diff --git a/muranodashboard/common/net.py b/muranodashboard/common/net.py
index 35d21a210..fe9d9aca6 100644
--- a/muranodashboard/common/net.py
+++ b/muranodashboard/common/net.py
@@ -16,8 +16,11 @@
 import re
 import uuid
 
+from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 from horizon import exceptions
+from neutronclient.common import exceptions as exc
+from openstack_dashboard.api import keystone
 from openstack_dashboard.api import neutron
 from oslo_log import log as logging
 
@@ -35,6 +38,24 @@ NN_HELP = _("OpenStack Networking (Neutron) is not available in current "
             "environment. Custom Network Settings cannot be applied")
 
 
+def get_project_assigned_network(request):
+    tenant_id = request.user.tenant_id
+
+    tenant = keystone.tenant_get(request, tenant_id)
+    network_name = getattr(settings, 'FIXED_MURANO_NETWORK', 'murano_network')
+    tenant_network_id = getattr(tenant, network_name, None)
+    if not tenant_network_id:
+        LOG.warning(("murano_network property is not "
+                     "defined for project '%s'") % tenant_id)
+        return []
+
+    try:
+        tenant_network = neutron.network_get(request, tenant_network_id)
+        return [((tenant_network.id, None), tenant_network.name_or_id)]
+    except exc.NeutronClientException:
+        return []
+
+
 def get_available_networks(request, include_subnets=True,
                            filter=None, murano_networks=None):
     if murano_networks:
diff --git a/muranodashboard/environments/forms.py b/muranodashboard/environments/forms.py
index 36afcc601..d0ec5a632 100644
--- a/muranodashboard/environments/forms.py
+++ b/muranodashboard/environments/forms.py
@@ -13,6 +13,7 @@
 #    under the License.
 import ast
 
+from django.conf import settings
 from django import forms
 from django.utils.translation import ugettext_lazy as _
 from horizon import exceptions
@@ -39,14 +40,30 @@ class CreateEnvironmentForm(horizon_forms.SelfHandlingForm):
 
     def __init__(self, request, *args, **kwargs):
         super(CreateEnvironmentForm, self).__init__(request, *args, **kwargs)
-        net_choices = net.get_available_networks(request,
-                                                 murano_networks='translate')
-        if net_choices is None:  # NovaNetwork case
-            net_choices = [((None, None), _('Unavailable'))]
-            help_text = net.NN_HELP
+        env_fixed_network = getattr(settings, 'USE_FIXED_NETWORK', False)
+        if env_fixed_network:
+            net_choices = net.get_project_assigned_network(request)
+            help_text = None
+            if not net_choices:
+                msg = _("Default network is either not specified for "
+                        "this project, or specified incorrectly, "
+                        "please contact administrator.")
+                messages.error(request, msg)
+                raise exceptions.ConfigurationError(msg)
+            else:
+                self.fields['net_config'].required = False
+                self.fields['net_config'].widget.attrs['readonly'] = True
         else:
-            net_choices.insert(0, ((None, None), _('Create New')))
-            help_text = net.NEUTRON_NET_HELP
+            net_choices = net.get_available_networks(
+                request,
+                murano_networks='translate')
+
+            if net_choices is None:  # NovaNetwork case
+                net_choices = [((None, None), _('Unavailable'))]
+                help_text = net.NN_HELP
+            else:
+                net_choices.insert(0, ((None, None), _('Create New')))
+                help_text = net.NEUTRON_NET_HELP
         self.fields['net_config'].choices = net_choices
         self.fields['net_config'].help_text = help_text
 
diff --git a/releasenotes/notes/fixed-network-mode-for-envs-0af7dad3bee9957b.yaml b/releasenotes/notes/fixed-network-mode-for-envs-0af7dad3bee9957b.yaml
new file mode 100644
index 000000000..193657e0e
--- /dev/null
+++ b/releasenotes/notes/fixed-network-mode-for-envs-0af7dad3bee9957b.yaml
@@ -0,0 +1,18 @@
+---
+fixes:
+  - |
+    Introduce a fixed network mode for environments. Specifically,
+    when this mode is activated, in the environment creation dialog
+    user is no longer prompted for a network and instead a network
+    previously assigned to the current project is used.
+
+    Network is assigned to project using project metadata key (custom) with network ID as the value.
+    Specify this metadata key in Horizon config to be able to use it
+
+    This behavior is disabled by default and could be enabled by adding:
+
+    USE_FIXED_NETWORK = yes
+    FIXED_MURANO_NETWORK = murano_network
+
+    to the Horizon configuration.
+