How the two differ in kind
These are not two grades of the same product. Broadloom is a single continuous textile that arrives at a width the loom decided for you, gets held at the room's edges — stretched onto gripper over a cushion, or bonded straight to the slab — and behaves thereafter as one object under tension or one object stuck down. Carpet tile is the opposite proposition: discrete units, dimensionally stable enough to sit butted against their neighbours with no tension between them, each bonded to the floor on its own account and often with a releasable adhesive that expects to let go again. One floor is a field with a perimeter. The other is a grid of independent pieces that happen to touch. Almost everything below follows from that.
For an awkward or damp-risk room, two things do most of the deciding. Geometry is the first. Broadloom waste is set by the mismatch between your room and a roll width you cannot change, and it moves in steps rather than smoothly — a room a hand's width wider than the goods needs a second drop, and the fill strip left over is either used elsewhere on the same job or paid for as nothing. Tile waste is set by the perimeter instead, so only the border gets cut, the offcut from one edge frequently starts the opposite one, and an alcove, a chimney breast or a boxed-in column costs a few cut squares rather than reshaping the cutting plan. Water is the second, and the popular version of it is wrong: tile is not waterproof and broadloom is not uniquely destroyed by damp. What differs is where the absorbent layer sits. In a stretch-in broadloom floor the sponge is the cushion underneath, and a soaked cushion is written off rather than dried in place — which means lifting the carpet off the gripper and re-stretching it afterwards even where the carpet itself survives. A glue-down tile floor has no cushion to hold water and comes apart into squares that lift, dry and go back.
That advantage is real and narrow, which is the shape of this whole comparison. It applies to clean water caught early, not to a sewer backup, and it does nothing at all about the reason the slab was wet — if the floor has flooded once and nothing has changed, the honest first purchase is not carpet but whatever fixes the slab. Past that, the deciding question is what you expect to happen to this floor. If you expect events — a washing-machine hose, a cable that has to be pulled, a partition that moves, a chair leg through the pile — and you want each one to stay the size it started, the modular floor is the one buying you that. If you expect nothing in particular and want the room to read and feel like a room, soft underfoot and quiet overhead with no grid in it, broadloom is the better floor and the money belongs in the fitting.
The factors that actually differ
| Modular carpet tile | Broadloom roll carpet | |
|---|---|---|
| What the waste scales with | The perimeter and the layout: border cuts only, and the offcut from one edge usually starts the other. That reuse depends on the lay — a quarter-turn or non-directional floor takes an offcut in any orientation, while a monolithic lay (every arrow the same way) or an ashlar offset restricts which way a cut piece may be turned, so allow a little more on those. | The mismatch between the room and the fixed roll width, in steps — plus a full pattern repeat added to every drop after the first on patterned goods. |
| Getting it into the room | Cartons one person carries down a basement stair, through a fire door, into a lift. | A single long roll that has to physically make the turn — a tight stairwell or a dog-leg landing can force cutting on the truck, which pre-commits the seam plan before anyone has measured. |
| Fitting skill and tools | Chalk two control lines, dry-lay the grid, cut the border with a knife and a straightedge. Genuinely within reach of a careful amateur. | Stretch-in work wants gripper around the perimeter, a power stretcher and a heated seam iron used competently. This is a trade, and hiring it is where the cost of the floor concentrates. |
| After a wetting | No cushion to hold water; affected squares lift, dry and relay, and the ones under the leak are the ones you replace. | In the stretch-in case the cushion is the sponge and is normally a write-off, which means lifting the carpet off the gripper and re-stretching afterwards even when the carpet itself is fine. Glue-down broadloom has no cushion either, and loses instead on the unit of repair below — it still comes up as one piece. |
| The unit of repair | One square, swapped from attic stock in minutes, with no disturbance to anything around it. | A patch in a continuous field, which always shows to some degree; a bad enough area means recutting and re-seaming a drop. |
| Reaching what is underneath | Floor boxes, cable runs, a sump lid and a slab crack are all a tile lift away — this is why churn-heavy offices specify it. | Access means cutting the field and re-seaming it — an installer, a seam and a patch that shows, every time, where the tiled floor needs none of the three. |
| Underfoot and overhead | Thin and firm on a hard backing: less impact-noise reduction, and exactly what desk chair castors want to roll on. | Carpet over cushion is the softer, quieter floor by a clear margin — and castors drag in it, wearing tracks where the chairs live. |
| Rooms that are out of square | The grid is a ruler laid on your room and it reports honestly: a wall three degrees off announces itself as a tapering border row. | Absorbs it. Walls out of parallel disappear under the skirting, which is a real advantage in old basements. |
| Matching it years later | Keep spare boxes and record the batch; blending across boxes at install is standard practice. The honest caveat is shading — a new square in a faded field can read as new. | One dye lot, ordered once. Later matching is largely hopeless, which is the argument for ordering the whole room and any adjoining spaces together. |
Which one, and when
Choose modular carpet tile when…
- The room has a water history, sits below the water table, or contains the appliance that will one day leak.
