## 4 Results
### Results of the Analysis of Influence Factors  
The respondents assessed, on a five-point Likert scale, the impact of 33 factors on the quality of housing construction. Individual identified factors were assigned to individual stages of the construction process. Quantitative and percentage results are presented in Table 6.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Factor**} & \multicolumn{4}{c}{**Factor Evaluation**} \\  & & **1** & **2** & **3** & **4** & **5** \\ \hline
**I** & **STAGE I—making a decision by the contractor to start the process of preparing the documentation analysis** & & & & \\  & Lack of internal control of the design documentation before the & 0 & 1 & 15 & 20 & 18 \\ C1 & start of the construction of the facility & (0.0\%) & (1.8\%) & (26.8\%) & (35.7\%) & (32.1\%) \\ \hline
**II** & **STAGE II—preparation by the contractor of an offer for the implementation of the investment** & & & & \\  & Errors in bills of quantities (poorly made bills of quantities that & 0 & 8 & 8 & 28 & 12 \\  & do not take into account a number of contract items) & (0.0\%) & 14.3\%) & (14.3\%) & (50.0\%) & (21.4\%) \\ C3 & Design errors in the documentation & 0 & 4 & 5 & 21 & 25 \\  & (0.0\%) & (7.1\%) & (8.9\%) & (37.5\%) & (44.6\%) \\ C4 & There is no database regarding companies that perform & 0 & 0 & 3 & 17 & 33 \\  & construction works at a high level & (0.0\%) & (0.0\%) & (5.4\%) & (30.4\%) & (58.9\%) \\ C5 & Failure to analyze offers for the execution of works and also & 2 & 5 & 13 & 25 & 11 \\  & failure to confront them with the investor’s cost estimate & (3.6\%) & (8.9\%) & (23.2\%) & (44.6\%) & (19.6\%) \\ C6 & No production preparation department & 4 & 14 & 22 & 5 & 0 \\ \hline
**III** & **STAGE III—implementation of the building shell** & & & & \\  & Changes in the design of the facility’s elements during its & & & & \\  & construction which generate additional technical problems to be & (0.0\%) & (0.0\%) & (5.4\%) & (57.1\%) & (37.5\%) \\  & solved (e.g., optimization of the structure, installations. etc.) & & & & \\  & Delays in the implementation of reinforced concrete works. i.e., & 1 & 8 & 15 & 26 & 5 \\  & a key element of each investment, which translates into delays & (1.8\%) & (14.3\%) & (26.8\%) & (46.4\%) & (8.9\%) \\  & in subsequent scopes of works & 3 & 6 & 1 & 6 & 31 \\  & Lack of experience of the site manager in the organization of & (5.4\%) & (10.7\%) & (1.8\%) & (10.7\%) & (55.4\%) \\ \hline
**IV** & **STAGE IV—execution of finishing works** & & & & \\  & Lack of interior design for common areas—works are carried & 0 & 2 & 3 & 0 & 20 \\ C10 & out based on current arrangements during the construction & (0.0\%) & (3.6\%) & (5.4\%) & (0.0\%) & (35.7\%) \\ C11 & Lack of participation of the construction manager in the process & & & & 24 & 29 \\  & of contracting contractors for finishing works & & (0.0\%) & (5.4\%) & (42.9\%) & (51.8\%) \\ C12 & Contracting companies without experience and the verification & 0 & 0 & 0 & 16 & 40 \\ C12 & of their competence and references & (0.0\%) & (0.0\%) & (0.0\%) & (28.6\%) & (71.4\%) \\ C13 & Lack of a prepared contract team that is capable of carrying out & 0 & 2 & 10 & 29 & 14 \\  & dozens of tenders in a short time interval & (0.0\%) & (3.6\%) & (17.9\%) & (51.8\%) & (25.0\%) \\ \hline \hline \end{tabular}
\end{table}
Table 6: Results of assessing the factors by respondents.