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 farreaching
energy efficiency improvements in connection with renovation if existing singlefamily
houses in the Nordic countries are to have competitive power compared to new houses
on the future housing market. If the market is able to explain this to the homeowners there is
an open market with undreamt-of possibilities. Good technical solutions exist but need to be
combined based on the full range of (standard) solutions in order to reach the low primary
energy level of new houses.
The typical single-family houses identified to have large primary energy saving potential
almost descend from the same time period in each Nordic country. The first segment is houses
built in large numbers in the 1960 and 1970 before tightening of the insulation standards in
the building codes in the late 1970’s due to the oil crisis. The second segment is houses built
before 1945 (except for Finland) where a large part of them has been renovated, but energy
renovation of those houses today would still account for a large energy saving. The third
segment is type houses from the post-war period in Finland.
A complete energy efficient renovation of a typical house include post-insulation and sealing
of the buildings envelope - roof/ceiling, façade, windows/doors and foundation and maybe
slab on ground - installation of a mechanical ventilation system with high efficiency heat
recovery and low electricity use and if not already there, an energy efficient heating system
based on district heating, heat pump etc. This package of technical solutions can be carried
out during an overall or step wise planned renovation dependent on the condition of the
house, the financial possibilities of the homeowner etc.
Calculation of packages of energy efficient renovation solutions targeted the three segments
of 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 passive
house level can not quite be reached with standard solutions. They require that more
ambitious measures are applied. The total investment needed to reduce the heating bill by a
factor 4 including replacement of e.g. roof and windows is up to EUR 100,000. It is generally
difficult to obtain an economy in balance in the sense that the annual payment on a cheap
loan, e.g. mortgage refinancing, to finance the investment is not fully offset by the expected
annual energy savings. Since, the cost of energy measures today may not correspond to the
increased market value of the house, it is important to find mechanisms so that the total cost
of the energy investments in the future is reflected as an increased value of the house. But
with due regard to all the non-energy benefits, such as better and healthier indoor environment
and comfort, and less dependence on expected future higher energy prices, energy efficient
renovation will probably still be attractive for the average homeowner.
One-stop-shops in the form of full-service providers of energy efficient renovation of singlefamily
house 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 comply
with possible future requirements to realize far-reaching energy savings in connection with
extensive renovations, provided that the building sector offers the solutions. Homeowners
need someone to take care of all relevant steps necessary for the renovation of the house
including quotation for the work, financing and management of the contract work. An ideal
full-service concept in five phases is proposed, going from initial evaluation of the house, to
extensive analyses, proposal for package solutions, coordinated execution and operation and
finally management of the house after renovation.
The project is part if the Nordic Call on Sustainable Renovation NICe project number 08191 SR