About
BOB exists because building must not be a black box.
Seven in ten home builders blow their 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.
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.