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Caravan Act, PD & Full Planning Explained

Granny Annexe Planning Permission in
Lancaster

Not every annexe in Lancaster follows the same planning route. A mobile, two-section structure within strict size limits can qualify under the Caravan Sites Act, while a permanent, self-contained living space with its own bedroom and kitchen almost always needs full planning permission. We work out which one your Lancaster project actually is.

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Local to Lancaster
Three Routes Explained
Council-Ready Applications

Granny Annexe Planning Explained For Lancaster

A granny annexe in Lancaster can follow three genuinely different routes. A structure that meets the legal definition of a caravan under the Caravan Sites Act 1968, capable of being moved by road in one or two sections and within maximum dimensions of 20 metres by 6.8 metres with an internal height of 3.05 metres, can often be sited without planning permission provided it remains ancillary to the house.

An outbuilding used incidentally to the enjoyment of the house, a home office, gym, or storage, can fall under Class E permitted development, but the moment it includes genuine sleeping accommodation used independently, it’s no longer considered incidental, and permitted development stops applying.

Where neither route fits, a full planning application is the reality for Lancaster properties, and we confirm this honestly rather than assume. A Lancaster annexe needing full planning permission usually needs both, our Building Regulations drawings in Lancaster service covers the technical compliance side, and our structural calculations in Lancaster service covers the engineering detail.

Right Route Confirmed

Caravan Act, permitted development, or full planning

Caravan Act Route

Movable structures that may need no permission at all

PD Size & Siting

Permitted development limits checked properly

Council-Ready

Applications built to be approved

Granny annexe planning permission

How We Help in Lancaster

Every Lancaster annexe enquiry starts with establishing the real facts, is the structure genuinely mobile within Caravan Act limits, is it staying incidental to the house, or is it a self-contained dwelling, since that shapes the whole route.

From there, we prepare exactly what your Lancaster project needs, whether that’s a Lawful Development Certificate confirming caravan or permitted development status, or a full planning application.

Structural and building regulations input runs alongside the planning process for Lancaster annexe projects, whichever route applies.

Getting The Route Right For Your Lancaster Annexe

We tell Lancaster families honestly whether their annexe genuinely qualifies for the Caravan Act or permitted development routes, rather than defaulting every enquiry to a full application.

Getting the self-containment question right matters more than almost anything else for a Lancaster annexe, and we assess this honestly rather than assume either way.

Structural and building regulations detail is built into every Lancaster annexe project from the start, whichever planning route applies. If you need help with a granny annexe, give us a call on 0330 133 5316 or fill in the form below.

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Common Annexe Planning Questions in Lancaster

What determines if my Lancaster annexe needs planning permission?

This genuinely depends on your specific plans for Lancaster, we check whether the structure is mobile, incidental, or self-contained before advising either way.

What size limits apply to a caravan-style annexe in Lancaster?

The Caravan Sites Act 1968 sets the limits, 20 metres long, 6.8 metres wide, 3.05 metres internal height, and the structure must be moveable by road in one or two sections, we check whether your Lancaster plans genuinely meet this.

What outbuilding rules apply to a Lancaster annexe?

It depends on genuine use, an incidental Lancaster outbuilding can qualify under Class E, but introducing real sleeping accommodation used independently takes it outside permitted development regardless of size.

What makes an annexe a separate dwelling in Lancaster?

Genuine independence is the test in Lancaster, if the annexe could function as a separate home on its own, full planning permission is almost always the realistic route.

Is a Lawful Development Certificate worth it in Lancaster?

Strongly recommended for Lancaster annexes, an assumption that a structure qualifies isn’t the same as formal confirmation, and a Lawful Development Certificate closes that gap.

Can you manage everything for my Lancaster annexe project?

Yes, we coordinate every part of a Lancaster annexe project, from establishing the correct route through to building regulations sign-off, so nothing falls through the gap.