Builder or project manager: which one to choose in 2026?

Single contract with a house builder or independent project management: which is the right choice for your new build project in Charente-Maritime? Both approaches have their strengths — but they do not offer the same guarantees, the same freedom of choice, or the same value for money. Here is the complete guide to making an informed decision.

Two fundamentally different approaches

Building with a house builder means signing a single contract — the CCMI (Individual House Construction Contract) — with one point of contact who manages the entire project from design to handover. It is a turnkey solution, regulated by French law, that offers a degree of administrative simplicity.

Appointing an independent project manager means choosing a different logic: freedom. The project manager designs your project from scratch, selects the tradespeople best suited to your build, coordinates all interventions and oversees the project through to handover — with no imposed catalogue, no hidden margin on materials, and no opaque subcontracting.

These two models meet different needs. The key is understanding which one matches your project, your priorities and your vision for the build.

The construction contract: legal security and a defined framework

The CCMI is one of the most legally protected contracts in French law. It requires the builder to commit to a fixed and final price, a guaranteed delivery date, a defect liability period and a ten-year structural warranty. For a first-time buyer or a client who wants to delegate all project management, it is a reassuring option.

In return, this security comes at a price — and not only a financial one. The range of plans on offer is often limited, materials are standardised and personalisation options are restricted. The builder works with its own subcontractors, over whom you have no direct oversight. And the margin built into the overall price — often between 20% and 30% — remains opaque.

Best practice: if you opt for a house builder, read the CCMI in detail before signing — particularly the price revision clauses, penalty clauses for delays and the precise list of included works. What is not written down will not be delivered.

Independent project management: freedom, bespoke design and transparency

Appointing an independent project manager in Charente-Maritime means choosing a project designed entirely around you — your constraints, your plot, your lifestyle, your architectural ambitions. No catalogue, no standard plan: every project is drawn from scratch, in direct dialogue with the client.

The project manager selects the local tradespeople best suited to each trade package — groundworks, timber frame, joinery, plumbing, electrical — putting companies in competition on the basis of precise specifications. You sign directly with each tradesperson: you know exactly what you are paying, to whom, and for what.

This complete cost transparency often allows for significant savings compared to a global contract — while achieving a far higher level of personalisation and quality.

Best practice: in independent project management, the quality of the result depends directly on the quality of the management. Choose a project manager who knows the local area, its tradespeople and its regulatory constraints — it is this local knowledge that makes the difference on site.

The budget: what the prices really hide

On paper, a house builder often displays an attractive all-in price. In practice, this price includes a commercial margin, standardised materials and subcontracting over which you have no control. Options and personalisation — often unavoidable — can quickly push the final bill well beyond the initial quote.

With independent project management, the project manager's fees — generally between 8% and 12% of the total works cost excluding VAT — are clearly identified and separate from the cost of the works. Ever