Depending upon the size of the room there can be more rug extension around the bed but not less which would make the rug look insignificant being covered mostly by the bed.
Rug under sofa rules.
For an area rug to look balanced under a bed it should be large enough to extend beyond the sides of the bed at least 18 inches for a king or queen bed and at least 12 inches for a full or twin bed.
Place the rug under the furniture.
One popular rule is that the rug should be large enough to slide under the front legs of sofas and chairs in a seating arrangement unifying the furniture.
Get a rug large enough so that the furniture is all on the rug or at least the front legs are on the rug.
Do extend rugs under furniture.
In a living room for instance all of the furniture should be on top of the rug if this isn t possible it s okay to have the front legs of major upholstered pieces on the rug and the back legs off.
Make sure the rug extends 6 12 past either end of the sofa.
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Although the rules about how to place a rug in a living room are more complicated the basic rule remains the same.
What size rug do you put under a sectional.
Leave at least 12 border of bare floor between the rug and walls but don t get a rug that s too small.
The best rule of thumb is to tuck at least 8 to 10 inches of the rug under the largest furniture piece in a room.
Ultimately there are no rules when deciding on the size of your rug.