AI might just be compromising your build quality, here’s how.

AI can be useful for getting a first impression of two building quotes, but it can be risky to rely on it to decide which quote is genuinely giving you better value.

The main problem is that building quotes are rarely comparing exactly the same thing, even when they are based on the same drawings.

Imagine you receive two quotes:

Builder A: £145,000
Builder B: £125,000

It is very tempting to upload both to AI and ask, “Which is the better quote?” AI may identify Builder B as £20,000 cheaper. But that doesn't necessarily mean Builder B will cost £20,000 less by the time the project is finished.

Why AI can struggle with construction quotes

1. It can compare words and numbers, but not necessarily the reality behind them.

One builder might write:

“Kitchen installation – included”

Another might provide several detailed lines covering units, worktops, appliances, plumbing, electrical connections, extraction, decoration and making good.

AI may see both as covering the kitchen. Someone experienced in construction will want to know exactly what “included” means.

2. A cheaper quote may simply contain more exclusions.

A £125,000 quote could exclude scaffolding, skips (licenses), parking tickets, structural steelwork, Building Control fees, decorating, flooring or certain electrical works.

A £145,000 quote might include them.

The first builder isn't necessarily cheaper. They may simply be telling you about some of the costs later.

3. Provisional sums can make a quote look artificially competitive.

A builder might allow £5,000 for something that realistically could cost £12,000.

On paper, their quotation is £7,000 cheaper. Once construction begins and the actual work is known, the client still has to pay the difference.

AI can identify something labelled "provisional sum", but it may not know whether the allowance is realistic for that particular property and specification.

4. Drawings don't always tell the whole story.

This is particularly important with extensions, renovations and older buildings.

Once you start opening walls and floors, you can discover rotten timbers, inadequate foundations, unusual construction methods, outdated services or previous alterations.

An experienced contractor visiting the property may notice potential issues that simply aren't contained within the documents uploaded to AI.

5. Quality isn't easily represented in a spreadsheet.

Two builders can both quote for:

“New timber flooring.”

But one may be allowing for a significantly better product, better preparation and a more skilled installation.

The description can look almost identical while the finished result and cost can be very different.

6. AI doesn't know what a builder intended unless the quote actually says it.

This is probably the biggest issue.

AI is analysing the information it has been given. If something is vague, missing or incorrectly described, AI cannot phone the builder and ask:

"When you say electrical works are included, does that include the new consumer unit, testing, certification and all the fittings shown on the electrical plan?"

Those conversations are often where the important differences between quotations emerge.

So should clients avoid AI altogether?

No. Used properly, it can actually be helpful.

AI is good at organising quotations, highlighting obvious differences and generating questions to ask each contractor.

Where we'd be cautious is asking AI:

"Which builder should I choose?"

A better question would be:

"What differences can you identify between these quotations, what appears to be missing, and what questions should I ask each builder before I make my decision?"

That turns AI into a useful assistant rather than asking it to make a construction judgement it isn't really equipped to make.

Ultimately, when you're spending £100,000, £200,000 or considerably more on your home, the important question isn't simply "Who has produced the lowest number?"

It's:

"Do these builders actually include the same work, to the same specification and standard, and how confident am I that the price I'm agreeing to resembles the price I'll eventually pay?"

That distinction can make a very significant difference to the final cost of a building project.

If you are currently looking to price a project and are wanting to organise a site visit email hannah@ireson-bailey.co.uk