☎ +33 (0)1 87 66 00 65 · Monday to Friday, 9am–6pm Discuss your project

We build Agents. You build the Future.

● Business offer — Construction & public works

The AI agent for construction: win the tenders, keep the site moving

Answering tenders, finding the right standard or building code, tracking interim payment applications and chasing unpaid bills: these tasks take up your best people — estimators, site managers, directors — without building a single wall. Your AI agent absorbs that repetitive, document-heavy work. Hosted in France — on local inference or an isolated resource — your prices, your margins and your technical bids stay under control. The professional keeps the decision.

Updated on

Deployed in a few weeks
Site & tender assistant · hosted in France

Fictional simulation — not a client result

We're bidding for the "school group refurbishment — structural works package". Draft the technical bid from our track record and flag anything missing from the tender documents.
Tender documents analysed (specifications, contract terms, drawings). Technical bid pre-drafted from 3 comparable projects in your records: method, phasing, people and plant, environmental approach.
2 points to watch: the specification requires low-carbon concrete (not standard in your track record) and the stated construction period looks tight against the programme supplied.
⛓ Source · the tender documents + your project records
What does low-carbon concrete change for our pricing and our supporting documents?
Impact identified: higher material cost and a specific lead time; the product's environmental declaration must be attached, along with a note on the reduction in footprint. Recommendation: price it as a variant and document the carbon saving, which often scores under the environmental criterion.
I am preparing the outline of supporting documents for the estimator to complete.
✎ Action · outline ready for review — the estimator approves
Data hosted in France · sovereign model as an option
Data hosted in France
Hosted in FranceAI model called at its publisher, except with the Sovereign model option
Prices & bids protected
GDPR & AI Act: governed deploymentTraceability & human oversight
TurnkeyDesigned, installed and operated for you
The professional decidesThe agent carries out what you have authorised

For an organisation established outside the European Union, the law of its own country applies; at its request, we put equivalent safeguards in place (human review before any action, a log of the criteria, information for the people concerned).

✦ In brief

In a construction and public works business, a Blue Lemon Agent agent automates the repetitive, document-heavy tasks — tender responses, technical bids, searching standards and building codes, subcontractor invoices, interim payment applications and chasing unpaid bills — and takes requests from the site on your written channels. VoIP telephony is not included: the voice channel is sold separately, as an option, carried by the voice agent for the telephone switchboard. Data hosted in France; the AI model is called at its publisher, except with the Sovereign model option. With that option, your prices, your margins and your know-how are never exposed to a foreign service, architecture designed to reduce exposure to extraterritorial legislation, location alone not being enough to guarantee immunity. The time won back goes into pricing and running the site. Live within a few weeks.

2 days → 30 min
first draft of a technical bid (illustrative)
100%
hosted in France in the target architecture
0
transfer outside the EU with the Sovereign model option (target architecture)
2
uses ready to deploy for the business

Illustrative markers describing our offer — to be confirmed by a pilot on your sites.

Indicative estimate, to be confirmed by a pilot on your real files (general terms of sale, article 4).

Pricing

Three options, one agent

An agent for tender responses and site follow-up on your written channels, voice as an option, installed and operated for you. Choose according to how you work. Prices exclude VAT — annual subscription, the time it takes for the gains to settle in.

Agility

Setup + controlled subscription

2,040 € excl. VAT setup
then 249 € excl. VAT/month — you invest at installation and pay a reduced subscription. Ideal for keeping the cost under control over time.
  • Installation, configuration and training for your teams
  • Operation, human oversight, updates and support
  • Hosting in France, a dedicated and isolated resource
Order →
The simplest Serenity

All inclusive, no setup fee

364 € excl. VAT /month
all inclusive, immediate start. No upfront investment: a single subscription. Ideal for starting quickly and simply.
  • Setup included (installation, configuration, training)
  • Operation, human oversight, updates and support
  • Hosting in France, managed end to end
Order →
100% Sovereign

