Housebuilders are continuing to benefit from an improving market, reporting strong performances.Persimmon’s pre-tax profit in 2013 climbed 49% to £330 million against 2012. The volume housebuilder’s legal completions rose 16% to 11,528, driven by a 30% uplift in completions in the second half of the year against the first half.Bovis Homes’ pre-tax profit rose 48% to £78.8 million last year, …