Lexbau
DE
Quality management for infrastructure construction

Send your final invoice on time.
With complete project documentation.

Lexbau reads the bill of quantities, technical specifications and contracting authority requirements and turns them into a task list: every obligation with its source in the contract, the document required and how often it is due. Every proof document from the site lands on its task. Your documentation is complete at handover, and your final invoice goes out without queries.

I am a …

Contractor Complete proof, so your final invoice goes out on time Contracting Authority Every required proof document at handover
Rebar, bay 3 inspected before the pour
Concrete delivery note C35/45 8 m³ · matched to the pour
Concrete pour log, bay 3 still missing

Supported by

UnternehmerTUM Manage and More TUM Venture Labs EXIST German Federal Ministry for Economic Affairs
Today

The list of required proof documents is scattered across many contracts and specifications.

Some are listed in the bill of quantities, some in the preliminary notes, the rest in the technical specifications, contracting authority requirements and change orders. Site management has to piece the full list together themselves.

01 Project start

The obligations are spread over hundreds of pages of bills of quantities, technical specifications and change orders.

At the start of construction, it is unclear which proof is required.

02 Construction

Reports, photos and delivery notes are created in the office, in the site container and on site phones.

They end up in five places. Some of them get lost.

03 Handover

Only now does anyone check whether everything is there and whether it meets the requirement.

Now the gaps show. Often it is too late to fill them.

The result

Handover slips, retentions stay withheld, the final invoice sits unpaid. And people come back from their next site to fill binders.

From contract to task

Lexbau reads the contract and turns it into tasks.

An obligation is rarely written down in just one place. Lexbau finds the passages in the bill of quantities, preliminary notes and technical specifications, combines them into one task and keeps the source. Every task can be traced back to its line in the contract.

Example from an underground cable project, anonymized.

Task in Lexbau

Compaction proof per trench section

4 passages · 3 documents

Before backfilling, prove the formation at EV2 ≥ 45 MN/m², compact the trench in layers to DPr ≥ 97 % and document the compaction with test reports, tested to ZTV E-StB.

Sources BoQ 1.2.1.80 · 1.2.1.170Preliminary note 4.1ZTV E-StB
Owner: Site foreman Deadline: before backfilling, per section
Task in Lexbau

Condition survey before construction starts

2 passages · 2 documents

Before construction starts, carry out a condition survey together with the contracting authority and hand over the photos, sorted by location, within 3 weeks.

Sources BoQ 1.1.2.10Preliminary note 2.4
Owner: Site management Deadline: before construction starts, handover within 3 weeks
Task in Lexbau

Drilling report per HDD bore

2 passages · 2 documents

For every HDD bore, record the installation depth every 3 m and log it in the drilling report per GW 321.

Sources BoQ 1.2.3.70DVGW GW 321
Owner: Drilling supervisor Deadline: per bore
Task in Lexbau

Landowner declaration per property

affects payment

Obtain the owner’s declaration for every property affected. Without it, the work is not paid.

Sources BoQ 1.2.3.40Preliminary note 6.2
Owner: Site management Deadline: before the final invoice
One platform

One task list, from the site to the client.

Lexbau turns the contract into tasks, and you set owners and deadlines. The site foreman uploads the proof, the contractor checks it, and the contracting authority sees the progress. Everyone sees only the lots they have been given access to.

Contracting Authority

“Am I getting what the contract says?”

  • Status across all lots
  • What is missing, before handover
  • Complete at handover
More for contracting authorities
Lot 3 · Inbox
ProofStatusReceived
Photos before backfilling — PH 07completetoday 9:42 AM
UXO clearance — PH 08completeMon
Compaction report — PH 07open–
Trench profile measurement — PH 07open–
381 of 436 proof documents · partial handover PH 07 in 5 weeks
Contractor

“What is still missing before handover?”

  • Every obligation as a task
  • Set owners and deadlines yourself
  • Proof checked against the requirement
More for contractors
Tasks · Lot 3
TaskOwnerStatusDeadline
Photos before backfilling — PH 07T. Krenzcheckedbefore backfilling
Compaction report — PH 07T. Krenzopenper layer
Trench profile measurement — PH 07S. Ahrensmissingafter trenching
UXO clearance — PH 08S. Ahrenscheckedbefore construction starts
13 open · 2 overdue
Site foreman

“What do I have to prove today?”

  • Today’s tasks on the phone
  • Fill in the report right at the task
  • Add photos and signature on the spot
9:41
← Tasks / Lot 3 — Underground cable, south section
AI Due today Photo documentation
Photos before backfilling — PH 07

Photograph the bedding, ducts and warning tape before the trench is closed.

⚡ Before backfilling BoQ 1.2.1.150 T. Krenz
Add entry
Date today, 9:42 AM
Station km 81.6 – 81.9
Trench depth 1.20 m
Bedding Sand 0/2 ✓
Ducts 3 × OD 160 ✓
Warning tape laid ✓

Photos (2)

Photo
Signature · T. Krenz, site foreman
Save (2 photos)
Tasks Submissions More
From proof to handover

Fewer follow-up requests. Faster handover. Paid sooner.

You see it in four places on the project.

01

Handover without follow-up requests

What is missing shows up during construction. At handover, the package is complete the first time.

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