What to Do With a Spare Room: Office, Gym, Guest Room or Something Else?

The spare room is the most argued-over space in the house. It's an office until someone stays, a guest room until someone works from home, and a gym for the three weeks after New Year. Most spare rooms end up as all of these at once and none of them properly: a desk with a bed behind it, a rowing machine under a pile of coats. Deciding what the room is for, and then committing to that, is the difference between a room that gets used and one that gets closed.

Start With How Often Each Use Happens

The honest exercise is to count. How many nights a year does someone actually stay? How many days a week is the room worked in? How often would the exercise equipment be used if it were set up and ready? For most households the answers are: a handful of nights, most of the week, and less than they'd like to admit. The room should be designed for the use that happens most, with the others accommodated rather than equal.

The Office

If the room's worked in daily, it's an office, and it should be a good one. A proper desk at the right height, a chair that's been sat in before it was bought, a monitor at eye level, a lamp, and a door that closes. Storage for the paperwork so it isn't on the desk. A window in front or to the side, not behind, for the screen.

The mistake is to make the office feel temporary because it's "the spare room". A room that's worked in forty hours a week isn't spare, and furnishing it as if it were is a false economy in comfort and in concentration.

Guests can still be accommodated with a sofa bed or a fold-down wall bed, which is a better arrangement than a permanent bed taking half the room for a handful of nights.

The Guest Room

If people stay often, the room's a guest room, and it should feel like one. That means a real bed, not a futon, made up as if for a hotel: white bedding, two pillows each, a throw, a bedside table with a lamp, water and a charger. Blackout blinds. Somewhere to put a suitcase. A hook on the door. A double at minimum, because guests come in pairs; most quality brands will have a double bed mattress collection that runs from the entry-level to the very good, and a guest bed that's better than expected is the thing visitors talk about.

The office can live in a corner, with a desk that folds or a small writing table that doubles as a dressing table, provided the work is cleared when guests arrive.

The Gym

Home gyms fail because they're set up in a room that's for something else, and the equipment is always in the way of that something. If the room's genuinely for exercise, it needs a floor that can take it, rubber tiles over the carpet, a mirror, ventilation, and the equipment set up permanently so that there's no barrier to using it. A yoga mat, a bench, a rack of weights, a bike or a rower: that's a room, and a good one.

It's the choice that's most often made aspirationally and least often sustained, so it's worth the honest count above before committing.

The Something Else

Some spare rooms are best as neither. A dressing room, for a couple whose bedroom has no wardrobe space, transforms the bedroom as much as the spare room. A library, with shelves on every wall and one good chair, is the room some people have wanted their whole lives. A hobby room for sewing, painting, music, model-making, where the mess can stay out between sessions. A playroom, for the years when toys are everywhere. A quiet room for a household with one person who needs one.

The test is the same: would it be used? A dressing room is used daily. A library is used nightly by the right person. A craft room is used weekly. All of them beat a gym that isn't.

The Room That Does Two Things Well

For most households the practical answer is a primary use and a secondary one that's genuinely accommodated rather than squeezed in. Office with a wall bed for guests. Guest room with a folding desk. Dressing room with a chair for reading. The key is that the secondary use has real provision, not an afterthought, and that the switch between the two takes minutes rather than an afternoon.

What doesn't work is three uses. The room with a desk, a bed and a treadmill is a room that's used for none of them and closed most of the time.

Making The Decision

Count the uses. Pick the one that happens most. Furnish the room properly for that. Choose one secondary use and make real provision for it. Get rid of everything else, including the exercise bike, which will be a hard conversation and a liberating one.

The Bottom Line

A spare room becomes a useful room when it stops being spare and starts being for something. Office, guest room, gym, dressing room or library: the honest count of how often each would be used decides it. Do one thing properly, one thing well enough, and nothing else, and the door stays open.