On site, you own it

3,810 € excl. VAT setup
then 349 € excl. VAT/month · + hardware from 1,058 € (one-off purchase, in addition) — a sovereign computer installed on your premises, maintained remotely. Models run locally, your data returned at the end of the contract.
  • Hardware installed on your premises (you own it)
  • French / European AI models run locally
  • Secure remote maintenance (Pro support included)
Order →
Included in the package: hosting and AI consumption up to the volume of your capacity tier, in documents, exchanges, tokens and storage; beyond that, re-invoiced at real cost with no margin, tracked in your client area as usage statements are issued. Maintenance and supervision subscription for an initial term of 12 months for the Agility package, 24 months for the Serenity package and 36 months for the 100% Sovereign package, renewable; support levels (SLA 72 h / 24 h / 4 h) optional. Bespoke development, additional integrations or exceptional volumes are quoted separately. Support Monday to Friday, 9am to 6pm. Prices exclude VAT.
AI model: none of the AI models offered currently carries a fixed surcharge. When the selected model carries a cost, that cost is shown when you choose it, before you order, and re-invoiced at the cost incurred, with no mark-up; usage is billed at the publisher's price. Publishers' prices are published in US dollars: the amount re-invoiced is the amount in euros actually borne by Blue Lemon Agent on the publisher's invoice, at that invoice's exchange rate, with no commission or mark-up.
Included components and additional components Components included in the base offer: the Blue Lemon Agent software foundation, the AI models listed in the order journey, the standard channels (Microsoft Teams, Slack, WhatsApp Business, email, website chat, calendars, Microsoft 365 / Google Workspace, file storage, market VoIP telephony, professional social-media pages and accounts, Google Business Profile), hosting for the package chosen, in France by default, backups, supervision, updates and support. If adapting the AI agent to your constraints, your needs or your requests requires other paid components — a third-party publisher's software licence, paid API access to one of your applications, hosting of health data, for which French law requires an HDS-certified host (art. L. 1111-8 of the French Public Health Code), SecNumCloud-qualified hosting, a speech synthesis service, particular hardware —, they are offered to you as an option or on quotation and re-invoiced at the cost incurred; nothing is committed without your written agreement. Where the artificial intelligence model you choose entails an additional cost, that cost is shown to you before you order and re-invoiced to you at the cost incurred, with no margin.
What to expect
Go-live 2 to 3 weeks
Agent designed, channels connected, team trained.
Steady state 4 to 7 weeks
After a few weeks of real use, once the agent's behaviour matches what you expect. Indicative estimate, adjusted to the options you keep. It is not a delivery commitment.
Use cases

The uses of AI in a construction business

What the agent does in a construction business, and the neighbouring agents we deploy for the rest. The agent carries out by itself what you authorise it to do; you decide what it does on its own and what it submits to you.

Included in your agent The 2 capabilities essential to this promise are included, at no extra cost.
From 249 € excl. VAT / month

Reception & coordination

Taking and directing requests from suppliers and trades on WhatsApp Business, your website chat or by email, and warning the next trade when a slot moves. Answering the phone is sold separately, as an option, with the voice agent for the telephone switchboard.

Qualifying enquiries

Qualify incoming quote requests, filter out what is off-target and schedule technical visits.

Controls and safeguards These 2 controls are built into the agent: they frame what it does, whatever plan you pick. They are not chosen and are not added to your order.
Human oversight, costs, quality, incidents and safe stop Explain alerts, scenarios and operational trade-offs
What the agent must be connected to These 3 connections are required for the agent to work. They concern your information system and are scoped during the audit.
Handoff contracts, least-privilege permissions and shared context Connect ERP/WMS/MES/IoT without creating double entry Honour constraints, statuses, approvals and error recovery
Other needs our agents cover Each card says how the matching agent can be obtained today: available, on quote, or not yet in the catalogue.

Aftercare once handed over

Handle recurring questions on clearing snags and under the first-year defects warranty, and the status of a call-out.

Available View the agent page →

Need to go further?

These agents handle a different business process, with their own owner and their own price. They are added to this one.

Site accounting

Prepare entries, matching and cost tracking site by site to steer the real margin — proposed, for approval.

Accounting agent (summaries, anomalies) from 406 € excl. VAT / month Accounting agent →

Recurring appointment scheduling assistant

Diary, reminders.

Recurring appointment scheduling assistant from 244 € excl. VAT / month Discover the agent →

Simple quote generation agent

Catalogue, PDF template.

Simple quote generation agent from 283 € excl. VAT / month Discover the agent →

Purchasing / supplier agent (quotes, follow-ups)

Supplier base, workflows.

