There are a number of options to get to Baan Dam. If you don’t have your own transport you could book a trip from any Chiang Rai tour office. Price will vary depending on whether you want to visit as a shared or private tour. Shared tours often combine the Black House with a visit to the White Temple (Wat Rong Khun) but your time at each may be limited so if you don’t want to be rushed, either arrange a private tour or organize your own transport. The cost of a tuk-tuk from Chiang Rai to the Black House will vary depending on your negotiating skills, but expect to pay at least 300 Baht return. You can also organize a taxi-meter or if you want to combine it with a trip to other attractions in and around Chiang Rai, hire a car with a driver for the day. If I was with friends or family, I would choose the option of hiring a car with driver or use a taxi-meter.