diff --git a/.gitignore b/.gitignore
index 7b9522c3b7..6b36e2d1d2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -36,6 +36,8 @@ InvenTree/media
 InvenTree/static
 media
 static
+inventree_media
+inventree_static
 
 # Local config file
 config.yaml
diff --git a/InvenTree/InvenTree/fields.py b/InvenTree/InvenTree/fields.py
new file mode 100644
index 0000000000..7a2fa4b89a
--- /dev/null
+++ b/InvenTree/InvenTree/fields.py
@@ -0,0 +1,27 @@
+""" Custom fields used in InvenTree """
+
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from .validators import allowable_url_schemes
+
+from django.forms.fields import URLField as FormURLField
+from django.db import models as models
+from django.core import validators
+
+
+class InvenTreeURLFormField(FormURLField):
+    """ Custom URL form field with custom scheme validators """
+
+    default_validators = [validators.URLValidator(schemes=allowable_url_schemes())]
+
+
+class InvenTreeURLField(models.URLField):
+    """ Custom URL field which has custom scheme validators """
+
+    default_validators = [validators.URLValidator(schemes=allowable_url_schemes())]
+
+    def formfield(self, **kwargs):
+        return super().formfield(**{
+            'form_class': InvenTreeURLFormField
+        })
diff --git a/InvenTree/InvenTree/settings.py b/InvenTree/InvenTree/settings.py
index f73a5034ca..c3d646c660 100644
--- a/InvenTree/InvenTree/settings.py
+++ b/InvenTree/InvenTree/settings.py
@@ -213,6 +213,14 @@ AUTH_PASSWORD_VALIDATORS = [
     },
 ]
 
+# Extra (optional) URL validators
+# See https://docs.djangoproject.com/en/2.2/ref/validators/#django.core.validators.URLValidator
+
+EXTRA_URL_SCHEMES = CONFIG.get('extra_url_schemes', [])
+
+if not type(EXTRA_URL_SCHEMES) in [list]:
+    eprint("Warning: extra_url_schemes not correctly formatted")
+    EXTRA_URL_SCHEMES = []
 
 # Internationalization
 # https://docs.djangoproject.com/en/1.10/topics/i18n/
diff --git a/InvenTree/InvenTree/validators.py b/InvenTree/InvenTree/validators.py
index 4fbcf44b1c..98c0532d14 100644
--- a/InvenTree/InvenTree/validators.py
+++ b/InvenTree/InvenTree/validators.py
@@ -2,10 +2,29 @@
 Custom field validators for InvenTree
 """
 
+from django.conf import settings
 from django.core.exceptions import ValidationError
 from django.utils.translation import gettext_lazy as _
 
 
+def allowable_url_schemes():
+    """ Return the list of allowable URL schemes.
+    In addition to the default schemes allowed by Django,
+    the install configuration file (config.yaml) can specify
+    extra schemas """
+
+    # Default schemes
+    schemes = ['http', 'https', 'ftp', 'ftps']
+
+    extra = settings.EXTRA_URL_SCHEMES
+
+    for e in extra:
+        if e.lower() not in schemes:
+            schemes.append(e.lower())
+
+    return schemes
+
+
 def validate_part_name(value):
     """ Prevent some illegal characters in part names.
     """
diff --git a/InvenTree/build/migrations/0006_auto_20190913_1407.py b/InvenTree/build/migrations/0006_auto_20190913_1407.py
new file mode 100644
index 0000000000..917d3a4e42
--- /dev/null
+++ b/InvenTree/build/migrations/0006_auto_20190913_1407.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.5 on 2019-09-13 14:07
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('build', '0005_auto_20190604_2217'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='build',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external URL'),
+        ),
+    ]
diff --git a/InvenTree/build/models.py b/InvenTree/build/models.py
index 2ae3f0c5a7..57792340e8 100644
--- a/InvenTree/build/models.py
+++ b/InvenTree/build/models.py
@@ -17,6 +17,7 @@ from django.db.models import Sum
 from django.core.validators import MinValueValidator
 
 from InvenTree.status_codes import BuildStatus
+from InvenTree.fields import InvenTreeURLField
 
 from stock.models import StockItem
 from part.models import Part, BomItem
@@ -89,7 +90,7 @@ class Build(models.Model):
                                      related_name='builds_completed'
                                      )
     
