Asking family and friends if they have done any recent building work is a good place to start. Ask them if they would recommend any builders. Ask to see the examples of work done by your builder. It is possible that what your friend or relative considers good workmanship might not match your expectations.
Be polite, take the number of the builder and don't call them. This will avoid any friction and unnecessary arguments. As we all have different standards, you must inspect the work that is being recommended to you. If the work is satisfactory, ask the person who recommended it to find out if they had any complaints. It is important to verify the contractor's credentials. You can also check online. You can hire a general building contractor in Washington at https://sandowconstruction.com/.
You can also search the telephone book or business directory. You will find most tradespeople advertising in the advertisement section of local newspapers. You might find a similar board at your local hardware or builders merchants. There are many websites that offer different services for finding good tradespeople.
You should not trust just the recommendations made by people on these websites. We all have our own standards. Websites for actual building companies can also be found on the internet. You must ensure that the company you are considering hiring is reliable.