Lexbau
DE
For contractors

Complete proof.
Final invoice on time.

One missing proof document holds up handover, and with it your final invoice. Lexbau knows the contract requirements, matches incoming proof documents to them and shows what is still missing while you are still building. At handover everything is there, and your site managers have long since moved on to the next site.

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Features

How Lexbau helps contractors

Five features, from the first task to a complete handover package.

01

Hand out tasks

Whether released by the contracting authority or taken from your own bill of quantities: you give every task an owner and a deadline. Everyone sees only what concerns them.

  • Owners and deadlines
  • Site foremen see only their own tasks
Tasks · Lot 3 — Underground cable, south section
TaskOwnerDeadline
Compaction report, trench backfilling — PH 07 BoQ 1.2.1.170 TK T. Krenz per backfilled layer
Plate load test, subgrade — PH 07 BoQ 1.2.1.80 TK T. Krenz every 500 m
UXO clearance — PH 08 BoQ 1.2.1.10 SA S. Ahrens before construction starts
Trench profile measurement — PH 07 BoQ 1.2.1.60 SA S. Ahrens after trench excavation
4 tasks assigned · T. Krenz sees 2 of them on his phone
02

Fill in and sign digitally on site

The site foreman fills in the task form on their phone, attaches photos and signs with their own account. The signature records who signed and when, and locks the entry. It can only be changed afterwards if the signature is withdrawn. The result is a finished, signed PDF.

  • Form, photos, signature
  • Signed entries are locked against changes
  • No retyping in the office
9:41
← Tasks / Lot 3 — Underground cable, south section
AI Open Test report
Compaction report, trench backfilling — PH 07

Layer-by-layer compaction proof for the trench backfilling, DPr ≥ 97%.

⚡ Per backfilled layer BoQ 1.2.1.170 T. Krenz
Record entry
Date today, 9:42 AM
Station km 81.6 – 81.9
Layer 2 of 3
Test method Dyn. plate
Evd (mean) 38 MN/m²
DPr ≥ 97% met ✓

Photos (2)

Photo
Signature · T. Krenz, site foreman
Record (2 photos)
Tasks Submissions More
PDF created Compaction_​PH07_​Layer2.pdf with signature and 2 photos
matched Compaction report PH 07 Required 3 layers · received 2
notified S. Ahrens, project management for review
03

Proof is matched automatically

Proof documents arrive by email to the project address, from a phone or by upload. Lexbau recognizes what kind of document it is and matches it to the right task.

  • A dedicated email address per project
  • Combined PDFs are split automatically

Incoming

IMG_4127.jpg
from a phone · T. Krenz
→ Photo documentation of trench condition PH 07
Scan_DeliveryNotes_Wk39.pdf
by email to the project address · 6 delivery notes in one PDF
→ Delivery notes bedding sand
PLT_PH07_km82.0.pdf
Upload · testing lab
→ Plate load test, subgrade PH 07

Tasks

Photo documentation of trench condition PH 07 received
Delivery notes bedding sand 13 documents
Plate load test, subgrade PH 07 received
04

Check supplier invoices

Lexbau checks your suppliers’ invoices against the documents from the site, such as delivery notes and weighbridge tickets. So you see right away when 64 t of bedding sand was billed but only 58 t was delivered.

  • Discrepancies per line item
  • Delivery notes billed twice are flagged
Invoice 2026-0418 · Kieswerk Süd · Lot 3
Line itembilleddeliveredStatus
Bedding sand 0/2 overbilled by 6 t 64 t 58 t overbilled by 6 t
Crushed stone 0/45 haul road matches 240 t 240 t matches
Delivery note 7781 already on invoice 0391 12 t – already on invoice 0391
Delivered = total of the delivery notes in “Delivery notes bedding sand” and “Weighbridge tickets haul road”
05

See what is missing before handover

For every project and section you see what is complete and what is missing. Gaps show up during construction, not in the week before handover. So no missing proof document holds up your final invoice.

  • Required vs. received per task
  • Calendar shows missing daily reports

Lot 3 · 24 sections

PH 05 km 77.8 – 79.5 8 / 8
PH 06 km 79.5 – 81.3 6 / 8
PH 07 km 81.3 – 83.0 5 / 8

+ 21 more sections

PH 07 · 3 missing

Partial handover in 5 weeks

Compaction report, layer 3 T. Krenz
open
Plate load test km 82.5 T. Krenz
overdue
Trench profile measurement S. Ahrens
missing
5 of 8 proof documents complete
Security

Your data stays in Germany.

Servers in Germany

Processing and storage in German data centers.

No AI training on your data

Your documents are never used to train AI models.

Access only within the project

Everyone sees only the lots they have been given access to.

Delete means delete

Deleted projects are removed completely.

Getting started

How to get started

With your own documents from day one.

  1. 1

    Intro call

    We get to know your projects and show Lexbau on a real example.

  2. 2

    Test on your bill of quantities

    Upload your own bill of quantities as PDF, Excel or GAEB XML and see the tasks Lexbau creates from it.

  3. 3

    Pilot phase

    With your team on a running project.

  4. 4

    Rollout

    Extend it to more projects and teams.

Intro call

See Lexbau on your own bill of quantities.

We show you live which tasks Lexbau creates from your documents.

  • With your own documents
  • In the browser, nothing to install
Book an intro call
Contact

Or write to us

Questions, feedback or interested in working together? We will get back to you.

Or email us directly at info@lexbau.ai