Blog
Thinking on estimation, building services, and what AI actually changes.
Why we show the page
AI that produces a points schedule you cannot check is a liability, not a tool. The design decision behind Tenderfly: every point cites the page and sentence that produced it.
ReadThe anatomy of a double count
The same terminal unit appears on two drawings, gets priced twice, and nobody notices. Why double counts happen in tender estimation, and what it takes to catch them.
ReadWhat a BMS quote is actually made of
Panels, field devices, controllers, software, commissioning, graphics. The categories inside a BMS tender return, what drives each one, and where quotes usually go wrong.
ReadHow many BMS points does an AHU need?
A typical hardwired air handling unit lands between 20 and 30 points. A packaged one needs a handful. What moves the number, and the one question to settle before you count.
ReadWhy BMS estimation is still done in spreadsheets in 2026
The industry has digitised design, procurement and project management. But estimation, the step that determines whether you win and whether you make money, is still a senior person reading PDFs and typing into Excel.
ReadThe senior estimator problem
The average age of a BMS estimator in the UK is over 55. The knowledge of how to produce an accurate points schedule lives in people's heads, not in systems. What happens when that person retires.
ReadWhat is a BMS points schedule and why does it take so long
An explainer for anyone outside the BMS industry who needs to understand what a points schedule is, why it matters for pricing, and why producing one manually takes days per tender.
ReadHow AI reads a mechanical specification
A technical but accessible look at how document extraction works on real engineering documents. What the AI can do reliably, what it cannot do, and why the human estimator is still essential.
ReadComparing BMS tender returns: a guide for main contractors
When you receive three BMS quotes with three different point counts, how do you know which one is right? What to look for, what questions to ask, and how an independent scope baseline helps.
ReadThe hidden cost of not tendering
Every tender your team declines because they are busy estimating the current batch is revenue you will never see. The real cost of slow estimation is not the labour, it is the opportunities you miss.
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