diff --git a/src/matrixfree/setNonlinearEqInitialGuess.cc b/src/matrixfree/setNonlinearEqInitialGuess.cc
index e8ba24f3e..670727ed0 100644
--- a/src/matrixfree/setNonlinearEqInitialGuess.cc
+++ b/src/matrixfree/setNonlinearEqInitialGuess.cc
@@ -12,7 +12,8 @@ MatrixFreePDE<dim, degree>::setNonlinearEqInitialGuess()
   // log time
   computing_timer.enter_subsection("matrixFreePDE: setNonlinearEqInitialGuess");
   Timer time;
-  char  buffer[200];
+  time.start();
+  char buffer[200];
 
   for (unsigned int fieldIndex = 0; fieldIndex < fields.size(); fieldIndex++)
     {
@@ -114,8 +115,7 @@ MatrixFreePDE<dim, degree>::setNonlinearEqInitialGuess()
                        solver_control.tolerance(),
                        solutionSet[fieldIndex]->l2_norm(),
                        dU_norm);
-              pcout << buffer;
-              pcout << std::endl;
+              pcout << buffer << "\n";
             }
         }
     }
diff --git a/src/userInputParameters/loadVariableAttributes.cc b/src/userInputParameters/loadVariableAttributes.cc
index 82355d7e8..88e274ae3 100644
--- a/src/userInputParameters/loadVariableAttributes.cc
+++ b/src/userInputParameters/loadVariableAttributes.cc
@@ -53,7 +53,7 @@ userInputParameters<dim>::loadVariableAttributes(
   varInfoListExplicitRHS.reserve(num_var_explicit_RHS);
   for (unsigned int i = 0; i < number_of_variables; i++)
     {
-      variable_info varInfo {
+      const variable_info varInfo {
         var_type[i] == SCALAR,
         i,
         variable_attributes.equation_dependency_parser.eval_flags_explicit_RHS[i],
@@ -78,7 +78,7 @@ userInputParameters<dim>::loadVariableAttributes(
   varInfoListNonexplicitRHS.reserve(num_var_nonexplicit_RHS);
   for (unsigned int i = 0; i < number_of_variables; i++)
     {
-      variable_info varInfo {
+      const variable_info varInfo {
         var_type[i] == SCALAR,
         i,
         variable_attributes.equation_dependency_parser.eval_flags_nonexplicit_RHS[i],
@@ -104,7 +104,7 @@ userInputParameters<dim>::loadVariableAttributes(
   varInfoListLHS.reserve(num_var_LHS);
   for (unsigned int i = 0; i < number_of_variables; i++)
     {
-      variable_info varInfo {
+      const variable_info varInfo {
         var_type[i] == SCALAR,
         i,
         variable_attributes.equation_dependency_parser.eval_flags_nonexplicit_LHS[i],
@@ -118,14 +118,14 @@ userInputParameters<dim>::loadVariableAttributes(
   varChangeInfoListLHS.reserve(num_var_LHS);
   for (unsigned int i = 0; i < number_of_variables; i++)
     {
-      variable_info varInfo {var_type[i] == SCALAR,
-                             i,
-                             variable_attributes.equation_dependency_parser
-                               .eval_flags_change_nonexplicit_LHS[i],
-                             variable_attributes.equation_dependency_parser
-                               .eval_flags_residual_nonexplicit_LHS[i],
-                             !static_cast<bool>(varInfo.evaluation_flags &
-                                                dealii::EvaluationFlags::nothing)};
+      const variable_info varInfo {var_type[i] == SCALAR,
+                                   i,
+                                   variable_attributes.equation_dependency_parser
+                                     .eval_flags_change_nonexplicit_LHS[i],
+                                   variable_attributes.equation_dependency_parser
+                                     .eval_flags_residual_nonexplicit_LHS[i],
+                                   !static_cast<bool>(varInfo.evaluation_flags &
+                                                      dealii::EvaluationFlags::nothing)};
 
       varChangeInfoListLHS.push_back(varInfo);
     }
@@ -135,7 +135,7 @@ userInputParameters<dim>::loadVariableAttributes(
   pp_baseVarInfoList.reserve(number_of_variables);
   for (unsigned int i = 0; i < number_of_variables; i++)
     {
-      variable_info varInfo {
+      const variable_info varInfo {
         var_type[i] == SCALAR,
         i,
         variable_attributes.equation_dependency_parser.eval_flags_postprocess[i],
@@ -164,7 +164,7 @@ userInputParameters<dim>::loadVariableAttributes(
   pp_varInfoList.reserve(pp_number_of_variables);
   for (unsigned int i = 0; i < pp_number_of_variables; i++)
     {
-      variable_info varInfo {
+      const variable_info varInfo {
         pp_var_type[i] == SCALAR,
         i,
         dealii::EvaluationFlags::nothing,
diff --git a/src/userInputParameters/load_BC_list.cc b/src/userInputParameters/load_BC_list.cc
index 1c608c53e..2976486db 100644
--- a/src/userInputParameters/load_BC_list.cc
+++ b/src/userInputParameters/load_BC_list.cc
@@ -6,6 +6,7 @@
 #include <deal.II/base/exceptions.h>
 
