# How VastuScan Checks a Home: Our Rules, Our Scoring, and What We Can't See

> How VastuScan turns a floor plan into a Vastu score: who decides the directions, how rooms are graded and scored, how remedies are costed, and its limits.

Source: https://vastuscan.app/blog/vastu-apps/how-vastuscan-checks-a-home
By Deesha (VastuScan's AI Vastu guide), reviewed by Editor, VastuScan. Published 2026-10-13.
Grades come from VastuScan's published Vastu rules: https://vastuscan.app/blog/basics/vastu-rules

VastuScan's AI does one job: it finds where the rooms, the main door and the centre are on your floor plan. Everything after that, which direction each room is in, its grade, the score and the verdict, is worked out by **fixed rules that are published in full**, so the same plan gets the same answer, and you can check every grade yourself.

This page explains each step, the numbers behind the score, and, just as plainly, what we can't see.

## What you give it

- **Quick Scan and Full Report:** a photo, scan or screenshot of your floor plan. You mark the **centre** of the home and set **north**. Both matter: every direction is measured from that centre, relative to that north.
- **Compass Check** (no floor plan): you stand at the centre of your home, find north with your phone's own compass app, and place each room on a 3×3 grid. Useful for rented homes, older homes, or when the builder hasn't shared a plan.

Villas and duplexes can be checked floor by floor, up to five floors.

## Step 1: reading the plan

The AI looks at your plan and returns, for each room, its name and outline, plus the position of the main door and the centre. It also takes a closer look at the door and the centre, because those two points matter most.

If the plan is too faint, blurred or cluttered to read reliably, **VastuScan stops and says so** rather than guessing. A wrong reading would give you a confident answer to the wrong question.

## Step 2: measuring the directions

This step is plain geometry, done in code:

- The circle around your home's centre is divided into **32 slices of 11.25°**, starting from the north you set.
- Each room's outline is laid over those slices. A room counts in every slice that holds at least 5% of its area, so a large room spanning two directions is treated as being in both.
- The main door counts in every slice that holds at least 20% of its width.
- The slices group into **16 directions** for rooms, and into **32 entrance padas** for the main door.

No model decides a direction. If you move the centre or turn north, the directions move with them, which is also why marking those two points carefully matters more than anything else.

## Step 3: grading every room

Each room is then graded by looking it up in [VastuScan's Vastu rules](/blog/basics/vastu-rules): 13 room types, each graded in all 16 directions, and the main door graded by its exact pada.

- Ideal: Recommended for this room.
- Acceptable: Workable; no specific objection.
- Problematic: Discouraged, but a remedy exists.
- Critical Defect: No remedy short of structural change or moving.
- Not assessed: No rule at this bearing, or it depends on how the home is used. Not scored.


Where a room spans more than one direction, the worse grade counts. The centre of the home (the Brahmasthan) is graded as well: a toilet, kitchen or staircase there is a serious problem; an open living room or passage is ideal.

## Step 4: the score

Each grade earns points, and rooms count for different amounts:

| Grade | Points |
|---|---|
| Ideal | 100 |
| Acceptable | 85 |
| Problematic | 50 |
| Critical | 0 |

| Room | Weight |
|---|---|
| Main door | 20 |
| Kitchen, master bedroom, each toilet | 15 each |
| Living room, pooja room | 10 each |
| Every other room | 5 |

The weighted average is the home's score out of 100, and the score decides the verdict:

- Good: 75–100. No critical defects; any problems are minor or remediable.
- Caution: 41–74. One or more serious problems; remedies help but some trade-offs stay.
- Avoid: 0–40. A Critical defect (which caps a home at 40), or many serious problems.
- Any Critical defect caps a home at 40.


**One Critical defect caps the whole home at 40 and makes the verdict Avoid**, however good everything else is. That is deliberate. A Critical defect is one that no remedy can fix, so no number of well-placed rooms should hide it.

The score is fixed **before** any text is written. The report can explain the score; it can't change it.

## Step 5: remedies and the score you can reach

Every problem comes with remedies from the knowledge base, ranked by what they cost:

- No cost (₹0): Rearranging furniture, changing sleeping direction, swapping how rooms are used, decluttering, keeping toilet doors closed.
- Low cost (₹500–3,000): Zone colours in curtains and linen, plants, mirrors on the right walls, wind chimes, better lighting in dark corners.
- Medium cost (₹3,000–15,000): Repainting rooms, new light fittings, partitions between conflicting zones, copper or Vastu strips, a better main door.
- Needs construction (₹15,000+): Moving a kitchen or bathroom, changing door positions, adding or removing walls. The only answer to a Critical defect; consult a professional.


The report also shows the **score after remedies**: what the home reaches if every remedy is carried out. Remedies close two-thirds of the gap for an Acceptable placement and half the gap for a Problematic one. They do nothing for a Critical one. And a home where most of the plan is wrong gets a lower ceiling, because room-by-room remedies can't fix a layout that is wrong as a whole.

## Step 6: the written report

Only now does the AI write: a summary, what is working, what isn't, and what to do, from the fixed results above. In the Full Report it also describes the balance of the five elements and suggests colours for each room. The element balance is the AI's reading of your layout, not a calculation, and the report treats it as such.

After that you can ask Deesha, VastuScan's AI Vastu guide, about your own report, or send her a photo of a room to ask what it means. She answers from your report and the same rules.

## What VastuScan can't see

A floor plan is not the whole home. VastuScan does not assess:

- **The plot and surroundings:** slope, roads, a T-junction, neighbouring buildings, the soil, water on the site.
- **What's above and below you in a building** other than your own floors.
- **How you use a room**, where that changes the answer. A pooja room in the west is graded both ways, and the report explains both.
- **Septic tanks, borewells and lifts:** not in the rules yet.
- **Anything structural.** VastuScan is guidance based on Vastu Shastra, not architectural, structural or financial advice. For construction, consult a professional.

And a wrong input gives a wrong answer: a misplaced centre or a brochure north arrow that is off by 90° will move every room into the wrong direction. If something in your report looks wrong, check those two first.

## Questions to ask of any Vastu check

Whichever tool or consultant you use, these questions tell you how much to trust the answer:

1. **Does it confirm north with you**, or assume the top of the page is north?
2. **Does it measure from the centre of the whole home**, and show you where that is?
3. **Are its rules published**, so you can check a grade yourself?
4. **Does it tell you plainly when something can't be fixed**, or does every problem come with a product to buy?
5. **Will the same plan get the same answer** if you check it twice?
6. **Does it say what it can't see?**
7. **What does it ask of you before you start?** A phone number, an account, a payment? And what happens to your plan afterwards?

VastuScan asks for sign-in with Google, Apple or email, never a phone number. Your plans are private to your account, never sold and never used to train AI, and you can delete a home or your whole account at any time.

## Questions people ask

**Does the AI decide whether my kitchen is in the right direction?**

No. The AI's job is to find where the rooms, the main door and the centre are on your plan. The direction of each room is then measured in code from the centre you mark, and its grade is looked up in the published rule tables. The AI writes the report afterwards, from those fixed results.

**Will the same floor plan always get the same score?**

It should: the measuring and grading are done by fixed rules, and the reading step is set up to repeat itself. If you change the centre or north you mark, the result changes, because the directions change.

**What if my floor plan is unclear?**

If the plan is too faint or cluttered to read reliably, VastuScan says so and asks for a clearer one instead of guessing. A clear plan with readable room names gives the most reliable reading.

**Can I check Vastu without a floor plan?**

Yes. Compass Check lets you stand at the centre of your home, find north with your phone's own compass app, and place each room on a simple grid. You get the same kind of graded report, though without the exact room shapes a plan provides.