Yes a properly built and nice deck does add some value to a home.
After adding a nice back deck to my home which costed me $3,000.00 for materials since my husband built it I didn't have to pay for a contractor because he's a professional deck builder.
When I did add the deck to my house the house sold for an additional $15,000.00 and the deck made the house value go up and sell for more money and faster as well.
The buyers loved the deck and said that was a decision maker on the house buying that they were looking for a home with a nice deck.
So yes a nice deck added onto a house can increase your property values and make your home sell much faster than a house without a deck.