 #include "../../include/userInputParameters.h"
+#include <cstddef>
 
 template <int dim>
 void
@@ -28,7 +29,7 @@ userInputParameters<dim>::load_BC_list(const std::vector<std::string> &list_of_B
       // the same BC is applied for all boundaries
       if (temp.size() == 1)
         {
-          temp.resize(2 * dim, temp[0]);
+          temp.resize(static_cast<size_t>(2 * dim), temp[0]);
         }
 
       // Load the BC for each boundary into 'newBC'.
@@ -76,10 +77,8 @@ userInputParameters<dim>::load_BC_list(const std::vector<std::string> &list_of_B
           // domain
           if (j % 2 == 0)
             {
-              AssertThrow(!((boost::iequals(temp[j], "PERIODIC") &&
-                             !boost::iequals(temp[j + 1], "PERIODIC")) ||
-                            (!boost::iequals(temp[j], "PERIODIC") &&
-                             boost::iequals(temp[j + 1], "PERIODIC"))),
+              AssertThrow(boost::iequals(temp[j], "PERIODIC") ==
+                            boost::iequals(temp[j + 1], "PERIODIC"),
                           dealii::ExcMessage(
                             std::string("Periodic boundary condition must be "
                                         "specified on both sides of domain")));
diff --git a/src/userInputParameters/load_user_constants.cc b/src/userInputParameters/load_user_constants.cc
index 2b96cdcd0..39c516adc 100644
--- a/src/userInputParameters/load_user_constants.cc
+++ b/src/userInputParameters/load_user_constants.cc
@@ -214,7 +214,7 @@ userInputParameters<dim>::load_user_constants(inputFileReader          &input_fi
 
               const std::string elastic_const_symmetry =
                 model_constants_type_strings.at(0);
-              dealii::Tensor<2, 2 * dim - 1 + dim / 3> temp =
+              dealii::Tensor<2, 2 *dim - 1 + dim / 3> temp =
                 get_Cij_tensor(temp_elastic_constants, elastic_const_symmetry);
               model_constants.push_back(temp);
             }
diff --git a/src/userInputParameters/setTimeStepList.cc b/src/userInputParameters/setTimeStepList.cc
index 0382a8443..241187b68 100644
--- a/src/userInputParameters/setTimeStepList.cc
+++ b/src/userInputParameters/setTimeStepList.cc
@@ -64,8 +64,9 @@ userInputParameters<dim>::setTimeStepList(
       timeStepList.push_back(1);
       for (unsigned int iter = 2; iter <= totalIncrements; iter++)
         {
-          const unsigned int decade    = std::ceil(std::log10(iter));
-          const unsigned int step_size = std::pow(10, decade) / numberOfOutputs;
+          const unsigned int decade = std::ceil(std::log10(iter));
+          const auto         step_size =
+            static_cast<unsigned int>(std::pow(10, decade) / numberOfOutputs);
           if (iter % step_size == 0)
             {
               timeStepList.push_back(iter);
diff --git a/src/userInputParameters/userInputParameters.cc b/src/userInputParameters/userInputParameters.cc
index 81f33e2be..9a168a6c2 100644
--- a/src/userInputParameters/userInputParameters.cc
+++ b/src/userInputParameters/userInputParameters.cc
@@ -136,9 +136,10 @@ userInputParameters<dim>::userInputParameters(inputFileReader          &input_fi
     }
 
   // Time stepping parameters
-  dtValue                        = parameter_handler.get_double("Time step");
-  const int totalIncrements_temp = parameter_handler.get_integer("Number of time steps");
-  finalTime                      = parameter_handler.get_double("Simulation end time");
+  dtValue = parameter_handler.get_double("Time step");
+  const int totalIncrements_temp =
+    static_cast<int>(parameter_handler.get_integer("Number of time steps"));
+  finalTime = parameter_handler.get_double("Simulation end time");
 
   // Linear solver parameters
   for (unsigned int i = 0; i < number_of_variables; i++)
diff --git a/src/utilities/vectorBCFunction.cc b/src/utilities/vectorBCFunction.cc
index fe683b7d0..950c946c7 100644
--- a/src/utilities/vectorBCFunction.cc
+++ b/src/utilities/vectorBCFunction.cc
@@ -18,8 +18,8 @@ vectorBCFunction<dim>::vectorBCFunction(std::vector<double> input_values)
 
 template <int dim>
 void
-vectorBCFunction<dim>::vector_value(const dealii::Point<dim> &p,
-                                    dealii::Vector<double>   &values) const
+vectorBCFunction<dim>::vector_value([[maybe_unused]] const dealii::Point<dim> &p,
+                                    dealii::Vector<double> &values) const
 {
   for (unsigned int i = 0; i < dim; i++)
     {