AI Tools for Construction Estimating: Bid Checks After the Takeoff

Takeoff tools such as Kreo, Togal.AI, BuildVision, Exayard and PlanSwift produce quantities, not bid checks. Checking a finished bid is done by a general assistant, ChatGPT or Claude, given your bid sheet and the documents, plus a spreadsheet for the arithmetic. Use them to find gaps and outliers, never to generate the bid.

That surprises people who expect an AI estimator to catch everything. A takeoff tool answers "how much?" and a check answers "what is missing, and what looks wrong?". They need different inputs: the first reads drawings, the second reads your priced sheet, the specification, your subcontractor quotes and your own history. Much of what ranks for this topic is roundups of takeoff software. The sections below cover what happens after the quantities exist.

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What each tool type can check once the takeoff is finished

One name that appears in these searches deserves a precise description. Simpro describes Takeoffs as a way to mark up blueprints and count materials with a smart symbol recognition tool that reads symbols in any orientation. Its help pages mention trade symbol packs you switch on or off, multi-page plans in PDF format and a licence for each employee who uses it. That describes symbol recognition: as described, you point the tool at a symbol and it finds matches. I found no AI claim in those descriptions (I read them as quoted in search results, so check Simpro's own pages for current wording), so treat it as a counting aid and test it on your own plans.

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Takeoff and review tools compared, with list prices

Quantities come first, so here is what the main tools list on their own pricing pages as of October 2026. Several pages show a dollar sign without naming the currency, so confirm that at checkout.

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Two details change the maths. BuildVision (buildvisionai.com; an unrelated HVAC sales product uses the same name) meters AI use in tokens: 500 per page and 20 per detection, so a 50-page set with 1,000 detections uses about 45,000 tokens, before quote generation, which adds its own usage at a rate the page does not give. Its 14-day trial includes 50,000 tokens and needs a card, with the first charge on day 15, so the allowance is roughly one real set: choose the job you test on carefully. Exayard's AI credits are a monthly allowance per user, so check what happens when they run out. For the general-purpose side, list prices are about $20 a month for ChatGPT Plus or Claude Pro on an individual plan, and $20 to $25 a seat for business plans with a two-seat minimum.

A year's cost for a firm with two estimators

Per-user and flat pricing are hard to compare by eye, so here is the same sum done for every tool: two people estimating, a full year, list prices from the table above.

The spread is wide: the dearest takeoff option on this list costs about three times the cheapest, and every one of them costs several times the check. That is why the cost table never decides it alone. A tool that saves one estimator a day a week on area-heavy bids can justify the top of the range, and one that only counts symbols you could count in an hour cannot justify the bottom.

For takeoff accuracy itself, see a small firm's test of AI takeoff from drawings. The price bands across the wider market are in how much estimating software costs.

The bid we will check: a $152,048 print shop fit-out

Every figure in this bid is invented. A small general contractor has priced the fit-out of a 140 square metre print shop unit: partitions, ceilings, flooring, doors, shopfront glazing, electrical and extraction by subcontractors, a counter and decoration. The sheet looks tidy. Contingency is 3% of the subtotal and overhead and profit is 12% of the subtotal plus contingency, which gives a bid of $152,048.

The checks that follow are five gates, run in this order because each one changes what the next one sees. In every gate the assistant only compares what you give it, and every number it returns goes back through a person.

Gate 1: quantity ratios that expose a double count

Ask the assistant to test the quantities against each other, because a takeoff error can show up as a ratio that does not make sense.

Below are the takeoff quantities for a single-floor fit-out and the floor area from the drawings. List ratio and consistency checks between them: ceiling area against floor area; partition area against partition length times height; door count against the door schedule; wall area to decorate against new partition faces plus existing walls. For each, show the sum and say OK or EXPLAIN. Do not suggest rates. If you cannot test something from the data, say "cannot tell".

