Sand blasting

Can anyone recommend a company to quote to sand blast and paint fixed metal grills please

There is a company on the right before you get to Los Montesinos opposite the Garage, I think it's called Artica Metalica. They have a workshop at the back where they do everything you want.

do you know if they do the work on site

I doubt that anyone will do sandblasting at your property It would damage anything near the grills. It is in any case better to have them powder coated which lasts a lot longer. Both things can only be done with the grills removed which they should be able to do for you.

Get them galvanised first last longer well worth the cost