"in addition to" is correct and usable in written English.
You can use it to introduce a second element that is related to the subject being discussed. For example: In addition to regular maintenance, we need to check the brakes for wear and tear.
For example, a call from a United States mobile phone to a landline in Belgium would be billed at 2 cents a minute (in addition to normal minutes used).
The charges are in addition to normal calling tariffs.
Roaming charges are levied in addition to normal long-distance calling charges and value-added taxes.
Adventitious sounds are those heard in addition to normal breathing sounds and include crackles, wheezes, and rubs.
In addition to normal trips Trump may decide to take into New York, his wife Melania and 10-year-old son Barron now expect to live in New York at least temporarily.
Any of the low-cost airlines will charge extra to carry sporting equipment, in addition to normal check-in baggage charges.
A portfolio is the main necessity to showcase artistic ability, in addition to normal UCAS entry requirements which range depending on the university.
Various genera and individual species are known to reproduce by apomixis (the setting of seed without fertilization), either completely or in addition to normal sexual means.
Some of the languages once had, in addition to normal speech, a set of special registers (speech styles with distinctive vocabulary).
The finances were in the hands of the provincial procurator, an independent official of equestrian status whose staff supervised imperial domains and the revenues of mines in addition to normal taxation.
A group of 156 patients with chronic lower back pain were assigned to have the 75-minute yoga classes in north and west London, Manchester, York and Truro, in addition to normal GP care, while a control group of 157 just saw their GPs.
