Pro BTP · Joint ventures & public tenders
Run your construction joint ventures (co-contracting)
Co-contracting: set up a joint or several liability grouping, invite your co-contractors by registration number, split shares per lot, issue the lead contractor's invoice to the client and generate the payment-split letter for direct payment of each member. Included in the Pro BTP plan.
1 invoice
Single lead-contractor RECAP invoice to the client
≤ 100%
Shares capped per lot, checked automatically
Art. 13
Payment-split letter compliant with law 75-1334
DC1
Pre-filled collective DC1 application + URSSAF vigilance per member
The problem
Co-contracting is still run on spreadsheets and email
Bidding on a public tender as a grouping means juggling each co-contractor's share, the agreement to draft, the single invoice to the client and the payment split. Without a tool, everything is patched together by hand, late, and prone to error.
Per-lot shares recalculated by hand on every amendment
The grouping agreement drafted from a rough Word template
A single invoice to the client, but no tracking of who gets paid what
Each member's URSSAF compliance certificate tracked nowhere
Key features
The whole co-contracting cycle, from grouping to each member's payment
Joint or several liability grouping, invitation by registration number, per-lot shares, law-based agreement, lead-contractor invoice and payment-split letter — construction co-contracting handled end to end.
Joint or several liability grouping
Create a temporary grouping that is joint (each firm committed to its lot) or several liability (the lead contractor covers a member's default). Attach it to the tender at stake to centralise everything in one place.
Member invitation by registration number
Add the lead contractor and each co-contractor by their registration number. The lead contractor is validated automatically; co-contractors stay pending until they accept their invitation. One lead contractor per grouping.
Per-lot shares, capped at 100%
Assign each member its share, overall or lot by lot. Constrigo automatically checks that the shares of a lot never exceed 100%. An amendment recomputes the payments still due, without ever touching amounts already settled.
Grouping agreement (French law 75-1334)
Generate the temporary business grouping agreement compliant with French law no. 75-1334 of 31 December 1975: lead contractor's role, shares, each member's commitment. The document reuses the data already entered — no more copy-pasting between files.
Lead-contractor invoice + payment-split letter
The lead contractor issues a single (recap) invoice to the client, then Constrigo generates the payment-split letter (art. 13, law 75-1334): for each member, its share, gross amount, portion of the retention and net due. The client then pays each co-contractor directly.
Collective compliance + DC1 application
Track each grouping member's URSSAF compliance certificate (mandatory from €5,000 excl. tax, valid under 6 months) and generate the pre-filled collective DC1 — the application letter appointing the lead contractor. Note: a grouping applies via the DC1, not the DC4, which is reserved for subcontracting.
Your grouping bid, step by step
From setting up the grouping to paying each co-contractor
Grouping, invitation, agreement, lead-contractor invoice, payment-split letter, payment tracking — each step flows in Constrigo.
- Step 1
Create the grouping and attach it to the tender
Joint or several liability: the responsibility regime is set from the start
- Step 2
Invite each co-contractor by registration number and set its per-lot share
The sum of a lot's shares is capped at 100% automatically
- Step 3
Generate the grouping agreement (law 75-1334)
Each member's roles and commitments pulled from the data already entered
- Step 4
Issue the lead-contractor (recap) invoice to the client
One invoice for the whole grouping, with retention and reverse-charge VAT handled
- Step 5
Generate the payment-split letter and track payments per member
The client pays each co-contractor at its share; you track the statuses
Comparison
Constrigo vs spreadsheets and classic construction software for co-contracting
| Competitor | Limitation | Constrigo |
|---|---|---|
| Excel + Word | Shares recomputed by hand on every amendment, agreement drafted from a rough template, no tracking of who gets paid what | The amendment recomputes only the payments still due, the law-based agreement is generated from the entered data, each member's payment is tracked (pending / paid) |
| Sage · EBP · Tolteck · Obat | Stop at simple subcontracting: no operational co-contracting, no lead-contractor invoice, no payment-split letter for direct payment | Co-contracting handled natively: joint or several liability grouping, single RECAP lead-contractor invoice, payment-split letter (art. 13, law 75-1334) and direct payment of each co-contractor |
| iXbat | Back-office tool specialised in joint-venture accounting (SEP), disconnected from the tender → application → invoicing cycle | The whole grouping cycle in one flow: collective DC1 application, agreement, lead-contractor invoice and payment-split letter, connected to public tenders and included in the Pro BTP plan |
For every role in the grouping
Lead contractor, co-contractor, Pro BTP owner — each sees what matters to them in co-contracting.
