The Cottage Smallholder

Ok guys i know i post on here a lot, but you all give such good advice and i dont know anyone else with chickens to ask! My 2 girls have small run and hut at the bottom of the garden. Inside their 'indoor' bit i just put straw down on the floor (it is raised up above the run accessed by a ramp) It is pretty small in there compared to their outdoor area. What exactly should be in the 'indoor' area? As they have never laid yet and are about 10/11 months old im wondering if im doing something wrong. I know bigger hen houses have nest boxes and perchs but as ive only got 2, is straw on the floor enough? It is triangle shaped so i dont think there would be room to fit in nest boxes. Is there anything else i can do to encourage them to lay? Is there such a thing as hens that DONT lay??? Am i unlucky enough to have got 2? I know the answer is to wait and see but how long should i wait as they are getting on a year old! They are a fair old size now and look the part..... just dont seem upto the job!