About
BOB exists because building must not be a black box.
In an online survey, seven in ten home builders surveyed went over budget — not from carelessness, but because nobody keeps count while a hundred documents, three contractors and a bank all transmit at once. BOB — Back on Budget — is the tool we wished for on our own building site: a living cost plan, a guard that knows the rules, and one number that is always right.
What we hold ourselves to
No invented numbers
Every reference value on this site carries a source and date. What lacks a solid source does not appear — an honest gap beats an invented figure.
Hints, not paternalism
BOB blocks no payment and makes no decision for you. It shows rules, amounts and legal references — decisions happen at the kitchen table, not in the app.
Your data is yours
Stored in the EU (Frankfurt), fully exportable at any time, deletable at any time. Documents are not mined for ads and never sold.
Software with an end
A build ends — hence the Build Pass: pay once, 24 months of everything, no subscription tail. Tools should serve, not cling.
Editorial
How our editorial team works
- Who writes
- Guides, glossary and calculator texts are written by the BOB editorial team at KRUPKA Concept GmbH. Responsible under § 18 (2) MStV: Leon Krupka (see legal notice).
- Sources
- Every figure and every legal statement carries a source and date. For laws we link the statute; where a primary source exists we link it, and a secondary source is labelled as such.
- Expert review
- If an expert has reviewed an article, it names them with qualification and date. Where that note is missing, the article has not been externally reviewed.
- Freshness
- Every article shows when it was last updated. We check articles with figures quarterly, and we align the construction price trend with every release from the Federal Statistical Office.
- Found a mistake?
- Write to office@krupkagmbh.com. We correct the article and reset its update date.
KRUPKA Concept GmbH
BOB is built by KRUPKA Concept GmbH in Germany — focused on German construction law and cost structures, with the firm intent to keep improving until “over budget” is the exception.
Sources and dates
- POCASIO: online survey of 384 German home builders (built 2010 to spring 2022), published 11/2022 (German) — 69.3% over budgetAs of: 11/2022
General, sourced information, not legal advice.