Stylelint checker can also check SCSS files.

plugin/syntastic.vim

@@ -19,7 +19,7 @@ if has('reltime')
     lockvar! g:_SYNTASTIC_START
 endif
 
-let g:_SYNTASTIC_VERSION = '3.7.0-74'
+let g:_SYNTASTIC_VERSION = '3.7.0-75'
 lockvar g:_SYNTASTIC_VERSION
 
 " Sanity checks {{{1

syntax_checkers/css/stylelint.vim

@@ -19,8 +19,12 @@ let g:loaded_syntastic_css_stylelint_checker = 1
 let s:save_cpo = &cpo
 set cpo&vim
 
+let s:args_after = {
+    \ 'css':  '-f json',
+    \ 'scss': '-f json -s scss' }
+
 function! SyntaxCheckers_css_stylelint_GetLocList() dict
-    let makeprg = self.makeprgBuild({ 'args_after': '-f json' })
+    let makeprg = self.makeprgBuild({ 'args_after': get(s:args_after, self.getFiletype(), '') })
 
     let errorformat = '%t:%f:%l:%c:%m'
 

syntax_checkers/scss/stylelint.vim

@@ -0,0 +1,23 @@
+"============================================================================
+"File:        stylelint.vim
+"Description: Syntax checking plugin for syntastic.vim
+"Maintainer:  LCD 47 <lcd047 at gmail dot com>
+"License:     This program is free software. It comes without any warranty,
+"             to the extent permitted by applicable law. You can redistribute
+"             it and/or modify it under the terms of the Do What The Fuck You
+"             Want To Public License, Version 2, as published by Sam Hocevar.
+"             See http://sam.zoy.org/wtfpl/COPYING for more details.
+"
+"============================================================================
+
+if exists('g:loaded_syntastic_scss_stylelint_checker')
+    finish
+endif
+let g:loaded_syntastic_scss_stylelint_checker = 1
+
+call g:SyntasticRegistry.CreateAndRegisterChecker({
+    \ 'filetype': 'scss',
+    \ 'name': 'stylelint',
+    \ 'redirect': 'css/stylelint'})
+
+" vim: set sw=4 sts=4 et fdm=marker: