August Media won the Launch of the Year and The Grand Prix awards for its title, Completely London, which it produces for the London estate agent Kinleigh Folkard & Hayward.
It also won Best Use of Photography and Editor of the Year for the same title.
Commending August Media on its Grand Prix award, the judges said: "Completely London has it all - brave editorial, brilliant design and stunning photography".
The publisher also won the award for Best Annual Report for its City & Guilds Annual Report 2010.
In addition, August Media's Donna Hardie won Editor of the Year for her work across both the Completely London and Butlins Weekender magazines.
Mark Lonergan, managing director of August Media, said: "We are five years old, so what better way to celebrate our fifth year? We have a great client and a great brief that allowed us to challenge all conventions and understand that really high-quality content can make profound changes to an experience of a brand".
Lonergan said: "Magazines are all about that cosy, one-to-one experience and, for us, customer publications are all about activating the audience to do something."
Northstar, which publishes Audi Magazine, won the award for Best Automative title at the awards, which were held in Old Billingsgate. The judges commended Northstar and said: "The team have clearly understood the Audi driver and what they want from the brand".
British Airways magazine High Life, published by Cedar Communications, won Best Travel and Leisure title. The judges described it as being "still the daddy of customer mags".
Toni&Guy magazine won the title for Best Consumer Publication (retail), which is published by Fitzgerald Shurey Tarbuck (FST). John Brown Media's title, John Lewis Edition, was highly commended in this category.
River Publishing won the award for Best Consumer Publication (non-retail) and Forward publishing won the award of Best Consumer Publication (membership) for Tescos’ Tesco Baby & Toddler Club.
The APA launched the International Customer Publishing Awards last year, under the theme, "Do you love editorial?", replacing the APA's formerly separate Effectiveness Awards and Creative Awards.
The full list of winners can be found at the APA website.