A beautified, commented boilerplate for creating JSON-LD Schema mark-up for a local business. Within the example I'm using my friend's real business, a local plumber in Rugby. When using, review and remove the comments.

local-business-JSON-LD.js

<script type="application/ld+json">
	// A simple, single location local business JSON-LD Schema Boilerplate
	// By @bavington, available on GitHub: http://bit.ly/Local_JSON
	{
	  	"@context":"http://schema.org",
	  	"@type":"Plumber", // Change to the most specific type (List of choices: https://goo.gl/tvMVHf)
	    "name":"Custom Heat", // *REQUIRED
	    "legalName":"Custom Heat Ltd", // The Registered Business Name
	    "vatID":"776796257",
	    "description":"Established in Rugby since 1980, Custom Heat are a family run central heating and plumbing business serving Rugby, Royal Leamington Spa and Warwick.",
	    "logo":"http://www.customheat.co.uk/wp-content/themes/custom-heat/images/custom-heat-logo.png",

	    "address":{ // *REQUIRED
	      "@type":"PostalAddress",
	      "streetAddress":"164 Lawford Road", // *REQUIRED
	      "addressLocality":"Rugby", // *REQUIRED
	      "addressRegion":"Warwickshire", // *REQUIRED
	      "postalCode":"CV21 2HL", // *REQUIRED
	      "addressCountry":"GB" // *REQUIRED
	    },

	    //Optional Link to your business on Google Maps
	    "hasMap": "https://www.google.co.uk/maps/place/Custom+Heat+Ltd/@52.3726132,-1.2765811,17z/data=!3m1!4b1!4m5!3m4!1s0x4877474b2cff86d7:0xbec0dd5d55581bec!8m2!3d52.3726132!4d-1.2743924",

	    "geo":{ // recommended.
	      "@type":"GeoCoordinates",
	      "latitude":52.372613, 
	      "longitude":-1.274392
	    },

	    "url":"http://www.customheat.co.uk", // recommended.
	    "telephone":"+441788568752", // Recommended - The number must include the Country Code.
	    "email":"mailto:sales@customheat.co.uk", // Optional sales email address

	    "openingHoursSpecification":[  // recommended.
	      {
	        "@type":"OpeningHoursSpecification", //Standard Opening Hours
	        "dayOfWeek":[
	          "Monday",
	          "Tuesday",
	          "Wednesday",
	          "Thursday",
	          "Friday"
	        ],
	        "opens":"09:30",
	        "closes":"18:00"
	      },
	      {
	        "@type":"OpeningHoursSpecification", //Open 24hrs Saturday
	        "dayOfWeek":"Saturday",
	        "opens":"00:00",
	        "closes":"23:59"
	      },
	      {
	        "@type":"OpeningHoursSpecification", //Closed all day Sunday
	        "dayOfWeek":"Sunday",
	        "opens":"00:00",
	        "closes":"00:00"
	      }
	    ],
	  	"sameAs":[ // All Social Accounts
	      "http://www.facebook.com/customheatltd",
	      "http://www.twitter.com/customheat"
	    ]
	}
</script>