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Can I scan a home while I'm at a viewing?

Technically, yes — but ask the agent or seller first, and keep the scan to the room's surfaces rather than other people's belongings.

Why you'd want to scan during a viewing at all

A viewing typically lasts 20-30 minutes, and afterwards hardly anyone remembers whether the bedroom was 3.4 or 3.9 metres wide. That's what decides whether your current double bed and two nightstands will fit. A scan gives you a measured floor plan to work through calmly at home — and a basis for asking a contractor what it would cost to move the kitchen.

The listing's floor plan rarely answers that. It's drawn to give an overview, often without dimensions for each room, and it's usually based on the external areas found in the official building register — not the floor you can actually put furniture on. A scan or a takeoff gives you internal measurements, which are what an interior layout lives or dies by.

Ask — and ask specifically

The most important piece of advice is also the simplest: ask before you scan. Not a mumbled "do you mind if...", but a concrete sentence the agent can say yes or no to:

"Would you mind if I ran a quick 3D scan of the rooms with my phone? I'm only using it to see whether our furniture will fit — it stays on my own phone."

Experience shows most agents say yes once they know what's going on. What creates unease isn't the scan itself — it's a stranger walking around with a phone raised without having said why. A seller who sees you filming while standing in their own living room naturally thinks of something quite different from floor plans.

If there are other visitors at the viewing, the same applies to them. Wait until the room is empty, or ask people to step aside. It's both polite and it makes for a better scan — people moving around confuses the geometry.

What you should scan — and what you should leave out

A LiDAR scan for a floor plan needs surfaces and edges: walls, floor, ceiling, door openings, windows, alcoves and sloped storage. Everything else is noise for this purpose. So hold the camera at chest height and let it glide along the walls, rather than panning across the furnishings.

Things it's good practice to keep out of the scan:

• Photographs, letters, calendars and pinboards. That's other people's lives, not the home's geometry.
• Open cupboards, drawers and the medicine cabinet. If you need to know how deep a cupboard is, measure it with a tape measure instead.
• A child's room while a child is in it. Wait, or skip the room and measure the four walls with a tape measure.
• Out through windows towards the neighbour's garden or terrace. The neighbour hasn't agreed to anything.
• Screens left on showing someone's mail or calendar.

A good rule of thumb: if you'd feel uneasy about someone scanning it in your own home, don't scan it in someone else's.

A practical approach during the viewing

Here's the quickest way through without seeming intrusive:

1. Ask at the door, before you take your coat off. That settles it before you're standing in the middle of the living room.
2. Do the walkthrough first like everyone else, without your phone out. You'll get a better impression, and you'll know which rooms are worth scanning.
3. Scan the rooms that decide the purchase — typically the kitchen, living room and whichever bedroom is tightest. Not the whole house, if time is short.
4. Take a couple of tape-measure readings as a check. One wall length per room, noted in your phone. That way you can later see whether the scan was accurate.
5. Say thanks and mention that you have it. Being upfront afterwards is worth just as much as asking beforehand.

Told no? Draw it instead

Some sellers won't want their home scanned, and that's an entirely reasonable stance. The alternative then is to measure a handful of key dimensions and draw the home up afterwards. HouseSense can draw the home on graph paper with your finger: you place walls to a given size, add doors and windows, and get the same areas and the same takeoff as a scan would give.

What you need to bring home from the viewing isn't a lot of numbers:

• The length and width of each room you want to plan around.
• Where the doors sit in the wall, and which way they swing.
• The windows' width and approximate position.
• The ceiling height in one spot, if sloped ceilings are involved.

With those measurements you can draw the home at home and get a floor plan you can furnish. It's every bit as useful for deciding whether the sofa fits as a scan would be.

What happens to the scan afterwards

It's worth being able to answer this if the agent asks. In HouseSense, the scan stays on your own phone and in your own private iCloud. There's no account, no server run by the app maker and no tracking — and the home isn't published anywhere unless you create a share code for it yourself. That's a concrete and reassuring answer to have ready when you're standing at the door asking for permission.

In short

You can certainly scan a home during a viewing, and it's often the best way to bring internal measurements home with you. But it's someone's home: ask first, say what you'll use it for, scan surfaces rather than belongings, and leave the neighbour's garden and the family's photographs out of it. Told no? Measure a few key dimensions and draw the home up afterwards — the result is the same.