Is this the Dumas kit?
If so this is a splendid looking model and the pics on the above link do show doors with hinges. You can buy model doll house hinge fittings at small sizes and I have fitted on some of my models. My supply was the local model shop, sadly now gone but I'm sure there are suppliers on line.
If you have good eyesight you could fabricate from brass shim and wire and some jewellery round nose pliers. Very fiddley but also rewarding. Hope you find a supply if you build opening doors to show the interior, always worthwhile in my opinion.