03Management review
Management rates the tender and decides whether to go ahead.
Management scores the tender and the risk before the team starts work.
The team only works on tenders management believes in.
COS / Design and build
When you carry both design and construction, every pricing mistake comes out of your margin. COS links the bid price, budget, orders and real cost.
Built with our first construction partners in Croatia and Serbia.

Where it gets stuck today
The price is given early and the risk stays with you until handover.
The contract price never becomes a budget and orders, so deviations show up late.
You cannot see in advance when money comes in and when it goes out.
COS · Design and build
Example from the walkthrough
On site the paver actually does 132 m²/h instead of the planned 150. COS sees it in the diary and updates 14 formulas for the next bid.
03Management review
Management scores the tender and the risk before the team starts work.
The team only works on tenders management believes in.
06Item estimate
Every item has an estimate: materials, equipment and labour.
Every item price is explained and checkable, down to the last hour.
11Bid price and submission
Price, margin and risk in one place before submission.
The bid goes out calmly, with known risks and a checked margin.
12Contract, orders, stock
The won bid becomes budget, orders and stock.
What you bid is what you order and track.
20Cash and feedback loop
Cash flow by month and real cost back into the formulas.
The company learns from every site, and cash never comes as a surprise.
15Site diary
Site diary by voice or photo, even offline.
The diary is always up to date, and quantities are ready for the measurement book.
Free, no obligation
Upload the documents and BOQ of a tender you have already submitted. Within 5 working days we send back the risks COS would flag and an estimate of the key items, so you can compare them with what you submitted.
We use the documents only for this analysis and delete them on request. We can sign an NDA.
The BOQ (Excel or PDF) and documents, or just the BOQ.
Risks with the source page, revisions, estimates for the key items.
A 30-minute online meeting: your bid and COS side by side.
Your numbers
Enter your own numbers. The calculator assumes no savings rate; it only adds up the hours your team spends today on work COS does for them.
Based on 12 months, 46 working weeks and 1,700 working hours per person per year.
Show me on my own tenderSend us one past tender with its BOQ. We will show you the risks and estimates COS would produce.
Ivan Penava · founder, COS · Split, Croatia · [email protected] · +385 95 518 7272