British housebuilder Persimmon is reportedly considering a £1bn takeover bid for Cala Group, a rival company in the sector that is up for sale. According to sources, Persimmon, which has a market value of £4.74bn, is likely to submit an offer for Cala before the bid deadline next week. Cala, which is being auctioned by Legal & General (L&G), is expected to have a price tag of approximately £1bn.