Building a custom home means designing each room according to your actual habits. The number of bedrooms, the width of the hallway, the orientation of the living room: everything starts from your daily way of life. This type of real estate project requires methodical preparation, much more technical than a simple purchase of a new property. Several decisions made early in the design process condition the final budget, thermal comfort, and even resale value.
Summer comfort and RE2020: what changes for your custom home
Before discussing plans or materials, it is essential to understand the regulatory framework that applies to your project. RE2020 imposes energy and environmental performance requirements on new individual homes. One often underestimated point: the date of submission of the building permit determines the applicable regulatory framework, not the signing of the contract or the start of construction.
If your design spans several months, this distinction significantly changes the materials and systems you can use. Summer comfort has become a central regulatory issue. The orientation of the house, solar protections, thermal inertia of the walls, natural ventilation: these parameters must be integrated from the very first sketches, not added later.
A builder present on zlaticonstructions.fr supports its clients in this technical design phase, where each placement choice has a direct impact on regulatory compliance and the actual comfort of the home.
Another deadline to anticipate: gas heating will be excluded from new homes starting in 2027. If you submit your permit after this date, the choice of energy system must be made in advance, considering heat pumps, solar energy, or hybrid systems. Waiting until the last moment to decide can be costly in terms of plan modifications.
Buildable land: technical checks before purchase
You have spotted a plot that you like. The price fits your budget. Why not sign quickly? Because the land is the most unpredictable variable in a custom construction project.
The PLU dictates what you can build
The Local Urban Plan defines the rules for placement, maximum height, distances from property boundaries, and sometimes even the allowed facade materials. Consulting the PLU at the town hall before any promise of sale prevents discovering that a contemporary house project is impossible in an area with strict architectural prescriptions.
Soil studies and connections
The geotechnical study (G2 study) reveals the nature of the subsoil. A clayey plot, for example, requires reinforced foundations that can modify the budget by several thousand euros. Also check the availability of connections:
- Collective sanitation network or the obligation to install an individual sanitation system, which adds ground coverage and specific costs
- Distance to the electrical network and the drinking water network, as a plot far from the networks can incur significant development costs
- Access to fiber optic or mobile coverage if you work from home
These checks may seem tedious. However, they protect against cost overruns discovered during construction.
Construction budget: the items that no one details enough
The price announced by a builder rarely corresponds to the total cost of moving in. The actual budget includes the land, construction, ancillary costs, and external development.
Differentiating contractual cost from actual cost
In a Contract for the Construction of an Individual House (CCMI), the builder commits to a price for the work they perform. The work carried out directly by the buyer must be clearly distinguished in the contract, as the builder’s guarantees only cover services within their scope.
Specifically, if you decide to lay the tiles yourself or landscape the garden, these items fall outside the builder’s ten-year warranty. It’s better to know this before signing.
Often forgotten costs
- Development tax, calculated based on the created surface area and the municipal rate
- Notary fees on the land (higher than on a new property)
- Connections to networks if the land is not serviced
- External developments: fencing, driveway, earthworks, plantings
Allowing a safety margin in the overall budget remains the best way to avoid a blockage at the end of construction.
Architect or builder: choosing the right interlocutor for your project
You have two main options for managing the construction of your home. The choice between architect and builder depends on the desired level of customization and your ability to coordinate the work.
A builder working under a CCMI offers a fixed and definitive price, integrated damage insurance, and a single point of contact. This is the most legally secure framework for an individual. The downside: customization is limited by the builder’s models and processes.
An architect, required beyond a certain floor area, designs a house without catalog constraints. They act as project manager: they draw, submit the building permit, select the companies, and oversee the construction. The design freedom is total, but the coordination of the craftsmen relies more on the project owner (you) and the architect.
In both cases, check the guarantees: delivery guarantee at the agreed price and deadlines for the CCMI, ten-year insurance, and professional civil liability for the architect and each company involved in the construction.
Open RE2020 data: compare before signing
RE2020 performance data is now publicly accessible through state services. This openness covers individual and attached houses, from the submission of the permit to the completion of the work. Comparing the declared performances of projects allows you to go beyond mere commercial promises.
Before committing to a builder, you can consult this data to verify if the announced performance levels correspond to what is actually declared on comparable projects. This is a concrete negotiation tool, still little used by individuals.
A custom home project hinges on decisions made before the first shovel hits the ground. The regulatory framework, the choice of land, the structure of the budget, and the professional who supports you form a coherent whole. Each technical arbitration upstream reduces unpleasant surprises during construction.
