The first thing that you need to do is visit the Estate Agent’s office and buy a house from there for 1,000 gold points (gp). The Estate Agents offices can be found in a number of places such as Falador, Varrock, Seers’ Village and East Ardougne.
Next, get yourself some logs. You have two options available to you for getting your hands on the logs. Either chop down the trees, or visit the lumber yard.
Now visit the Sawmill Operator to purchase the basic items for construction, which includes a saw, cloth and nails. He will also agree to convert your logs into planks for a small fee. You will want to pay him the fee to get the planks, as they are not easy to come by and are required in construction.
Purchase a hammer and any other items that you need for construction from the market. You can purchase different types of planks, soft clay, limestone brick, marble blocks, gold leaf, magic stones, steel bars, etc. from the market. Items for sale will vary from market to market. Some items can only be purchased after you have reached a certain level.
Now that you have acquired the raw materials and tools, you are ready to start constructing. Go to “Player Controls” click “House Options” and then select “Build Mode.” You will be transported to the house that you purchased from the Estate Agents office in Step 1. You can start building here.
Click on the ghostly figures in your house. Clicking on them and then selecting “build” will give you a tutorial on building furniture items.