Lead contractor
- Sets up the grouping (joint or several liability), attaches it to the tender and invites each co-contractor by registration number
- Generates the pre-filled collective DC1 application and the law 75-1334 agreement, without starting from a Word template
- Issues the single RECAP lead-contractor invoice to the client, then the payment-split letter; in a several liability grouping, absorbs a member's default
Co-contractor member
- Accepts its invitation and finds its per-lot share, with no ambiguity about its commitment
- Is paid directly by the client up to its share, including its allocated portion of the retention
- In a joint grouping, keeps its own invoicing and retention; its URSSAF compliance is tracked at grouping level
Pro BTP owner
- Co-contracting is included in the Pro BTP plan, with no extra module, and combines with the Public tenders module
- Shares are automatically capped at 100% per lot, an amendment never touches amounts already settled
- Collective compliance — each member's URSSAF vigilance — is visible at a glance before applying
Co-contracting for every type of construction grouping
Lotted public tender, large private project, joint or several liability grouping — Constrigo adapts to your co-contracting setup.
Lotted public tender
- Each firm carries one or more lots; shares are set lot by lot
- The collective DC1 application and each member's compliance certificates are gathered for the buyer
- The lead contractor invoices the contracting authority; each co-contractor is paid directly
Your objections, our answers
"Co-contracting works fine on a spreadsheet"
Until the first amendment. As soon as a share changes or a member defaults, you have to recompute everything without touching payments already settled, regenerate the agreement and redo the split letter. Constrigo recomputes only the payments still due, keeps settled amounts intact, and regenerates the documents from up-to-date data.
"My software already handles subcontracting"
Subcontracting and co-contracting are two different things. In subcontracting, you hold the contract and delegate part of the work. In co-contracting, several firms sign the contract together, each for its share, facing the client. Sage, EBP, Tolteck or Obat stop at simple subcontracting; operational co-contracting — lead-contractor invoice, split letter, direct payment — is left to do by hand. Constrigo handles it natively.
"We only bid on a few grouping tenders a year"
That's exactly where the error risk is highest: a setup you rarely repeat, with precise rules (per-lot share, allocated retention, direct payment under art. 13). Co-contracting is included in the Pro BTP plan, alongside the Public tenders module: you build a clean grouping even for two files a year, without starting from a Word template each time.
Verified integrations
Pappers
Member SIRET verification
INSEE
Business registry
Yousign
Agreement & DC1 e-signature
Factur-X
Electronic lead-contractor invoice
Chorus Pro
Public tender invoice filing
“We bid on two or three public tenders as a grouping each year, and every time it was the same headache: realigning the per-lot shares, redoing the agreement, explaining to the client who should get paid what. The lead contractor issues a single invoice, the payment-split letter comes out automatically, and each co-contractor is paid directly at its share. No more starting from a Word template.”
Dirigeant mandataire
Structural works company · Auvergne-Rhône-Alpes
FAQ about co-contracting and construction joint ventures
All about managing temporary business groupings in Constrigo.
A temporary business grouping (construction joint venture) brings together several firms that bid together on the same contract, each for a defined share, facing a single client. This is co-contracting: unlike subcontracting, every member signs the contract. The grouping can be joint (each member committed to its lot) or several liability (the lead contractor covers a member's default). Constrigo handles both regimes, the agreement, the lead-contractor invoice and the direct payment of each co-contractor.
A temporary business grouping (construction joint venture) brings together several firms that bid together on the same contract, each for a defined share, facing a single client. This is co-contracting: unlike subcontracting, every member signs the contract. The grouping can be joint (each member committed to its lot) or several liability (the lead contractor covers a member's default). Constrigo handles both regimes, the agreement, the lead-contractor invoice and the direct payment of each co-contractor.
In subcontracting, a single firm holds the contract and entrusts part of the work to a subcontractor, who has no direct contractual link with the client. In co-contracting, several firms are co-holders: they sign the contract together, each for its share, and can be paid directly by the client. Constrigo covers both: subcontracting in its dedicated pillar, co-contracting on this page.
