How to Open a Laundromat

Location is everything! find a neighborhood that needs a Laundromat. A good location, such as a spot on a busy street with good visibility and plenty of parking, is a necessity for a business such as this to succeed. Usually lower income neighborhoods with lots of apartment complexes are best.
Contact the city or county department to check on the necessary licenses and permits.
Find out what kind of insurance do you need to run your business.
You will need to apply for a vendors license from the Franchise Tax Board to buy and sell products or snacks in your Laundromat.
Research Laundromats in the area and decide if you want a fully automated Laundromat without an attendant, or a partially automated one that includes additional services such fluff and folding.
Decide whether you want to go on your own ot with a franchise.
Make sure to have a good business plan. You'll need to have all of the aspects of opening and running the business worked out for the short and long term before you make any considerable investment into this venture.
Research your options for financing. Usually, one can finance about 20% of the cost of opening a new Laundromat. But for the most part, the bulk of the investment needs to be in cash. It will require to have at least $100,000 and uip in cash investment generally speaking.
Consider all costs of running the business. From maintenance to wages for employees.
Talk to as many owner operators of existing Laundromats to get an idea and set an expectation for yourself. Ask about the problems they've had, what they would do differently, and whether they are satisfied with their business. Buying an existing business is a lot easier, but usually will be more expensive than starting your own.