose tension and oil viscosity changes with the season, so after two or three years many doors no longer close fully. It’s worth keeping a leaf, a frame, two locks and a batch of seals in storage: finishes change batch, and years later the identical piece can no longer be found. If the spec is still open, these points should be written in before asking for a quote, because once the goods are ordered they cost far more.
Frequently asked questions about hotel room doors
How many decibels should a hotel room door reduce?
To avoid hearing the corridor, you need a declared value of at least 40 dB, which realistically performs at 33-37 dB once installed. Below a declared 32 dB, voices and trolleys come through. The number should always be read together with the installation: continuous perimeter seal in a routed groove, drop-down draught excluder, and hinge adjustment at handover.
Is a drop-down draught excluder necessary, or is a brush enough?
It’s necessary. A bristle brush is a dust seal: it lets air, and therefore sound, through. The drop-down excluder is a profile that mechanically lowers onto the floor when the door closes, with a travel of 10-15 mm, and seals the gap. On a 10 mm gap under a 90 cm leaf, the gain is in the order of 8-12 dB, for a 35-90 euro component.
How much does a hotel room door cost?
A solid leaf with frame, housed seal and coordinated finish costs roughly 450 to 700 euros, excluding fitting and lock. With declared acoustic performance around 40 dB, double seal and drop-down excluder, that rises to 800-1,400 euros. An electronic lock adds 180 to 900 euros depending on the technology chosen.
Can I change the lock on a fire-rated door?
Only with a component compatible with that product’s certified configuration. The certification covers the assembly of leaf, frame, hinges, seals and self-closing device: replacing one element with one that wasn’t part of the tested set compromises its validity. This needs checking with the door manufacturer and the professional who signed off the fire safety design.
How do you fit a door in an out-of-true opening?
The gap is surveyed at five points, the sub-frame is fitted plumb rather than following the wall, locked with spacers before foam filling, and the discrepancy is absorbed with 15-20 mm telescopic architraves or a frame with calculated splay. Following a crooked wall means the seal only compresses on one side, which compromises the acoustics.
