Roof repair: Prices and subsidies for roof renovation
The repair of a roof is important to maintain the waterproofness of the roof and the sanitation of the building. When renovating a roof, it is important to take into account the insulation of the roof in the works to save energy and have comfort in winter as in summer. If a simple renovation of the roof is insufficient, repair is necessary. Before preparing your budget, which varies depending on the material chosen, find out about the regulations in force and the possible particularities (co-ownership, adjoining houses). Calculate the amount of your aid for the repair of your roofs Learn more about the tax credit for roof repair projects
Bon Plan Calculeo: insulate your attic for € 1!
Thanks to the Pacte Energie Solidarité program, you can insulate your lost roof space for € 1. This program continues to grow and is now considered one of the most effective ecological aids and we strongly recommend it to our users.
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Principles of a roof repair
Ensure roof waterproofing
The purpose of renovating the roof is to seal the roof. For this, the roof covering can be removed and changed (tiles, slates …). In cases of major repairs, the frame is to be resumed. It is absolutely necessary to call on a professional carpenter to have a secure site.
When a renovation is not enough
The roof is a critical part in a home: a roof in poor condition allows heat to come out (heat loss) and rain and air to enter (infiltration). These infiltrations are at the origin of the development of plants on the walls, which deteriorates the air quality. With regard to the lack of air tightness, the creation of drafts leads to heat losses and an increase in energy expenditure. The first way to remedy these drawbacks is to renovate the roof by identifying damaged areas, to apply water-repellent treatments and to install an under-roof screen. When the leaks are too great and / or the roof too old, it is necessary to go to repair. Before starting, you must estimate the extent of the damage by going into the attic or the attic. This also makes it possible to check whether the frame has not been affected by infiltration. If this is the case, a specialist must first repair the frame
Applicable regulations and recommendations
During a complete identical repair, unless otherwise provided in the local urban plan (PLU), a prior declaration of work must be made. When the repair results in a so-called minor modification of the exterior appearance of the house (change of the roofing material concerning its color, shape or nature), prior declaration is also necessary. We must also respect the standards related to the chosen material and the municipal PLU. The General Commission for Standardization of the Building in charge of Unified Technical Documents develops the standards (DTU) relating in particular to the roof. These rules concern the shape of the roof, its characteristics, its construction and its aesthetic appearance. The application of the recommendations contained in these DTUs enables quality coverage to be obtained and guarantees to be covered by insurance in the event of a claim.
In co-ownership or joint ownership
According to the rules of the condominium, the work carried out on a given roof may concern all the co-owners or only those whose apartment is in this specific building. When the renovation is part of maintenance work, the simple majority must be obtained at the assembly of co-owners. If it corresponds to improvement works, the majority of 2/3 is required or even unanimously if a loan has been contracted. If the work is undertaken as a matter of urgency, the agreement of the co-owners will be requested at an extraordinary meeting after the start of the repair.
Joint ownership concerns co-ownership on a property separating two adjoining homes. When two buildings side by side have their roofs aligned, it is not a question of joint ownership because the roofs are distinct. Each owner can renovate his roof when he wishes. If two buildings have the same roof and the same frame, we enter in the case of a condominium
Roof repair price
To renovate a roof, the overall cost consists of materials and labor. It may be necessary to add the price of the renovation of the frame if it has also been damaged. Among the least expensive materials, we find shingle (from 8 to 15 euros / m2), wood (between 10 and 20 euros / m2 for shingles and around 30 euros / m2 for solid wood) and concrete tiles (between 25 and 30 euros / m2). For more than 30 euros / m2, you can cover your roof with metal (steel, from 30 to 45 euros / m2; zinc, between 45 and 150 euros / m2), polycarbonate (from 30 to 40 euros / m2), terracotta tiles (from 45 to 55 euros / m2) or synthetic slates (from 50 to 75 euros / m2). The most expensive materials are natural slates (from 80 to 150 euros / m2), thatch (between 120 and 150 euros / m2) and photovoltaic tiles (from 900 to 2,000 euros / m2). For a green roof, the more dense and diverse the vegetation, the more it will be expensive: between 120 and 300 euros / m2 for an intensive green roof, from 60 to 120 euros / m2 for the semi-extensive one and between 20 and 60 euros / m2 for the extensive one.
Improve the level of insulation
The increase in the price of energy, in addition to the sealing concerns, makes insulation of the roof essential. Two options are possible:
If you want to have fitted roof spaces, it will be necessary to insulate under crawlers.
. If you want to have lost roof space, it is advisable to insulate the floor from the attic or roof space.
Energy savings thanks to roof insulation
According to ADEME, uninsulated single-family homes represent great potential for energy savings for their owners. The heat losses in a single house are broken down as follows:
25 to 30% of energy lost from the roof. Lost roof spaces, fitted roof spaces, roof terraces are too often little or not insulated.
. Lost roof spaces, fitted roof spaces, roof terraces are too often little or not insulated. 20 to 25% by the walls,
.7 to 10% from the bottom floor
Roof insulation is too often overlooked and insufficient. It is a very simple and fast way to save energy
The additional cost of roof insulation quickly pays for itself
The additional cost of efficient roof insulation is quickly recouped by the energy savings made thereafter. For poorly insulated houses, it only takes 3 to 7 years to make the work profitable.
These works are also encouraged by the State and local communities through numerous subsidies, which can be combined with several ecological aids, the most important of which is the 2017 energy transition tax credit for roof renovation.
Aid and subsidies to better insulate your roof
The overall cost of roof repair work is relatively high. As a result, most of the homes tend to postpone this type of work. However, there are several aid schemes such as the Calculeo energy renovation bonus for roof repairs, the green tax credit, Anah aid and subsidies for roof renovation as well as a plethora of subsidies from regional councils. This aid, which can often be combined under certain conditions, can help to drastically reduce the cost price of a roof repair project.
Are you eligible for subsidies for your insulation?