Purchasing / supplier agent (quotes, follow-ups) from 259 € excl. VAT / month Discover the agent →

Logistics / round planning agent

Constraints, simple optimisation.

Logistics / round planning agent from 283 € excl. VAT / month Discover the agent →

Technical support & documentation

Tier-1/2 technical helpdesk and documentation kept up to date from the code.

Technical support & documentation from 344 € excl. VAT / month Discover the agent →

AI agent for tenders

Responding to a tender takes days of work: going through the specifications, writing the technical submission, gathering the documents, meeting tight deadlines.

Tender response agent (drafting) from 354 € excl. VAT / month Discover the agent →

AI knowledge base agent

The information exists in your company — but it is scattered across procedures, contracts, an intranet and the memory of a few people.

Document agent (FAQ, knowledge base) from 353 € excl. VAT / month Discover the agent →

AI agent for invoice processing

Entering, matching, getting approval, paying: processing supplier invoices is a repetitive, high-volume process that invites mistakes.

Automated invoice processing agent (P2P) from 506 € excl. VAT / month Discover the agent →

AI agent for debt collection

Late payments weigh directly on cash flow, and chasing is a task nobody enjoys — so it often gets put off, forgotten, or done clumsily.

Debt collection agent (multichannel sequences) from 307 € excl. VAT / month Discover the agent →

Qualifying sales emails

A sales enquiry handled the next day is often worth less than one handled within the hour.

Sales email qualification agent from 259 € excl. VAT / month Discover the agent →
Does your need fall outside this?

In 30 minutes we identify the most relevant agent — without oversizing the project.

Build your agent
Demonstration

See the agent at work

4 everyday situations, taken from those that come up most often. Pick one: the exchange unfolds as it would in your organisation.

A scripted demonstration. These exchanges show how the agent behaves — its sources, its refusals, what it leaves to your teams. Nothing is sent from this page, no model is queried here, and the matters named are fictional. That is precisely what we promise your data. The behaviours shown here — monitoring, automation rules, routing and reminders — are configured with you during deployment, from your tools, your rules and your thresholds. The architecture points named in these exchanges — location, local execution, isolation, encryption, role-based access, logging — are not a guarantee attached to the demonstration: they are those of the architecture set out in your quotation, and verified before commissioning.

Site & tender assistant · hosted in France

Fictional simulation — not a client result

Four flags this morning, with no request from you.
· A subcontractor has been working on the Verne site for 12 days without the client's acceptance. The declaration went out on 24/07, it has not come back accepted, and the site records show their crews on site since the 27th.
· Interim application no. 7 on the Aubel site has not been submitted. The period closed six days ago; €84,200 is not in the payment cycle.
· The defects liability period on the Mareuil site expires in 21 days and three snags are still open.
· A second subcontractor's compliance certificate expired on 31/07. They work on two sites. morning-watch_4-flags.pdf4 flags · site and amount
⛓ Source · subcontract declarations, site records, applications, handover minutes, supplier documents
The Verne subcontractor is declared, though.
Declared, yes. Accepted, no — and those are two different things.
What I have established, document by document: the declaration went out on 24/07, the client acknowledged it on 25/07, and no acceptance, and no approval of payment terms, has come back. Site records place their crews on site from 27/07: twelve days.
What that means in practice: until acceptance is secured, the subcontractor has no right to direct payment, and the main contractor remains solely liable to them. If the job goes wrong, you are the one paying twice.
What I have already written: the chaser to the client, with the dated chronology of the documents — declaration of 24/07, acknowledgement of 25/07, first site record of 27/07 — and the acceptance form ready to be returned signed; and beside it, the letter informing the subcontractor of their position, ready to go the day you judge they should know.
The clock, meanwhile, is running: twelve days today, and every further day of work without the act adds to what you carry alone. The decision stays a site decision, and it is yours: stopping a crew has a cost, a programme and a person on the other side, and it is signed for. You read, you sign — the chaser goes out within the minute. acceptance-chaser_subcontractor.pdfChronology · form to return signed
⛓ Source · declaration of 24/07, acknowledgement of 25/07, site records
How did you spot all that? And who do you tell?
I watch, continuously, what you have opened to me: subcontract declarations and their return, site records, the applications calendar, handover minutes and liability periods, everyone's certificates. A document that went out and never came back, a crew on site without its paperwork, a period closed with no application, a liability period nearing its end — I say so, I do not wait to be asked.
Routing follows your organisation: the unaccepted subcontractor to the site manager and the director, because it is a company risk and not a site matter; the application to the site manager, copied to accounts; the snags to the manager of that site; the certificate to the office manager, who chases it.
With a chase: 24 h on the subcontractor and the application — one gets worse every day, the other shifts your cash position by a month; 72 h on the rest. Then a weekly summary to the director: by site, never by person.