-    URL = models.URLField(blank=True, help_text='Link to external URL')
+    URL = InvenTreeURLField(blank=True, help_text='Link to external URL')
 
     notes = models.TextField(blank=True, help_text='Extra build notes')
     """ Notes attached to each build output """
diff --git a/InvenTree/company/migrations/0008_auto_20190913_1407.py b/InvenTree/company/migrations/0008_auto_20190913_1407.py
new file mode 100644
index 0000000000..d2e23da35f
--- /dev/null
+++ b/InvenTree/company/migrations/0008_auto_20190913_1407.py
@@ -0,0 +1,24 @@
+# Generated by Django 2.2.5 on 2019-09-13 14:07
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('company', '0007_remove_supplierpart_lead_time'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='company',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external company information'),
+        ),
+        migrations.AlterField(
+            model_name='supplierpart',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='URL for external supplier part link'),
+        ),
+    ]
diff --git a/InvenTree/company/models.py b/InvenTree/company/models.py
index 9b974ce793..d1c340921a 100644
--- a/InvenTree/company/models.py
+++ b/InvenTree/company/models.py
@@ -19,6 +19,7 @@ from django.urls import reverse
 from django.conf import settings
 from django.contrib.staticfiles.templatetags.staticfiles import static
 
+from InvenTree.fields import InvenTreeURLField
 from InvenTree.status_codes import OrderStatus
 from common.models import Currency
 
@@ -85,7 +86,7 @@ class Company(models.Model):
     contact = models.CharField(max_length=100,
                                blank=True, help_text='Point of contact')
 
-    URL = models.URLField(blank=True, help_text='Link to external company information')
+    URL = InvenTreeURLField(blank=True, help_text='Link to external company information')
 
     image = models.ImageField(upload_to=rename_company_image, max_length=255, null=True, blank=True)
 
@@ -238,7 +239,7 @@ class SupplierPart(models.Model):
 
     MPN = models.CharField(max_length=100, blank=True, help_text='Manufacturer part number')
 
-    URL = models.URLField(blank=True, help_text='URL for external supplier part link')
+    URL = InvenTreeURLField(blank=True, help_text='URL for external supplier part link')
 
     description = models.CharField(max_length=250, blank=True, help_text='Supplier part description')
 
diff --git a/InvenTree/config_template.yaml b/InvenTree/config_template.yaml
index 1799b49e1a..f362048e35 100644
--- a/InvenTree/config_template.yaml
+++ b/InvenTree/config_template.yaml
@@ -47,7 +47,16 @@ media_root: '../inventree_media'
 # By default it is stored in a directory named 'static' local to the InvenTree directory
 static_root: '../inventree_static'
 
+# Optional URL schemes to allow in URL fields
+# By default, only the following schemes are allowed: ['http', 'https', 'ftp', 'ftps']
+# Uncomment the lines below to allow extra schemes
+#extra_url_schemes:
+#  - mailto
+#  - git
+#  - ssh
+
 # Logging options
+# If debug mode is enabled, set log_queries to True to show aggregate database queries in the debug console
 log_queries: False
 
 # Backup options
diff --git a/InvenTree/part/migrations/0023_auto_20190913_1401.py b/InvenTree/part/migrations/0023_auto_20190913_1401.py
new file mode 100644
index 0000000000..8d5c5992d6
--- /dev/null
+++ b/InvenTree/part/migrations/0023_auto_20190913_1401.py
@@ -0,0 +1,19 @@
+# Generated by Django 2.2.5 on 2019-09-13 14:01
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('part', '0022_auto_20190908_0918'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='part',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to extenal URL'),
+        ),
+    ]
diff --git a/InvenTree/part/models.py b/InvenTree/part/models.py
index f57da3cfdb..76d9f606d0 100644
--- a/InvenTree/part/models.py
+++ b/InvenTree/part/models.py
@@ -34,6 +34,7 @@ import hashlib
 from InvenTree import helpers
 from InvenTree import validators
 from InvenTree.models import InvenTreeTree
+from InvenTree.fields import InvenTreeURLField
 
 from InvenTree.status_codes import BuildStatus, StockStatus, OrderStatus
 
@@ -353,7 +354,7 @@ class Part(models.Model):
 
     revision = models.CharField(max_length=100, blank=True, help_text='Part revision or version number')
 
