Lower the repair costs of your one-family house.

Lower the repair costs of your one-family house

In 2016, there were a total of 1.5 million buildings in Finland, of which 85% were residential.

A large number of one-family houses were built in the 1970s and 1980s: houses built during those decades amount to almost 40% of the total floor area of all residential buildings in Finland. These buildings are now almost 50 years old and – based on the estimated service lives of the structural elements – in need of renovation. The repair costs have become clearly higher than the building maintenance costs.

Repair costs have exploded

According to a programme of the Ministry of the Environment, Kosteus- ja hometalkoot (“Humidity and Mould Damage”), there is humidity and mould damage in more than 250,000 detached houses in Finland, and more than half of the detached houses include damage that will lead to more extensive renovation needs and problems with humidity and mould if not repaired.

Humidity and mould damage annually cost up to €450 million to the social welfare and health care system. Water damage in detached houses alone gives rise to annual costs of approximately €70 million (€140 million total) and fire damage approximately €60 million (€200 million total).

The repair costs of one-family houses can be lowered by considering a variety of factors, such as the selected repair method, repair planning, the time of year when the repairs are made, the materials used, competitive bidding and the selected contractor, as well as the local competitive situation. The scope of repairs is more difficult to change, as the more extensively spread water damage is, for instance, the more extensive repairs it will cause and the longer the repairs will take. The repairs will also cost more. The repair scope should not be limited too much to save money, though, as it is likely that a hidden problem will cause much more harm and much higher costs in the future.

Underlying causes of most common damage types

Structures are most often damaged due to humidity. Humidity damage occurs if the humidity level of a structural element remains excessively high for too long. This means that the structure does not have any time to dry out. Structures can also be damaged due to mechanical wear or sunlight, for example. The ageing of materials and related changes may also cause damage. Elastic joints are a good example of this.

The underlying cause of the damage must be determined before starting the repairs to specify repair actions that will eliminate the cause so that the damage will not recur.

In houses built in the 1960s, 1970s and 1980s, problems are most often caused by a low foundation: the floor is mostly at ground level. Another problem that is most prevalent in houses from the 1970s is a flat roof. Between the late 1970s and late 1980s, mechanical exhaust ventilation was often installed in detached houses. If incorrectly adjusted, it can cause plenty of indoor air problems. False plinths were unnecessarily used in detached and terraced houses up to the 1980s.

The building boom and the recession in the 1990s caused hurry, botched construction work and financial difficulties. In the case of houses from this era, the fact that the regulations on modern waterproofing did not enter into force until 1999 should be kept in mind. This means that all sanitary premises built before that time have already reached the end of their estimated technical service life. Furthermore, construction materials that contain asbestos were still used in the early 1990s. The decade’s method of construction also included a double concrete slab, which is highly susceptible to humidity from the ground or the crawlspace. The thermal insulation layers in between the two concrete slabs may be damaged by microbes.

Homes dating back to the 1990s will soon be 30 years old, which means that many of the technical buildings systems will start to deteriorate. If the technical systems have been properly maintained, however, they may still be in working order. In other cases, they will probably require some renovation in the near future or right away.

In one-family houses dating back to the 2000s, mechanical ventilation may have a negative impact on the condition of the building and the indoor air quality. The filters of the mechanical ventilation system should be regularly cleaned and replaced, the system should be adjusted by a professional and the ventilation ducts should be cleaned at least every ten years. Particularly right after construction, the ducts should be cleaned by a professional (already before the building is ten years old), because any dust remaining from the construction activities will deteriorate the performance of the ventilation system.

In addition, many houses from the 2000s include uncovered balconies on top of the residential building. Proper removal of snow and proper drainage of water, as well as regular removal of debris from the balcony floor, should be ensured, so that moss growing on the balcony will be prevented, for example.

Issues to be considered during repairs

The general starting point for repair actions in one-family houses are the current building regulations and guidelines, which must be applied based on the intended use and requirements of the site. Preventive maintenance actions and quick repairing of any damage will save costs and retain the property’s value.

If damage is not repaired on time, it will usually become worse and harder to repair; repair costs will also increase over time. Non-repaired damage may also render the site not fit for living.

Preparing a repair work plan is usually always recommended. A plan is necessary when quotations for the renovation are being requested, for example, so that the offers can be compared. Supervision should not be overlooked either: implementation of the plan should be monitored throughout the repair project. Well documented repairs will make selling of the building easier.

The exact price of the renovation will not be determined until after repair planning. You should always be prepared for surprises during a renovation project: usually, the actual scope of the damage cannot be determined until after some of the structures have been removed. It’s better to be prepared for surprises as a normal part of a renovation project instead of surprising news.

All damaged materials must be replaced when repairing humidity/microbial damage. All rotted materials must also be removed and replaced with new ones. Spraying any “wonder stuff” into the structures is not the correct way of repairing microbial damage. Such a repair method will not eliminate the underlying cause of the damage, and such chemicals usually have very short-term effects.

The general starting point for repair actions in one-family houses are the current building regulations and guidelines.

Repairs at the correct time

Lähes kaikki omakotitalomme ovat ammattimaisen kiinteistönpidon ulkopuolella. Tästä johtuen harva kiinteistön omistaja hoitaa ja huoltaa kiinteistöään suunnitelmallisesti. Hänellä ei välttämättä ole siihen edes riittävää tietotaitoa.

Almost none of the Finnish detached houses are cared for by a professional caretaker. Hence, few property owners systematically maintain and repair their building. They might not even have the required know-how.

Regularly having a detached house inspected by a professional is therefore recommended. If a detached house is regularly inspected, any starting damage will more likely be found and repaired before it expands. This will reduce the costs and in some cases even avoid health problems.

Repair costs for one-family house

The repair costs for one-family houses are difficult to determine without inspecting the structures to be repaired in detail. As already stated, the repair costs depend on a variety of factors. Hence, the repair costs of one-family houses specified below are very rough estimates, and the final price may be significantly lower or higher. The prices are estimates that are based on a turnkey contract in the Helsinki metropolitan region.

RenovationRepair cost
Kitchen renovation, 12 m2€20,000 (approximately €1,700/m2)
Bathroom renovation, 6 m2€10,000 (approximately €1,700/m2)
Repainting a wooden house, 250 m2€17,000 (€68/m2)
Repairing a false plinth€350–500/m
Replacing windows€700/window
Replacing doors€900/door
Repairing a ventilated timber floor, 53 m2€16,000 + suction truck (4 h x €150/h)
Valesokkelin korjaus350 – 500 €/m
Base floor damage (ventilated timber floor)

– Repairing base floor
– Repairing bottom parts of exterior faces
– Exterior work (weeping drains, rainwater drainage, ground inclination)

Crawlspace repairs (ventilated timber floor)

– Manhole
– Ventilating slot + pipe
– Ventilating slot + grate
– Soil removal (suction truck)
– Soil removal (suction truck)
– Soil removal (shovel)
– Gravelling the crawlspace
– Duct fan
– Sealing penetrations


– Concrete tile roofing
– Lock-forming sheet steel roofing
– Corrugated sheet steel roofing
– Shingle roofing
– Fibre cement board roofing


Share this

Share this: Facebook Share this: LinkedIn Share this: Twitter Share this: WhatsApp