What this morning has already given you: €84,200 put back into the payment cycle with application no. 7 ready to submit, twelve days of unaccepted subcontracting stopped dead, backed by the paperwork timeline and the acceptance request to be returned signed, three snags brought back inside the 21 days left before the liability period ends, and an expired certificate chased on both sites concerned.
From tomorrow: a month of cash that does not slip, and a company risk closed before it makes you pay twice. What I do not yet execute is not a prohibition, it is a mandate that has not been given: submitting an application, chasing the client in your name, stopping a crew — you set the scope and the cap, you date it, you withdraw it on a word, and execution takes minutes. Your prices and your paperwork never leave the company: I open what you open to me, site by site, and every look-up is logged.
The next step is ready: application no. 7 and the acceptance chaser await your reread. Say “send” and both go out before noon.
✎ Proposal · watch and chases to be configured — you set the thresholds
And the phone? We miss calls all day while we are out on site.
The phone, I do not pick up — and I say so before you start counting on it.
I take your requests on your written channels: WhatsApp Business, your website chat, email. VoIP telephony is not included: the voice channel is sold separately, as an option, carried by the voice agent for the telephone switchboard. Until it is ordered, someone in your office answers the calls, and nothing below says otherwise.
What your call log shows, and I stop at the finding: 128 calls unanswered out of 412 over six weeks, or 31% — mostly between 07:00 and 08:30 and between 12:00 and 13:30, the two windows when the site manager is out on the works. I measure it, I do not fix it.
What I handle meanwhile, because it is written down: 312 requests came in over those same six weeks through WhatsApp Business, the website chat and email. 274 went back out with no one involved, the answer being in your programmes:
· 131 supplier requests — delivery slot, site access, clearance under the crane, who signs for the delivery note. The answer comes from the week's programme and the site layout;
· 79 requests from trades and subcontractors — order of works, progress of the trade ahead of them, contact details of the foreman on site that day;
· 44 requests from clients and homeowners — progress, handover date, what happened to a snag;
· 20 cold approaches and job applications, politely turned away and logged.
Coordination is the part that wins you hours: when a supplier moves a delivery — whether they write to me, or your site manager notes it for me after taking the call —, the knock-on is worked out against the programme and the following trade is told straight away. Over six weeks, 23 announced changes, 23 following trades told the same day — four had been, before.
38 requests were passed up to a person, and that is the right number: accident, stoppage, dispute, anything that binds the company. They go to the site manager, with the request summarised and the file opened.
A rule added in week 2, and it has held since: two of your projects share a street name, and seven requests suffered for it. I now ask for the job number or the client's name before routing: every request has gone back to the right site for four weeks.
For the 128 missed calls, two paths, and the choice is yours: announce your written channels on your telephone greeting, which moves part of the volume without adding anything to what you pay here; or order the voice agent for the telephone switchboard, which picks up, and which is billed separately. The second does not start without your order, and I will say so again every time the question comes back.
⛓ Sourced · call log, requests received on your written channels, site programme, contacts book
And the quote enquiries coming in — we still sort those by hand.
Not for the last six weeks: qualifying enquiries has been running over the same six weeks as reception, and it has booked 34 technical visits.
What came in, across every channel: 96 quote enquiries — 41 by phone, logged by your office manager after the call, 38 through the website form, 17 by e-mail. What I ask each one, in the order a person can actually answer: the nature of the works, the site address, the area or the run, the date they are hoping for, the budget if they name one, whether they own the property or act for the owner, and whether an architect or a planning consent already exists — that last question alone separates a real project from a wished-for one.
What qualification returned on the 96:
· 34 within your trades and your radius → technical visit booked, with the address, the access, the floor and what to bring;
· 27 within your trades but beyond 45 km → passed to the director with the distance and the estimated value, because 45 km is not turned down the same way at €4,000 and at €90,000;
· 21 outside your trades → set aside, with the reason written down;
· 14 with neither date nor budget → chased once after a fortnight; 6 replied, and 2 of them are among the 34.
What grouping the visits changes: the 34 visits fit into 12 outings grouped by town and by half-day, against 34 separate journeys before. 22 journeys avoided, 52 minutes median travel in your records — 1,144 minutes, that is more than 19 hours handed back to your estimator over six weeks.
The figure I publish about myself: of the 21 enquiries set aside, 3 were set aside wrongly — 14.3%. A swimming-pool tiling job you do take, and two extensions filed as “steel frame” on a single word in the message. I qualified on the enquirer's vocabulary, and people rarely name a trade the way you invoice it.
What I changed, on two points: qualification now rests on your 9 trades actually invoiced over 24 months, not on the words of the message; and every enquiry set aside goes to the director in a Friday list, with the exact sentence that caused it — four lines to scan. Over the next six weeks: 18 set aside, 1 wrongly — 5.6%, caught on the Friday and signed at €14,200. qualification_96-enquiries_34-visits.pdf96 enquiries sorted · 34 visits in 12 outings · 3 wrong exclusions fixed
⛓ Sourced · 96 quote enquiries, 34 visits in 12 outings, 3 wrong exclusions out of 21 then 1 out of 18
Data hosted in France · sovereign model as an option

