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ðŸ‡ŊðŸ‡ĩ Japan Office

1-22-7 Kasuga-koen, Kasuga-shi, Fukuoka, Japan

contact@dxmaster.net

+81 90-1013-3727

ðŸ‡ēðŸ‡ģ Mongolia Office

Yalalt Plaza Office, 4th Floor #409, 5th Khoroo, Chingeltei District, Ulaanbaatar, Mongolia

info@build-ai.tech

+976 9901-6721

ÂĐ 2026 Build AI. All rights reserved.

Built for construction operators

AI-assisted site feasibility for Japanese sites

BUILDPLAN

A plot on the map becomes a feasibility case and a PDF you can hand over.

BUILDPLAN takes one project through seven steps in a single web app: set up the site, generate massing, check it against Japanese building code, run the financial case and export the proposal.

Get the catalogBook a Demo

BUILDPLAN is built for the Japanese market: Japanese building code and yen today, with the interface in English, Japanese, Korean and Mongolian.

Draw the plot on a map and read area and perimeter as you draw
Generate massing and get a violations list for coverage ratio, floor area ratio and height
Export a PDF proposal with the financial case and an AI-generated exterior image

How BUILDPLAN works

The seven steps below are the product's own tabs. How long a project takes depends on the site.

Early feasibility without BUILDPLAN

Three tools, several handoffs
1
Collect the site factsStep 1

Address, boundary and area come out of a map tool and get retyped somewhere else.

2
Wait for a first massingStep 2

A first volume study means asking someone else to draw it, then waiting for the answer.

3
Check the code by handStep 3

Coverage ratio, floor area ratio and height limits are checked manually against the drawing.

4
Rebuild the story for reviewStep 4

The numbers live in a spreadsheet and the material for the meeting is built from scratch.

Inside BUILDPLAN

One project, seven steps
1
Start the projectProject

Create the project and open it from your signed-in account, where it stays between sessions.

2
Set the siteSite

Search an address, draw the land boundary on the map, and watch area and perimeter update as you draw.

3
Generate massingMassing

Set use, structure and floor count; setbacks are applied and the volume is built, with a violations list for coverage ratio, floor area ratio and height.

4
Ask the AIAI

The assistant reads the project's own data and drafts the proposal text for it.

5
See the buildingDesign

Generate one exterior image from the current 3D view of the massing.

6
Run the numbersFinancial

Construction cost, income and expenses, NOI, cap rate, payback period and cash-on-cash return, with charts.

7
Export the proposalExport

A PDF proposal with the generated image, ready to hand over in the same sitting.

What BUILDPLAN actually saves you

No time claims here. What BUILDPLAN removes is the switching between tools and the wait for a first massing.

One place

Map, spreadsheet and deck

Site geometry, the code check and the financial case sit in one project instead of three files

No queue

First massing

You generate the volume yourself from use, structure and floor count, instead of waiting for someone to draw it

Same sitting

Something to hand over

The PDF comes out of the project you just built, so nothing is rebuilt for the review

What BUILDPLAN does today

1

Site setup on a map

Address, boundary and live measurements

  • Search an address and centre the project on the map
  • Draw the land boundary point by point over the site
  • Area and perimeter update as you draw — area by the shoelace formula, perimeter by haversine
  • The boundary you draw is the geometry every later step works from
2

Massing from your parameters

Use, structure and floor count become a volume

  • Choose the building use, the structure (RC, S, SRC or timber) and the floor count
  • Setbacks are applied as a uniform shrink of the site polygon
  • Floor count is derived from the floor area ratio and any height limit
  • The result is a 3D massing sitting on the site you drew
3

Japanese building-code checks

A violations list, not a guess

  • Building coverage ratio (åŧšč”―įŽ‡) checked against the footprint
  • Floor area ratio (åŪđįĐįŽ‡) checked against the total floor area
  • Height checked against the generated volume
  • Slant-plane (æ–œį·š) geometry drawn in 3D at fixed 38° and 45° angles as a visual reference, not a compliance verdict
4

Financial feasibility

From geometry to a return in the same project

  • Construction cost built from the structure type and the floor area
  • Income and operating expenses, resolved into NOI
  • Cap rate, payback period and cash-on-cash return, shown with charts
  • Reference market data: a Tokyo ward rent table and yen-per-tsubo construction costs
  • The model is all-cash — financing is not part of the calculation today
5

AI, imagery and handover

An assistant that knows the project, and a PDF at the end

  • An AI assistant that can see the project's data and answer from it
  • AI-drafted proposal text written against the current scenario
  • One exterior image generated from the current 3D view
  • PDF proposal export that embeds the generated image
  • Projects saved to your account; interface in English, Japanese, Korean and Mongolian

Who BUILDPLAN is for

Developers

Test a site before committing to it: what fits, what the code allows and what it returns.

