What is the energy certification of buildings and what are the relevant regulations?

Energy certification of buildings is a complex challenge, because it is the complex structure of energy consumption that "revolve" around and within them, and the legislation that has been created around it.

What is even more complicated if we consider the fact that on the one hand in the buildings you are entering new elements, such as renewable energy systems, while on the other the actual overall performance under the energy profile of the building depends on the quality materials and the implementation of the same, two aspects that always in construction are issues with many shadows.

In this scenario the appearance of certification, ie the validation "objective" of the energy performance is quite complicated. While, in fact, the whole issue is defined by the Legislative Decree of 19 August 2005 implementing Directive 2002/91/EC on the other hand there are a number of substantial updates, such as the Legislative Decree 115/2008 which transposes Directive 2006 / 32/CE, staring at a reduction of energy consumption by 9% our own. The latter value needed in a broader context as the European one, where Brussels has set binding targets, both for the reduction of energy consumption, both for the reduction of emissions of greenhouse gases.

To all this is added to the report, often problematic, both with Community law - with various statements of the Court of Justice of the European Community which has always stressed the fact that the national legislation must not conflict with European ones - and with those of regions, because to them it is the legislative competence, under Article 117, paragraph 3 of the Constitution which outlines the 'production, transport and distribution of energy' as a subject "competition" between the regions and the state.

In summary the competence of the State should, the conditional is necessary, return the enactment of laws that govern contracts for the energetic connection that require certification, while the regions have the "power" is to establish cases in which there is requirement of certification, and the determination of the requirements for the certificate and finally the definition of those who are authorized to issue the document that it is now mandatory for all acts, such as rent, sale and access encouraging tax 55% of real estate and has ten years of validity. In regions that have not yet legislated on the subject is valid national legislation and in particular the energy certificate must be prepared in accordance with the Guidelines present the Ministerial Decree of 26 June 2009.

 

Objectives fine

The general objectives he has set himself the legislature are to improve the real estate market by providing tenants and buyers a clear picture about consumption, and expenses, related to the use of energy, to warn the owners about the potential "commercial" , with an increase in the sale price of shares in energy improvements to enhance the quality of the offer by builders and designers. All targets that pass through the certification, which represents the document "objective" making it known interventions or quality of construction, hidden in partial observation of the property as one that takes place during a visit to an apartment for a sale or a lease.

Today the energy label of real estate is made up of eight classes with power consumption ranging from less than 15kW / h per square meter each year to more than 160 kWh per square meter per year. The first class, the one referring to the "passive house" could lead to some misunderstanding as it comes to consumption of less than 15kW / h per square meter when in fact the very definition of this type of home states the ability to produce more energy As consumption.

In this class, energetic, in fact, is very simple, by adopting technical solutions, even in the restructuring and applying renewable energy sources, energy balance have a "passive" and begin to be cases in which some professionals are taking the path of restructuring "radical" of buildings with over fifty years of life, causing them to get to the finish of the passive house. These are cases that could be defined as the study, but it gives an idea of the potential of techniques and technologies available today for energy efficiency.

The reality, though, is different from the case studies and good practices. In Italy, estimates Cresme about real estate homegrown shows that 85% of the buildings were made before 1991 and therefore without any certification with regard to energy consumption. As for the benefits derived from the re-certified Reeds has calculated that with a restructuring that provides for the replacement of windows and the realization of a coat, which cost around 90 euro per square meter, you get an energy saving of 25%, which, once certified produces a revaluation of 10% of the property price.

But the first months of mandatory energy certification, it should be remembered that this year takes twenty years since it was introduced for the first time by Law 10 of 1991, do not give satisfying results, before the summer only 13% the real estate ads was on track with the statement about the energy class of real estate.

 

Three energy classes

What KlimaHouse

KlimaHouse is the building standard created by the Province of Bolzano introduced in 2002 as transposition "independent" of Directive 2002/91/EC.

The model includes three KlimaHouse energy classes:

1. GOLD CLASS: less than 10 kWh / sqm / year,

2. CLASS A: less than 30 kWh / sqm / year,

3. CLASS B: less than 50 kWh / sqm / year.

KlimaHouse provides that the certificate is drawn up during the whole process of construction by an independent party not involved neither in design nor in the building.

 

25/11/2012

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Translated via software

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Source:

Italian version of ReteArchitetti.it

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