Your case is not here? That is exactly what a 30-minute conversation is for. Discuss your project →

How it works

The stages of your AI agent project

1

Audit & scoping

30 minutes to target the use case with the best return.

2

Quote or direct sign-up

A catalogue offer is bought online; a specific need gets a costed quote.

3

Design

We design the agent and its guardrails.

4

Integration & testing

We connect your tools to the agent, which is itself hosted in France.

5

Rollout

Going live and training your team.

6

Operation

Continuous supervision and improvement.

The context

Why AI matters to construction firms — and why they hesitate

Contracts are won on the quality of the technical bid and the accuracy of the price, but that documentary work rests on scarce people who are already stretched. And the data involved — prices, margins, know-how — is exactly what a firm does not want circulating.

! The issue

The business is caught between an exploding documentary load — bulky tender packs, standards, building codes, technical bids, payment applications, subcontractor invoices — and teams who should be on site or pricing work. Yet most consumer AI solutions amount to entrusting cost prices, margins, methods and order book to a third party, often hosted outside Europe and subject to the Cloud Act.

✓ Our answer

AI is only of interest to a construction firm if it is sovereign and confidential by design. Local inference or an isolated resource hosted in France, systematic human oversight, decisions reserved to the professional: the time saved on administration is never paid for in lost confidentiality. The aim is not to replace the estimator or the site manager, but to give them back useful time.

The decisive point

Your prices and your know-how: sovereignty & compliance

A construction firm handles the data that makes its competitiveness: cost prices, margins, methods, track record. Here is how the architecture of our agents protects it, contract by contract.

Local inference

With the 100% Sovereign package, the agent runs on a machine at the business: no tender pack and no price leaves the network, nothing passes through a cloud.

Hosting in France

Otherwise, with the Agility and Serenity packages, a dedicated, isolated resource hosted in France, under French law: data hosted in France; the AI model is called at its publisher, except with the Sovereign model option.

Reduced extraterritorial exposure

Your prices and your bids: architecture designed to reduce exposure to extraterritorial legislation, location alone not being enough to guarantee immunity.

One isolated resource per company

No pooling: your prices and your technical bids stay in an environment strictly dedicated to your company.

Encryption & controlled access

Encryption in transit and at rest, role-based access (RBAC), strong authentication and logging.

AI Act: governed deployment

The agent carries out what you have authorised; no bid and no payment is approved automatically; traceability and human oversight from end to end.

What depends on the architecture chosen These points are not general guarantees: they are settled deployment by deployment, in the quotation.

  • The applicable location is that of the architecture set out in the quotation and verified before commissioning.
  • Local execution is announced only for the configuration explicitly described and accepted in the quotation.
  • The applicable isolation depends on the deployment mode set out in the quotation; no dedicated isolation is presumed.
  • The encryption mechanisms in transit and at rest, their components and key management are those documented for the architecture chosen.
  • Roles and permissions are configured and accepted for the identities and systems actually connected.
  • The events logged, their content, their retention period and who may access them are defined for the deployment chosen.
For the most sensitive data, SecNumCloud and HDS options are available depending on your requirements. A single architecture is designed to answer both the GDPR and extraterritorial exposure. Designed for deployment in line with the GDPR and the AI Act, after the processing, roles and context-specific risks have been assessed.
The gain

How much time can a construction firm win back?

By automating the analysis of tender packs, documentary search and the tracking of payment applications, a firm can aim to halve its administrative time on standardised contracts — time reinvested in pricing and on site.

First draft of a technical bid
Today · ~2 days
Prepared by the agent, to approve
Finding a standard or a building code
Today · done by hand
Near-instant
Chasing an unpaid payment application
Today · done by hand
Automatic
Qualitative, non-contractual comparison: the proportions shown illustrate the shift of the work towards review, they represent no measurement. Every output of the agent is reviewed and approved by a competent person.
Indicative estimate, to be confirmed by a pilot on your real files (general terms of sale, article 4).
Our commitment

Four guarantees that matter to a construction business

With 100% Sovereign, your prices and your bids never leave the businessData hosted in France on an isolated resource; the AI model is called at its publisher, except with the Sovereign model option. With that option, no tender pack and no cost price entrusted to a foreign third party.
Data in France, under French lawYour prices and your bids: minimisation and location in France, architecture designed to reduce exposure to extraterritorial legislation, location alone not being enough to guarantee immunity.
The professional keeps the decisionThe agent produces bids, outlines and summaries that can be checked; no offer and no approval is automated.
Human oversight & traceabilityMonitoring and logging frame the tender responses.
Frequently asked questions

Your questions, our answers

Can AI really help answer a tender?
Yes, to a large extent. An AI agent analyses the tender pack (specifications, contract terms, drawings), checks the documents required, spots the points to watch and pre-drafts the technical bid from your past project records. The estimator moves from writing to reviewing and deciding — far quicker, and worth far more.
Are my prices and my methods protected?
Yes. Cost prices, margins and know-how make your competitiveness: our agents run locally within the business or are hosted in France, with the deployment objective of processing and access operated within the European Union and an architecture designed to reduce exposure to extraterritorial legislation, location alone not being enough to guarantee immunity.
Does the agent know the current standards and building codes?
It relies first on your internal documentation and your track record, then on the bodies of standards you supply to it. It finds the right reference in seconds, but it remains a support: final compliance is always decided by a professional.
Does AI help with mandatory electronic invoicing?
Yes. Receiving electronic invoices becomes mandatory for every business on 1 September 2026, and issuing them becomes general by 1 September 2027. An AI agent uses the structured data in subcontractor and supplier invoices to automate checking, integration and reconciliation site by site.
How do our teams and our clients talk to the agent?
From the tools they already have. Your site managers and your design office query the agent from Microsoft Teams, Slack or their email. Your clients, your project owners and your subcontractors reach it on WhatsApp Business, your website chat or by email — with no account to create and no app to install. WhatsApp Business is especially useful on site, where it is already the everyday tool. VoIP telephony is not included: the voice channel is sold separately, as an option, carried by the voice agent for the telephone switchboard. These connections rest on open standards, including the MCP protocol, and are included in every plan, at no extra cost, within the number of connections set out in your agent's quote; the catalogue grows without a surcharge. Only the fees charged by third-party platforms — WhatsApp Business bills per conversation — are passed on to you at cost, without margin, outside the subscription. You keep oversight from a web dashboard.
Do we have to change our management or quoting software?
No. The agent connects to your existing tools (quoting and site software, accounting, document management, the invoicing platform) and complements them, with no migration imposed. We adapt the integration to your environment.
Do you have to be a large firm to take this on?
No. The offer suits a sole trader or a small building firm as well as a general contractor with several branches.
How long does it take to deploy an agent?
A few weeks as a rule, after a 30-minute meeting with our sales team that identifies the use case with the best return, then a phase of design, integration and testing before going live and training your teams.
Let's talk

Let's size up the potential in your business

30 minutes to identify the use case with the best return — hosted in France, supervised, with no commitment.