(ShareCast News) - Retirement homebuilder McCarthy and Stone said the UK's exit from the EU may have an impact on the timing and cost of the conversion of its order book of reservations into completions."Notwithstanding any short term market impact of last week's referendum result, the business remains in good shape to deliver on its medium term strategy," the company said."The group would expect the current order book of forward sales to be sufficient, in normal market conditions, to deliver its targeted 20% increase in sales volumes over the full year."The company said it now had enough sites in build to deliver its 2017 targeted sales and sufficient land under to deliver on its objective of building and selling more than 3,000 specialist retirement homes in 2019, although it would continue to review investment plans and monitor housing market developments following the referendum result.It added that in the first 43 weeks of this year, the group had released 58 new sales outlets (totalling 2,137 units), contributing to a 18% increase in weekly net reservation rate above the same period in 2015 and supporting a 23% increase in the order book of forward sales at 24 June 2016 to around £426m."The group now holds all of the reservations it needs to deliver full year completions in line with market expectations," the company said.