Deliverable 1.3 Sustainable renovation concepts for single-family houses : Report prepared for Nordic Innovation Centre

• Due to the introduction of low energy standards for new houses as minimum requirements,rising energy prices and generally more focus on energy performance, there is a need for farreachingenergy efficiency improvements in connection with renovation if existing singlefamilyhouses in the Nordic countries are to have competitive power compared to new houseson the future housing market. If the market is able to explain this to the homeowners there isan open market with undreamt-of possibilities. Good technical solutions exist but need to becombined based on the full range of (standard) solutions in order to reach the low primaryenergy level of new houses.The typical single-family houses identified to have large primary energy saving potentialalmost descend from the same time period in each Nordic country. A complete energyefficient renovation of a typical house include post-insulation and sealing of the buildingsenvelope - roof/ceiling, façade, windows/doors and foundation and maybe slab on ground -installation of a mechanical ventilation system with high efficiency heat recovery and lowelectricity use and possibly an energy efficient heating system based on district heating, heatpump etc. This package of technical solutions can be carried out during an overall or step wiseplanned renovation dependent on the condition of the house, the financial possibilities of thehomeowner etc.Calculation of packages of energy efficient renovation solutions targeted the three segmentsof houses show that primary energy use and heating bill can be reduced with up to about 75%or a factor 4 corresponding to the level of a new house or better. It seems that the passivehouse level can not quite be reached with standard solutions. They require that moreambitious measures are applied. The total investment needed to reduce the heating bill by afactor 4 including replacement of e.g. roof and windows is up to EUR 100,000. It is generallydifficult to obtain an economy in balance in the sense that the annual payment on a cheaploan, e.g. mortgage refinancing, to finance the investment is not fully offset by the expectedannual energy savings. Since, the cost of energy measures today may not correspond to theincreased market value of the house, it is important to find mechanisms so that the total costof the energy investments in the future is reflected as an increased value of the house. Butwith due regard to all the non-energy benefits, such as better and healthier indoor environmentand comfort, and less dependence on expected future higher energy prices, energy efficientrenovation will probably still be attractive for the average homeowner.One-stop-shops in the form of full-service providers of energy efficient renovation of singlefamilyhouse are missing in the Nordic countries. This service is vital to open up the market.A one-stop-shop could be seen as a possibility to make it easy for the homeowner to complywith possible future requirements to realize far-reaching energy savings in connection withextensive renovations, provided that the building sector offers the solutions. Homeownersneed someone to take care of all relevant steps necessary for the renovation of the houseincluding quotation for the work, financing and management of the contract work. An idealfull-service concept in five phases is proposed, going from initial evaluation of the house, toextensive analyses, proposal for package solutions, coordinated execution and operation andfinally management of the house after renovation.

Ämnesord

NATURVETENSKAP  -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)

NATURAL SCIENCES  -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)

Nyckelord

Environmental engineering

Miljöteknik

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