The cost of production has increased so as the cost of equipment, materials, and cost of workmanship in raising a square wall of rooms. Building a house is beneficiary in the long run but let's make a comparison with the amount you will spend to build your desired house and what it will take to rent a house. To be honest, it is easier to afford a house rent of your choice but you can't build that type if you want to build one yourself, it will take years and if one is not financially buoyant to build a house, the two have an advantage they play but building yours has more on the long run, I wouldn't advise anyone to buy a house because there is a probability of using poor materials for construction.
We also need to remember that rent goes up due to inflation as well. If the price of bread goes up, the electricity bill goes up, the apple new iphones are more expensive, the meal you had is higher, and the workers people hire are more expensive, then what would be the case to keep the rent the same price? That's not going to happen.
So if you own a house, you will want the rent to go up as much as the inflation, so if your nation has an inflation of 10%, then the rent you want to take from the people should go up 10%, if you do more than that's bad, if you do less than it's bad for the owner of the house. This is why I doubt it would be fair for anyone if it's anything but the inflation rate.