What is bid comparison in construction?
Bid comparison in construction is the side-by-side evaluation of several bids from suppliers or subcontractors for the same tender, line item by line item. The goal is a bid tabulation that shows who offers which line item at what price, where line items are missing and which bid is the most economical overall.
Scalera provides multi-agent AI for the construction industry back office. For contractors, installers and distributors, Scalera automates the request-for-quotation process that every bid comparison builds on, with Supplier Matching.
Why is bid comparison so time-consuming?
Because every bid looks different. One supplier sends a PDF, the next an Excel list, a subcontractor replies directly by email. Item numbers, units and descriptions differ from your own bill of quantities, and with 20 to 100 requests per tender, a lot of documents pile up.
Then there is the groundwork: before anything can be compared, the bill of quantities has to be split by trade, sent to the right manufacturers and subcontractors, and the responses have to be tracked. This coordination alone costs estimators several hours per tender.
Where do errors occur in manual bid comparison?
Errors occur wherever data is transferred by hand.
Missing line items: A bidder leaves out a line item or only offers it as an alternative. In an Excel comparison this is noticed late, and the seemingly cheapest bid suddenly turns out to be incomplete.
Differing quantities and units: m² instead of pieces, a lump sum instead of a unit price. Without a clean reference to the bill-of-quantities line item, you end up comparing apples with oranges.
Missing responses: Bids arrive late or not at all. Anyone who loses track compares too few bids or misses the submission deadline.
How does automated bid comparison work in practice?
Automated bid comparison follows the bill of quantities: first the line items are assigned to the right bidders, then structured requests go out, and incoming bids are mapped back to the same line items.
Scalera analyses the bill of quantities (VOB, NPK, ÖNORM) and identifies which manufacturer or subcontractor fits which line item, taking framework agreements, regional responsibilities and preferences into account. From this assignment, Scalera creates ready-to-send requests for quotation with a structured line-item overview and all relevant attachments. Scalera then tracks the responses and sends automatic reminders for missing bids.
Scalera reads incoming bids from PDF, Excel and email, maps every line item to the bill of quantities and automatically creates the bid tabulation from them, including flags for missing prices, lump sums and outstanding responses. Product Matching shows how line items are matched cleanly even across large product ranges.
A bid becomes comparable not when you read it, but when you request it: ask in a structured way and you get comparable answers.
What does a bid tabulation look like in practice?
Example: tender for a residential development, shell construction. Fictitious figures for illustration, unit prices in CHF.
| Item | Work | Quantity | Bidder A | Bidder B | Bidder C |
|---|---|---|---|---|---|
| 211.110 | Excavation | 420 m³ | 38.50 | 41.00 | 36.80 |
| 241.310 | Concrete C30/37 | 185 m³ | 245.00 | 238.50 | 251.00 |
| 241.420 | Wall formwork | 960 m² | 62.00 | missing | 58.40 |
| 241.610 | Reinforcement B500B | 24 t | 1,980.00 | 2,040.00 | 1,955.00 |
| 241.810 | Waterstop | 140 m | 28.50 | 31.00 | Lump sum 4,200.00 |
| Total | 172,525.00 | incomplete | 169,075.00 |
At first glance, Bidder C is the cheapest, but prices the waterstop as a lump sum instead of per linear metre; check whether the lump sum covers the full quantity. Bidder B is not comparable without formwork: without this line item, its total is CHF 114,642.50; with formwork at A's price it would be more expensive than both competitors, and at C's price still more expensive than C. A clean bid tabulation flags exactly these gaps and lump sums before negotiations begin.
How do you evaluate bids beyond price?
The lowest total is not automatically the best bid. Evaluate bids using a weighted matrix that you define before the comparison, so the award decision stays traceable.
Example weighting:
| Criterion | Weight | What to look for |
|---|---|---|
| Price | 50 % | Total after adjusting for gaps and lump sums |
| Quality / references | 25 % | Comparable projects, experience, qualifications |
| Schedule | 15 % | Availability and adherence to the construction programme |
| Reservations | 10 % | Exclusions, conditions, deviations from the bill of quantities |
Adapt the weighting to your project. What matters is that all bids are evaluated against the same criteria and every score can be traced back to the bid.
What does the AI handle, and what does your team decide?
The AI handles the structured groundwork: assigning line items, creating and sending requests, monitoring responses. Your team reviews and decides.
The award itself stays with people. Your estimators assess unclear reservations, alternative line items or differing terms, and your team chooses the bidder. The gain is that this decision is made on a complete, traceable basis instead of a hastily maintained Excel sheet.
What should you look for when choosing a solution?
Test a solution with a real, completed tender and compare the result with your manual bid tabulation. Then check five points:
- Does the solution understand your bill-of-quantities formats, such as NPK, ÖNORM or VOB?
- Are manufacturers and subcontractors assigned according to your actual purchasing strategy, including framework agreements?
- Are responses monitored, and are there automatic reminders for missing bids?
- Can every figure in the comparison be traced back to the line item and the original document?
- Can the result be passed to your ERP, e.g. SAP S/4HANA, Microsoft Dynamics or Abacus?
Frequently asked questions about bid comparison
What is bid comparison in construction?
Bid comparison in construction is the side-by-side evaluation of several bids from suppliers or subcontractors for the same tender, line item by line item, with the goal of a complete bid tabulation.
What is the difference between bid comparison and a bid tabulation?
Bid comparison is the process, the bid tabulation is its result: a table that sets out the prices of all bidders side by side for each line item.
Can software compare bids from PDF and Excel automatically?
Yes. Scalera extracts the line items from PDF, Excel and email bids, sets them side by side in the bid tabulation line by line and flags missing or lump-sum line items. The result can be passed to SAP S/4HANA, Microsoft Dynamics or Abacus.
How do I keep track of missing bids?
Scalera tracks incoming bid responses, sends automatic reminders for missing bids and provides transparency across the entire request process.
Which ERP systems does Scalera connect to?
Scalera connects to SAP S/4HANA, Microsoft Dynamics and Abacus, among others, the latter being widely used by Swiss companies.
How much does bid comparison software cost?
At Scalera, a licence costs approx. EUR 8,000–60,000 per year, depending on volume. Plans are based on the number of requests per year and locations; see Pricing for details.
Key takeaways
Good bid comparison does not start when the bids arrive, but with the request. If you assign line items cleanly, request in a structured way and track responses without gaps, you compare complete bids line by line and award on a solid basis. After the award comes the order. Read how this step also reaches the ERP without retyping in our article Automating Order Processing. See in a demo how Scalera maps this process to your own bill of quantities.