Benchmark operating profit for the 26 weeks to 28 August 2010 was £46.2m, a £2.7m or 6% decline on the comparable period last year.
Homebase said: "Seasonal categories account for more than one-third of sales in the first half of the year. Despite weather conditions being slightly worse across the whole of the summer than the favourable conditions last year, seasonal ranges showed growth.
"The increase in sales was generated by improved ranges of garden furniture and BBQs, new selections of outdoor toys and further improvements to the customer offer across planting and ‘grow your own’."
Internet sales, including the new ‘Reserve & Collect’ service, grew by 40% in the first half of the financial year and now accounts for 4% of sales.