Best Flooring for a Loft Conversion
Flooring a loft conversion: deck construction, impact sound to the room below, access for materials, build height at the stair head and the safest choices.
Loft conversions have three flooring constraints that ordinary rooms do not: the deck is often newer and less settled than the rest of the house, sound travels straight down into a bedroom below, and you have to get the material up a narrow, turning staircase.
Handle those three and the choice itself is straightforward. Ignore them and you get a floor that creaks from the first month and a room below that can hear every footstep.
Check the deck before you choose anything
- Walk the whole floor and note any bounce, deflection or movement between joists
- Check every chipboard or ply sheet is screwed, not nailed, and screwed at close centres
- Look for sheets that have been cut and never properly supported at the edge
- Confirm no services run so close to the surface that a fixing could hit them
- Sweep and check for proud screw heads, which telegraph through any thin covering
Impact sound is the real design issue
Building regulations for a loft conversion cover fire and structure, and the acoustic separation to the room below is often the weakest part of the finished job. A hard floor in a loft bedroom above a main bedroom is a frequent regret.
Carpet on a good underlay is the most effective and cheapest acoustic treatment available. If the room must have a hard floor, use an acoustic underlay with a stated decibel reduction and, ideally, glue rather than float it so the whole floor does not act as a drum skin.
Options ranked for a loft room
| Option | Sound to room below | Creak risk | Access up the stairs |
|---|---|---|---|
| Carpet on 10mm underlay | Best | Low, underlay absorbs minor movement | Rolls can be awkward, but manageable |
| Carpet tiles | Very good | Low | Easiest of all, boxed |
| Click LVT on acoustic underlay | Fair | Medium | Easy, boxed planks |
| Glue-down LVT | Fair | Low if the deck is sound | Easy |
| Laminate | Poor | High on a flexing deck | Easy |
| Engineered wood | Poor to fair | Medium | Long packs can be difficult on a turn |
Build height at the stair head
A loft staircase often arrives at the floor with very little headroom to spare, and the top step relationship is fixed. Adding twenty millimetres of floor build up at the top of the stairs changes the going of that final step, which is both a trip hazard and a regulations issue.
Decide the floor finish before the staircase is finally trimmed if you can. Where the stairs are already in, match the build height of the new floor to what the joiner allowed, and tell your fitter the constraint before they quote.
Getting materials into the room
A four metre roll of carpet will not go round a tight loft stair turn. The practical solutions are to cut the carpet accurately downstairs and carry it up in a prepared piece, to use a narrower roll width, or to choose carpet tiles or planks that come boxed.
This is worth raising at the quoting stage. A fitter who has seen the access will price accurately, and one who has not may arrive with material that cannot physically reach the room.
Eaves storage and awkward angles
Loft rooms are full of sloping ceilings, eaves doors and knee walls, which means far more cutting and trimming per square metre than a rectangular room. Expect the labour element to be higher than the area suggests.
Where there is eaves storage, decide whether the floor runs into it. Continuing the floor a short way inside the eaves door looks far better than a raw edge, and costs very little at the time.
Fire and regulations points that touch the floor
A loft conversion has fire requirements that occasionally interact with the flooring. Any penetration through the floor deck, for example where a fitter fixes something into a service void, matters to the fire separation between storeys, so fixings should stay within the deck.
The stair itself is the other area to watch. Where a covering is added to loft stairs, the going and rise of each step must remain consistent, so a thick carpet and underlay on treads but not risers can create an uneven step at the top or bottom.
None of this is difficult, but it is worth mentioning to your fitter that the room is a conversion. A fitter who knows the context sets out the stairs and the threshold at the stair head differently from a routine bedroom.
Frequently asked questions
- Do I need acoustic underlay in a loft conversion?
- If you are fitting a hard floor, yes. Carpet with a normal underlay already performs well acoustically.
- Why does my new loft floor creak?
- Almost always deck movement rather than the covering. Screwing the deck down properly before fitting is the fix.
- Can carpet be carried up a narrow loft stair?
- Usually, if it is cut to size downstairs first. Tell your fitter about the access when they measure.
- Is laminate a bad idea in a loft?
- It is the noisiest option for the room below and the most likely to creak on a slightly flexing deck. Carpet or glue-down LVT are safer.
Keep reading
Why hard floors in flats transmit footstep noise to the flat below, and how acoustic underlay helps.
Why flats often need acoustic underlay for sound insulation, how ratings work, and what to check before choosing flooring.
Why timber floorboards squeak or feel uneven underfoot, and how we sort it before new flooring goes down.
See how we survey, prepare and fit carpet across Kent.
See how we survey, prepare and fit LVT across Kent.
Talk it through with a fitter, not a call centre
Book a free measure from our Gillingham warehouse and we will bring samples suited to the room discussed here, check the subfloor and leave you with a written quote.