Some recognition problems begin before the AI sees the floor plan. A browser bar covers one edge. The screenshot includes half of a property listing. A paper plan was photographed from an angle, so one side looks much shorter than the other. The rooms may still be obvious to a person, but the outer boundary has become harder to follow.
You do not need a perfect architectural drawing. You do need a plan where the walls, entrance, and main rooms are easier to see than the surrounding clutter.
If you already have a floor plan, you can open the free floor-plan checker and compare your image with the checklist below before using AI recognition.
Start with the clearest version you have
A clean plan exported from an architect, property manager, or real estate listing is usually the easiest starting point. A screenshot can also work when the full home is visible and the labels remain readable.
A photograph of a paper plan needs a little more care. Place the sheet on a flat surface, hold the camera parallel to it, and use even light. Watch for a phone shadow across the center and glare over pale wall lines. If the page bends near the edge, flatten it before taking the photo.
When you have several versions, choose the one with the clearest structural lines rather than the one with the prettiest colors. A simple black-and-white drawing often gives more useful evidence than a furnished 3D rendering.
Keep the entire home in frame
Before cropping, find the outside wall of the home and trace it with your eyes. Every inward step, recess, and projecting section should remain visible. Cutting off a small wing can turn an ordinary irregular shape into what looks like a missing sector.
Leave a narrow margin around the outside wall. The boundary should not touch the image edge, but it also should not sit inside a large field of empty page, dimensions, title blocks, or listing details.
In the NineFengShui crop step, move the red box close to the outermost walls and leave balconies outside the box. That gives the checker a useful indoor boundary without asking it to interpret the rest of the document.
Remove the things that compete with the plan
Crop away browser controls, phone status bars, watermarks that cover walls, agent contact panels, page numbers, and a second floor plan shown beside the one you want to check.
Be especially careful with apartment brochures. They often place a unit plan inside a larger floor plate that also shows the corridor, lift, neighboring apartments, and shared stairs. Crop to your unit instead of uploading the full page.
Do not blur so aggressively that wall edges disappear. A little unrelated text is less harmful than a soft, broken outer wall.
Keep useful architectural clues
Not every mark is noise. Door swings, room labels, beds, kitchen counters, sinks, and toilet fixtures can help distinguish one room from another. Keep them when they are part of the original plan and still legible.
The outer wall remains more important than furniture. If a decorative sofa covers a wall in a 3D sales image, look for a simpler drawing of the same home. If the only available image is heavily furnished, the manual nine-grid option may be faster than repeatedly editing the picture.
Make the main entrance visible
The front door is easy to lose in a tight crop. Keep the full doorway, its opening arc when shown, and enough of the nearby wall to understand where the entrance sits.
Some plans show several doors to terraces, service areas, or shared corridors. AI may not know which one your household uses as the main entrance. Treat the recognized door as a suggestion and confirm it yourself in the orientation step.
If the entrance is outside the printed plan or hidden by a label, use manual marking instead of guessing.
Straighten the image before uploading
A small tilt is usually manageable. Strong perspective is different. When the top of a photographed page looks much narrower than the bottom, equal rooms no longer occupy equal areas in the image.
For a paper plan:
- Put the page on a flat surface.
- Hold the camera directly above it.
- Include all four corners in the first photo.
- Use the phone's crop and straighten controls afterward.
- Check that vertical walls look vertical and horizontal walls look horizontal.
Do not rotate the home just to put north at the top before recognition. The layout and the compass direction are confirmed in separate steps. First make the plan easy to read. Then set the real orientation from information you trust.
Use enough resolution, not the largest file you can find
Zoom in on the image before uploading. You should be able to follow the outside wall and recognize the main room labels without guessing. If the plan becomes blocky at that point, look for the original download instead of enlarging the screenshot.
An enormous image is not automatically better. Extra page area, scanner borders, or a high-resolution blank background adds file size without adding structural evidence. A close, sharp crop is the better choice.
Review the AI draft before generating the report
AI recognition is a shortcut into the nine-grid, not a final judgment. Pause on the review screen and compare four things with the source plan:
- Does the filled outline follow the home's real outer walls?
- Are large recesses and projecting areas represented in the right place?
- Are the kitchen, bathroom, and bedrooms assigned to the right part of the grid?
- Is the main entrance correct?
One wrong room or boundary can change the issues that appear later in the report. If the draft is clearly off, go back and crop a cleaner image or use manual marking. That usually takes less time than trying to reason from a report built on the wrong map.
For an irregular home, it may also help to read how to find the center of an L-shaped house before confirming the grid.
Know what happens to the image
NineFengShui offers two different ways to use a floor plan. If you import it only as a tracing background, the image stays in your browser. If you choose AI recognition, the cropped plan is sent for that analysis.
Use the option that matches your comfort level. You can complete the checker manually without sending the plan for AI recognition.
A quick check before you upload
Take one last look at the image:
- The whole home is visible.
- The plan is straight and not photographed at a steep angle.
- The outside wall is darker or clearer than the surrounding marks.
- Browser bars, listing panels, and neighboring units are cropped out.
- Balconies are not included in the indoor boundary.
- The main entrance is visible, or you are ready to mark it manually.
- Room labels and major fixtures remain readable.
- You know the AI result still needs your confirmation.
If most of these are true, the image is ready. Upload the floor plan and create a free nine-grid draft. If the source is too messy, choose a template and mark the shape manually instead.
Related reading
- Feng Shui for Beginners: The Nine-Grid Method Explained
- How to Find the Center of an L-Shaped House
- How NineFengShui Reads a Floor Plan
Cover photo by Sven Mieke on Unsplash.