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Build an extension: mistakes to avoid

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Build an extension: mistakes to avoid

Nicolas Aubert-Maguero

With the desire to enlarge his house or his apartment, extension is a frequent option for homeowners. She allows to create one or more pieces, and often redefine all the space to gain comfort of life. Half-way between construction and renovation, an extension is often much more complex than it seems. First point, the budget is to be considered by providing all the expenses and ancillary costs. The organization of the place is also to be reviewed with work on the traffic. Before you start making an extension, watch for any errors to avoid and discover the advice of professionals to properly frame the project.

In search of space, the extension is a solution for homes as for apartments in different forms (extension walk-level, multi-level or raised roof). First necessary step, a visit to the town hall allows consult the planning rules and know what is the enlargement capacity of the place. An appointment with an architect is often the logical consequence (even if the law does not require it below 150 square meters) for a well-crafted project. With the help of Cécile Poinsard-Durand, DPLG architect of Passage Architecture, and Nicolas Aubert-Maguéro of architecture architects, browse the points to watch to build a quality extension.

To discover> Build your house: the 5 key points

Error # 1: Minimize the budget of its extension

By just wishing gain a few square meterswe can think that the cost is minimal. It's the opposite! "The smaller the project, the higher the ratio of the price per square meter built, warns Cécile de Passage Architecture. Some costs are fixed and the time spent, soil surveys or site installation are independent of the number of square meters of the project. "In other words, for a small or large area, some costs are the same. The budget to be provided also depends on the function of the new room. "If the extension is a piece of waterit is more complex with the intervention of several trades, says Nicolas de maema architects. In any case, it is necessary to provide at least 2,500 to 3,000 euros per square meterwhen we do everything. It's hard to imagine less! "

Also read> Redo a bathroom ugly without breaking the bank

An example of a wood frame extension made by Passage Architecture.

Cécile Poinsard-Durand

Mistake # 2: Forgetting some unavoidable expenses for an extension

Taken in the excitement of the expansion project, it is quite easy to focus on current spending items and ignore other, yet substantial costs. Nicolas warns the owners: "Between network changes, Façade modifications and the difficulties of access, the budget climbs very quickly! "

To avoid unpleasant surprises, a list of fees is recommended. "Some costs must be taken into account and integrated into the overall envelope, warns Cecile.A soil survey for the building permit (otherwise the architect is not insured), the intervention of an office of studies to analyze the structures, a surveying survey to define the limits of ownership and to avoid the recourse of third parties during the instruction of the building permit, miscellaneous connection fees, thermal study costs if necessary to meet the standards in force and the owner's property damage insurance. "

Read also> What heating for an extension, a veranda or attic?

Error # 3: Mark a difference between the extension and the existing one

All the particularity of the extension is create a space from a building already present. Even though both parties have two different identities, the junction must be invisible. "Building an extension is also reshape the existing with a reported element, says Nicolas. The border between the two spaces is erased and they must not be dissociated anymore. "With the desire to link the extension to the existing one, it is advisable to create a connection." Today,volumes are often open and we like to mix them so that they overlap, continues the architect. The kitchen furniture is extended in the living room library, the flooring of the living room is also invited in the kitchen. The continuity is done by the floor, walls, etc. "

The extension of the house saves space and comfort in everyday life.

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In this house in Villejuif, Cécile Poinsard Durand-Passage Architecture has made an extension with large openings on the outside. One way to create a continuity between the existing and the extension.

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Mistake # 4: Surround yourself with selected professionals on the fly

In an extension project, the architect is the first intermediary. He chooses himself carefully so that he can best understand the expectations and needs. Thanks to its website, we can ensure that it has already achieved an extension and that its references correspond to our expectations. When you want to monitor the site and choose its craftsmen, a good organization is necessary. "If the owner is piloting the different trades, he has to make sure that the quotes are well detailed for control the building site, advises Cecile. For example, a quote line "painting" is not explicit enough. It may include laying a two-pass coating, sanding, or interfacing, a printing coat, and two coats of paint. Everything must be notified. Once you have found a trusted craftsman, do not hesitate to use his network to define a site team. "

To consult> Choosing the right craftsman for his work: our advice

Mistake # 5: Ignore Expanding Expansions

Inevitables in a building site, surprises (good or bad) lead to reconsider some points during the project. Anticipating these unexpected events allows greater flexibility and avoids being caught off guard. Cecile even reserves a dedicated budget in her estimate for an optimal evolution of work"For my projects, I always plan a "contingency reserve" which represents 2% of the budget and is useful when we discover a beam is in poor condition or a leaky pipe. There must be transparency and trust from the outset on the financial analysis of the project. "

Error # 6: Do not anticipate your needs during extension jobs

An extension also often requires having a temporary hosting solution the time of the works. A period that is not easy to quantify, a margin is important to predict. "During an extension, it is possible to stay in the house or apartment at the beginning of the construction site, during the foundations," says Nicolas de maema architects, "but as soon as the workers start to break everything, it is necessary to have another housing and to count a bit wide: an extension is at least six months of work!"

