PPS 21 Sustainable Development in the Countryside·Page 18
Dwellings and Travellers Accommodation in the Countryside
Extensions to dwelling houses and travellers accommodation may be permitted in the countryside when they comply with specified policies.
• an extension to a dwelling house where this is in accordance with the Addendum to PPS 7; or
• Travellers Accommodation where this is in accordance with Policy HS 3 of PPS 12.
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/PPS 21 - Sustainable Development in the Countryside.pdf