Comparing construction bids: a method to analyse the offers

Why comparing construction bids is so hard

On paper, comparing bids means lining up totals. In reality, companies rarely answer the same way: different templates, items grouped or split, lump sums on one side and line-by-line detail on the other. The amounts then no longer cover the same scope.

The risk is to pick the lowest total without seeing what it leaves out. An offer looks cheaper because an item was forgotten, an option left unpriced, or a service dropped from the scope. Until the bids are brought back onto a common basis, the comparison stays misleading.

• Different templates: each company structures its quote its own way.
• Non-comparable scopes: a lump sum against a line-by-line breakdown.
• Forgotten or unpriced items that lower a total artificially.
• Out-of-scope services added or removed without being clearly flagged.

The pricing breakdown, the common basis for comparison

The priced breakdown (DPGF) is the key to a fair comparison. It is a priced template, organised by package and by item, that you send to every consulted company. Each one prices the same breakdown, line by line.

When every offer rests on the same breakdown, you really do compare the same thing: item by item, package by package. Gaps become readable, omissions stand out, and a low total is explained by a price, not by an oversight. The breakdown turns a pile of heterogeneous quotes into a comparable table.

Analysing the offers, step by step

A reliable analysis follows a logical thread, from scope to detail.

• Check the scope: does each offer really cover every expected package and item?
• Bring each quote back onto the breakdown template, item by item, to neutralise in-house templates.
• Spot unpriced items and omissions: an empty line is not a free line.
• Compare package by package and identify the best value, not just the lowest bidder.
• Measure the gap to the forecast budget to position each offer.
• Document your analysis and keep a version of it before you decide.

What to check before you choose

A well-built comparison does not mechanically point to the lowest total. A few reflexes avoid nasty surprises at award time.

• Unpriced items and omissions: a low total often hides a missing service.
• Best value over lowest price: weigh technical consistency and reliability, not only the figure.
• Gap to budget: an offer well below the estimate deserves as much attention as one too high.
• Out-of-scope quotes: spot the services added or removed that distort the comparison.

Tooling the comparison with BuildOS

Redoing this work in Excel means piecing together offers built on different templates and hoping nothing was missed. A dedicated tool starts from the same breakdown for every candidate, which makes the offers comparable from the moment they arrive.

In BuildOS, the quotes you receive come back on the breakdown sent out for consultation. The comparison shows, package by package, each company's amount against the works budget, the best value, omissions and unpriced items, out-of-scope quotes and the gap to budget — down to the per-item detail. You decide on figures, and the saved version keeps a record of your analysis.