A typical reply passes the partition check (58 m of partition at 2.45 m high gives 142 m2), the door count (7 in the bid and 7 in the schedule) and the decoration area (284 m2 of new partition faces plus 126 m2 of existing walls gives 410). It flags one: ceilings at 168 m2 against a floor area of 140 m2, a ratio of 1.20. The estimator opens the takeoff and finds a 28 m2 store room counted twice. Taking it out removes $1,344 from the subtotal. Quantity checks can lower a bid as well as raise it, which is a useful thing to tell a doubtful boss.

The same test is the first line of defence when the quantities came from an automated takeoff rather than a person. A typical slip: the door symbol drawn in the plan legend gets counted as a real door, so the takeoff returns 8 doors against a schedule of 7. Nobody notices in a list of 140 quantities, but the count-against-schedule line flags it in seconds. Keep every ratio that passed on this job in a small table and reuse it: ceiling area no more than floor area on a single-storey fit-out, door count equal to the schedule, decoration area close to partition faces plus retained walls. A takeoff that breaks one of your own ratios gets opened before it gets priced.

Gate 2: scope gaps between the specification and the bid

This is the gate where an assistant earns its keep, because matching long passages of text against each other is what it does well. Give it the specification clauses, the bid sheet and the exclusions from each subcontractor quote, and ask it to start with a verbatim list of exclusions.

Documents follow: (1) specification clauses, (2) our bid lines, (3) the text of each subcontractor and supplier quote. Task: first quote every exclusion and qualification in the subcontractor and supplier quotes, word for word. Then list every specification requirement that has no matching bid line, and every requirement that a subcontractor quote excludes. Give the clause number and quote the words. Do not price anything. Do not add items that are not in the specification; list those separately as "questions".

Electrical quote excerpt: Includes distribution board, containment, small power, LED lighting supply and fit. Excludes emergency lighting, fire alarm modifications, any work to the incoming supply.

The result for the print shop, with the pricing done afterwards by the estimator from the firm's own price book:

Seven items, $13,096 in total. The realistic mistake to guard against is a reviewer, human or machine, ticking the electrical line because it "includes lighting" and missing the excluded emergency lighting in the same paragraph. That is why the prompt makes the assistant quote every exclusion first. Comparing sub quotes is its own skill, covered in what AI catches and misses in bid levelling.

Gate 3: rates against your own last six jobs, not the market

The assistant must never tell you what a partition costs. It does not know your crews, your suppliers or your region, and anything it offers is a guess. What it can do is compare your rates with your own history, which is real. Build a small table from your last six jobs (the tutorial on turning supplier quotes into a rate sheet shows how) and give it the bid rates beside it:

The prompt says so plainly: compare only with the table supplied, show each comparison as a sum, and answer "cannot tell" where there is no history. The assistant flags two rates. The estimator checks the job notes: there is no acoustic requirement on the partitions, so $68 is defensible, and decoration goes to $11.50. Those two decisions add $852 and $820, or $1,672. They are the estimator's decisions. The assistant's job was to point at the rates.

Gate 4: arithmetic and mark-up belong in the spreadsheet

Do not trust an assistant, or your own eyes, with a column of multiplications. Add a check column to the bid sheet:

F2:   =B2*D2-E2          (copy down: quantity times rate minus the typed total; anything but zero is an error)
E13:  =SUM(E2:E12)       (subtotal)
E14:  =ROUND(E13*0.03,2)             (contingency, if your policy is 3% of the subtotal)
E15:  =ROUND((E13+E14)*0.12,2)       (overhead and profit at 12% of subtotal plus contingency)
E16:  =E13+E14+E15       (bid total)

The doors line shows 4,840 typed against 7 at $640, which is 4,480: a transposed digit worth $360 that flows through both markups into a $415 difference in the bid. Use the assistant for the explanation rather than the sum: paste the check column and ask it to describe every non-zero difference in one line. It should also confirm that the order of mark-ups matches your written policy, because applying overhead and profit before contingency in one place and after it in another is an easy error to make.

Gate 5: the assumptions list that protects the margin

A bid that is right on quantities can still lose money on what it silently assumes. Ask the assistant to draft the exclusions, assumptions and clarifications that go with the bid, from everything found in Gates 1 to 4, and then edit it as the person who will carry the risk.

