Once anyone who needed a tradesman had to pick up the phone book to find one, and then we were never sure of the quality of their work. These days most tradesmen have an online presence and we can be nearly always sure that those who have gone to the trouble of getting a website are some of the best. A website costs time and money to get and maintain, so those who have one must be getting plenty of work meaning that they do quality work.
This is not necessarily always the case, but you are more likely to find a good builder or plumber online. When doing your online research for builders or plumbers you still do need to be careful to choose correctly. You will still need to get quotes and be sure what each quote includes and the quality of the goods such as timber and tiles that are in the quote.
You also need to be sure that there is a landline phone number as well as a mobile phone number, an address, and of course an email address. A good tradesman will ensure that he is available to answer your calls or emails as soon as possible. While he may be out on the job through the day, you should be able to expect him to answer email within 24 hours. Phone calls should be returned within a couple of hours in they are not answered immediately.
Just be aware that when you are searching for a tradesman online you will want one relatively close to where you live to save on the added costs of travel. Therefore you will need to use your nearest big town or city for your keyword search as well as the keyword of plumber or builder.
Otherwise you could inadvertently contact a tradesman in another city and that would be a waste of time both yours and his.