DIY at home is based on three technical pillars: preparing the surface, choosing the appropriate fastening for the material, and finishing. Mastering these fundamentals avoids most rework and extra costs on an amateur project. Home DIY projects have also become more complex in terms of regulations in recent years, with obligations for tool reparability and construction waste sorting.
Tool Reparability and Waste Sorting: What Changes for the DIYer
Since 2023, powered DIY and gardening tools are subject to a requirement for spare parts availability for five years. In practical terms, buying a drill or a jigsaw from a brand that does not comply with this rule risks having to replace the entire device at the slightest mechanical issue. Checking the availability of parts on the product sheet before purchase has become a cost-effective reflex.
On the waste side, source sorting into five categories has been mandatory for construction sites since January 1, 2024. Even for an individual renovating a room, material suppliers must take back certain waste under specific conditions. Separating wood, plaster, metal, plastic, and rubble from the start of the project simplifies disposal and avoids refusals at the waste disposal site.
On mulot-bricole.com, practical sheets detail the preparation and finishing gestures suitable for each type of surface, a useful addition when trying to limit mistakes and material waste.
Fastenings and Support Materials: Adapting the Technique to the Wall
The primary cause of failure in indoor DIY remains inappropriate fastening for the support. Plasterboard, hollow brick, solid concrete, and solid wood do not drill the same way and do not tolerate the same loads.
Identify Your Support Before Drilling
A simple tap already distinguishes a hollow wall (hollow sound, vibration) from a solid wall (dull sound, no vibration). For precise identification, an electronic material detector also locates metal studs, cables, and pipes. Drilling without prior detection risks damaging an embedded electrical network or a water supply line.
Choose the Appropriate Anchor
- Plasterboard wall: expansion anchor type Molly, which deploys behind the board to distribute the load over a larger area
- Hollow brick: toggle or chemical anchor (resin), as a standard anchor does not hold in the cells
- Concrete or stone: hammer-in or screw anchor, with drilling in impact mode and a concrete bit of the exact diameter of the anchor
- Solid wood: direct screw without anchor, with a pilot hole slightly smaller than the screw diameter to avoid splitting the wood
The diameter of the drill bit must match exactly that of the anchor. A hole that is too wide prevents the anchor from tightening; a hole that is too narrow deforms it upon insertion.
Interior Painting: Preparing the Surface for a Durable Result
Painting is the most common DIY project. The final result depends more than half on the preparation work, not on the application itself.
Clean, Sand, Fill
An already painted wall should be washed with alkaline detergent to remove ingrained grease and dust. Cracks and anchor holes should be filled with filler, then sanded once dry with fine-grit sandpaper. Applying paint to a poorly sanded wall produces a grainy result visible in low-angle light.
On a new surface (plaster, fresh filler), a primer is necessary. It standardizes the absorption of the wall and prevents the finishing paint from being “absorbed” by the surface, which creates color differences in areas.
Application and Drying
The roller should be loaded with paint on a third of its surface, no more. Applying in cross passes (vertical then horizontal) ensures even coverage. The drying time between two coats affects final adhesion: shortening this time is the most common cause of paint peeling in the following months.
Electrical Safety for Small Home Projects
Replacing a switch or adding an outlet remains accessible to a careful DIYer, provided they follow a non-negotiable rule: turn off the main circuit breaker before any intervention on a circuit.
Simply turning off the circuit breaker for the specific circuit is not always sufficient. An old or modified wiring may supply power to an outlet from an unexpected circuit. The voltage absence tester (VAT), a tool that costs a few euros, confirms that no current is flowing in the wires before handling them.
Electrical arcs, caused by poorly tightened connections or damaged wires, are among the frequent causes of house fires. Tightening each connection terminal to the specified torque and using standardized connectors (like Wago or terminal blocks) significantly reduces this risk.
Budget and VAT on Renovation Work in 2025
The VAT rates applicable to housing work changed on January 1, 2025. Work related to fossil boilers and certain hybrid heat pumps has been removed from reduced rates. However, energy efficiency work retains a reduced VAT framework specified by the decree of December 4, 2024.
For an individual having part of the work done by a contractor, this distinction directly affects the invoice amount. Ensuring that the company is RGE (Recognized Environmental Guarantee) qualified remains a condition to benefit from aids and the reduced rate on labor and installed supplies.
Self-performed work does not benefit from any reduced rate on the purchase of materials in stores. This limitation sometimes pushes individuals to entrust high fiscal value items (insulation, exterior joinery) to a professional while keeping the finishing work (painting, flooring) for self-completion.
A well-managed DIY project starts with choosing the right fastening, goes through rigorous surface preparation, and ends with waste disposal in compliance with sorting obligations. The gain is not only aesthetic: a properly prepared surface and tools that are repairable for five years reduce the actual cost of each intervention.