— example use case, not a customer quote

  • Screening a site before acquisition
  • Comparing what different uses and floor counts do to the return
  • Material for an internal go/no-go discussion

Planning teams

Produce a first massing and a code check in-house, before a design team is engaged.

— example use case, not a customer quote

  • A first volume study without waiting on a drawing
  • Coverage ratio, floor area ratio and height checked early
  • A starting point to hand to the architect

Landowners

See what a plot could hold and what it might earn, before talking to anyone.

— example use case, not a customer quote

  • An early appraisal of land you already hold
  • A second view on a proposal you have been given
  • A PDF to take into a first conversation

Early access to BUILDPLAN

BUILDPLAN is early-stage and prices are not published yet — commercial terms are agreed per project.

Demo

Free

We walk the seven steps on a site you choose and answer your questions on the call

Pilot project

By arrangement

We set up one of your real sites in BUILDPLAN and work it through with your team, from boundary to PDF proposal

Co-development

By arrangement

Work with us as an early partner and shape what BUILDPLAN builds next: markets, code sets and outputs

Talk to us

Frequently asked questions about BUILDPLAN

Does BUILDPLAN support Mongolian norms and tugrik?

Not yet. BUILDPLAN works to Japanese building code and yen today: coverage ratio, floor area ratio and height, with a yen-based cost and rent model. Mongolian norms and tugrik are on the roadmap. The interface is already available in Mongolian.

What is the output good for, and what is it not?

It is good for deciding whether a site is worth pursuing and for the first conversation with a partner, a lender or an owner. It is not construction documentation, not a permit submission and not a compliance certificate — a qualified professional has to verify the figures before you commit.

Which financial figures does BUILDPLAN calculate?

Construction cost, income and operating expenses, NOI, cap rate, payback period and cash-on-cash return, shown with charts. The model is all-cash today: there is no loan, interest or debt service in it.

Do I need CAD or BIM skills to use it?

No. You work from an address and a boundary you draw on the map, and the massing comes from use, structure and floor count. BUILDPLAN does not ask you to import a CAD or BIM model.

How much weight can the slant-plane view carry?

Treat it as a reference. The slant planes are drawn in 3D at fixed angles so you can see the shape of the restriction against your massing; BUILDPLAN does not issue a pass or fail on them. The coverage ratio, floor area ratio and height checks do produce a violations list.

Where does the market data come from?

BUILDPLAN ships reference figures: a Tokyo ward rent table and yen-per-tsubo construction costs by structure type. They are a starting point for a first pass, not an appraisal of your site.

Which languages does it run in, and where do projects live?

The interface runs in English, Japanese, Korean and Mongolian. Projects are saved to your signed-in account and are there when you come back.

What is planned next

Phase 2

Mongolian market

  • Mongolian building norms alongside the Japanese code set
  • Tugrik pricing and a Mongolian cost basis
  • Local rent and construction references
Phase 3

Deeper costing and financing

  • A bill of quantities generated from the massing
  • A financing model with loan terms and leverage
  • Market data beyond the Tokyo reference set
Phase 4

Sharing and scenarios

  • Read-only links for showing a study outside the account
  • Scenario variants that survive a reload
  • More export formats for the numbers behind the proposal

See BUILDPLAN on a site you already know

Bring an address in Japan and we will walk the seven steps through to the PDF proposal.

Get the catalogBook a Demo

Important notices

  • â€Ē BUILDPLAN produces a preliminary feasibility study. It is not construction documentation and not a basis for a permit submission.
  • â€Ē Every figure — area, volume, cost, rent and return — is indicative and must be verified by a qualified professional before any investment or design decision.
  • â€Ē The slant-plane display is a fixed-angle visual reference, not a compliance certificate; the coverage ratio, floor area ratio and height checks are preliminary and do not replace a formal review.
  • â€Ē Reference market data illustrates the Tokyo market and is not an appraisal of your site.