Restrict all traffic except your IP address and more with .htaccess

.htaccess

<IfModule mod_rewrite.c>
    RewriteEngine on
 
    # If the IP address does not match this one
    RewriteCond %{REMOTE_ADDR} !^110.110\.110\.110$
 
    # And they are not accessing a certain subdirectory
    RewriteCond %{REQUEST_URI} !^/admin
 
    # And they are not accessing the development domain
    RewriteCond %{HTTP_HOST} !^development\.example\.com$
 
    # Redirect them to a temporary site
    RewriteRule ^(.*)$ http://www.construction.com [R=302,L]
</IfModule>