In subcontracting, a single firm holds the contract and entrusts part of the work to a subcontractor, who has no direct contractual link with the client. In co-contracting, several firms are co-holders: they sign the contract together, each for its share, and can be paid directly by the client. Constrigo covers both: subcontracting in its dedicated pillar, co-contracting on this page.
The lead contractor issues a single recap invoice to the client for the whole grouping, with retention and reverse-charge VAT handled. Constrigo then generates the payment-split letter (art. 13 of law 75-1334): for each member, its share, gross amount, allocated portion of the retention and net due. The client then pays each co-contractor directly at its share, and you track the status of each payment (pending / paid).
The lead contractor issues a single recap invoice to the client for the whole grouping, with retention and reverse-charge VAT handled. Constrigo then generates the payment-split letter (art. 13 of law 75-1334): for each member, its share, gross amount, allocated portion of the retention and net due. The client then pays each co-contractor directly at its share, and you track the status of each payment (pending / paid).
It depends on the grouping's regime. In a several liability grouping, the defaulting member's share is automatically absorbed by the lead contractor, who guarantees completion of the contract. In a joint grouping, the share is reallocated manually, under your control, since each member was only committed to its share. In both cases, Constrigo recomputes only the payments still due and leaves amounts already settled intact.
It depends on the grouping's regime. In a several liability grouping, the defaulting member's share is automatically absorbed by the lead contractor, who guarantees completion of the contract. In a joint grouping, the share is reallocated manually, under your control, since each member was only committed to its share. In both cases, Constrigo recomputes only the payments still due and leaves amounts already settled intact.
Yes. Constrigo tracks each grouping member's URSSAF compliance certificate — mandatory from €5,000 excl. tax and valid under 6 months — and flags members whose certificate is missing or expired. When you apply, you generate the pre-filled collective DC1 (application letter appointing the lead contractor), with each co-contractor's compliance visible at a glance. The DC4 stays reserved for subcontracting.
Yes. Constrigo tracks each grouping member's URSSAF compliance certificate — mandatory from €5,000 excl. tax and valid under 6 months — and flags members whose certificate is missing or expired. When you apply, you generate the pre-filled collective DC1 (application letter appointing the lead contractor), with each co-contractor's compliance visible at a glance. The DC4 stays reserved for subcontracting.
Grouping and co-contracting management is included in the Pro BTP plan, reserved for the owner of the lead-contractor company. It builds on the same blocks as the rest of Constrigo (progress statements, retention, reverse-charge VAT, URSSAF compliance) and combines naturally with the Public tenders module to bid on tenders as a grouping.
Grouping and co-contracting management is included in the Pro BTP plan, reserved for the owner of the lead-contractor company. It builds on the same blocks as the rest of Constrigo (progress statements, retention, reverse-charge VAT, URSSAF compliance) and combines naturally with the Public tenders module to bid on tenders as a grouping.
À propos de Constrigo
Construction co-contracting software: manage your temporary business groupings
Bidding on a public tender or a large project as a temporary business grouping (construction joint venture) demands a rigour spreadsheets don't hold for long. You have to set each co-contractor's share, often lot by lot, draft the grouping agreement compliant with French law no. 75-1334 of 31 December 1975, appoint the lead contractor, then handle a single invoice to the client while ensuring the direct payment of each member. Constrigo brings this whole cycle into one module, reserved for the Pro BTP plan.
In practice, you create a joint or several liability grouping, invite each member by registration number and assign shares — Constrigo automatically checks that a lot never exceeds 100%. The lead contractor then issues a recap invoice to the client, with retention and reverse-charge VAT handled, and Constrigo generates the payment-split letter provided by article 13 of law 75-1334: each co-contractor sees its share, gross amount, allocated portion of the retention and net due. The client then pays each member directly, and you track the status of each payment.
Co-contracting must not be confused with subcontracting: here, all members are co-holders of the contract and sign facing the client. That is exactly what classic construction software — Sage, EBP, Tolteck, Obat — does not handle: they stop at simple subcontracting. Constrigo goes further, also manages collective compliance (URSSAF vigilance per member, DC1 grouping application) and combines with the Public tenders module to bid on tenders as a grouping. Grouping management is included in the Pro BTP plan.
Build your groupings and run co-contracting from Constrigo
Joint or several liability grouping, invitation by registration number, per-lot shares, law-based agreement, lead-contractor invoice and payment-split letter. Grouping management is included in the Pro BTP plan — no extra module to install.