Gary Rollins -- Chief Executive Officer
Thank you, Eddie. We're pleased to report our 51st consecutive quarter of improved revenue and earnings. Revenues for the quarter grew 7.2% to $444.6 million compared to $414.7 million for the fourth quarter last year. Net income increased 51.1% to $51 million or $0.16 per diluted share compared to $33.7 million or $0.10 per diluted share for the same quarter of 2017.
Revenues for the full year rose 8.8% to $1.822 billion compared to $1.674 billion for the same period last year. Net income increased 29.3% to approximately $231.7 million, with earnings per diluted share of $0.71 compared to net income of $179.1 million or $0.55 per diluted share for the full-year 2017. We experienced good growth in all of our service lines for the quarter, with residential up 7.8%, commercial pest control rose 5.9%, and termite and ancillary rose 8.2%. 2018 was a good year for Rollins as we continued to build our global presence through acquisitions, both domestically and overseas.
In the U.K., we expanded our footprint with the acquisition of three prime companies: Guardian Pest Control, AMES Group and Kestrel Pest Control. We also achieved an important milestone for the company when we acquired Aardwolf Pestkare. This is Rollins first company-owned operation in Singapore. In the U.S., we acquired OPC Pest Control, a premier pest control company in Kentucky, and we also made small tuck-in acquisitions.
At year-end, we had added a total of 38 companies to our roster. We also continued to expand the Orkin brand internationally with the addition of franchises in South America, Europe and Middle East, Latin America and other locations. The Orkin brand is now represented in 57 countries through our 86 international franchises. As we enter 2019, strategic acquisitions will remain a focus of our growth strategy.
We're extremely pleased to have announced earlier this month our agreement to acquire Clark Pest Control. Headquartered in Lodi California, Clark has operations in over 20 locations in California and Nevada. Founded by Charlie Clark in 1950, the company is growing to be the eighth largest pest control provider in the U.S. Clark recorded revenues of $130 million in 2017.
The company is also growing at a faster rate than we are as well as a faster rate than the overall pest control industry. I first visited with the company over 20 years ago and I was fortunate enough to meet Charlie Clark, an icon in our industry. We have admired the company throughout all of this time. The Clark acquisition will be the largest in our company's history.
Rollins (ROL) Q4 2018 Earnings Conference Call Transcript -- The Motley Fool
