PPS 7 (Addendum): Residential Extensions and Alterations
Annex A: Context and Design: External Finishes
A20 The external finish of a proposal should aim to complement the type of materials, colour and finish of both the existing building and those of neighbouring properties, particularly where certain materials strongly predominate. Using similar or complementary materials to those of the existing property is more likely to produce a successful extension or alteration. The re-use and recycling of building materials is encouraged and will be especially important when carrying out work to a listed building, or buildings within a conservation area or an area of townscape character.