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Want or need more space in the house? Discover our tips and tricks to start planning work with confidence.

Do you lack space and trade your cavernous basement against an authentic playroom? The layout of a cellar, attic or even attic is an ingenious solution to save space or even add a living room at home. How to proceed with the work, and especially what materials to use? We take stock of things to know before embarking.

What do you need to know before you start?

Before embarking on major development work in his home, it is necessary to learn about the legal obligations to be respected. That's why work often starts with a visit to the town hall. There is valuable information on the planning rules of a region. These may vary from one commune to another. Indeed, some cities may allow the development of a cellar and an attic, and others prohibit it for security reasons. A visit to the town hall of your municipality is therefore essential to determine the legality of the development work, according to the local urban plan (PLU) in force.

Once this parameter is verified, you must obtain a building permit. Indeed, a building permit is mandatory for any creation of living space of more than 20 m². This surface can go up to 40 m² when the municipality has a local urban plan. It is good to know that in some cases, depending on the increase in living space, the intervention of an architect is necessary. Once the building permit is posted, your close neighbors have a legal period of two months to contest the work. Litigation generally has the nature of creating a vis-à-vis between two houses.

Regardless of the legal aspect, it is necessary to dwell on the technical parameters. These vary depending on the space that you want to develop (insulation, carpentry, etc.). In the case of a cellar as a space attic, the ceiling height is a fundamental parameter. Indeed, your room can not be considered and used as such without a certain ceiling height. As regards the development of the attic, the height under slope is a parameter to be taken into account before starting work. The optimal slope is 45 degrees, a modification of the inclination can cause work of elevation of the frame of the house.

How to build a cellar?

Once the usual checks are made, you need to define your expectations in terms of layout, decoration and establish an accurate budget. In the case of the development of a cellar, the insulation of the walls and the ground will result in a cost proportional to the developed surface. Once the major insulation work is done, the coating materials will be selected based on the nature of the room, and the identity you want to give it. Some specific materials allow better resistance to weather and weather (eg water infiltration in case of flooding). Floating laminate flooring designed for rooms with potential for moisture combines comfort and safety in insulation. Depending on the use made of the room in the basement, the safest option against moisture remains the tiled floor.

How to build attic?

The development of the attic requires adjustment work that can quickly push up the overall bill of renovations. The type of frame of the house, as well as any work to be done on the roof will have a significant impact on the cost of the work. Small trick to reduce costs, the tiles moved during the modification of the roof can be reused. In case of raising the frame, heavy masonry work is to be expected. Once the contours of the room under the eaves drawn, it is necessary to define the number of openings on the outside. That is, the windows in the roof to ensure the brightness, and the possible interior partitions (sliding partitions, doors, etc.) to ensure privacy. For optimum comfort and brightness, there are many models of windows and skylights with double glazing, select according to the use of the room and the thermal and natural constraints. The most practical openings to install are Velux roof windows.

Looking for advice and inspiration to redevelop your cellar, attic or attic? Experts Lapeyre, for example, can provide you with ideas to develop these spaces!

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