- The plan is awkward: alcoves, a chimney breast, columns, a stair bulkhead, a corridor hanging off it.
- There are services under or in the floor — floor boxes, data runs, a sump, a cleanout — that someone will need to reach.
- You are fitting it yourself, or the access route cannot take a roll.
- The layout is expected to change: desks, partitions, tenancy fit-out, anything with churn.
Choose broadloom roll carpet when…
- A large, simple rectangle that the roll width covers in one or two drops, where broadloom's waste story is at its best.
- Softness and quiet are the point of the room — a basement den, a sitting room, a bedroom below grade.
- You want an unbroken field with no visible module at close range, which no layout pattern fully hides.
- The moisture question is genuinely settled, not merely unexamined.
- The look wanted is domestic; most of what is stocked in modular is contract loop and reads commercial, though cut-pile and patterned modular ranges do exist.
Now run your own numbers
This page holds no prices on purpose — a national average is wrong for almost every real project. Quantify both options with your dimensions and your local quotes.
Frequently asked questions
- Which one is cheaper?
- The two costs sit in different places, which is why this site publishes no figure for either. Broadloom is the labour-heavy side: the goods are ordered as a length off a fixed width, and the expense concentrates in skilled fitting — gripper, stretching, seaming, and the trip charge that comes with all of it. Carpet tile is the material-heavy side: the price is packed into the unit itself, which has to carry a stable backing that broadloom does not need, and the fitting is slow but unskilled. Then price the third thing, which decides more jobs than the first two: what it costs to change one part of this floor in five years. On tile that is a box from the store cupboard; on broadloom it is an installer, a seam and a patch that shows. Run both calculators on your actual room, take the quantities to local quotes, and compare the installed totals rather than the shelf.
- Can carpet tile go straight onto a basement slab?
- Sometimes, and the slab decides — not the carpet. A ground-bearing slab, especially an older one with no vapour barrier beneath it, passes moisture upward continuously, and adhesives have a stated limit for the slab's relative humidity and pH that has to be measured rather than assumed. Test first, and treat the adhesive manufacturer's acceptance figure as the governing number, because it is the one that voids the warranty. Where the slab reads too wet there are honest routes — a moisture-mitigation coating, a raised or dimpled subfloor panel that gives the slab an air gap, or a tile system designed for the condition — and one dishonest route, which is laying over it and hoping. The same test governs a glue-down broadloom job; only a stretch-in installation partly sidesteps it, and it still puts an absorbent cushion on a damp slab.
- If the basement floods, can I really save the tiles?
- Clean water, caught within a day or two, on a tile floor with a closed backing: often yes. Lift the affected squares, dry both the tiles and the slab properly with air movement, treat the slab, and relay. That is a genuine advantage over broadloom, where the cushion underneath holds the water, cannot be dried in place and is normally discarded — taking the carpet off the gripper with it. But do not stretch the claim. Water that has been through drains or has stood long enough to grow something is a disposal job for either format, backing or no backing, and the pad-free advantage says nothing about the wall base, the framing or the reason water arrived. Tile shortens the recovery; it does not make the room flood-proof.
- Which wastes less in an awkward room?
- Usually tile, and for a structural reason rather than a marketing one. Tile waste is a function of the perimeter — you cut only the border, and on a straight run the piece cut off one end frequently becomes the starter at the other — so an L-shape or an alcove adds a few cut squares and nothing else. Broadloom waste is a function of how the room's dimensions land against a roll width you cannot change, so a room slightly wider than the goods demands another drop and the leftover fill strip is only worth something if the same job has somewhere to put it. The exception worth knowing: a big simple rectangle sized close to a multiple of the roll width wastes very little broadloom, and there tile's steady border allowance is the higher of the two. Run both calculators on your real dimensions before assuming either way.
- Which is better under office chairs?
- Glue-down tile, clearly. Castors roll on a firm, thin, bonded surface and fight a thick one — carpet over cushion compresses under the wheel, the chair has to be pushed rather than rolled, and a track wears in where the chair lives long before the rest of the floor shows anything. It is also why commercial specifications for open-plan space lean to low-profile loop constructions with a hard backing. Broadloom can be made to work with a chair mat under each desk, which solves the rolling and imports a piece of plastic into the room's appearance. If the space is genuinely an office rather than a study, this factor alone often settles it.
- Does carpet tile always look commercial?
- It looks commercial when it is bought commercially, which is most of the time — the volume ranges are low-profile loop goods designed for wear and for hiding soil in an entrance lobby, and they look exactly like what they are. Three things move it: format, since plank and larger-format modules break the obvious square grid the eye picks up; layout, since a quarter-turn or non-directional lay reads as a woven field and is the most forgiving of shading, where a monolithic lay is the most directional of the common layouts and shows shading and lot variation as blocks under raking light; and construction, since cut-pile and patterned modular ranges exist and simply cost more than the contract loop. Broadloom still wins the unbroken field at close range in a domestic room. Judge it from a sample laid on the actual floor in the actual light rather than from a carton in a showroom.