This thesis has been conducted in collaboration with JM AB, Region
Öst, based at their office in Uppsala. Below follows a summary of
For the major contractors in Sweden, the costs after the costumers
access are high. According to Boverket the costs can be as high as
1.3 billion SEK annually. In addition of the costs of the work
itself, the companies risks dissatisfied customers when the extra
work often is considered as a disturbance.
To investigate this matter, the purpose of this thesis is to answer
the following questions:
- What are the most common errors reported during the warranty
- Can the errors be addressed at an earlier stage?
- Is poor purchasing a contributing factor to the high costs during
the warranty period?
- Can a different ventilation system reduce the amount of errors?
The purpose of the study is to identify the most common errors that
occur during the warranty period, to summarize these and give
concrete suggestions of measures to reduce the errors. The report is
based on interviews, statistics of the errors from JM Region Öst
during year 2015 and the analysis of the customers feedback during
the warranty period of eight projects. In addition, the authors have
chosen to compare two different ventilations systems to see if the
change of system can reduce the number of error reports concerning
The study shows an even distribution of errors from the different
categories. The reports from JM Region Öst during year 2015 and the
average from the selected projects have similar distribution. Of the
total number of error reports from JM Region Öst during year 2015,
20.1 percent belonged to the category Plumbing. The same category
had, in the authors compilation of the eight projects, 20.2 percent
of the reports. From this result it can be concluded that the
percentage of problems reported from each category is about the
same, no matter the size of the project.
In the interviews, the most common errors and what causes these,
were discussed. Because of the many errors to the category Plumbing,
this was the main subject. During the interviews it was discovered
that different actors blames the problems on each other. However,
dirt in the pipe system in combination with a low water pressure was
considered to be the biggest cause of problems to the category.
The study also shows that a complicated list of responsibilities
generates costs for the after-sales department. The reason is that
the process of appointing a responsible actor becomes hard. The
consequence of this is that staff from the after-sales department is
forced to make visits to the projects only to be able to redirect
the matter to the responsible subcontractor.