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Progetti · Supported by the European Space Agency

One certified record of every construction site.

Satellite radar watches the outside of every building, every 6 days, back to 2014. Every observation is certified and sealed: no one can alter it.

  • Third-party data
  • Retroactive to 2014
  • Certified & tamper-proof

Milan Duomo · Radar analysis

Plan of Milan Cathedral with the radar detection of scaffolding on the apse, about 600 square metres

600 m² Radar Detection

Sequence mapped: scaffolding installed and extended between 28 Jan and 21 Feb 2025.

Contains modified Copernicus Sentinel data 2025 · © OpenStreetMap contributors

The problem

Everyone pays for the same site. No one sees the same thing.

Contractors report, supervisors sample, lenders and insurers send their own inspectors. Each check lasts one day, covers one site, and is never certified or shared.

  • Contractor reports
  • Sample checks
  • Photos by email
  • Separate inspections
BUILD‑ITOne certified record, the same for everyone

What BUILD‑IT is

Evidence no one on site produces, and no one can change.

Third-party, continuous

Data from orbit, not from the contractor, the client or the insurer. A new look every 6 days, day or night, through clouds. Nothing installed on site.

Retroactive

The Copernicus radar archive starts in 2014. Check what happened before you were involved, or on the day of a claim.

Certified, tamper-proof

Every observation is timestamped and sealed in B4F's immutable registry. Nobody, including us, can change it afterwards.

How it works

From orbit to your desk, in four steps.

Radar sends its own signal: no daylight, no clear sky needed. When the outside of a building changes, BUILD‑IT sees it, dates it and certifies it.

Spotting change

Where external works appeared or ended, across the whole area.

Site timelines

Start, pause and end dates, building by building.

Site reports

Observation dates, evidence and confidence level.

Ready for your systems

CSV, JSON and GeoPackage for GIS, BI and BIM.

Proof · The Milan Duomo pilot

Tested where the answer was already known.

All of 2025, every building within 1 km of the Duomo, checked against the real renovation works. Reconstructed after the fact from the satellite archive: no sensors, no site access.

A verification campaign starts from 531 buildings, not 2,249.

Who it's for

Built for those who pay for, insure and control construction.

  • Insurers and sureties

    When did the works really start and finish?

    An immutable building history back to 2014, to check claims retroactively.

  • Banks, lenders, funds

    Is the site progressing before the next drawdown?

    Certified third-party checks on every financed site, one method.

  • Family offices, investors

    How do I follow distant projects?

    Certified timelines per asset; visits only where data disagrees.

  • Owners, contractors and professionals

    How close is reality to the schedule?

    Certified records for permits, as-built files and disputes.

  • Public bodies, infrastructure

    Were the contracted works actually done?

    The whole territory, checked against the land registry.

Why BUILD‑IT

Certified evidence, not declarations.

AspectTodayWith BUILD‑IT
SourceDeclared by the partiesObserved by satellite, independent
IntegrityEditable files and reportsTimestamped, sealed, tamper-proof
One versionEach party pays its own checkThe same record for everyone
FrequencyWhen someone can goEvery 6 days
HistoryWhatever was filedBack to 2014
Site visitsEverywhere, by defaultOnly where something changed
Set-up on siteAccess and equipmentNone

On the roadmap

Next: from the outside to the inside.

The satellite is where BUILD‑IT starts. Two optional modules will extend the same certified record.

Coming soon

Smart vest

The inside of the site, recorded by the people already walking it. No drones, no fixed cameras, faces blurred on the vest.

Coming soon

Certified photo check

A phone photo from site, cross-checked with the satellite and screened for AI editing before it enters the record.

See what BUILD‑IT would have told you about your sites.

Give us two or three large sites, open or closed. We reconstruct when external works started, paused and ended, as a certified record.

  • Works on past projects, back to 2014
  • Nothing to install
  • Certified, tamper-proof results

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B4F Innovation BUILD‑IT is developed by B4F Innovation with the support of the European Space Agency (ESA). b4fi.it

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