To apply for planning, few hundred varying depending on the county council, to get plans drawn up for the planning again very dependent on how much work needs doing. 15 odd yrs ago I paid 1,500 for plans for an extension to my fathers house, the whole original house has to be drawn out again which adds to the cost rather than just submitting the plan for the extension bit. To build it then who knows these days!
To apply for planning, few hundred varying depending on the county council, to get plans drawn up for the planning again very dependent on how much work needs doing. 15 odd yrs ago I paid 1,500 for plans for an extension to my fathers house, the whole original house has to be drawn out again which adds to the cost rather than just submitting the plan for the extension bit. To build it then who knows these days!