The trundle bed with included mattress is sold as a space-saving solution, but everyday life tells a different story. Here are specific situations I’ve seen (and suffered through) when setting up and using this type of bed, with what works and what doesn’t.
The case of the 55 m² flat with regular visitors
An 18 m² living room that doubles as a guest bedroom two weekends a month. The trundle bed opens over the sofa and the included mattress, almost always 12-15 cm foam, is enough for two nights in a row. From the fourth night on, most guests start complaining about their lower back: it’s not a mattress for daily use.
A practical detail almost nobody mentions: when the trundle is under the main bed base, the extra mattress gets dirty with the dust that falls on it. You can avoid this with a breathable cover and by removing it every 2-3 months. It’s not a manufacturing defect, it’s physics.
Shared children’s room: what does work
Two siblings, aged 6 and 9, in a 10 m² room. The trundle bed is only opened when a friend sleeps over. The included mattress holds up well because the weight is low and the use is occasional. Here the key point is thickness: below 10 cm, a 9-year-old feels the bed base when turning over. Before buying, check that the mattress isn’t just an 8 cm layer of foam with a cover.
Remote work studio with a hidden bed
A 9 m² office where the trundle bed replaces the sofa bed. The real advantage is that the trundle doesn’t need 2 metres of wall cleared: it opens parallel to the furniture. The limitation: the rail mechanisms require a level floor. In old flats with uneven flooring, the bed tends to misalign and the stops have to be adjusted from time to time. According to hardware manufacturers’ documentation, most rails support between 80 and 120 kg per drawer, but it’s worth checking the specific technical sheet.
What you should NOT expect from a trundle bed with included mattress
- Use as a main bed: the included mattress rarely exceeds 15 cm and isn’t designed for continuous nightly use. If it’s your everyday bed, consider replacing it with a spring or high-density foam mattress compatible with the drawer’s thickness.
- Assembly savings: the mattress usually comes vacuum-packed. Let it recover its shape for 24-48 hours before using it; if you open it and use it the same day, the first night feels firmer.
- Storage access: many models with an included mattress sacrifice the lower drawer. If you need to store bedding, check that the trundle doesn’t take up all the space.
A common measuring mistake
Measuring only the mattress space and not the opening clearance. The trundle bed needs between 190 and 200 cm of free space in front. In narrow rooms, the bed opens against the wall and you can’t get past. The practical solution: open it diagonally or choose a model with side opening.
Transparency about the included mattress
Not all included mattresses are the same. There are HR (high resilience) foam ones that withstand occasional use better, and others made of basic foam that deform within months. I can’t guarantee a specific lifespan because it depends on weight, humidity and the room’s ventilation. What I do recommend: ask about the density (from 25 kg/m³ is a reasonable reference for occasional use) and about the cover, which should be removable and washable.
In short: the trundle bed with included mattress solves the space problem for occasional guests, but it’s neither a main bed nor a medium-to-high quality mattress. If the use is frequent, consider buying the mattress separately or choosing a model with a deeper drawer.