The choice of joinery in renovation is not based solely on the material. In Picardy, local regulatory constraints, certified performance of window-glazing units, and the availability of financial aid weigh as heavily as the PVC-aluminum-wood comparison in the success of a project.
Uw and Sw coefficients in joinery: what the quote must mention
Too many quotes only indicate the Ug coefficient of the glazing. This value, taken in isolation, does not inform about the actual performance of the installed joinery. The Uw coefficient measures the thermal loss of the entire window-glazing unit, including the frame. The lower it is, the better the insulation.
The Sw coefficient, on the other hand, reflects solar gains. In Picardy, where winter sunshine remains modest, a high Sw on south-facing facades allows for maximum passive heat capture. Demand these two values on each line of the quote: they condition not only thermal comfort but also eligibility for certain aids.
A serious craftsman like those referenced on menuiserie-airaines.fr provides this data without having to ask twice. The absence of these coefficients in a quote is a warning sign regarding the technical rigor of the provider.
Financial aids and joinery in Picardy: the process before signing
The CEE bonus for window replacement is subject to a condition often overlooked: it only applies to the replacement of single glazing. A property already equipped with double glazing, even if old and poorly performing, does not qualify for this specific bonus.
For MaPrimeRénov’, joinery is no longer eligible in isolation in all cases. However, it can be included in a larger renovation, under certain conditions. We recommend checking the complete aid process before signing any quote, as the order of steps matters: a request submitted after the start of work may be rejected.
Three points to secure before commitment:
- Confirm that the company holds a valid RGE qualification, a sine qua non condition for most aid schemes
- Check with Anah or a France Rénov’ advisor if the proposed replacement falls within the scope of a large-scale renovation or an eligible isolated action
- Obtain a detailed quote mentioning the Uw and Sw coefficients, the type of glazing, the frame material, and the installation method (total removal or preservation of the existing frame)
PVC, aluminum, or wood: decide based on Picard construction
PVC dominates the renovation market for its insulation-price ratio. On houses from the 1970s-1990s, which are very common in the Somme and Oise, it adapts easily to standard masonry openings. Its maintenance is limited to regular cleaning.
Aluminum takes over when openings are wide or when the specifications require slim profiles. Its rigidity allows for large openings without additional structural reinforcement, making it suitable for glass extensions or contemporary facades.
Wood remains the reference material in sectors subject to the opinions of the Architects of Buildings of France. Several Picard municipalities, particularly around Senlis, Compiègne, or Laon, require wooden joinery on street-facing facades. The additional maintenance cost (stain or paint every five to ten years) should be included in the overall budget from the start.
Mixed wood-aluminum joinery combines heritage compliance on the exterior and ease of maintenance on the interior. Its cost is significantly higher, but it avoids the regulatory dilemma in protected areas.
Installation in renovation: total removal or preservation of the frame
The installation method directly affects final performance. The total removal eliminates the old frame and allows for addressing weak points of sealing accumulated over decades. It is preferable when the structure shows signs of moisture or plumb defects.
The preservation installation (or renovation on the existing frame) is faster and less expensive. It is suitable for healthy, well-aligned, and still watertight frames. The compromise lies in the glazing area: the new frame overlaps the old one, slightly reducing the glazed surface.
In Picard houses made of brick or cut stone, total removal sometimes requires re-rendering or adjusting window supports. This masonry work, rarely itemized in an initial quote, can represent a significant additional cost. Always ask if external finishing work is included.
Selecting a joiner in Picardy: concrete checks
The RGE qualification is the first filter, but it is not enough to differentiate artisans. Check the validity of the certificate on the official website of the qualifying body (Qualibat, Certibat, or equivalent).
- Request references from recent projects within a close geographical radius, ideally on a building similar to yours
- Compare at least three quotes ensuring they cover identical services (same glazing, same installation method, same finishes)
- Verify that the ten-year insurance explicitly covers the installation of exterior joinery, and not just interior joinery or fittings
A local craftsman understands the climatic and heritage constraints of the area. In Picardy, exposure to prevailing westerly winds and high humidity levels impose choices of seals, hardware, and drainage that cannot be improvised from a national catalog.
Replacing joinery in Picardy involves sums and timelines that justify meticulous preparation. Checking performance coefficients, securing the aid process before any signing, and demanding a comprehensive quote remain the three reflexes that separate a successful renovation from a burdensome project.
