The verdict in three sentences
AI applied to construction estimating does not replace measuring or the estimator's judgement; it produces a structured draft quote in minutes from photos, voice notes and your own library of priced work items. A realistic gain is 50 to 70% of drafting time, provided every line gets human sign-off before sending. Budget sits between a simple and a medium-complexity application, plus GBP 40 to 170 or CAD 75 to 300 a month in API fees, 2026 ballpark.
Where the 12 weekly hours of estimating go
Take a refurbishment contractor in London (or Toronto), 35 staff, 2 estimators pricing 15 to 20 jobs a week for homeowners, property managers and small commercial clients. Each quote needs a site visit, photos, measurements, then line-by-line drafting in the estimating tool (a construction quoting SaaS or an in-house spreadsheet).
Drafting is the most automatable part: finding work items, adjusting quantities, writing descriptions, applying the right tax (20% VAT in the UK with reduced rates for some energy-saving works, 13% HST in Ontario).
| Task | Current time per quote | With AI assistant | Automatable |
|---|---|---|---|
| Site visit and photos | 45 min | 45 min | No |
| Measuring | 20 min | 15 min (annotated photos) | Partly |
| Finding items in the library | 15 min | 2 min | Yes |
| Writing descriptions | 10 min | 2 min | Yes |
| Quantities and prices | 10 min | 3 min of checking | Yes, with review |
| Tax rate and legal wording | 5 min | 1 min | Yes |
| Final review | 5 min | 8 min | No, more important |
Office time drops from 65 minutes to about 31 minutes per quote.
What the tool costs
The core asset is your library of 3,000 priced work items, with net costs, unit labour times and margin factors. Without it, AI would produce generic prices of no value. The tool transcribes the estimator's voice note, analyses photos (areas, materials, condition), suggests matching items and calculates a draft, exported to your quoting software.
| Item | Amount | Note |
|---|---|---|
| Kolonell simple version | 2,500,000 to 4,000,000 FCFA (3,810 to 6,100 EUR) | Voice notes, library, PDF export |
| Kolonell medium version | 4,000,000 to 7,000,000 FCFA (6,100 to 10,670 EUR) | Photo analysis, quoting software link, conversion tracking |
| Transcription and AI API | GBP 40 to 170 / CAD 75 to 300 per month (2026 ballpark) | Depends on quote volume |
| Kolonell maintenance | 35,000 / 75,000 / 120,000 FCFA per month (53 / 114 / 183 EUR) | Price updates included depending on plan |
| Construction quoting SaaS | GBP 35 to 100 / CAD 60 to 170 per user per month | Kept, the tool connects to it |
| External quantity surveyor | GBP 350 to 600 / CAD 600 to 1,000 per day | Alternative for large jobs |
Limits to know before signing
Quantities stay your responsibility. Photo analysis estimates an area within 10 to 15%. For rendering or insulation, real measurement is still required, and the tool flags any unchecked quantity in red.
The library has to be maintained. Material prices moved by several points in 2025 and 2026. Without quarterly cost updates, generated quotes drift towards thin margins.
Unusual jobs. Victorian terraces in London, century homes in Toronto, conservation area or heritage constraints: AI suggests, the estimator decides.
Conversion rate. A quote sent within 24 hours instead of 5 days gets signed more often. Refurbishment contractors typically see 20 to 30% conversion, and speed of response is one of the clearest levers for reaching the top of that range.
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Mini case study
James, estimator at the London contractor, prices 18 quotes a week across the two estimators and spends 12 hours on it. With the assistant, office time falls by 34 minutes per quote.
Calculation: 18 × 34 min = 612 min, so 10.2 hours recovered per week. Over 45 weeks that is 459 hours, which at GBP 45 loaded hourly cost is GBP 20,655 a year. On revenue, if conversion rises from 22% to 26% thanks to quotes sent within 24 hours, on 810 quotes a year at GBP 7,500 average job value, the firm wins 32 more jobs, roughly GBP 240,000 of extra revenue. Against a medium version at 7,000,000 FCFA (10,670 EUR), about GBP 1,500 of annual API fees and Standard maintenance at 114 EUR a month, the project pays back within the first season.
FAQ
Can the AI send the quote straight to the client?
No, and we advise against it. Every draft is reviewed by the estimator, who signs off quantities and prices before export to the quoting tool.
Do we need an existing library of work items?
It helps. If you have none, we build one from your last 200 to 300 quotes, which adds 2 to 3 weeks to the project.
How accurate are areas from photos?
Expect a 10 to 15% margin on a well-photographed room. The tool prepares, but real measurement is still required for items billed per square metre or square foot.
Does it connect to our quoting software?
Yes, through structured export or API depending on the software. A direct connection belongs to the medium version, 4,000,000 to 7,000,000 FCFA.
How long to set up?
Allow 6 to 10 weeks, including 2 weeks migrating the library and 2 weeks of parallel testing on real quotes.
Let's scope your project. We review your recent quotes and work item library, then deliver an estimating assistant tested on your own jobs in 6 to 10 weeks. Detailed quote within 48 h. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
