You will need to gain building regulation approval for your conversion, probably need the services of an architect and certainly have to comply with fire regulations at every point in the construction of your loft conversion.
We can arrange all of this for you and keep you informed at every stage.
As we have said above you may not require planning permission, provided the loft conversion is the first extension and does not exceed 40 cubic metres on a terraced property and 50 cubic metres on others and your house is not in a Conservation Area or at the junction of two public highways.