This sounds like a fine way of doing it. If there aren't too many objects, you could drag-assign all the prefabs into a basic public GameObject[] array in the inspector, and at runtime start, quickly transfer these to a dictionary of the form where the string is taken from the gameobject's name. Eg:

public GameObject[] housePrefabs;
private Dictionary<string,GameObject>houseObjects = new Dictionary<string,GameObject>();

void Start()
{
    foreach (GameObject obj in housePrefabs)
    {
        houseObjects[GameObject.name] = obj;
    }
}

An alternate method might be to define a custom class for your house objects. You might need this if you find that you need more data to accompany the object besides the name itself (such as 'price', 'colourOptions', etc).

In this case, you'd probably still find a Dictionary structure useful, but you might want to have some kind of simple identifier as the key, and your custom object class as the value. The custom object class would then have properties such as "name", "price", "colourOptions", and of course "prefab" which would hold the link to the prefab itself.

If you go this far, you'll probably want to start looking at reading these object-related data from another file such as a text file or xml file.

Hope this helps get you started!

Use Prefab in your Game Here is the tutorial for that . http://lnkd.in/J6ufVr . Here is demo and code for Prefab instantiate so download and try to undestand i hope u will get the solution ..