No the £300k includes the roof (its a specific tile set by planning so had no choice). Also this price includes windows and 3 bifold doors (all wooden again a planning condition). The windows and roof add up to approx £100k. Stairs to be fitted by others is £6.5k . The rest is the cost for the foundations, timber frame , its erection, insulation and some items as part of the package which will be fitted by others. We still have exterior cladding/render and all internal kit out to complete on top of this price.