We are planning some building work / reconfiguring of our house. We are knocking the wall down between the kitchen and dining room and extending a little to the back (2.5m) this will open onto the garden with glass doors. We will also extend to the side to create a new utility (no more than 2m), the house will be under 9m wide; a total of approx 23sqm extension. There will be a bit of knocking down to achieve a straight line at the back as the utility juts out from the kitchen and the kitchen goes out further than the bay window in the dining room. We are within permitted development, so no planning permission required. We are then creating a WC and separate store room to the back of the kitchen off the hall, so some walls are to be built. We pretty much know what we want to achieve. We have been quoted £2500 for initial plans and survey to include drawings of elevation / cross sections plus another £2500 for build reg drawings. I have declined extra services eg tendering process, schedule of works as this adds another £2,500. Do these prices sound reasonable?