-    URL = models.URLField(blank=True, help_text='Link to extenal URL')
+    URL = InvenTreeURLField(blank=True, help_text='Link to extenal URL')
 
     image = models.ImageField(upload_to=rename_part_image, max_length=255, null=True, blank=True)
 
diff --git a/InvenTree/stock/migrations/0015_auto_20190913_1407.py b/InvenTree/stock/migrations/0015_auto_20190913_1407.py
new file mode 100644
index 0000000000..de1b49a2a2
--- /dev/null
+++ b/InvenTree/stock/migrations/0015_auto_20190913_1407.py
@@ -0,0 +1,24 @@
+# Generated by Django 2.2.5 on 2019-09-13 14:07
+
+import InvenTree.fields
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('stock', '0014_auto_20190908_0918'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='stockitem',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, max_length=125),
+        ),
+        migrations.AlterField(
+            model_name='stockitemtracking',
+            name='URL',
+            field=InvenTree.fields.InvenTreeURLField(blank=True, help_text='Link to external page for further information'),
+        ),
+    ]
diff --git a/InvenTree/stock/models.py b/InvenTree/stock/models.py
index c659801a0d..272d212cef 100644
--- a/InvenTree/stock/models.py
+++ b/InvenTree/stock/models.py
@@ -23,6 +23,7 @@ from InvenTree import helpers
 
 from InvenTree.status_codes import StockStatus
 from InvenTree.models import InvenTreeTree
+from InvenTree.fields import InvenTreeURLField
 
 from part.models import Part
 
@@ -308,7 +309,7 @@ class StockItem(models.Model):
     serial = models.PositiveIntegerField(blank=True, null=True,
                                          help_text='Serial number for this item')
  
-    URL = models.URLField(max_length=125, blank=True)
+    URL = InvenTreeURLField(max_length=125, blank=True)
 
     batch = models.CharField(max_length=100, blank=True, null=True,
                              help_text='Batch code for this stock item')
@@ -715,7 +716,7 @@ class StockItemTracking(models.Model):
 
     notes = models.CharField(blank=True, max_length=512, help_text='Entry notes')
 
-    URL = models.URLField(blank=True, help_text='Link to external page for further information')
+    URL = InvenTreeURLField(blank=True, help_text='Link to external page for further information')
 
     user = models.ForeignKey(User, on_delete=models.SET_NULL, blank=True, null=True)
 
diff --git a/Makefile b/Makefile
index fc3e4d64e1..ebbd9cafef 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ clean:
 	rm -rf .tox
 	rm -f .coverage
 
-update: backup install migrate
+update: backup install migrate static
 
 # Perform database migrations (after schema changes are made)
 migrate:
@@ -15,6 +15,9 @@ migrate:
 	cd InvenTree && python3 manage.py migrate
 	cd InvenTree && python3 manage.py migrate --run-syncdb
 	cd InvenTree && python3 manage.py check
+
+# Collect static files into the correct locations
+static:
 	cd InvenTree && python3 manage.py collectstatic
 
 # Install all required packages
@@ -64,4 +67,4 @@ backup:
 	cd InvenTree && python3 manage.py dbbackup
 	cd InvenTree && python3 manage.py mediabackup
 
-.PHONY: clean migrate superuser install mysql postgresql style test coverage docreqs docs backup update
\ No newline at end of file
+.PHONY: clean migrate superuser install mysql postgresql static style test coverage docreqs docs backup update
\ No newline at end of file