The building blocks
Most modular sofas are assembled from a small set of module types. Names and exact shapes vary between makers, but the roles are similar. Knowing what each does makes product pages easier to read and lets you design a layout that fits how you live.
Seats with arms (end modules)
An end module has an armrest on one side and an open side where it joins to the next piece. You need two of them to finish a straight sofa, one at each end, unless you use a corner or chaise that includes an arm.
Arms give a place to lean, rest a drink or lay a head down. They also add width. If space is tight, a sofa with fewer or lower arms leaves more room for seating in the same length.
A seat with two arms is a standalone loveseat or chair. It can be used alone or as part of a larger arrangement.
Armless seats (middle modules)
An armless seat has no arms and joins to a module on both sides. It is the simplest way to add seating length, as every armless piece adds one seat, and nothing else, to the row.
Armless pieces are good for extending a sofa to seat more people, and for flexible arrangements where you want to add or remove seats. Because they are open on both sides, they rely on the connection to the neighbors for stability, so check that the sections link firmly.
Corner modules
A corner module turns the sofa through ninety degrees. It lets you build an L or a U, and it is the piece that makes a sectional feel like a sectional.
There are a couple of styles:
- Wedge or diagonal corner. A triangular piece that shapes the corner and typically adds a seat that faces into the room. It tends to take more floor space.
- Square corner. A square module where the two straight runs meet. The corner seat is a seat everyone can use, but the corner is deeper and less comfortable for upright sitting than a regular seat.
Corners also usually take more room than a regular piece, so check how they affect walkways. Choosing the overall sectional shape is a separate decision, so this article focuses on the pieces themselves.
Chaise modules
A chaise is an extended seat that supports your legs, and it is normally placed at the end of a run. The long seat may include a back, an arm or both. It suits people who like to lie back with their legs stretched out.
A chaise can often be placed on either side. If the chaise is part of a one-piece sectional, its side may be fixed. With a truly modular chaise you can move it from left to right when rearranging.
A chaise extends further into the room than an ordinary seat, so check the clearance for traffic flow. It is also heavy and long, so make sure it will fit through the delivery route.
Ottomans and poufs
An ottoman is a low, backless, armless unit that serves as a footrest, extra seat or small table. In a modular set, an ottoman can be a piece that joins to the sofa, or a separate one that can move around.
Storage ottomans have a lid and an empty interior, which is useful for blankets and toys. Check the lid and hinge, especially if children are around, and follow the maker’s weight guidance when sitting on one.
An ottoman is the lightest way to add flexibility. Put it in front of a seat for a lounger effect, move it to a corner as extra seating for a gathering, or use it with a tray as a coffee table.
Other pieces
- Sleeper modules. A seat with a fold-out bed, for guests, usually called sleeper modules.
- Storage modules. Seats with drawers or compartments, which add storage but are often deeper or heavier.
- Console or table modules. Pieces with a flat top, sometimes built-in power points or cup holders, that fit between seats.
- Recliner modules. Seats with a mechanism that tilts the back and raises a footrest. They add depth and weight, and need clearance behind.
- Back-only or wedge fillers. Small pieces that close a gap in the arrangement.
How combinations change comfort and footprint
The same pieces can be put together in different ways, and each combination feels different.
- Two end seats with armless seats in between make a straight sofa. Every armless seat adds seating, but also length.
- Adding a corner and a second run gives an L. The corner often uses space that was dead before, which gives more seating per square foot of floor, though not always more comfortable seating.
- Swapping an end seat for a chaise gives lounging room for little extra width, though depth at one end increases.
- Adding an ottoman adds options without increasing the permanent footprint much, since it can be moved away.
When counting seats, remember that a corner seat and a chaise may not be as comfortable as a standard seat for everyone, and that the number of seats advertised can be optimistic. Real comfort depends on sitting depth and how people want to sit.
Planning a set
- List who sits where, and how often.
- Pick the shape that fits the room, using room measurements and a floor plan.
- Count the pieces you need, including the two ends.
- Check that the pieces connect to each other, and which side the chaise and corner open to.
- Plan an ottoman or two for flexibility.
- Ask whether you can add sections later. A system with good expanding capability gives you room to adjust, though availability is never certain.
A short list of pieces is enough for most rooms. The aim is a combination that matches the room and the way your household sits, with a margin for change.