Our neighbour's extension is going ahead and we're considering a right to light claim. We've had two quotes for a survey: £1,800 and £4,200. Both claim to be doing the same thing (BRE methodology, 3D modelling, expert report).
Why is there such a huge difference? Is the cheaper one likely cutting corners, or is the expensive one just overcharging?
Also, at what point do we actually need to commission this? Before the application is decided, or can we wait to see if it's approved?