diff --git a/build.py b/build.py
new file mode 100644
index 000000000..be016a30e
--- /dev/null
+++ b/build.py
@@ -0,0 +1,54 @@
+#!/usr/bin/env python
+from __future__ import print_function
+import os
+import sys
+from subprocess import call
+
+
+def x(cmd):
+    print('$ '+cmd)
+    res = call(cmd, shell=True)
+    if res != 0:
+        sys.exit(res)
+
+
+if len(sys.argv) < 2:
+    print('usage: %s <install-mode> [<pip-date>]')
+    sys.exit(1)
+
+
+install_mode = sys.argv[1]
+pip_date = len(sys.argv) > 2 and sys.argv[2]
+
+
+x('pip install -U pip')
+if pip_date:
+    x('python pip-date.py %s pip setuptools wheel six' % pip_date)
+x('pip install -r requirements.txt')
+
+if install_mode == 'pip':
+    x('python setup.py sdist')
+    x('pip install dist/*')
+
+elif install_mode == 'setup-install':
+    x('python setup.py install')
+
+elif install_mode == 'setup-develop':
+    x('python setup.py develop')
+    x('pip install -e .')
+
+x('pip install pytest')
+x('pip list')
+
+if not os.path.exists('tmp'):
+    os.mkdir('tmp')
+
+try:
+    old = os.getcwd()
+    os.chdir('tmp')
+
+    x('python -m spacy.en.download')
+    x('python -m pytest ../spacy/ -x --models --vectors --slow')
+
+finally:
+    os.chdir(old)
diff --git a/build.sh b/build.sh
deleted file mode 100755
index 1fe9256a2..000000000
--- a/build.sh
+++ /dev/null
@@ -1,39 +0,0 @@
-#!/bin/bash -x
-set -e
-
-if [[ $# < 2 ]]; then
-    echo "usage: $0 <python-path> <install-mode> [<pip-date>]"
-    exit
-fi
-
-if [ ! -d ".build" ]; then
-    virtualenv .build --python $1
-fi
-. .build/bin/activate
-
-# install
-pip install -U pip
-
-if [ -n "${3+1}" ]; then
-    python pip-date.py $3 pip setuptools wheel six
-fi
-
-pip install -r requirements.txt
-if [[ "$2" == "pip" ]]; then
-  python setup.py sdist;
-  pip install dist/*;
-fi
-if [[ "$2" == "setup-install" ]]; then
-  python setup.py install;
-fi
-if [[ "$2" == "setup-develop" ]]; then
-  python setup.py develop;
-  pip install -e .;
-fi
-pip install pytest
-pip list
-
-# script
-cd .build
-python -m spacy.en.download
-python -m pytest ../spacy/ -x --models --vectors --slow
diff --git a/venv.ps1 b/venv.ps1
new file mode 100644
index 000000000..7ca6fb6bb
--- /dev/null
+++ b/venv.ps1
@@ -0,0 +1,13 @@
+param (
+    [string]$python = $(throw "-python is required."),
+    [string]$install_mode = $(throw "-install_mode is required."),
+    [string]$pip_date
+)
+ 
+if(!(Test-Path -Path ".build"))
+{
+    virtualenv .build --python $python
+}
+.build\Scripts\activate.ps1
+
+python build.py $python $install_mode $pip_date
diff --git a/venv.sh b/venv.sh
new file mode 100755
index 000000000..832d90b43
--- /dev/null
+++ b/venv.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+
+if [ ! -d ".build" ]; then
+    virtualenv .build --python $1
+fi
+
+. .build/bin/activate
+python build.py $2 $3