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Can I see if there's room for the bookcase next to the sofa?

Yes — if the floor plan shows the actual clearance between the furniture and the wall corners in metres, not just a picture you have to judge by eye. Then you can see whether there's 40 cm or 90 cm left before you order anything.

Why "it looks like there's room" isn't enough

A room on a screen is often too small for the eye to judge a distance of 10-15 cm accurately — precisely the margin that decides whether a narrow bookcase can stand next to the sofa, or whether it just barely can't. Zoom in, and you lose the overview of the rest of the room; zoom out, and you lose the precision in the short stretch you actually want to know something about. A figure in metres solves both problems at once.

What a clearance measurement actually shows

A clearance measurement is the distance from a piece of furniture's edge to the nearest fixed point — typically the wall's corner, a door frame, or another piece of furniture. Place a sofa along a wall that's 4.20 m long, and the sofa itself measures 2.10 m, and there's in theory 2.10 m of clearance left — but how that clearance is split (is there 1.80 m at one end and 0.30 m at the other, or is the sofa centred?) is exactly what a clearance measurement shows you, which a flat drawing without figures cannot.

How to use it to plan a bookcase or a coffee table

1. Place the main piece of furniture first. The sofa, the bed, or the wardrobe that takes up the most space.
2. Check the clearance at the end where the next piece is going. If there's 45 cm and the bookcase is 40 cm wide, there's room — with 5 cm to spare.
3. Add the next piece of furniture, and check the measurement again. Confirm it actually fits, instead of trusting the eye.
4. Repeat for every new piece. The clearance changes each time something is moved or added.

Why the measurement has to be calculated against the true wall — even when the drawing has been straightened

Some floor plans "straighten" a crooked scan visually on the screen, so walls look vertical and horizontal even though the real wall leans a little. That's convenient to look at, but dangerous to measure by, if the clearance is calculated from the visually straightened line instead of the wall's actual, scanned position. A measurement that's correctly calculated must always start from what the scan actually found — not the neat, straightened-up version of the drawing. Otherwise a figure that looks precise on the screen can be 2-3 cm wrong in reality, because it's calculated from a line that doesn't exist in the house.

How much margin you should allow for

Even with a precise figure from a scan or a takeoff, it's wise to add a small margin on top when ordering a piece of furniture based on a clearance measurement. A scan can deviate a couple of centimetres from reality, and a piece of furniture rarely matches its stated dimensions exactly. If the clearance is 42 cm, and the piece of furniture you're considering is listed at 40 cm wide, the margin of 2 cm is cutting it thin — stick to furniture that's at least 3-5 cm narrower than the measured clearance if you want to be safe.

What a clearance measurement doesn't tell you

• Whether there's room to open cupboard doors or drawers. An empty clearance can easily fit the furniture's width, but not the extra space its moving parts need.
• Whether a radiator or a socket is in the way. The clearance measurement only calculates the distance between fixed surfaces, not what's mounted on the wall in between.
• Whether the furniture fits in height. A clearance measurement at floor level says nothing about whether the bookcase can stand under a sloped ceiling or a window sill.

A worked example: bookcase between sofa and door frame

The wall is 3.60 m long. The sofa takes up 2.05 m and is placed at one end. The door frame at the other end of the wall needs 10 cm of clearance to open without hitting anything. That leaves 3.60 − 2.05 − 0.10 = 1.45 m available — plenty for a bookcase up to about 1.35 m, if you keep 10 cm of margin at the other end too. Without a figure for the distance, that kind of calculation would require you to go out and measure it yourself every time you considered a new bookcase size.

Why the edges of an old wall make a difference

A wall that's been scanned or measured is rarely a perfectly straight line from end to end — skirting boards, uneven plaster and old buildings with minor settling all introduce some variation. A clearance measurement taken at one point on the wall can therefore differ by a few millimetres from the same measurement taken half a metre further along. In most cases that means nothing, but if the margin is already thin, it's worth taking the physical check measurement exactly where the furniture is actually going to stand, rather than relying on an average figure for the whole wall.

How to tell a clearance measurement apart from the room's total area

A clearance measurement and a room's floor area in square metres are two different things that are easily confused. The area tells you how much floor there is in total — useful for budgeting and flooring materials, but useless for deciding whether two specific pieces of furniture can stand next to each other. An 18 m² room can easily be too narrow for a particular combination of furniture along one wall, even though the total area is plenty. If you need to know whether something specific fits in a specific spot, it's always the clearance measurement along the relevant wall you should look at — not the room's total area.

What HouseSense does

In HouseSense, tapping a piece of furniture placed along a wall shows the distance from the furniture's two ends to the wall's corners in metres. The measurement is calculated against the wall's true, scanned position — not the visually straightened line the drawing otherwise shows you — so the figure holds even after you've straightened the drawing to make it easier to read.

Decision: when is a clearance measurement worth checking

1. Does a new piece of furniture need to stand next to one that's already placed? Check the clearance before you order — not after.
2. Is the margin under 5 cm? Measure physically with a tape measure before you count it as safe.
3. Do the furniture's moving parts — doors, drawers, a pulled-out bed — need space? Add that extra measurement on top of the clearance manually.
4. Has the drawing been visually straightened? Make sure the distance is calculated against the actual wall, not the neat line on the screen.