From the findings below, draft three lists for the bid cover note: assumptions (what we have assumed to be true), exclusions (what is not included), and clarifications (questions we need answered before the contract). Use plain sentences, no legal language. Do not include anything not supported by the findings. Mark any item that needs a price decision.

[paste findings]

For the print shop, the draft that came back looked like this once the estimator had edited it:

• Assumptions: the unit is empty and available for the full 10 weeks; the existing floor slab is sound and level enough for the new finish without screeding; the incoming electrical supply is adequate for the new load.
• Exclusions: fire alarm modifications (excluded by the electrical subcontractor; priced separately if the existing system needs altering); any work to the incoming supply.
• Clarifications: working hours for noisy work and deliveries; which party isolates and reinstates services; whether the shopfront glazing quote, valid for 30 days, needs refreshing if the start date moves.

Two lines in the assistant's first draft had to go. It listed "emergency lighting excluded", copied from the electrical quote, even though Gate 2 had priced emergency lighting back into the bid at $2,100; leaving it in would have told the client the item was missing when it was included. And it added "all works to comply with current regulations", a sentence that promises everything and defines nothing. Read every line of the draft against the final bid, not against the findings it was built from, and for anything that touches contract wording, ask a construction adviser rather than relying on a draft.

The ledger: what five gates did to the bid

The markup rules stay the same throughout, so each change flows through at a multiplier of about 1.15.

The firm now has a bid roughly 10% higher than the one it nearly sent, with every increase traceable to a specification clause, a history comparison or a correction. It may lose the job at that price, and that is a pricing decision made with the facts rather than a loss discovered in month three. The decision on whether to bid at all is a separate question, covered in an AI bid and no-bid screen.

Where AI misleads a bid check

• It invents rates. Ask "is $62 a square metre reasonable?" and you will get an answer with no source. Forbid outside figures in the prompt, as above.
• It fumbles sums. Multiplication on long lists goes wrong quietly. Keep arithmetic in the spreadsheet, and have the assistant describe differences, not compute totals.
• It cannot see what is not provided. An item missing from every document is invisible, which is why Gate 2 ends with a list of questions rather than assumptions.
• It misreads units. Metres, square metres and linear metres get confused when a column header is missing. Label every column and make it echo the units back.
• It says "looks fine". A clean report is not a clean bid. Spot-check ten lines yourself before you rely on a clear result.

Rates and margins are the most sensitive data you hold, so use a business plan with no-training defaults, strip client names and use a job code. If the check starts from drawings rather than a priced sheet, ChatGPT for construction estimating: check a quote, do not write it covers the quote-checking side in more depth, including a version for supplier quotes.

Proving the five gates on two bids you have already built

Before you trust the routine on a live tender, run it on two old bids whose final accounts you know: one job that made its margin and one that did not. The finished job is the answer sheet. Every extra you could not recover, every rate that came in high and every item the client said was "obviously included" is something the gates should have flagged.

Say the job that lost money carried four unpriced items that surfaced on site, worth $9,400 between them: builder's work for services, making good after strip-out, a fire-stopping package and protection of the common areas. A retrospective run flags three of the four ($7,100), misses the fire-stopping because the specification described it under a heading the prompt never quoted, and raises five false alarms that take about two minutes each to dismiss. On the job that made its margin, it flags two small items the estimator had in fact covered inside other lines, which is a cue to label lines better rather than a failure.

Write down three numbers per bid: items caught against items known, false alarms, and minutes from start to finished cover note. If the routine catches most of what went wrong on the losing job in under two hours, run it on every bid above a size you choose. If it misses a whole class of item, as it missed the fire-stopping here, add that heading to the Gate 2 prompt by name. Repeat the test whenever you change the prompts or switch assistant.