This rental represents a budget and constraints. "Among the ancillary costs, rent and storage costs resulting from it are to be taken into account, notes Cecile. You also have to think about finding an apartment near children's schools and in the area of ​​one's workplace. "

See also> Plan de maison: 11 architect projects to find inspiration

During the course of the work, it is possible to stay in one's house up to a certain point (realization maema architects).

Nicolas Aubert-Maguero

The ideal is to provide temporary housing with a little margin so as not to be caught off guard (realization maema architects).

Nicolas Aubert-Maguero

Mistake # 7: Stay on the job site when you can get involved

Depending on the case, doing some things yourself saves money and of to concentrate its budget on the technical poles. "There are several profiles of owners and some can take care of some of the work, Nicolas offers. the closed and covered (Editor's note: What closes and covers a construction (walls, doors, windows, roof ...))that is, ask professionals to put the extension out of the water and out of the air. The money is thus destined for all that one can not do and the rest is to be arranged as and when the means and the available time.

To read also> 12 smart ideas to enlarge the space yourself

Mistake # 8: Skip a Preliminary Feasibility Study

With the intention of having visibility on the project without commitment, the preliminary feasibility study allows to make a first point. "The preliminary feasibility study integrates all the project data (spatial, technical, administrative, financial, etc.) before considering an in-depth study and then the construction site, details Cécile de Passage Architecture. reveal the potential of the place, to define a program or even a phasing while ensuring to stay in adequacy with the budget. This is a preliminary expense which is then deducted from the fees of the global mission. After this study, we can decide whether to continue or not. "

Error # 9: Multiply levels with an extension

In the idea of create a continuity between the existing and the extensionit is advisable to promote the soil at the same level. "In a house, having all the rooms on the same level is a real luxury," says Nicolas, "building an extension is an opportunity to bring everything up to speed. give an impression of unity. The design should also ensure a good perspective between rooms with optimal sun input. Moreover the opening on the outside is paramount with a terrace that extends the interior. "

Read also> 15 kitchens that open copiously on the outside

Thinking of this extension, maema architects favored a house on one level to create a link between the different spaces.

Nicolas Aubert-Maguero

The light is also an asset in a house with extension with, as far as possible, an opening on the outside. As in this realization of architecture architects.

Nicolas Aubert-Maguero

Mistake # 10: Watch his short-term expansion project

An extension necessarily meets a need of the owners. But throughout life, wishes and constraints evolve. It is then interesting to project oneself by anticipating its needs for tomorrow. "When we make an extension, we can predict today the needs of the house in 5 or 10 yearsassures Cecile. We think then the site in phasage. For example, by making an extension with a room and a bathroom for children upstairs, we must integrate that they will grow quickly and become young adults. They will want to have their own desk in their room, a double bed, and they will scramble in the morning in the only bathroom. By projecting in the long term, we make technical and spatial choices that allow scalability. The longer-term extension may also be able to to become an independent apartment inexpensively, provided that the networks and the structure allow it, and that this has been anticipated in a global reflection. "

Error n ° 11: Thinking an extension without valuing its property

If the valuation of your home or apartment is not always the first desire in an extension project, it should not be put aside. "An extension is an opportunity to lead a global reflection on the valuation of its heritagesays the architect. Thanks to a fine analysis of the project, we optimize the property. If a larger loan is possible, a small risk taking brings another twist to the project. What can we get from it at best? "

In some cases, this operation is an interesting calculation with a real valuation of the property and financial benefits. "For example, some clients wanted to have an extra room," says Cécile, "When I studied the project, I realized that we could do a higher elevation or extension." It was then possible to make three independent studios for rent. make their project profitable. Rental of studios repaying the loan. All this approach is done before, before even establishing a program of realization. The valuation study of the property goes through a financial but also administrative and technical approach. "

To discover> How to personalize a furnished apartment?

The valuation of the property is always a reflex for Cécile Poinsard-Durand. As in this elevation realized by his agency Passage Architecture.

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The spaces are optimized by Passage Architecture to create pleasant living spaces in the long term.

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