A software decision should survive questions from operations, accounting and IT. This page names what Home Builder Software currently provides, where the boundary lies and what to reproduce in a trial or record in the written agreement.
The strongest evidence is reproducible: use one project from lead and estimate through schedule, field record, change order and invoice; then inspect the permissions, an export and the interface that matters to your company.
Product screens and documentation show the running system. Dated release notes show when material capabilities were added. Anonymous logos, unattributed savings and invented review scores are not used as substitutes for that check.
Run one end-to-end project with the records and approval points your team actually uses.
Create a German invoice example and have accounting test the exported files before purchase.
Issue a read-only integration key, restrict a role and confirm that both the application and external access respect it.
Request the tenant data export and inspect the manifest, table files and checksums.
The table separates a present function from workflow support and from a format that is not included. Tax and contract applicability remains a decision for the company and its professional advisers.
| Requirement | Current scope | What the product does | What to verify before purchase |
|---|---|---|---|
| §13b reverse charge | Available | When the user selects the option, the invoice uses zero VAT and includes the reverse-charge notice. The software does not decide whether the case qualifies. Construction invoicing software · §13b reverse charge | Create the real invoice scenario with accounting and compare the notice, recipient and tax treatment. German VAT Act §13b |
| XRechnung 3 | Available | An issued invoice can be downloaded as UBL XML with the XRechnung 3 customization identifier. Construction invoicing software · XRechnung 3 | Validate a sample with the recipient or its current validation tool before relying on the exchange. Official XRechnung versions |
| Accounting export for DATEV | Supported with limits | The invoice list exports a semicolon-separated CSV with account, contra-account and posting-key columns. The account mapping is an example, not a direct DATEV Online connection or certified DATEV format. Construction invoicing software · Accounting export for DATEV | Have the tax adviser test one file and specify the required accounts, header and import path. DATEV file formats |
| §48b exemption certificate | Available | The subcontractor record stores the certificate expiry. Supplier-invoice approval and payment runs can be blocked when the certificate is missing or expired. There is no automatic authority lookup. Construction subcontractor management · §48b exemption certificate | Use one valid and one expired certificate and confirm the approval and payment behavior. German Income Tax Act §48b |
| VOB/B workflows | Supported with limits | Measurements, itemized progress invoices, change orders, retention and defects support common construction records. There is no VOB/B legal assessment or deadline engine. Construction quantity measurements · VOB/B workflows | Map the company’s notice, approval and documentation duties to the available records and assign legal deadlines outside the product where necessary. |
| GAEB import and export | Not included | The current product has no GAEB exchange. Estimates and bid records remain available in the product, but they cannot be transferred as GAEB files. Construction estimating software · GAEB import and export | If GAEB is mandatory, make the required exchange phases and version an explicit procurement requirement. Official GAEB exchange downloads |
| GoBD traceability | Supported with limits | Invoice number, issue date and amounts become immutable after issue; corrections use credits and activity is recorded. This supports traceability but is not a blanket GoBD certification or compliance promise. Construction invoicing software · GoBD traceability | Review retention, procedural documentation, access and export with the company’s tax adviser; software functions alone do not establish organizational compliance. German Finance Ministry GoBD notice |
| Tenant data export | Available | The complete tenant database is written as NDJSON per table with a manifest, row counts and SHA-256 checksums. Stored document binaries are not part of that database archive. Construction software settings, API and webhooks · Tenant data export | Request a sample export and agree the separate transfer of stored files for an exit or hosting change. |
Product scope checked against the application on 28 August 2026.
“API available” is too vague for a procurement decision. These are the integration surfaces present in the product and the records they expose.
Read endpoints cover projects, pipeline, defects, invoices, schedules, daily reports, documents, RFIs, change orders, payments and purchasing. Selected schedule, pipeline and defect changes have write endpoints. Keys carry read or write scope, expiry and the issuing user’s permissions; requests are limited to 60 per minute.
Endpoints subscribe to named event families such as project, schedule, invoice, payment, purchasing, defect, document and customer changes. Deliveries are HMAC-signed, logged and can be tested or retried.
A downloadable connection creates a time-limited read-only key for search, fetch and operational overviews. A separately issued write-scoped key can expose only the change actions allowed by the user’s role; company settings decide whether a change executes or waits for review.
The product exports filtered operational lists as CSV, invoices as printable PDF or XRechnung UBL XML, and complete tenant database records as NDJSON. Contact master data can be prepared for import from CSV or XLSX during setup. Each format should be tested against the receiving system.
Both operating models run the same product. The written agreement must make ownership of operation, updates, recovery and support explicit.
L&I IT-solutions operates the application, updates and backups in the European Union. The quote should name users, storage, support route and the service terms that apply to the company.
The customer operates the infrastructure, PostgreSQL database and backups. Installation, supported versions, update delivery, recovery responsibility and support are agreed with the license; they are not inferred from the one-time payment.
A tenant database can be exported as one NDJSON file per table plus a manifest with row counts and SHA-256 checksums. This covers database records. Stored document binaries need a separately planned file handover when leaving or changing the operating model.
Availability, service hours, response targets, update rights, recovery objectives, migration effort and source-code escrow are not published as universal promises. If one is a purchasing condition, it needs an explicit clause in the quote or agreement.
Home Builder Software is written, operated and sold by L&I IT-solutions GmbH & Co. KG in Weinheim. The registered company, address, telephone and register entries are published and can be checked before a trial or contract.
L&I IT-solutions GmbH & Co. KGName the workflow, German accounting requirement, interface and operating model that could stop the decision. We use those points to define a trial that produces evidence your team can review.