Questions to ask a vendor, and a trial that tells the truth

1. Does the tool check my priced bid, or only my quantities?
2. Can I export quantities with units to my own sheet as CSV or XLSX?
3. How is AI use metered, and what happens when the allowance runs out?
4. Are my drawings and rates used to train models, and where are they stored?
5. What accuracy figure do you have, on what test, and may I run my own plans?
6. What happens to my assemblies and data if I cancel?

Then run the trial on three finished jobs for which you know the real quantities, not on a brochure project. Record the error per line and per trade, the time the takeoff took and how many corrections you made. PlanSwift's 14-day trial includes its AI tools, and BuildVision's token allowance covers about one set, so plan the order of your test jobs. Write the results down and make the decision on the numbers.

What a small contractor should try first, by bottleneck

The order matters: fix the checking before you speed up the takeoff, because a faster takeoff feeds more errors into the same gaps. A takeoff tool then earns its subscription once the check is stable, and you have a way to prove it works.

Questions about AI bid checks

Can ChatGPT or Claude generate a construction bid?

They can produce numbers, but they do not know your costs, your crews or your sub quotes, so the figures are guesses dressed up as an estimate. Use them to compare your own bid with your documents and your own history, and to explain arithmetic. The estimator prices the job and signs the bid.

Is Simpro Takeoffs an AI tool?

Simpro's descriptions call it a symbol recognition tool that counts the symbols you select on plans, with trade symbol packs and per-employee licences. I found no AI claim in the descriptions I could read. Treat it as a counting aid, and test it on your own drawings before you rely on its counts.

Do AI takeoff tools also check my bid?

Not in the descriptions on their pricing pages. Kreo, Togal.AI, BuildVision, Exayard and PlanSwift list takeoff and estimating features such as auto count, scale detection and quantity extraction. Ask each vendor whether it checks a priced bid or only quantities, and get the answer in writing.

How do I stop an assistant inventing unit rates?

Give it your own rate history and forbid outside rates in the prompt: compare only with the table supplied, and say cannot tell where the table has no match. Ask it to show each comparison as a sum. If a rate you did not supply appears in a reply, strike it and repeat the request.

Is it safe to put bid data into an AI tool?

Your rates and margins are some of your most sensitive data. Business plans from OpenAI and Anthropic do not train on your content by default, whereas consumer plans have a privacy setting to review. Strip client names, use a job code, and check any confidentiality clause in the tender documents first.

Further reads

• AI Estimating Software for Small Builders: Six Options Compared — Six estimating options for small builders compared
• Best AI for Quantity Surveyors: Five Tool Types Compared by Job — Five tool types for quantity surveyors, by job
• Can AI Produce Accurate Estimates for a Small Building Firm? — How accurate AI-assisted estimates can be for a small firm
• AI Estimating Software for HVAC: Replacement Quotes and Duct Takeoffs — Duct takeoff tools and replacement quote builders do different jobs. See what each does, what it misses, and how to test one on a finished duct job.
• AI Take Off Software: Trial Three Tools on One Real Plan Set — Run one past job through three AI take-off tools and score counts, scale and missed items against your manual numbers, with trial terms and prices.
• AI for Construction Contractors: Bid Invitations and Follow-Up — A working routine for a contractor's inbox: triage invitations, draft acknowledgements and clarifications with AI, then chase each bid on a set cadence.
• Best Free AI Tools for Construction: Where Each Free Tier Stops — Free AI tools a small construction firm can use today, with the exact limit on each: job cards, calls, scans, seats and chats, plus a three-month cost example.
• Bill of Quantities Template: A Worked Example Checked With AI — A worked bill of quantities with Excel check formulas and AI prompts for codes, descriptions, units and totals, with measurement left to the QS.
• AI Tools and AI Development: The Complete 2026 Guide — the AI hub, including every tutorial in the AI-for-business series.

Sources: vendor pricing pages read in October 2026 for Kreo, Togal.AI, BuildVision (buildvisionai.com), Exayard, PlanSwift, STACK and Bluebeam (pricing and Max pages); Simpro's descriptions of Takeoffs as shown in search results (its own pages would not load); ChatGPT and Claude pricing pages. The bid, rates and history in the worked examples are illustrative.