If you plan to invest in a thermal sieve to renovate it and then rent it out, this study by the online real estate agency Flatlooker will give you valuable estimates to assess the cost of the work but also the minimum negotiation margins to be taken into account. account. Knowing of course that the more you manage to negotiate the purchase price based on the energy performance diagnosis (EPD), the better you will manage to make your investment profitable.
From G or F to D
Flatlooker has thus established the costs necessary to change a dwelling with a DPE G or F to D, a letter which does not benefit from any regulatory constraint in the future. The work includes the insulation of walls and ceilings, windows with ventilation and silent air extractor, a thermodynamic water heater, electric radiators with fluid inertia and of course the preparation and painting as well as the cleaning and waste removal.
For housing G to be improved in D, this work costs on average around €830 per m² for a small area (studio or 2 rooms) and comes down to around €750/m² for a three-room apartment of 65 m². To go from the letter F to D, the budget is a little lower: it will take 650 €/m² for a small area and around 570 €/m² for a three-room apartment.
Up to nearly €50,000 for a T3
The overall average cost of a renovation is thus estimated by Flatlooker at:
- T1 (25m²) in DPE F: just over €16,000 including tax
- T1 (25m²) in DPE G: approximately €20,700 including tax
- T2 (40m²) in DPE F: approximately €25,600 including tax
- T2 (40m²) in DPE G: just over €33,000 including tax
- T3 (65m²) in DPE F: approximately €37,000 including tax
- T3 (65m²) in DPE G: approximately €48,700 including tax
Think about doing a complete renovation
Flatlooker specifies that this study is generalist and does not take into account the specific cases of apartments on the ground floor or on the top floor which may require additional costs. It should also be noted that these costs do not include the renovation of the floors, the kitchen or the bathroom. However, it is of course preferable to completely renovate the property to rent it more easily…
Insulation from the inside = loss of surface
Please note that buyers must take into account the loss of surface area due to the insulation which will most of the time be done from the inside in the case of an old apartment. Flatlooker, for example, estimates the loss of surface area at 2.5 m² for a 25 m² studio displaying the letter G because the insulation must be 10 cm thick. On arrival, it is therefore 10% of the living space which will be lost and which you will have to take into account when negotiating the price of the apartment.
For the same studio with the letter F, the insulation will be less thick and the loss of surface will be limited to 3%. These surface losses are estimated at around 8% for a T2 or a T3 rated G and are comparable (around 3%) for a T2 or a T3 with the letter F. Note of course that these surface losses do not have the same financial consequence in cities where the price per m² is €2,000 as in metropolitan areas where it is €5,000 or even €10,000 in Paris.
Energy savings
Flatlooker also evaluated the energy savings achieved following the renovation of this type of energy strainers. For a studio, savings in electricity consumption range from just over €1,000 per year for the letter F to €1,340 for the letter G. For a T2, we can hope to save €1,650 and €2,144 respectively. . For a T3, the difference is up to €2,680 (F) and €3,485 (G).
“ Renovating your property can result in energy savings as well as an increase in its market value. However, given the increase and fluctuations in the cost of energy, it is difficult to accurately estimate the savings made on an annual basis to include them in the calculation of the sale price or in the calculation of the rent. Moreover, although the regulations prohibiting the rental of accommodation considered as thermal sieves can prevent a devaluation of your property, it does not guarantee an improvement in its resale value. “, explains Nicolas Goyet, the manager of Flatlooker.