Can I build a granny annexe in Harpenden without planning permission?
Not automatically, a mobile structure meeting the Caravan Act’s size and mobility test, or a genuinely incidental outbuilding, can potentially avoid it in Harpenden, but a self-contained annexe with its own facilities used independently usually can’t.
Can my Harpenden annexe qualify as a mobile home?
Yes, potentially, if your Harpenden annexe meets the legal size limits, 20 metres by 6.8 metres by 3.05 metres internal height, and is genuinely capable of being moved by road, it may qualify as a caravan under the 1968 Act.
Does Class E cover a granny annexe in Harpenden?
Class E permitted development in Harpenden covers incidental structures like a home office or gym, subject to height and coverage limits, but not genuine independent living accommodation with its own bedroom, bathroom, and kitchen.
When does my Harpenden annexe need full planning permission?
Once a Harpenden structure functions as independent living space, its own facilities, used separately from the household, it’s no longer incidental, and neither permitted development nor the Caravan Act route typically applies.
Should I get written confirmation for a Harpenden annexe?
Yes, this is genuinely worth having for Harpenden projects, confirming the position in writing protects you if the classification is ever questioned, especially at the point of sale.
Do you coordinate the full annexe process for Harpenden properties?
Absolutely, Harpenden annexe clients get the planning classification and building regulations detail handled together, not as separate, disconnected pieces of work.
