Strangely Government seem much more relaxed when it comes to changing roof materials. Class C permits 'Any other alteration to the roof of a dwellinghouse' and there is no materials condition in this class. So in regard to re-roofing, changing roof materials etc it looks like there is absolute freedom unless the property is in a designated area or has other restrictions applied:
Permitted development
C. Any other alteration to the roof of a dwellinghouse.
Development not permitted C.1 Development is not permitted by Class C if—
(a) permission to use the dwellinghouse as a dwellinghouse has been granted only by virtue of Class M, N, P or Q of Part 3 of this Schedule (changes of use);
(b) the alteration would protrude more than 0.15 metres beyond the plane of the slope of the original roof when measured from the perpendicular with the external surface of the original roof;
(c) it would result in the highest part of the alteration being higher than the highest part of the original roof; or
(d) it would consist of or include— (i) the installation, alteration or replacement of a chimney, flue or soil and vent pipe, or (ii) the installation, alteration or replacement of solar photovoltaics or solar thermal equipment.
Conditions C.2 Development is permitted by Class C subject to the condition that any window located on a roof slope forming a side elevation of the dwellinghouse must be—
(a) obscure-glazed; and
(b) non-opening unless the parts of the window which can be opened are more than 1.7 metres above the floor of the room in which the window is installed.
Porches can be built in whatever you like as well- no materials condition:
Permitted development
D. The erection or construction of a porch outside any external door of a dwellinghouse.
Development not permitted D.1 Development is not permitted by Class D if—
(a) permission to use the dwellinghouse as a dwellinghouse has been granted only by virtue of Class M, N, P or Q of Part 3 of this Schedule (changes of use);
(b) the ground area (measured externally) of the structure would exceed 3 square metres;
(c) any part of the structure would be more than 3 metres above ground level; or
(d) any part of the structure would be within 2 metres of any boundary of the curtilage of the dwellinghouse with a highway.
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