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Can I walk through a floor plan before anything is built?

A line on paper and a felt distance are two different things. Walking into your own drawing at 1:1 scale, before a wall has moved or a room has been rebuilt, reveals mistakes a square-metre figure would never have shown.

Why a number is not the same as an experience

Most people are bad at picturing what "110 cm" or "14.7 m²" actually means in practice, when the figure sits alone on a drawing. You can calculate it, but you cannot feel it. It is the same reason IKEA and other furniture shops build showrooms instead of just selling by the measurement: a body in a room registers tight corners, low ceilings and too-short distances in a completely different way than an eye reading a drawing does.

That is especially true of three things that are hard to judge from above:

• Whether a passage actually feels wide enough to walk through carrying something, or whether two people can pass each other without turning their shoulders.
• Whether a ceiling feels low — the same floor area can feel completely different at 2.30 m and 2.60 m to the ceiling, but on a 2D drawing the room looks identical either way.
• Whether a door swinging open actually blocks something — a wardrobe, another door, a hallway — in a way that is hard to see when the door is just drawn as an arc on paper.

Is 1.10 m wide enough for a hallway?

Short answer: 1.10 m is a comfortable width for one person, with room for two to pass each other by turning their shoulders slightly. It is not enough for two people to walk past each other completely freely, and it gets tight if anything is in the way — a radiator, a row of coat hooks, the swing of a door. The clear width has to be measured between whatever actually juts into the hallway, not between the raw walls, and corners in particular, where a piece of furniture needs to turn 90°, often demand markedly more than the eye assumes. That is exactly the kind of judgement that is easier to make standing in the room than on a drawing — because you can hold your arms out, picture the chest of drawers, and walk the passage through.

What a 1:1 walkthrough can reveal that a measurement cannot

• Rooms that are large enough "on paper" but feel cramped — typically because a low ceiling or a sloped wall eats into the felt space without eating into the area.
• Furniture plans that don't add up, even though every single measurement fits in isolation — a bed that technically fits in the corner but blocks the wardrobe door when it opens.
• Sightlines — whether you can see out of the window from the sofa, whether a kitchen table blocks the view of a door.
• Whether a planned wall move actually solves the problem it was meant to solve — for instance, whether opening up a passage between kitchen and living room really gives the sense of space you imagined, or whether the result still feels divided.

The limit: a walkthrough is not reality

It is important to keep expectations realistic. A 3D model built from a drawing shows the geometry — walls, heights, openings, distances — but it does not show light, acoustics, materials, or the feeling a room has once it is furnished and lived in. It can tell you a passage is 90 cm, not what it feels like to walk through it every day for ten years. Use the walkthrough to catch geometric problems early — measurements that don't add up — not as a full substitute for standing in the finished room.

Nor is the model better than the numbers it is built from. If a wall is drawn 20 cm wrong, the 3D walkthrough inherits the same error, just in a more convincing wrapper. An impressive walkthrough is not proof of a correct measurement — it is another way of looking at the same number.

When does walking the model through make the most sense?

• Before you move a wall. See whether the new, open room actually feels the way you imagined, while it is still only a drawing to correct.
• Before you order a large piece of furniture. Stand in the room where it is going, and judge the distance to whatever is in the way.
• When a ceiling is low or sloped. This is where the gap between number and experience is largest.
• When two people need to agree on a room. It is easier to discuss a solution when both of you have "stood" in the same model than when one reads numbers and the other guesses.

What HouseSense does

On the drawing board in HouseSense, you can fold your own drawing out into 3D and walk around it at 1:1 scale, with the measurements written on the walls while you stand there — before a single wall has moved in reality. It works on both a drawn floor plan and one scanned with LiDAR, because both turn into the same named building parts under the bonnet: walls, doors, windows, rooms. The walkthrough uses the measurements you yourself drew or scanned in — it does not find new errors in the numbers, it shows you what the numbers mean once you are standing in the middle of them.

What needs to be in place before the drawing can be folded out into 3D

A 1:1 walkthrough needs more information than a flat 2D drawing does. Beyond the walls' positions, the app needs to know the ceiling height in each room — a figure a drawing seen from above can never see on its own, and one you therefore have to supply yourself when you draw without scanning. It also needs to know where the openings sit: a door or window drawn as a gap in the wall line only becomes a real opening in 3D once its width and position are set. If those numbers aren't in place yet, you can still see the drawing in 3D — but the walkthrough tells you less than it could, because a missing measurement is typically shown as a guessed default value rather than your own figure.

The disclaimer that always comes with it

A 3D walkthrough, however convincing it looks, cannot determine whether a wall is load-bearing, or whether a planned renovation needs a permit. It shows geometry, not construction. If you are tearing down a wall or opening a passage where a door used to be, it is still a building surveyor or an engineer who needs to look at it — not a model on a screen.